Removed openssl, and curl, and added mbedded tls.curl-removal

Almost fully removed curl, needs more testing.

Fixed most issues, now trying to cross compile.

Fix?

Sigh.

15 files changed, 12890 insertions, 0 deletions

diff --git a/lib/mbedtls-2.27.0/programs/ssl/CMakeLists.txt b/lib/mbedtls-2.27.0/programs/ssl/CMakeLists.txt
new file mode 100644
index 0000000..dfc16a5
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/CMakeLists.txt
@@ -0,0 +1,54 @@
+set(THREADS_USE_PTHREADS_WIN32 true)
+find_package(Threads)
+
+set(libs
+    ${mbedtls_target}
+)
+
+if(USE_PKCS11_HELPER_LIBRARY)
+    set(libs ${libs} pkcs11-helper)
+endif(USE_PKCS11_HELPER_LIBRARY)
+
+if(ENABLE_ZLIB_SUPPORT)
+    set(libs ${libs} ${ZLIB_LIBRARIES})
+endif(ENABLE_ZLIB_SUPPORT)
+
+set(executables
+    dtls_client
+    dtls_server
+    mini_client
+    ssl_client1
+    ssl_client2
+    ssl_context_info
+    ssl_fork_server
+    ssl_mail_client
+    ssl_server
+    ssl_server2
+)
+
+foreach(exe IN LISTS executables)
+    set(extra_sources "")
+    if(exe STREQUAL "ssl_client2" OR exe STREQUAL "ssl_server2")
+        list(APPEND extra_sources
+            ${CMAKE_CURRENT_SOURCE_DIR}/../test/query_config.c)
+    endif()
+    add_executable(${exe} ${exe}.c $<TARGET_OBJECTS:mbedtls_test>
+        ${extra_sources})
+    target_link_libraries(${exe} ${libs})
+    target_include_directories(${exe} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../../tests/include)
+endforeach()
+
+set_property(TARGET ssl_client2 APPEND PROPERTY SOURCES
+    ssl_test_lib.c ${CMAKE_CURRENT_SOURCE_DIR}/../test/query_config.c)
+set_property(TARGET ssl_server2 APPEND PROPERTY SOURCES
+    ssl_test_lib.c ${CMAKE_CURRENT_SOURCE_DIR}/../test/query_config.c)
+
+if(THREADS_FOUND)
+    add_executable(ssl_pthread_server ssl_pthread_server.c $<TARGET_OBJECTS:mbedtls_test>)
+    target_link_libraries(ssl_pthread_server ${libs} ${CMAKE_THREAD_LIBS_INIT})
+    list(APPEND executables ssl_pthread_server)
+endif(THREADS_FOUND)
+
+install(TARGETS ${executables}
+        DESTINATION "bin"
+        PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
diff --git a/lib/mbedtls-2.27.0/programs/ssl/dtls_client.c b/lib/mbedtls-2.27.0/programs/ssl/dtls_client.c
new file mode 100644
index 0000000..8c302a0
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/dtls_client.c
@@ -0,0 +1,363 @@
+/*
+ *  Simple DTLS client demonstration program
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_printf     printf
+#define mbedtls_fprintf    fprintf
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif
+
+#if !defined(MBEDTLS_SSL_CLI_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) ||    \
+    !defined(MBEDTLS_NET_C)  || !defined(MBEDTLS_TIMING_C) ||             \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) ||        \
+    !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_RSA_C) ||      \
+    !defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C)
+int main( void )
+{
+    mbedtls_printf( "MBEDTLS_SSL_CLI_C and/or MBEDTLS_SSL_PROTO_DTLS and/or "
+            "MBEDTLS_NET_C and/or MBEDTLS_TIMING_C and/or "
+            "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
+            "MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_RSA_C and/or "
+            "MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined.\n" );
+    mbedtls_exit( 0 );
+}
+#else
+
+#include <string.h>
+
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/debug.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/error.h"
+#include "mbedtls/certs.h"
+#include "mbedtls/timing.h"
+
+/* Uncomment out the following line to default to IPv4 and disable IPv6 */
+//#define FORCE_IPV4
+
+#define SERVER_PORT "4433"
+#define SERVER_NAME "localhost"
+
+#ifdef FORCE_IPV4
+#define SERVER_ADDR "127.0.0.1"     /* Forces IPv4 */
+#else
+#define SERVER_ADDR "::1"
+#endif
+
+#define MESSAGE     "Echo this"
+
+#define READ_TIMEOUT_MS 1000
+#define MAX_RETRY       5
+
+#define DEBUG_LEVEL 0
+
+
+static void my_debug( void *ctx, int level,
+                      const char *file, int line,
+                      const char *str )
+{
+    ((void) level);
+
+    mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
+    fflush(  (FILE *) ctx  );
+}
+
+int main( int argc, char *argv[] )
+{
+    int ret, len;
+    mbedtls_net_context server_fd;
+    uint32_t flags;
+    unsigned char buf[1024];
+    const char *pers = "dtls_client";
+    int retry_left = MAX_RETRY;
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_x509_crt cacert;
+    mbedtls_timing_delay_context timer;
+
+    ((void) argc);
+    ((void) argv);
+
+#if defined(MBEDTLS_DEBUG_C)
+    mbedtls_debug_set_threshold( DEBUG_LEVEL );
+#endif
+
+    /*
+     * 0. Initialize the RNG and the session data
+     */
+    mbedtls_net_init( &server_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    mbedtls_x509_crt_init( &cacert );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    mbedtls_printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    mbedtls_entropy_init( &entropy );
+    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
+                               (const unsigned char *) pers,
+                               strlen( pers ) ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 0. Load certificates
+     */
+    mbedtls_printf( "  . Loading the CA root certificate ..." );
+    fflush( stdout );
+
+    ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
+                          mbedtls_test_cas_pem_len );
+    if( ret < 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok (%d skipped)\n", ret );
+
+    /*
+     * 1. Start the connection
+     */
+    mbedtls_printf( "  . Connecting to udp/%s/%s...", SERVER_NAME, SERVER_PORT );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_connect( &server_fd, SERVER_ADDR,
+                                         SERVER_PORT, MBEDTLS_NET_PROTO_UDP ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_connect returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 2. Setup stuff
+     */
+    mbedtls_printf( "  . Setting up the DTLS structure..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                   MBEDTLS_SSL_IS_CLIENT,
+                   MBEDTLS_SSL_TRANSPORT_DATAGRAM,
+                   MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /* OPTIONAL is usually a bad choice for security, but makes interop easier
+     * in this simplified example, in which the ca chain is hardcoded.
+     * Production code should set a proper ca chain and use REQUIRED. */
+    mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
+    mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
+    mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+    mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+    mbedtls_ssl_conf_read_timeout( &conf, READ_TIMEOUT_MS );
+
+    if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_ssl_set_hostname( &ssl, SERVER_NAME ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_set_bio( &ssl, &server_fd,
+                         mbedtls_net_send, mbedtls_net_recv, mbedtls_net_recv_timeout );
+
+    mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
+                                            mbedtls_timing_get_delay );
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 4. Handshake
+     */
+    mbedtls_printf( "  . Performing the DTLS handshake..." );
+    fflush( stdout );
+
+    do ret = mbedtls_ssl_handshake( &ssl );
+    while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+           ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 5. Verify the server certificate
+     */
+    mbedtls_printf( "  . Verifying peer X.509 certificate..." );
+
+    /* In real life, we would have used MBEDTLS_SSL_VERIFY_REQUIRED so that the
+     * handshake would not succeed if the peer's cert is bad.  Even if we used
+     * MBEDTLS_SSL_VERIFY_OPTIONAL, we would bail out here if ret != 0 */
+    if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
+    {
+        char vrfy_buf[512];
+
+        mbedtls_printf( " failed\n" );
+
+        mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), "  ! ", flags );
+
+        mbedtls_printf( "%s\n", vrfy_buf );
+    }
+    else
+        mbedtls_printf( " ok\n" );
+
+    /*
+     * 6. Write the echo request
+     */
+send_request:
+    mbedtls_printf( "  > Write to server:" );
+    fflush( stdout );
+
+    len = sizeof( MESSAGE ) - 1;
+
+    do ret = mbedtls_ssl_write( &ssl, (unsigned char *) MESSAGE, len );
+    while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+           ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+
+    if( ret < 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n", ret );
+        goto exit;
+    }
+
+    len = ret;
+    mbedtls_printf( " %d bytes written\n\n%s\n\n", len, MESSAGE );
+
+    /*
+     * 7. Read the echo response
+     */
+    mbedtls_printf( "  < Read from server:" );
+    fflush( stdout );
+
+    len = sizeof( buf ) - 1;
+    memset( buf, 0, sizeof( buf ) );
+
+    do ret = mbedtls_ssl_read( &ssl, buf, len );
+    while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+           ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+
+    if( ret <= 0 )
+    {
+        switch( ret )
+        {
+            case MBEDTLS_ERR_SSL_TIMEOUT:
+                mbedtls_printf( " timeout\n\n" );
+                if( retry_left-- > 0 )
+                    goto send_request;
+                goto exit;
+
+            case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                mbedtls_printf( " connection was closed gracefully\n" );
+                ret = 0;
+                goto close_notify;
+
+            default:
+                mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n\n", (unsigned int) -ret );
+                goto exit;
+        }
+    }
+
+    len = ret;
+    mbedtls_printf( " %d bytes read\n\n%s\n\n", len, buf );
+
+    /*
+     * 8. Done, cleanly close the connection
+     */
+close_notify:
+    mbedtls_printf( "  . Closing the connection..." );
+
+    /* No error checking, the connection might be closed already */
+    do ret = mbedtls_ssl_close_notify( &ssl );
+    while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+    ret = 0;
+
+    mbedtls_printf( " done\n" );
+
+    /*
+     * 9. Final clean-ups and exit
+     */
+exit:
+
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf( "Last error was: %d - %s\n\n", ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( &server_fd );
+
+    mbedtls_x509_crt_free( &cacert );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+#if defined(_WIN32)
+    mbedtls_printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    /* Shell can not handle large exit numbers -> 1 for errors */
+    if( ret < 0 )
+        ret = 1;
+
+    mbedtls_exit( ret );
+}
+#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_PROTO_DTLS && MBEDTLS_NET_C &&
+          MBEDTLD_TIMING_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
+          MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_RSA_C && MBEDTLS_CERTS_C &&
+          MBEDTLS_PEM_PARSE_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/dtls_server.c b/lib/mbedtls-2.27.0/programs/ssl/dtls_server.c
new file mode 100644
index 0000000..5f71ec9
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/dtls_server.c
@@ -0,0 +1,438 @@
+/*
+ *  Simple DTLS server demonstration program
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_printf     printf
+#define mbedtls_fprintf    fprintf
+#define mbedtls_time_t     time_t
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif
+
+/* Uncomment out the following line to default to IPv4 and disable IPv6 */
+//#define FORCE_IPV4
+
+#ifdef FORCE_IPV4
+#define BIND_IP     "0.0.0.0"     /* Forces IPv4 */
+#else
+#define BIND_IP     "::"
+#endif
+
+#if !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) ||    \
+    !defined(MBEDTLS_SSL_COOKIE_C) || !defined(MBEDTLS_NET_C) ||          \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) ||        \
+    !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_RSA_C) ||      \
+    !defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C) ||         \
+    !defined(MBEDTLS_TIMING_C)
+
+int main( void )
+{
+    printf( "MBEDTLS_SSL_SRV_C and/or MBEDTLS_SSL_PROTO_DTLS and/or "
+            "MBEDTLS_SSL_COOKIE_C and/or MBEDTLS_NET_C and/or "
+            "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
+            "MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_RSA_C and/or "
+            "MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C and/or "
+            "MBEDTLS_TIMING_C not defined.\n" );
+    mbedtls_exit( 0 );
+}
+#else
+
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/certs.h"
+#include "mbedtls/x509.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/ssl_cookie.h"
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/error.h"
+#include "mbedtls/debug.h"
+#include "mbedtls/timing.h"
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+#include "mbedtls/ssl_cache.h"
+#endif
+
+#define READ_TIMEOUT_MS 10000   /* 10 seconds */
+#define DEBUG_LEVEL 0
+
+
+static void my_debug( void *ctx, int level,
+                      const char *file, int line,
+                      const char *str )
+{
+    ((void) level);
+
+    mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
+    fflush(  (FILE *) ctx  );
+}
+
+int main( void )
+{
+    int ret, len;
+    mbedtls_net_context listen_fd, client_fd;
+    unsigned char buf[1024];
+    const char *pers = "dtls_server";
+    unsigned char client_ip[16] = { 0 };
+    size_t cliip_len;
+    mbedtls_ssl_cookie_ctx cookie_ctx;
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_x509_crt srvcert;
+    mbedtls_pk_context pkey;
+    mbedtls_timing_delay_context timer;
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_context cache;
+#endif
+
+    mbedtls_net_init( &listen_fd );
+    mbedtls_net_init( &client_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    mbedtls_ssl_cookie_init( &cookie_ctx );
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_init( &cache );
+#endif
+    mbedtls_x509_crt_init( &srvcert );
+    mbedtls_pk_init( &pkey );
+    mbedtls_entropy_init( &entropy );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+#if defined(MBEDTLS_DEBUG_C)
+    mbedtls_debug_set_threshold( DEBUG_LEVEL );
+#endif
+
+    /*
+     * 1. Load the certificates and private RSA key
+     */
+    printf( "\n  . Loading the server cert. and key..." );
+    fflush( stdout );
+
+    /*
+     * This demonstration program uses embedded test certificates.
+     * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
+     * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
+     */
+    ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
+                          mbedtls_test_srv_crt_len );
+    if( ret != 0 )
+    {
+        printf( " failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
+                          mbedtls_test_cas_pem_len );
+    if( ret != 0 )
+    {
+        printf( " failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+    ret =  mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
+                         mbedtls_test_srv_key_len, NULL, 0 );
+    if( ret != 0 )
+    {
+        printf( " failed\n  !  mbedtls_pk_parse_key returned %d\n\n", ret );
+        goto exit;
+    }
+
+    printf( " ok\n" );
+
+    /*
+     * 2. Setup the "listening" UDP socket
+     */
+    printf( "  . Bind on udp/*/4433 ..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_bind( &listen_fd, BIND_IP, "4433", MBEDTLS_NET_PROTO_UDP ) ) != 0 )
+    {
+        printf( " failed\n  ! mbedtls_net_bind returned %d\n\n", ret );
+        goto exit;
+    }
+
+    printf( " ok\n" );
+
+    /*
+     * 3. Seed the RNG
+     */
+    printf( "  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
+                               (const unsigned char *) pers,
+                               strlen( pers ) ) ) != 0 )
+    {
+        printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
+        goto exit;
+    }
+
+    printf( " ok\n" );
+
+    /*
+     * 4. Setup stuff
+     */
+    printf( "  . Setting up the DTLS data..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                    MBEDTLS_SSL_IS_SERVER,
+                    MBEDTLS_SSL_TRANSPORT_DATAGRAM,
+                    MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+    mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+    mbedtls_ssl_conf_read_timeout( &conf, READ_TIMEOUT_MS );
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_conf_session_cache( &conf, &cache,
+                                   mbedtls_ssl_cache_get,
+                                   mbedtls_ssl_cache_set );
+#endif
+
+    mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
+   if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
+    {
+        printf( " failed\n  ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_ssl_cookie_setup( &cookie_ctx,
+                                  mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        printf( " failed\n  ! mbedtls_ssl_cookie_setup returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_conf_dtls_cookies( &conf, mbedtls_ssl_cookie_write, mbedtls_ssl_cookie_check,
+                               &cookie_ctx );
+
+    if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+    {
+        printf( " failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
+                                            mbedtls_timing_get_delay );
+
+    printf( " ok\n" );
+
+reset:
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        printf("Last error was: %d - %s\n\n", ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( &client_fd );
+
+    mbedtls_ssl_session_reset( &ssl );
+
+    /*
+     * 3. Wait until a client connects
+     */
+    printf( "  . Waiting for a remote connection ..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
+                    client_ip, sizeof( client_ip ), &cliip_len ) ) != 0 )
+    {
+        printf( " failed\n  ! mbedtls_net_accept returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /* For HelloVerifyRequest cookies */
+    if( ( ret = mbedtls_ssl_set_client_transport_id( &ssl,
+                    client_ip, cliip_len ) ) != 0 )
+    {
+        printf( " failed\n  ! "
+                "mbedtls_ssl_set_client_transport_id() returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_set_bio( &ssl, &client_fd,
+                         mbedtls_net_send, mbedtls_net_recv, mbedtls_net_recv_timeout );
+
+    printf( " ok\n" );
+
+    /*
+     * 5. Handshake
+     */
+    printf( "  . Performing the DTLS handshake..." );
+    fflush( stdout );
+
+    do ret = mbedtls_ssl_handshake( &ssl );
+    while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+           ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+
+    if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED )
+    {
+        printf( " hello verification requested\n" );
+        ret = 0;
+        goto reset;
+    }
+    else if( ret != 0 )
+    {
+        printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int) -ret );
+        goto reset;
+    }
+
+    printf( " ok\n" );
+
+    /*
+     * 6. Read the echo Request
+     */
+    printf( "  < Read from client:" );
+    fflush( stdout );
+
+    len = sizeof( buf ) - 1;
+    memset( buf, 0, sizeof( buf ) );
+
+    do ret = mbedtls_ssl_read( &ssl, buf, len );
+    while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+           ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+
+    if( ret <= 0 )
+    {
+        switch( ret )
+        {
+            case MBEDTLS_ERR_SSL_TIMEOUT:
+                printf( " timeout\n\n" );
+                goto reset;
+
+            case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                printf( " connection was closed gracefully\n" );
+                ret = 0;
+                goto close_notify;
+
+            default:
+                printf( " mbedtls_ssl_read returned -0x%x\n\n", (unsigned int) -ret );
+                goto reset;
+        }
+    }
+
+    len = ret;
+    printf( " %d bytes read\n\n%s\n\n", len, buf );
+
+    /*
+     * 7. Write the 200 Response
+     */
+    printf( "  > Write to client:" );
+    fflush( stdout );
+
+    do ret = mbedtls_ssl_write( &ssl, buf, len );
+    while( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+           ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+
+    if( ret < 0 )
+    {
+        printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n", ret );
+        goto exit;
+    }
+
+    len = ret;
+    printf( " %d bytes written\n\n%s\n\n", len, buf );
+
+    /*
+     * 8. Done, cleanly close the connection
+     */
+close_notify:
+    printf( "  . Closing the connection..." );
+
+    /* No error checking, the connection might be closed already */
+    do ret = mbedtls_ssl_close_notify( &ssl );
+    while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+    ret = 0;
+
+    printf( " done\n" );
+
+    goto reset;
+
+    /*
+     * Final clean-ups and exit
+     */
+exit:
+
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        printf( "Last error was: %d - %s\n\n", ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( &client_fd );
+    mbedtls_net_free( &listen_fd );
+
+    mbedtls_x509_crt_free( &srvcert );
+    mbedtls_pk_free( &pkey );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+    mbedtls_ssl_cookie_free( &cookie_ctx );
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_free( &cache );
+#endif
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+#if defined(_WIN32)
+    printf( "  Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    /* Shell can not handle large exit numbers -> 1 for errors */
+    if( ret < 0 )
+        ret = 1;
+
+    mbedtls_exit( ret );
+}
+#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_PROTO_DTLS &&
+          MBEDTLS_SSL_COOKIE_C && MBEDTLS_NET_C && MBEDTLS_ENTROPY_C &&
+          MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_RSA_C
+          && MBEDTLS_CERTS_C && MBEDTLS_PEM_PARSE_C && MBEDTLS_TIMING_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/mini_client.c b/lib/mbedtls-2.27.0/programs/ssl/mini_client.c
new file mode 100644
index 0000000..0a9cc28
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/mini_client.c
@@ -0,0 +1,299 @@
+/*
+ *  Minimal SSL client, used for memory measurements.
+ *  (meant to be used with config-suite-b.h or config-ccm-psk-tls1_2.h)
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_printf          printf
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif
+
+/*
+ * We're creating and connecting the socket "manually" rather than using the
+ * NET module, in order to avoid the overhead of getaddrinfo() which tends to
+ * dominate memory usage in small configurations. For the sake of simplicity,
+ * only a Unix version is implemented.
+ *
+ * Warning: we are breaking some of the abtractions from the NET layer here.
+ * This is not a good example for general use. This programs has the specific
+ * goal of minimizing use of the libc functions on full-blown OSes.
+ */
+#if defined(unix) || defined(__unix__) || defined(__unix) || defined(__APPLE__)
+#define UNIX
+#endif
+
+#if !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_ENTROPY_C) || \
+    !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_SSL_CLI_C) || \
+    !defined(UNIX)
+
+int main( void )
+{
+    mbedtls_printf( "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_ENTROPY_C and/or "
+            "MBEDTLS_NET_C and/or MBEDTLS_SSL_CLI_C and/or UNIX "
+            "not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include <string.h>
+
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+/*
+ * Hardcoded values for server host and port
+ */
+#define PORT_BE 0x1151      /* 4433 */
+#define PORT_LE 0x5111
+#define ADDR_BE 0x7f000001  /* 127.0.0.1 */
+#define ADDR_LE 0x0100007f
+#define HOSTNAME "localhost" /* for cert verification if enabled */
+
+#define GET_REQUEST "GET / HTTP/1.0\r\n\r\n"
+
+const char *pers = "mini_client";
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+const unsigned char psk[] = {
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
+};
+const char psk_id[] = "Client_identity";
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+/* This is tests/data_files/test-ca2.crt, a CA using EC secp384r1 */
+const unsigned char ca_cert[] = {
+    0x30, 0x82, 0x02, 0x52, 0x30, 0x82, 0x01, 0xd7, 0xa0, 0x03, 0x02, 0x01,
+    0x02, 0x02, 0x09, 0x00, 0xc1, 0x43, 0xe2, 0x7e, 0x62, 0x43, 0xcc, 0xe8,
+    0x30, 0x0a, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02,
+    0x30, 0x3e, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13,
+    0x02, 0x4e, 0x4c, 0x31, 0x11, 0x30, 0x0f, 0x06, 0x03, 0x55, 0x04, 0x0a,
+    0x13, 0x08, 0x50, 0x6f, 0x6c, 0x61, 0x72, 0x53, 0x53, 0x4c, 0x31, 0x1c,
+    0x30, 0x1a, 0x06, 0x03, 0x55, 0x04, 0x03, 0x13, 0x13, 0x50, 0x6f, 0x6c,
+    0x61, 0x72, 0x73, 0x73, 0x6c, 0x20, 0x54, 0x65, 0x73, 0x74, 0x20, 0x45,
+    0x43, 0x20, 0x43, 0x41, 0x30, 0x1e, 0x17, 0x0d, 0x31, 0x33, 0x30, 0x39,
+    0x32, 0x34, 0x31, 0x35, 0x34, 0x39, 0x34, 0x38, 0x5a, 0x17, 0x0d, 0x32,
+    0x33, 0x30, 0x39, 0x32, 0x32, 0x31, 0x35, 0x34, 0x39, 0x34, 0x38, 0x5a,
+    0x30, 0x3e, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13,
+    0x02, 0x4e, 0x4c, 0x31, 0x11, 0x30, 0x0f, 0x06, 0x03, 0x55, 0x04, 0x0a,
+    0x13, 0x08, 0x50, 0x6f, 0x6c, 0x61, 0x72, 0x53, 0x53, 0x4c, 0x31, 0x1c,
+    0x30, 0x1a, 0x06, 0x03, 0x55, 0x04, 0x03, 0x13, 0x13, 0x50, 0x6f, 0x6c,
+    0x61, 0x72, 0x73, 0x73, 0x6c, 0x20, 0x54, 0x65, 0x73, 0x74, 0x20, 0x45,
+    0x43, 0x20, 0x43, 0x41, 0x30, 0x76, 0x30, 0x10, 0x06, 0x07, 0x2a, 0x86,
+    0x48, 0xce, 0x3d, 0x02, 0x01, 0x06, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x22,
+    0x03, 0x62, 0x00, 0x04, 0xc3, 0xda, 0x2b, 0x34, 0x41, 0x37, 0x58, 0x2f,
+    0x87, 0x56, 0xfe, 0xfc, 0x89, 0xba, 0x29, 0x43, 0x4b, 0x4e, 0xe0, 0x6e,
+    0xc3, 0x0e, 0x57, 0x53, 0x33, 0x39, 0x58, 0xd4, 0x52, 0xb4, 0x91, 0x95,
+    0x39, 0x0b, 0x23, 0xdf, 0x5f, 0x17, 0x24, 0x62, 0x48, 0xfc, 0x1a, 0x95,
+    0x29, 0xce, 0x2c, 0x2d, 0x87, 0xc2, 0x88, 0x52, 0x80, 0xaf, 0xd6, 0x6a,
+    0xab, 0x21, 0xdd, 0xb8, 0xd3, 0x1c, 0x6e, 0x58, 0xb8, 0xca, 0xe8, 0xb2,
+    0x69, 0x8e, 0xf3, 0x41, 0xad, 0x29, 0xc3, 0xb4, 0x5f, 0x75, 0xa7, 0x47,
+    0x6f, 0xd5, 0x19, 0x29, 0x55, 0x69, 0x9a, 0x53, 0x3b, 0x20, 0xb4, 0x66,
+    0x16, 0x60, 0x33, 0x1e, 0xa3, 0x81, 0xa0, 0x30, 0x81, 0x9d, 0x30, 0x1d,
+    0x06, 0x03, 0x55, 0x1d, 0x0e, 0x04, 0x16, 0x04, 0x14, 0x9d, 0x6d, 0x20,
+    0x24, 0x49, 0x01, 0x3f, 0x2b, 0xcb, 0x78, 0xb5, 0x19, 0xbc, 0x7e, 0x24,
+    0xc9, 0xdb, 0xfb, 0x36, 0x7c, 0x30, 0x6e, 0x06, 0x03, 0x55, 0x1d, 0x23,
+    0x04, 0x67, 0x30, 0x65, 0x80, 0x14, 0x9d, 0x6d, 0x20, 0x24, 0x49, 0x01,
+    0x3f, 0x2b, 0xcb, 0x78, 0xb5, 0x19, 0xbc, 0x7e, 0x24, 0xc9, 0xdb, 0xfb,
+    0x36, 0x7c, 0xa1, 0x42, 0xa4, 0x40, 0x30, 0x3e, 0x31, 0x0b, 0x30, 0x09,
+    0x06, 0x03, 0x55, 0x04, 0x06, 0x13, 0x02, 0x4e, 0x4c, 0x31, 0x11, 0x30,
+    0x0f, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x13, 0x08, 0x50, 0x6f, 0x6c, 0x61,
+    0x72, 0x53, 0x53, 0x4c, 0x31, 0x1c, 0x30, 0x1a, 0x06, 0x03, 0x55, 0x04,
+    0x03, 0x13, 0x13, 0x50, 0x6f, 0x6c, 0x61, 0x72, 0x73, 0x73, 0x6c, 0x20,
+    0x54, 0x65, 0x73, 0x74, 0x20, 0x45, 0x43, 0x20, 0x43, 0x41, 0x82, 0x09,
+    0x00, 0xc1, 0x43, 0xe2, 0x7e, 0x62, 0x43, 0xcc, 0xe8, 0x30, 0x0c, 0x06,
+    0x03, 0x55, 0x1d, 0x13, 0x04, 0x05, 0x30, 0x03, 0x01, 0x01, 0xff, 0x30,
+    0x0a, 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x04, 0x03, 0x02, 0x03,
+    0x69, 0x00, 0x30, 0x66, 0x02, 0x31, 0x00, 0xc3, 0xb4, 0x62, 0x73, 0x56,
+    0x28, 0x95, 0x00, 0x7d, 0x78, 0x12, 0x26, 0xd2, 0x71, 0x7b, 0x19, 0xf8,
+    0x8a, 0x98, 0x3e, 0x92, 0xfe, 0x33, 0x9e, 0xe4, 0x79, 0xd2, 0xfe, 0x7a,
+    0xb7, 0x87, 0x74, 0x3c, 0x2b, 0xb8, 0xd7, 0x69, 0x94, 0x0b, 0xa3, 0x67,
+    0x77, 0xb8, 0xb3, 0xbe, 0xd1, 0x36, 0x32, 0x02, 0x31, 0x00, 0xfd, 0x67,
+    0x9c, 0x94, 0x23, 0x67, 0xc0, 0x56, 0xba, 0x4b, 0x33, 0x15, 0x00, 0xc6,
+    0xe3, 0xcc, 0x31, 0x08, 0x2c, 0x9c, 0x8b, 0xda, 0xa9, 0x75, 0x23, 0x2f,
+    0xb8, 0x28, 0xe7, 0xf2, 0x9c, 0x14, 0x3a, 0x40, 0x01, 0x5c, 0xaf, 0x0c,
+    0xb2, 0xcf, 0x74, 0x7f, 0x30, 0x9f, 0x08, 0x43, 0xad, 0x20,
+};
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+enum exit_codes
+{
+    exit_ok = 0,
+    ctr_drbg_seed_failed,
+    ssl_config_defaults_failed,
+    ssl_setup_failed,
+    hostname_failed,
+    socket_failed,
+    connect_failed,
+    x509_crt_parse_failed,
+    ssl_handshake_failed,
+    ssl_write_failed,
+};
+
+
+int main( void )
+{
+    int ret = exit_ok;
+    mbedtls_net_context server_fd;
+    struct sockaddr_in addr;
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    mbedtls_x509_crt ca;
+#endif
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    /*
+     * 0. Initialize and setup stuff
+     */
+    mbedtls_net_init( &server_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    mbedtls_x509_crt_init( &ca );
+#endif
+
+    mbedtls_entropy_init( &entropy );
+    if( mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
+                       (const unsigned char *) pers, strlen( pers ) ) != 0 )
+    {
+        ret = ctr_drbg_seed_failed;
+        goto exit;
+    }
+
+    if( mbedtls_ssl_config_defaults( &conf,
+                MBEDTLS_SSL_IS_CLIENT,
+                MBEDTLS_SSL_TRANSPORT_STREAM,
+                MBEDTLS_SSL_PRESET_DEFAULT ) != 0 )
+    {
+        ret = ssl_config_defaults_failed;
+        goto exit;
+    }
+
+    mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+    mbedtls_ssl_conf_psk( &conf, psk, sizeof( psk ),
+                (const unsigned char *) psk_id, sizeof( psk_id ) - 1 );
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    if( mbedtls_x509_crt_parse_der( &ca, ca_cert, sizeof( ca_cert ) ) != 0 )
+    {
+        ret = x509_crt_parse_failed;
+        goto exit;
+    }
+
+    mbedtls_ssl_conf_ca_chain( &conf, &ca, NULL );
+    mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_REQUIRED );
+#endif
+
+    if( mbedtls_ssl_setup( &ssl, &conf ) != 0 )
+    {
+        ret = ssl_setup_failed;
+        goto exit;
+    }
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    if( mbedtls_ssl_set_hostname( &ssl, HOSTNAME ) != 0 )
+    {
+        ret = hostname_failed;
+        goto exit;
+    }
+#endif
+
+    /*
+     * 1. Start the connection
+     */
+    memset( &addr, 0, sizeof( addr ) );
+    addr.sin_family = AF_INET;
+
+    ret = 1; /* for endianness detection */
+    addr.sin_port = *((char *) &ret) == ret ? PORT_LE : PORT_BE;
+    addr.sin_addr.s_addr = *((char *) &ret) == ret ? ADDR_LE : ADDR_BE;
+    ret = 0;
+
+    if( ( server_fd.fd = socket( AF_INET, SOCK_STREAM, 0 ) ) < 0 )
+    {
+        ret = socket_failed;
+        goto exit;
+    }
+
+    if( connect( server_fd.fd,
+                (const struct sockaddr *) &addr, sizeof( addr ) ) < 0 )
+    {
+        ret = connect_failed;
+        goto exit;
+    }
+
+    mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
+
+    if( mbedtls_ssl_handshake( &ssl ) != 0 )
+    {
+        ret = ssl_handshake_failed;
+        goto exit;
+    }
+
+    /*
+     * 2. Write the GET request and close the connection
+     */
+    if( mbedtls_ssl_write( &ssl, (const unsigned char *) GET_REQUEST,
+                         sizeof( GET_REQUEST ) - 1 ) <= 0 )
+    {
+        ret = ssl_write_failed;
+        goto exit;
+    }
+
+    mbedtls_ssl_close_notify( &ssl );
+
+exit:
+    mbedtls_net_free( &server_fd );
+
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    mbedtls_x509_crt_free( &ca );
+#endif
+
+    mbedtls_exit( ret );
+}
+#endif
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_client1.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_client1.c
new file mode 100644
index 0000000..61a849c
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_client1.c
@@ -0,0 +1,318 @@
+/*
+ *  SSL client demonstration program
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_time            time
+#define mbedtls_time_t          time_t
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
+    !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
+    !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) ||         \
+    !defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C) || \
+    !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
+           "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
+           "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
+           "not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/debug.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/error.h"
+#include "mbedtls/certs.h"
+
+#include <string.h>
+
+#define SERVER_PORT "4433"
+#define SERVER_NAME "localhost"
+#define GET_REQUEST "GET / HTTP/1.0\r\n\r\n"
+
+#define DEBUG_LEVEL 1
+
+
+static void my_debug( void *ctx, int level,
+                      const char *file, int line,
+                      const char *str )
+{
+    ((void) level);
+
+    mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
+    fflush(  (FILE *) ctx  );
+}
+
+int main( void )
+{
+    int ret = 1, len;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_net_context server_fd;
+    uint32_t flags;
+    unsigned char buf[1024];
+    const char *pers = "ssl_client1";
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_x509_crt cacert;
+
+#if defined(MBEDTLS_DEBUG_C)
+    mbedtls_debug_set_threshold( DEBUG_LEVEL );
+#endif
+
+    /*
+     * 0. Initialize the RNG and the session data
+     */
+    mbedtls_net_init( &server_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    mbedtls_x509_crt_init( &cacert );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    mbedtls_printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    mbedtls_entropy_init( &entropy );
+    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
+                               (const unsigned char *) pers,
+                               strlen( pers ) ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 0. Initialize certificates
+     */
+    mbedtls_printf( "  . Loading the CA root certificate ..." );
+    fflush( stdout );
+
+    ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
+                          mbedtls_test_cas_pem_len );
+    if( ret < 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok (%d skipped)\n", ret );
+
+    /*
+     * 1. Start the connection
+     */
+    mbedtls_printf( "  . Connecting to tcp/%s/%s...", SERVER_NAME, SERVER_PORT );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_connect( &server_fd, SERVER_NAME,
+                                         SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_connect returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 2. Setup stuff
+     */
+    mbedtls_printf( "  . Setting up the SSL/TLS structure..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                    MBEDTLS_SSL_IS_CLIENT,
+                    MBEDTLS_SSL_TRANSPORT_STREAM,
+                    MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /* OPTIONAL is not optimal for security,
+     * but makes interop easier in this simplified example */
+    mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
+    mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
+    mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+    mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+
+    if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_ssl_set_hostname( &ssl, SERVER_NAME ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
+
+    /*
+     * 4. Handshake
+     */
+    mbedtls_printf( "  . Performing the SSL/TLS handshake..." );
+    fflush( stdout );
+
+    while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int) -ret );
+            goto exit;
+        }
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 5. Verify the server certificate
+     */
+    mbedtls_printf( "  . Verifying peer X.509 certificate..." );
+
+    /* In real life, we probably want to bail out when ret != 0 */
+    if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
+    {
+        char vrfy_buf[512];
+
+        mbedtls_printf( " failed\n" );
+
+        mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), "  ! ", flags );
+
+        mbedtls_printf( "%s\n", vrfy_buf );
+    }
+    else
+        mbedtls_printf( " ok\n" );
+
+    /*
+     * 3. Write the GET request
+     */
+    mbedtls_printf( "  > Write to server:" );
+    fflush( stdout );
+
+    len = sprintf( (char *) buf, GET_REQUEST );
+
+    while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n", ret );
+            goto exit;
+        }
+    }
+
+    len = ret;
+    mbedtls_printf( " %d bytes written\n\n%s", len, (char *) buf );
+
+    /*
+     * 7. Read the HTTP response
+     */
+    mbedtls_printf( "  < Read from server:" );
+    fflush( stdout );
+
+    do
+    {
+        len = sizeof( buf ) - 1;
+        memset( buf, 0, sizeof( buf ) );
+        ret = mbedtls_ssl_read( &ssl, buf, len );
+
+        if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
+            continue;
+
+        if( ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY )
+            break;
+
+        if( ret < 0 )
+        {
+            mbedtls_printf( "failed\n  ! mbedtls_ssl_read returned %d\n\n", ret );
+            break;
+        }
+
+        if( ret == 0 )
+        {
+            mbedtls_printf( "\n\nEOF\n\n" );
+            break;
+        }
+
+        len = ret;
+        mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
+    }
+    while( 1 );
+
+    mbedtls_ssl_close_notify( &ssl );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+#ifdef MBEDTLS_ERROR_C
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( &server_fd );
+
+    mbedtls_x509_crt_free( &cacert );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+#if defined(_WIN32)
+    mbedtls_printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    mbedtls_exit( exit_code );
+}
+#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
+          MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
+          MBEDTLS_CERTS_C && MBEDTLS_PEM_PARSE_C && MBEDTLS_CTR_DRBG_C &&
+          MBEDTLS_X509_CRT_PARSE_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_client2.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_client2.c
new file mode 100644
index 0000000..3937981
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_client2.c
@@ -0,0 +1,3081 @@
+/*
+ *  SSL client with certificate authentication
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include "ssl_test_lib.h"
+
+#if defined(MBEDTLS_SSL_TEST_IMPOSSIBLE)
+int main( void )
+{
+    mbedtls_printf( MBEDTLS_SSL_TEST_IMPOSSIBLE );
+    mbedtls_exit( 0 );
+}
+#elif !defined(MBEDTLS_SSL_CLI_C)
+int main( void )
+{
+    mbedtls_printf( "MBEDTLS_SSL_CLI_C not defined.\n" );
+    mbedtls_exit( 0 );
+}
+#else /* !MBEDTLS_SSL_TEST_IMPOSSIBLE && MBEDTLS_SSL_CLI_C */
+
+/* Size of memory to be allocated for the heap, when using the library's memory
+ * management and MBEDTLS_MEMORY_BUFFER_ALLOC_C is enabled. */
+#define MEMORY_HEAP_SIZE      120000
+
+#define MAX_REQUEST_SIZE      20000
+#define MAX_REQUEST_SIZE_STR "20000"
+
+#define DFL_SERVER_NAME         "localhost"
+#define DFL_SERVER_ADDR         NULL
+#define DFL_SERVER_PORT         "4433"
+#define DFL_REQUEST_PAGE        "/"
+#define DFL_REQUEST_SIZE        -1
+#define DFL_DEBUG_LEVEL         0
+#define DFL_CONTEXT_CRT_CB      0
+#define DFL_NBIO                0
+#define DFL_EVENT               0
+#define DFL_READ_TIMEOUT        0
+#define DFL_MAX_RESEND          0
+#define DFL_CA_FILE             ""
+#define DFL_CA_PATH             ""
+#define DFL_CRT_FILE            ""
+#define DFL_KEY_FILE            ""
+#define DFL_KEY_OPAQUE          0
+#define DFL_KEY_PWD             ""
+#define DFL_PSK                 ""
+#define DFL_PSK_OPAQUE          0
+#define DFL_PSK_IDENTITY        "Client_identity"
+#define DFL_ECJPAKE_PW          NULL
+#define DFL_EC_MAX_OPS          -1
+#define DFL_FORCE_CIPHER        0
+#define DFL_RENEGOTIATION       MBEDTLS_SSL_RENEGOTIATION_DISABLED
+#define DFL_ALLOW_LEGACY        -2
+#define DFL_RENEGOTIATE         0
+#define DFL_EXCHANGES           1
+#define DFL_MIN_VERSION         -1
+#define DFL_MAX_VERSION         -1
+#define DFL_ARC4                -1
+#define DFL_SHA1                -1
+#define DFL_AUTH_MODE           -1
+#define DFL_MFL_CODE            MBEDTLS_SSL_MAX_FRAG_LEN_NONE
+#define DFL_TRUNC_HMAC          -1
+#define DFL_RECSPLIT            -1
+#define DFL_DHMLEN              -1
+#define DFL_RECONNECT           0
+#define DFL_RECO_DELAY          0
+#define DFL_RECO_MODE           1
+#define DFL_CID_ENABLED         0
+#define DFL_CID_VALUE           ""
+#define DFL_CID_ENABLED_RENEGO  -1
+#define DFL_CID_VALUE_RENEGO    NULL
+#define DFL_RECONNECT_HARD      0
+#define DFL_TICKETS             MBEDTLS_SSL_SESSION_TICKETS_ENABLED
+#define DFL_ALPN_STRING         NULL
+#define DFL_CURVES              NULL
+#define DFL_TRANSPORT           MBEDTLS_SSL_TRANSPORT_STREAM
+#define DFL_HS_TO_MIN           0
+#define DFL_HS_TO_MAX           0
+#define DFL_DTLS_MTU            -1
+#define DFL_DGRAM_PACKING        1
+#define DFL_FALLBACK            -1
+#define DFL_EXTENDED_MS         -1
+#define DFL_ETM                 -1
+#define DFL_SERIALIZE           0
+#define DFL_CONTEXT_FILE        ""
+#define DFL_EXTENDED_MS_ENFORCE -1
+#define DFL_CA_CALLBACK         0
+#define DFL_EAP_TLS             0
+#define DFL_REPRODUCIBLE        0
+#define DFL_NSS_KEYLOG          0
+#define DFL_NSS_KEYLOG_FILE     NULL
+#define DFL_SKIP_CLOSE_NOTIFY   0
+#define DFL_QUERY_CONFIG_MODE   0
+#define DFL_USE_SRTP            0
+#define DFL_SRTP_FORCE_PROFILE  0
+#define DFL_SRTP_MKI            ""
+
+#define GET_REQUEST "GET %s HTTP/1.0\r\nExtra-header: "
+#define GET_REQUEST_END "\r\n\r\n"
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#define USAGE_CONTEXT_CRT_CB \
+    "    context_crt_cb=%%d   This determines whether the CRT verification callback is bound\n" \
+    "                        to the SSL configuration of the SSL context.\n" \
+    "                        Possible values:\n"\
+    "                        - 0 (default): Use CRT callback bound to configuration\n" \
+    "                        - 1: Use CRT callback bound to SSL context\n"
+#else
+#define USAGE_CONTEXT_CRT_CB ""
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#if defined(MBEDTLS_FS_IO)
+#define USAGE_IO \
+    "    ca_file=%%s          The single file containing the top-level CA(s) you fully trust\n" \
+    "                        default: \"\" (pre-loaded)\n" \
+    "                        use \"none\" to skip loading any top-level CAs.\n" \
+    "    ca_path=%%s          The path containing the top-level CA(s) you fully trust\n" \
+    "                        default: \"\" (pre-loaded) (overrides ca_file)\n" \
+    "                        use \"none\" to skip loading any top-level CAs.\n" \
+    "    crt_file=%%s         Your own cert and chain (in bottom to top order, top may be omitted)\n" \
+    "                        default: \"\" (pre-loaded)\n" \
+    "    key_file=%%s         default: \"\" (pre-loaded)\n"\
+    "    key_pwd=%%s          Password for key specified by key_file argument\n"\
+    "                        default: none\n"
+#else
+#define USAGE_IO \
+    "    No file operations available (MBEDTLS_FS_IO not defined)\n"
+#endif /* MBEDTLS_FS_IO */
+#else /* MBEDTLS_X509_CRT_PARSE_C */
+#define USAGE_IO ""
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+#if defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_X509_CRT_PARSE_C)
+#define USAGE_KEY_OPAQUE \
+    "    key_opaque=%%d       Handle your private key as if it were opaque\n" \
+    "                        default: 0 (disabled)\n"
+#else
+#define USAGE_KEY_OPAQUE ""
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+#define USAGE_CID \
+    "    cid=%%d             Disable (0) or enable (1) the use of the DTLS Connection ID extension.\n" \
+    "                       default: 0 (disabled)\n"     \
+    "    cid_renego=%%d      Disable (0) or enable (1) the use of the DTLS Connection ID extension during renegotiation.\n" \
+    "                       default: same as 'cid' parameter\n"     \
+    "    cid_val=%%s          The CID to use for incoming messages (in hex, without 0x).\n"  \
+    "                        default: \"\"\n" \
+    "    cid_val_renego=%%s   The CID to use for incoming messages (in hex, without 0x) after renegotiation.\n"  \
+    "                        default: same as 'cid_val' parameter\n"
+#else /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+#define USAGE_CID ""
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+#define USAGE_PSK_RAW                                               \
+    "    psk=%%s              default: \"\" (disabled)\n"     \
+    "                          The PSK values are in hex, without 0x.\n" \
+    "    psk_identity=%%s     default: \"Client_identity\"\n"
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+#define USAGE_PSK_SLOT                          \
+    "    psk_opaque=%%d       default: 0 (don't use opaque static PSK)\n"     \
+    "                          Enable this to store the PSK configured through command line\n" \
+    "                          parameter `psk` in a PSA-based key slot.\n" \
+    "                          Note: Currently only supported in conjunction with\n"                  \
+    "                          the use of min_version to force TLS 1.2 and force_ciphersuite \n"      \
+    "                          to force a particular PSK-only ciphersuite.\n"                         \
+    "                          Note: This is to test integration of PSA-based opaque PSKs with\n"     \
+    "                          Mbed TLS only. Production systems are likely to configure Mbed TLS\n"  \
+    "                          with prepopulated key slots instead of importing raw key material.\n"
+#else
+#define USAGE_PSK_SLOT ""
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+#define USAGE_PSK USAGE_PSK_RAW USAGE_PSK_SLOT
+#else
+#define USAGE_PSK ""
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
+
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+#define USAGE_CA_CALLBACK                       \
+    "   ca_callback=%%d       default: 0 (disabled)\n"      \
+    "                         Enable this to use the trusted certificate callback function\n"
+#else
+#define USAGE_CA_CALLBACK ""
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+#define USAGE_TICKETS                                       \
+    "    tickets=%%d          default: 1 (enabled)\n"
+#else
+#define USAGE_TICKETS ""
+#endif /* MBEDTLS_SSL_SESSION_TICKETS */
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+#define USAGE_EAP_TLS                                       \
+    "    eap_tls=%%d          default: 0 (disabled)\n"
+#define USAGE_NSS_KEYLOG                                    \
+    "    nss_keylog=%%d          default: 0 (disabled)\n"               \
+    "                             This cannot be used with eap_tls=1\n"
+#define USAGE_NSS_KEYLOG_FILE                               \
+    "    nss_keylog_file=%%s\n"
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+#define USAGE_SRTP \
+    "    use_srtp=%%d         default: 0 (disabled)\n" \
+    "                          This cannot be used with eap_tls=1 or "\
+    "                          nss_keylog=1\n"             \
+    "    srtp_force_profile=%%d  default: 0 (all enabled)\n"   \
+    "                        available profiles:\n"       \
+    "                        1 - SRTP_AES128_CM_HMAC_SHA1_80\n"  \
+    "                        2 - SRTP_AES128_CM_HMAC_SHA1_32\n"  \
+    "                        3 - SRTP_NULL_HMAC_SHA1_80\n"       \
+    "                        4 - SRTP_NULL_HMAC_SHA1_32\n"       \
+    "    mki=%%s              default: \"\" (in hex, without 0x)\n"
+#else /* MBEDTLS_SSL_DTLS_SRTP */
+#define USAGE_SRTP ""
+#endif
+#else /* MBEDTLS_SSL_EXPORT_KEYS */
+#define USAGE_EAP_TLS ""
+#define USAGE_NSS_KEYLOG ""
+#define USAGE_NSS_KEYLOG_FILE ""
+#define USAGE_SRTP ""
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+#define USAGE_TRUNC_HMAC                                    \
+    "    trunc_hmac=%%d       default: library default\n"
+#else
+#define USAGE_TRUNC_HMAC ""
+#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+#define USAGE_MAX_FRAG_LEN                                      \
+    "    max_frag_len=%%d     default: 16384 (tls default)\n"   \
+    "                        options: 512, 1024, 2048, 4096\n"
+#else
+#define USAGE_MAX_FRAG_LEN ""
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+#define USAGE_RECSPLIT \
+    "    recsplit=0/1        default: (library default: on)\n"
+#else
+#define USAGE_RECSPLIT
+#endif
+
+#if defined(MBEDTLS_DHM_C)
+#define USAGE_DHMLEN \
+    "    dhmlen=%%d           default: (library default: 1024 bits)\n"
+#else
+#define USAGE_DHMLEN
+#endif
+
+#if defined(MBEDTLS_SSL_ALPN)
+#define USAGE_ALPN \
+    "    alpn=%%s             default: \"\" (disabled)\n"   \
+    "                        example: spdy/1,http/1.1\n"
+#else
+#define USAGE_ALPN ""
+#endif /* MBEDTLS_SSL_ALPN */
+
+#if defined(MBEDTLS_ECP_C)
+#define USAGE_CURVES \
+    "    curves=a,b,c,d      default: \"default\" (library default)\n"  \
+    "                        example: \"secp521r1,brainpoolP512r1\"\n"  \
+    "                        - use \"none\" for empty list\n"           \
+    "                        - see mbedtls_ecp_curve_list()\n"          \
+    "                          for acceptable curve names\n"
+#else
+#define USAGE_CURVES ""
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+#define USAGE_DTLS \
+    "    dtls=%%d             default: 0 (TLS)\n"                           \
+    "    hs_timeout=%%d-%%d    default: (library default: 1000-60000)\n"    \
+    "                        range of DTLS handshake timeouts in millisecs\n" \
+    "    mtu=%%d              default: (library default: unlimited)\n"  \
+    "    dgram_packing=%%d    default: 1 (allowed)\n"                   \
+    "                        allow or forbid packing of multiple\n" \
+    "                        records within a single datgram.\n"
+#else
+#define USAGE_DTLS ""
+#endif
+
+#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
+#define USAGE_FALLBACK \
+    "    fallback=0/1        default: (library default: off)\n"
+#else
+#define USAGE_FALLBACK ""
+#endif
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+#define USAGE_EMS \
+    "    extended_ms=0/1     default: (library default: on)\n"
+#else
+#define USAGE_EMS ""
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+#define USAGE_ETM \
+    "    etm=0/1             default: (library default: on)\n"
+#else
+#define USAGE_ETM ""
+#endif
+
+#define USAGE_REPRODUCIBLE \
+    "    reproducible=0/1     default: 0 (disabled)\n"
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+#define USAGE_RENEGO \
+    "    renegotiation=%%d    default: 0 (disabled)\n"      \
+    "    renegotiate=%%d      default: 0 (disabled)\n"
+#else
+#define USAGE_RENEGO ""
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+#define USAGE_ECJPAKE \
+    "    ecjpake_pw=%%s       default: none (disabled)\n"
+#else
+#define USAGE_ECJPAKE ""
+#endif
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+#define USAGE_ECRESTART \
+    "    ec_max_ops=%%s       default: library default (restart disabled)\n"
+#else
+#define USAGE_ECRESTART ""
+#endif
+
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+#define USAGE_SERIALIZATION \
+    "    serialize=%%d        default: 0 (do not serialize/deserialize)\n"     \
+    "                        options: 1 (serialize)\n"                         \
+    "                                 2 (serialize with re-initialization)\n"  \
+    "    context_file=%%s     The file path to write a serialized connection\n"\
+    "                        in the form of base64 code (serialize option\n"   \
+    "                        must be set)\n"                                   \
+    "                         default: \"\" (do nothing)\n"                    \
+    "                         option: a file path\n"
+#else
+#define USAGE_SERIALIZATION ""
+#endif
+
+/* USAGE is arbitrarily split to stay under the portable string literal
+ * length limit: 4095 bytes in C99. */
+#define USAGE1 \
+    "\n usage: ssl_client2 param=<>...\n"                   \
+    "\n acceptable parameters:\n"                           \
+    "    server_name=%%s      default: localhost\n"         \
+    "    server_addr=%%s      default: given by name\n"     \
+    "    server_port=%%d      default: 4433\n"              \
+    "    request_page=%%s     default: \".\"\n"             \
+    "    request_size=%%d     default: about 34 (basic request)\n"           \
+    "                        (minimum: 0, max: " MAX_REQUEST_SIZE_STR ")\n"  \
+    "                        If 0, in the first exchange only an empty\n"    \
+    "                        application data message is sent followed by\n" \
+    "                        a second non-empty message before attempting\n" \
+    "                        to read a response from the server\n"           \
+    "    debug_level=%%d      default: 0 (disabled)\n"             \
+    "    nbio=%%d             default: 0 (blocking I/O)\n"         \
+    "                        options: 1 (non-blocking), 2 (added delays)\n"   \
+    "    event=%%d            default: 0 (loop)\n"                            \
+    "                        options: 1 (level-triggered, implies nbio=1),\n" \
+    "    read_timeout=%%d     default: 0 ms (no timeout)\n"        \
+    "    max_resend=%%d       default: 0 (no resend on timeout)\n" \
+    "    skip_close_notify=%%d default: 0 (send close_notify)\n" \
+    "\n"                                                    \
+    USAGE_DTLS                                              \
+    USAGE_CID                                               \
+    USAGE_SRTP                                              \
+    "\n"
+#define USAGE2 \
+    "    auth_mode=%%s        default: (library default: none)\n" \
+    "                        options: none, optional, required\n" \
+    USAGE_IO                                                \
+    USAGE_KEY_OPAQUE                                        \
+    USAGE_CA_CALLBACK                                       \
+    "\n"                                                    \
+    USAGE_PSK                                               \
+    USAGE_ECJPAKE                                           \
+    USAGE_ECRESTART                                         \
+    "\n"
+#define USAGE3 \
+    "    allow_legacy=%%d     default: (library default: no)\n"   \
+    USAGE_RENEGO                                            \
+    "    exchanges=%%d        default: 1\n"                 \
+    "    reconnect=%%d        number of reconnections using session resumption\n" \
+    "                        default: 0 (disabled)\n"      \
+    "    reco_delay=%%d       default: 0 seconds\n"         \
+    "    reco_mode=%%d        0: copy session, 1: serialize session\n" \
+    "                        default: 1\n"      \
+    "    reconnect_hard=%%d   default: 0 (disabled)\n"      \
+    USAGE_TICKETS                                           \
+    USAGE_EAP_TLS                                           \
+    USAGE_MAX_FRAG_LEN                                      \
+    USAGE_TRUNC_HMAC                                        \
+    USAGE_CONTEXT_CRT_CB                                    \
+    USAGE_ALPN                                              \
+    USAGE_FALLBACK                                          \
+    USAGE_EMS                                               \
+    USAGE_ETM                                               \
+    USAGE_REPRODUCIBLE                                      \
+    USAGE_CURVES                                            \
+    USAGE_RECSPLIT                                          \
+    USAGE_DHMLEN                                            \
+    "\n"
+#define USAGE4 \
+    "    arc4=%%d             default: (library default: 0)\n" \
+    "    allow_sha1=%%d       default: 0\n"                             \
+    "    min_version=%%s      default: (library default: tls1)\n"       \
+    "    max_version=%%s      default: (library default: tls1_2)\n"     \
+    "    force_version=%%s    default: \"\" (none)\n"       \
+    "                        options: ssl3, tls1, tls1_1, tls1_2, dtls1, dtls1_2\n" \
+    "\n"                                                    \
+    "    force_ciphersuite=<name>    default: all enabled\n"\
+    "    query_config=<name>         return 0 if the specified\n"       \
+    "                                configuration macro is defined and 1\n"  \
+    "                                otherwise. The expansion of the macro\n" \
+    "                                is printed if it is defined\n"     \
+    USAGE_SERIALIZATION                                     \
+    " acceptable ciphersuite names:\n"
+
+#define ALPN_LIST_SIZE  10
+#define CURVE_LIST_SIZE 20
+
+
+/*
+ * global options
+ */
+struct options
+{
+    const char *server_name;    /* hostname of the server (client only)     */
+    const char *server_addr;    /* address of the server (client only)      */
+    const char *server_port;    /* port on which the ssl service runs       */
+    int debug_level;            /* level of debugging                       */
+    int nbio;                   /* should I/O be blocking?                  */
+    int event;                  /* loop or event-driven IO? level or edge triggered? */
+    uint32_t read_timeout;      /* timeout on mbedtls_ssl_read() in milliseconds     */
+    int max_resend;             /* DTLS times to resend on read timeout     */
+    const char *request_page;   /* page on server to request                */
+    int request_size;           /* pad request with header to requested size */
+    const char *ca_file;        /* the file with the CA certificate(s)      */
+    const char *ca_path;        /* the path with the CA certificate(s) reside */
+    const char *crt_file;       /* the file with the client certificate     */
+    const char *key_file;       /* the file with the client key             */
+    int key_opaque;             /* handle private key as if it were opaque  */
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    int psk_opaque;
+#endif
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+    int ca_callback;            /* Use callback for trusted certificate list */
+#endif
+    const char *key_pwd;        /* the password for the client key          */
+    const char *psk;            /* the pre-shared key                       */
+    const char *psk_identity;   /* the pre-shared key identity              */
+    const char *ecjpake_pw;     /* the EC J-PAKE password                   */
+    int ec_max_ops;             /* EC consecutive operations limit          */
+    int force_ciphersuite[2];   /* protocol/ciphersuite to use, or all      */
+    int renegotiation;          /* enable / disable renegotiation           */
+    int allow_legacy;           /* allow legacy renegotiation               */
+    int renegotiate;            /* attempt renegotiation?                   */
+    int renego_delay;           /* delay before enforcing renegotiation     */
+    int exchanges;              /* number of data exchanges                 */
+    int min_version;            /* minimum protocol version accepted        */
+    int max_version;            /* maximum protocol version accepted        */
+    int arc4;                   /* flag for arc4 suites support             */
+    int allow_sha1;             /* flag for SHA-1 support                   */
+    int auth_mode;              /* verify mode for connection               */
+    unsigned char mfl_code;     /* code for maximum fragment length         */
+    int trunc_hmac;             /* negotiate truncated hmac or not          */
+    int recsplit;               /* enable record splitting?                 */
+    int dhmlen;                 /* minimum DHM params len in bits           */
+    int reconnect;              /* attempt to resume session                */
+    int reco_delay;             /* delay in seconds before resuming session */
+    int reco_mode;              /* how to keep the session around           */
+    int reconnect_hard;         /* unexpectedly reconnect from the same port */
+    int tickets;                /* enable / disable session tickets         */
+    const char *curves;         /* list of supported elliptic curves        */
+    const char *alpn_string;    /* ALPN supported protocols                 */
+    int transport;              /* TLS or DTLS?                             */
+    uint32_t hs_to_min;         /* Initial value of DTLS handshake timer    */
+    uint32_t hs_to_max;         /* Max value of DTLS handshake timer        */
+    int dtls_mtu;               /* UDP Maximum tranport unit for DTLS       */
+    int fallback;               /* is this a fallback connection?           */
+    int dgram_packing;          /* allow/forbid datagram packing            */
+    int extended_ms;            /* negotiate extended master secret?        */
+    int etm;                    /* negotiate encrypt then mac?              */
+    int context_crt_cb;         /* use context-specific CRT verify callback */
+    int eap_tls;                /* derive EAP-TLS keying material?          */
+    int nss_keylog;             /* export NSS key log material              */
+    const char *nss_keylog_file; /* NSS key log file                        */
+    int cid_enabled;            /* whether to use the CID extension or not  */
+    int cid_enabled_renego;     /* whether to use the CID extension or not
+                                 * during renegotiation                     */
+    const char *cid_val;        /* the CID to use for incoming messages     */
+    int serialize;              /* serialize/deserialize connection         */
+    const char *context_file;   /* the file to write a serialized connection
+                                 * in the form of base64 code (serialize
+                                 * option must be set)                      */
+    const char *cid_val_renego; /* the CID to use for incoming messages
+                                 * after renegotiation                      */
+    int reproducible;           /* make communication reproducible          */
+    int skip_close_notify;      /* skip sending the close_notify alert      */
+    int query_config_mode;      /* whether to read config                   */
+    int use_srtp;               /* Support SRTP                             */
+    int force_srtp_profile;     /* SRTP protection profile to use or all    */
+    const char *mki;            /* The dtls mki value to use                */
+} opt;
+
+#include "ssl_test_common_source.c"
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+static unsigned char peer_crt_info[1024];
+
+/*
+ * Enabled if debug_level > 1 in code below
+ */
+static int my_verify( void *data, mbedtls_x509_crt *crt,
+                      int depth, uint32_t *flags )
+{
+    char buf[1024];
+    ((void) data);
+
+    mbedtls_x509_crt_info( buf, sizeof( buf ) - 1, "", crt );
+    if( depth == 0 )
+        memcpy( peer_crt_info, buf, sizeof( buf ) );
+
+    if( opt.debug_level == 0 )
+        return( 0 );
+
+    mbedtls_printf( "\nVerify requested for (Depth %d):\n", depth );
+    mbedtls_printf( "%s", buf );
+
+    if ( ( *flags ) == 0 )
+        mbedtls_printf( "  This certificate has no flags\n" );
+    else
+    {
+        mbedtls_x509_crt_verify_info( buf, sizeof( buf ), "  ! ", *flags );
+        mbedtls_printf( "%s\n", buf );
+    }
+
+    return( 0 );
+}
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+int report_cid_usage( mbedtls_ssl_context *ssl,
+                      const char *additional_description )
+{
+    int ret;
+    unsigned char peer_cid[ MBEDTLS_SSL_CID_OUT_LEN_MAX ];
+    size_t peer_cid_len;
+    int cid_negotiated;
+
+    if( opt.transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+        return( 0 );
+
+    /* Check if the use of a CID has been negotiated,
+     * but don't ask for the CID value and length.
+     *
+     * Note: Here and below, we're demonstrating the various ways
+     *       in which mbedtls_ssl_get_peer_cid() can be called,
+     *       depending on whether or not the length/value of the
+     *       peer's CID is needed.
+     *
+     *       An actual application, however, should use
+     *       just one call to mbedtls_ssl_get_peer_cid(). */
+    ret = mbedtls_ssl_get_peer_cid( ssl, &cid_negotiated,
+                                    NULL, NULL );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_get_peer_cid returned -0x%x\n\n",
+                        (unsigned int) -ret );
+        return( ret );
+    }
+
+    if( cid_negotiated == MBEDTLS_SSL_CID_DISABLED )
+    {
+        if( opt.cid_enabled == MBEDTLS_SSL_CID_ENABLED )
+        {
+            mbedtls_printf( "(%s) Use of Connection ID was rejected by the server.\n",
+                            additional_description );
+        }
+    }
+    else
+    {
+        size_t idx=0;
+        mbedtls_printf( "(%s) Use of Connection ID has been negotiated.\n",
+                        additional_description );
+
+        /* Ask for just the length of the peer's CID. */
+        ret = mbedtls_ssl_get_peer_cid( ssl, &cid_negotiated,
+                                        NULL, &peer_cid_len );
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_get_peer_cid returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            return( ret );
+        }
+
+        /* Ask for just length + value of the peer's CID. */
+        ret = mbedtls_ssl_get_peer_cid( ssl, &cid_negotiated,
+                                        peer_cid, &peer_cid_len );
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_get_peer_cid returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            return( ret );
+        }
+        mbedtls_printf( "(%s) Peer CID (length %u Bytes): ",
+                        additional_description,
+                        (unsigned) peer_cid_len );
+        while( idx < peer_cid_len )
+        {
+            mbedtls_printf( "%02x ", peer_cid[ idx ] );
+            idx++;
+        }
+        mbedtls_printf( "\n" );
+    }
+
+    return( 0 );
+}
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+int main( int argc, char *argv[] )
+{
+    int ret = 0, len, tail_len, i, written, frags, retry_left;
+    int query_config_ret = 0;
+    mbedtls_net_context server_fd;
+    io_ctx_t io_ctx;
+
+    unsigned char buf[MAX_REQUEST_SIZE + 1];
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+    unsigned char psk[MBEDTLS_PSK_MAX_LEN];
+    size_t psk_len = 0;
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    unsigned char cid[MBEDTLS_SSL_CID_IN_LEN_MAX];
+    unsigned char cid_renego[MBEDTLS_SSL_CID_IN_LEN_MAX];
+    size_t cid_len = 0;
+    size_t cid_renego_len = 0;
+#endif
+
+#if defined(MBEDTLS_SSL_ALPN)
+    const char *alpn_list[ALPN_LIST_SIZE];
+#endif
+
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+    unsigned char alloc_buf[MEMORY_HEAP_SIZE];
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+    mbedtls_ecp_group_id curve_list[CURVE_LIST_SIZE];
+    const mbedtls_ecp_curve_info *curve_cur;
+#endif
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+    unsigned char mki[MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH];
+    size_t mki_len=0;
+#endif
+
+    const char *pers = "ssl_client2";
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_key_id_t slot = 0;
+    psa_algorithm_t alg = 0;
+    psa_key_attributes_t key_attributes;
+    psa_status_t status;
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    mbedtls_x509_crt_profile crt_profile_for_test = mbedtls_x509_crt_profile_default;
+#endif
+    rng_context_t rng;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_ssl_session saved_session;
+    unsigned char *session_data = NULL;
+    size_t session_data_len = 0;
+#if defined(MBEDTLS_TIMING_C)
+    mbedtls_timing_delay_context timer;
+#endif
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    uint32_t flags;
+    mbedtls_x509_crt cacert;
+    mbedtls_x509_crt clicert;
+    mbedtls_pk_context pkey;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_key_id_t key_slot = 0; /* invalid key slot */
+#endif
+#endif  /* MBEDTLS_X509_CRT_PARSE_C */
+    char *p, *q;
+    const int *list;
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+    unsigned char *context_buf = NULL;
+    size_t context_buf_len;
+#endif
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+    unsigned char eap_tls_keymaterial[16];
+    unsigned char eap_tls_iv[8];
+    const char* eap_tls_label = "client EAP encryption";
+    eap_tls_keys eap_tls_keying;
+#if defined( MBEDTLS_SSL_DTLS_SRTP )
+    /*! master keys and master salt for SRTP generated during handshake */
+    unsigned char dtls_srtp_key_material[MBEDTLS_TLS_SRTP_MAX_KEY_MATERIAL_LENGTH];
+    const char* dtls_srtp_label = "EXTRACTOR-dtls_srtp";
+    dtls_srtp_keys dtls_srtp_keying;
+    const mbedtls_ssl_srtp_profile default_profiles[] = {
+        MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80,
+        MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32,
+        MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80,
+        MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32,
+        MBEDTLS_TLS_SRTP_UNSET
+    };
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+    mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
+#endif
+
+#if defined(MBEDTLS_TEST_HOOKS)
+    test_hooks_init( );
+#endif /* MBEDTLS_TEST_HOOKS */
+
+    /*
+     * Make sure memory references are valid.
+     */
+    mbedtls_net_init( &server_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    memset( &saved_session, 0, sizeof( mbedtls_ssl_session ) );
+    rng_init( &rng );
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    mbedtls_x509_crt_init( &cacert );
+    mbedtls_x509_crt_init( &clicert );
+    mbedtls_pk_init( &pkey );
+#endif
+#if defined(MBEDTLS_SSL_ALPN)
+    memset( (void * ) alpn_list, 0, sizeof( alpn_list ) );
+#endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    status = psa_crypto_init();
+    if( status != PSA_SUCCESS )
+    {
+        mbedtls_fprintf( stderr, "Failed to initialize PSA Crypto implementation: %d\n",
+                         (int) status );
+        ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
+        goto exit;
+    }
+#endif  /* MBEDTLS_USE_PSA_CRYPTO */
+#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
+    mbedtls_test_enable_insecure_external_rng( );
+#endif  /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
+
+    if( argc == 0 )
+    {
+    usage:
+        if( ret == 0 )
+            ret = 1;
+
+        mbedtls_printf( USAGE1 );
+        mbedtls_printf( USAGE2 );
+        mbedtls_printf( USAGE3 );
+        mbedtls_printf( USAGE4 );
+
+        list = mbedtls_ssl_list_ciphersuites();
+        while( *list )
+        {
+            mbedtls_printf(" %-42s", mbedtls_ssl_get_ciphersuite_name( *list ) );
+            list++;
+            if( !*list )
+                break;
+            mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name( *list ) );
+            list++;
+        }
+        mbedtls_printf("\n");
+        goto exit;
+    }
+
+    opt.server_name         = DFL_SERVER_NAME;
+    opt.server_addr         = DFL_SERVER_ADDR;
+    opt.server_port         = DFL_SERVER_PORT;
+    opt.debug_level         = DFL_DEBUG_LEVEL;
+    opt.cid_enabled         = DFL_CID_ENABLED;
+    opt.cid_val             = DFL_CID_VALUE;
+    opt.cid_enabled_renego  = DFL_CID_ENABLED_RENEGO;
+    opt.cid_val_renego      = DFL_CID_VALUE_RENEGO;
+    opt.nbio                = DFL_NBIO;
+    opt.event               = DFL_EVENT;
+    opt.context_crt_cb      = DFL_CONTEXT_CRT_CB;
+    opt.read_timeout        = DFL_READ_TIMEOUT;
+    opt.max_resend          = DFL_MAX_RESEND;
+    opt.request_page        = DFL_REQUEST_PAGE;
+    opt.request_size        = DFL_REQUEST_SIZE;
+    opt.ca_file             = DFL_CA_FILE;
+    opt.ca_path             = DFL_CA_PATH;
+    opt.crt_file            = DFL_CRT_FILE;
+    opt.key_file            = DFL_KEY_FILE;
+    opt.key_opaque          = DFL_KEY_OPAQUE;
+    opt.key_pwd             = DFL_KEY_PWD;
+    opt.psk                 = DFL_PSK;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    opt.psk_opaque          = DFL_PSK_OPAQUE;
+#endif
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+    opt.ca_callback         = DFL_CA_CALLBACK;
+#endif
+    opt.psk_identity        = DFL_PSK_IDENTITY;
+    opt.ecjpake_pw          = DFL_ECJPAKE_PW;
+    opt.ec_max_ops          = DFL_EC_MAX_OPS;
+    opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
+    opt.renegotiation       = DFL_RENEGOTIATION;
+    opt.allow_legacy        = DFL_ALLOW_LEGACY;
+    opt.renegotiate         = DFL_RENEGOTIATE;
+    opt.exchanges           = DFL_EXCHANGES;
+    opt.min_version         = DFL_MIN_VERSION;
+    opt.max_version         = DFL_MAX_VERSION;
+    opt.arc4                = DFL_ARC4;
+    opt.allow_sha1          = DFL_SHA1;
+    opt.auth_mode           = DFL_AUTH_MODE;
+    opt.mfl_code            = DFL_MFL_CODE;
+    opt.trunc_hmac          = DFL_TRUNC_HMAC;
+    opt.recsplit            = DFL_RECSPLIT;
+    opt.dhmlen              = DFL_DHMLEN;
+    opt.reconnect           = DFL_RECONNECT;
+    opt.reco_delay          = DFL_RECO_DELAY;
+    opt.reco_mode           = DFL_RECO_MODE;
+    opt.reconnect_hard      = DFL_RECONNECT_HARD;
+    opt.tickets             = DFL_TICKETS;
+    opt.alpn_string         = DFL_ALPN_STRING;
+    opt.curves              = DFL_CURVES;
+    opt.transport           = DFL_TRANSPORT;
+    opt.hs_to_min           = DFL_HS_TO_MIN;
+    opt.hs_to_max           = DFL_HS_TO_MAX;
+    opt.dtls_mtu            = DFL_DTLS_MTU;
+    opt.fallback            = DFL_FALLBACK;
+    opt.extended_ms         = DFL_EXTENDED_MS;
+    opt.etm                 = DFL_ETM;
+    opt.dgram_packing       = DFL_DGRAM_PACKING;
+    opt.serialize           = DFL_SERIALIZE;
+    opt.context_file        = DFL_CONTEXT_FILE;
+    opt.eap_tls             = DFL_EAP_TLS;
+    opt.reproducible        = DFL_REPRODUCIBLE;
+    opt.nss_keylog          = DFL_NSS_KEYLOG;
+    opt.nss_keylog_file     = DFL_NSS_KEYLOG_FILE;
+    opt.skip_close_notify   = DFL_SKIP_CLOSE_NOTIFY;
+    opt.query_config_mode   = DFL_QUERY_CONFIG_MODE;
+    opt.use_srtp            = DFL_USE_SRTP;
+    opt.force_srtp_profile  = DFL_SRTP_FORCE_PROFILE;
+    opt.mki                 = DFL_SRTP_MKI;
+
+    for( i = 1; i < argc; i++ )
+    {
+        p = argv[i];
+        if( ( q = strchr( p, '=' ) ) == NULL )
+            goto usage;
+        *q++ = '\0';
+
+        if( strcmp( p, "server_name" ) == 0 )
+            opt.server_name = q;
+        else if( strcmp( p, "server_addr" ) == 0 )
+            opt.server_addr = q;
+        else if( strcmp( p, "server_port" ) == 0 )
+            opt.server_port = q;
+        else if( strcmp( p, "dtls" ) == 0 )
+        {
+            int t = atoi( q );
+            if( t == 0 )
+                opt.transport = MBEDTLS_SSL_TRANSPORT_STREAM;
+            else if( t == 1 )
+                opt.transport = MBEDTLS_SSL_TRANSPORT_DATAGRAM;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "debug_level" ) == 0 )
+        {
+            opt.debug_level = atoi( q );
+            if( opt.debug_level < 0 || opt.debug_level > 65535 )
+                goto usage;
+        }
+        else if( strcmp( p, "context_crt_cb" ) == 0 )
+        {
+            opt.context_crt_cb = atoi( q );
+            if( opt.context_crt_cb != 0 && opt.context_crt_cb != 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "nbio" ) == 0 )
+        {
+            opt.nbio = atoi( q );
+            if( opt.nbio < 0 || opt.nbio > 2 )
+                goto usage;
+        }
+        else if( strcmp( p, "event" ) == 0 )
+        {
+            opt.event = atoi( q );
+            if( opt.event < 0 || opt.event > 2 )
+                goto usage;
+        }
+        else if( strcmp( p, "read_timeout" ) == 0 )
+            opt.read_timeout = atoi( q );
+        else if( strcmp( p, "max_resend" ) == 0 )
+        {
+            opt.max_resend = atoi( q );
+            if( opt.max_resend < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "request_page" ) == 0 )
+            opt.request_page = q;
+        else if( strcmp( p, "request_size" ) == 0 )
+        {
+            opt.request_size = atoi( q );
+            if( opt.request_size < 0 ||
+                opt.request_size > MAX_REQUEST_SIZE )
+                goto usage;
+        }
+        else if( strcmp( p, "ca_file" ) == 0 )
+            opt.ca_file = q;
+        else if( strcmp( p, "ca_path" ) == 0 )
+            opt.ca_path = q;
+        else if( strcmp( p, "crt_file" ) == 0 )
+            opt.crt_file = q;
+        else if( strcmp( p, "key_file" ) == 0 )
+            opt.key_file = q;
+        else if( strcmp( p, "key_pwd" ) == 0 )
+            opt.key_pwd = q;
+#if defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_X509_CRT_PARSE_C)
+        else if( strcmp( p, "key_opaque" ) == 0 )
+            opt.key_opaque = atoi( q );
+#endif
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+        else if( strcmp( p, "cid" ) == 0 )
+        {
+            opt.cid_enabled = atoi( q );
+            if( opt.cid_enabled != 0 && opt.cid_enabled != 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "cid_renego" ) == 0 )
+        {
+            opt.cid_enabled_renego = atoi( q );
+            if( opt.cid_enabled_renego != 0 && opt.cid_enabled_renego != 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "cid_val" ) == 0 )
+        {
+            opt.cid_val = q;
+        }
+        else if( strcmp( p, "cid_val_renego" ) == 0 )
+        {
+            opt.cid_val_renego = q;
+        }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+        else if( strcmp( p, "psk" ) == 0 )
+            opt.psk = q;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+        else if( strcmp( p, "psk_opaque" ) == 0 )
+            opt.psk_opaque = atoi( q );
+#endif
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+        else if( strcmp( p, "ca_callback" ) == 0)
+            opt.ca_callback = atoi( q );
+#endif
+        else if( strcmp( p, "psk_identity" ) == 0 )
+            opt.psk_identity = q;
+        else if( strcmp( p, "ecjpake_pw" ) == 0 )
+            opt.ecjpake_pw = q;
+        else if( strcmp( p, "ec_max_ops" ) == 0 )
+            opt.ec_max_ops = atoi( q );
+        else if( strcmp( p, "force_ciphersuite" ) == 0 )
+        {
+            opt.force_ciphersuite[0] = mbedtls_ssl_get_ciphersuite_id( q );
+
+            if( opt.force_ciphersuite[0] == 0 )
+            {
+                ret = 2;
+                goto usage;
+            }
+            opt.force_ciphersuite[1] = 0;
+        }
+        else if( strcmp( p, "renegotiation" ) == 0 )
+        {
+            opt.renegotiation = (atoi( q )) ?
+                MBEDTLS_SSL_RENEGOTIATION_ENABLED :
+                MBEDTLS_SSL_RENEGOTIATION_DISABLED;
+        }
+        else if( strcmp( p, "allow_legacy" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case -1:
+                    opt.allow_legacy = MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE;
+                    break;
+                case 0:
+                    opt.allow_legacy = MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION;
+                    break;
+                case 1:
+                    opt.allow_legacy = MBEDTLS_SSL_LEGACY_ALLOW_RENEGOTIATION;
+                    break;
+                default: goto usage;
+            }
+        }
+        else if( strcmp( p, "renegotiate" ) == 0 )
+        {
+            opt.renegotiate = atoi( q );
+            if( opt.renegotiate < 0 || opt.renegotiate > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "exchanges" ) == 0 )
+        {
+            opt.exchanges = atoi( q );
+            if( opt.exchanges < 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "reconnect" ) == 0 )
+        {
+            opt.reconnect = atoi( q );
+            if( opt.reconnect < 0 || opt.reconnect > 2 )
+                goto usage;
+        }
+        else if( strcmp( p, "reco_delay" ) == 0 )
+        {
+            opt.reco_delay = atoi( q );
+            if( opt.reco_delay < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "reco_mode" ) == 0 )
+        {
+            opt.reco_mode = atoi( q );
+            if( opt.reco_mode < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "reconnect_hard" ) == 0 )
+        {
+            opt.reconnect_hard = atoi( q );
+            if( opt.reconnect_hard < 0 || opt.reconnect_hard > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "tickets" ) == 0 )
+        {
+            opt.tickets = atoi( q );
+            if( opt.tickets < 0 || opt.tickets > 2 )
+                goto usage;
+        }
+        else if( strcmp( p, "alpn" ) == 0 )
+        {
+            opt.alpn_string = q;
+        }
+        else if( strcmp( p, "fallback" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0: opt.fallback = MBEDTLS_SSL_IS_NOT_FALLBACK; break;
+                case 1: opt.fallback = MBEDTLS_SSL_IS_FALLBACK; break;
+                default: goto usage;
+            }
+        }
+        else if( strcmp( p, "extended_ms" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0:
+                    opt.extended_ms = MBEDTLS_SSL_EXTENDED_MS_DISABLED;
+                    break;
+                case 1:
+                    opt.extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
+                    break;
+                default: goto usage;
+            }
+        }
+        else if( strcmp( p, "curves" ) == 0 )
+            opt.curves = q;
+        else if( strcmp( p, "etm" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0: opt.etm = MBEDTLS_SSL_ETM_DISABLED; break;
+                case 1: opt.etm = MBEDTLS_SSL_ETM_ENABLED; break;
+                default: goto usage;
+            }
+        }
+        else if( strcmp( p, "min_version" ) == 0 )
+        {
+            if( strcmp( q, "ssl3" ) == 0 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_0;
+            else if( strcmp( q, "tls1" ) == 0 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_1;
+            else if( strcmp( q, "tls1_1" ) == 0 ||
+                     strcmp( q, "dtls1" ) == 0 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
+            else if( strcmp( q, "tls1_2" ) == 0 ||
+                     strcmp( q, "dtls1_2" ) == 0 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_3;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "max_version" ) == 0 )
+        {
+            if( strcmp( q, "ssl3" ) == 0 )
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_0;
+            else if( strcmp( q, "tls1" ) == 0 )
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_1;
+            else if( strcmp( q, "tls1_1" ) == 0 ||
+                     strcmp( q, "dtls1" ) == 0 )
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_2;
+            else if( strcmp( q, "tls1_2" ) == 0 ||
+                     strcmp( q, "dtls1_2" ) == 0 )
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_3;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "arc4" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0:     opt.arc4 = MBEDTLS_SSL_ARC4_DISABLED;   break;
+                case 1:     opt.arc4 = MBEDTLS_SSL_ARC4_ENABLED;    break;
+                default:    goto usage;
+            }
+        }
+        else if( strcmp( p, "allow_sha1" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0:     opt.allow_sha1 = 0;   break;
+                case 1:     opt.allow_sha1 = 1;    break;
+                default:    goto usage;
+            }
+        }
+        else if( strcmp( p, "force_version" ) == 0 )
+        {
+            if( strcmp( q, "ssl3" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_0;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_0;
+            }
+            else if( strcmp( q, "tls1" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_1;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_1;
+            }
+            else if( strcmp( q, "tls1_1" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_2;
+            }
+            else if( strcmp( q, "tls1_2" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_3;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_3;
+            }
+            else if( strcmp( q, "dtls1" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_2;
+                opt.transport = MBEDTLS_SSL_TRANSPORT_DATAGRAM;
+            }
+            else if( strcmp( q, "dtls1_2" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_3;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_3;
+                opt.transport = MBEDTLS_SSL_TRANSPORT_DATAGRAM;
+            }
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "auth_mode" ) == 0 )
+        {
+            if( strcmp( q, "none" ) == 0 )
+                opt.auth_mode = MBEDTLS_SSL_VERIFY_NONE;
+            else if( strcmp( q, "optional" ) == 0 )
+                opt.auth_mode = MBEDTLS_SSL_VERIFY_OPTIONAL;
+            else if( strcmp( q, "required" ) == 0 )
+                opt.auth_mode = MBEDTLS_SSL_VERIFY_REQUIRED;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "max_frag_len" ) == 0 )
+        {
+            if( strcmp( q, "512" ) == 0 )
+                opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_512;
+            else if( strcmp( q, "1024" ) == 0 )
+                opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_1024;
+            else if( strcmp( q, "2048" ) == 0 )
+                opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_2048;
+            else if( strcmp( q, "4096" ) == 0 )
+                opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_4096;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "trunc_hmac" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0: opt.trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_DISABLED; break;
+                case 1: opt.trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED; break;
+                default: goto usage;
+            }
+        }
+        else if( strcmp( p, "hs_timeout" ) == 0 )
+        {
+            if( ( p = strchr( q, '-' ) ) == NULL )
+                goto usage;
+            *p++ = '\0';
+            opt.hs_to_min = atoi( q );
+            opt.hs_to_max = atoi( p );
+            if( opt.hs_to_min == 0 || opt.hs_to_max < opt.hs_to_min )
+                goto usage;
+        }
+        else if( strcmp( p, "mtu" ) == 0 )
+        {
+            opt.dtls_mtu = atoi( q );
+            if( opt.dtls_mtu < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "dgram_packing" ) == 0 )
+        {
+            opt.dgram_packing = atoi( q );
+            if( opt.dgram_packing != 0 &&
+                opt.dgram_packing != 1 )
+            {
+                goto usage;
+            }
+        }
+        else if( strcmp( p, "recsplit" ) == 0 )
+        {
+            opt.recsplit = atoi( q );
+            if( opt.recsplit < 0 || opt.recsplit > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "dhmlen" ) == 0 )
+        {
+            opt.dhmlen = atoi( q );
+            if( opt.dhmlen < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "query_config" ) == 0 )
+        {
+            opt.query_config_mode = 1;
+            query_config_ret = query_config( q );
+            goto exit;
+        }
+        else if( strcmp( p, "serialize") == 0 )
+        {
+            opt.serialize = atoi( q );
+            if( opt.serialize < 0 || opt.serialize > 2)
+                goto usage;
+        }
+        else if( strcmp( p, "context_file") == 0 )
+        {
+            opt.context_file = q;
+        }
+        else if( strcmp( p, "eap_tls" ) == 0 )
+        {
+            opt.eap_tls = atoi( q );
+            if( opt.eap_tls < 0 || opt.eap_tls > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "reproducible" ) == 0 )
+        {
+            opt.reproducible = 1;
+        }
+        else if( strcmp( p, "nss_keylog" ) == 0 )
+        {
+            opt.nss_keylog = atoi( q );
+            if( opt.nss_keylog < 0 || opt.nss_keylog > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "nss_keylog_file" ) == 0 )
+        {
+            opt.nss_keylog_file = q;
+        }
+        else if( strcmp( p, "skip_close_notify" ) == 0 )
+        {
+            opt.skip_close_notify = atoi( q );
+            if( opt.skip_close_notify < 0 || opt.skip_close_notify > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "use_srtp" ) == 0 )
+        {
+            opt.use_srtp = atoi ( q );
+        }
+        else if( strcmp( p, "srtp_force_profile" ) == 0 )
+        {
+            opt.force_srtp_profile = atoi( q );
+        }
+        else if( strcmp( p, "mki" ) == 0 )
+        {
+            opt.mki = q;
+        }
+        else
+            goto usage;
+    }
+
+    if( opt.nss_keylog != 0 && opt.eap_tls != 0 )
+    {
+        mbedtls_printf( "Error: eap_tls and nss_keylog options cannot be used together.\n" );
+        goto usage;
+    }
+
+    /* Event-driven IO is incompatible with the above custom
+     * receive and send functions, as the polling builds on
+     * refers to the underlying net_context. */
+    if( opt.event == 1 && opt.nbio != 1 )
+    {
+        mbedtls_printf( "Warning: event-driven IO mandates nbio=1 - overwrite\n" );
+        opt.nbio = 1;
+    }
+
+#if defined(MBEDTLS_DEBUG_C)
+    mbedtls_debug_set_threshold( opt.debug_level );
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+    /*
+     * Unhexify the pre-shared key if any is given
+     */
+    if( strlen( opt.psk ) )
+    {
+        if( mbedtls_test_unhexify( psk, sizeof( psk ),
+                                   opt.psk, &psk_len ) != 0 )
+        {
+            mbedtls_printf( "pre-shared key not valid\n" );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if( opt.psk_opaque != 0 )
+    {
+        if( opt.psk == NULL )
+        {
+            mbedtls_printf( "psk_opaque set but no psk to be imported specified.\n" );
+            ret = 2;
+            goto usage;
+        }
+
+        if( opt.force_ciphersuite[0] <= 0 )
+        {
+            mbedtls_printf( "opaque PSKs are only supported in conjunction with forcing TLS 1.2 and a PSK-only ciphersuite through the 'force_ciphersuite' option.\n" );
+            ret = 2;
+            goto usage;
+        }
+    }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+    if( opt.force_ciphersuite[0] > 0 )
+    {
+        const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
+        ciphersuite_info =
+            mbedtls_ssl_ciphersuite_from_id( opt.force_ciphersuite[0] );
+
+        if( opt.max_version != -1 &&
+            ciphersuite_info->min_minor_ver > opt.max_version )
+        {
+            mbedtls_printf( "forced ciphersuite not allowed with this protocol version\n" );
+            ret = 2;
+            goto usage;
+        }
+        if( opt.min_version != -1 &&
+            ciphersuite_info->max_minor_ver < opt.min_version )
+        {
+            mbedtls_printf( "forced ciphersuite not allowed with this protocol version\n" );
+            ret = 2;
+            goto usage;
+        }
+
+        /* If the server selects a version that's not supported by
+         * this suite, then there will be no common ciphersuite... */
+        if( opt.max_version == -1 ||
+            opt.max_version > ciphersuite_info->max_minor_ver )
+        {
+            opt.max_version = ciphersuite_info->max_minor_ver;
+        }
+        if( opt.min_version < ciphersuite_info->min_minor_ver )
+        {
+            opt.min_version = ciphersuite_info->min_minor_ver;
+            /* DTLS starts with TLS 1.1 */
+            if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+                opt.min_version < MBEDTLS_SSL_MINOR_VERSION_2 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
+        }
+
+        /* Enable RC4 if needed and not explicitly disabled */
+        if( ciphersuite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
+        {
+            if( opt.arc4 == MBEDTLS_SSL_ARC4_DISABLED )
+            {
+                mbedtls_printf( "forced RC4 ciphersuite with RC4 disabled\n" );
+                ret = 2;
+                goto usage;
+            }
+
+            opt.arc4 = MBEDTLS_SSL_ARC4_ENABLED;
+        }
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+        if( opt.psk_opaque != 0 )
+        {
+            /* Ensure that the chosen ciphersuite is PSK-only; we must know
+             * the ciphersuite in advance to set the correct policy for the
+             * PSK key slot. This limitation might go away in the future. */
+            if( ciphersuite_info->key_exchange != MBEDTLS_KEY_EXCHANGE_PSK ||
+                opt.min_version != MBEDTLS_SSL_MINOR_VERSION_3 )
+            {
+                mbedtls_printf( "opaque PSKs are only supported in conjunction with forcing TLS 1.2 and a PSK-only ciphersuite through the 'force_ciphersuite' option.\n" );
+                ret = 2;
+                goto usage;
+            }
+
+            /* Determine KDF algorithm the opaque PSK will be used in. */
+#if defined(MBEDTLS_SHA512_C)
+            if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
+                alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384);
+            else
+#endif /* MBEDTLS_SHA512_C */
+                alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256);
+        }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+    }
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    if( mbedtls_test_unhexify( cid, sizeof( cid ),
+                               opt.cid_val, &cid_len ) != 0 )
+    {
+        mbedtls_printf( "CID not valid\n" );
+        goto exit;
+    }
+
+    /* Keep CID settings for renegotiation unless
+     * specified otherwise. */
+    if( opt.cid_enabled_renego == DFL_CID_ENABLED_RENEGO )
+        opt.cid_enabled_renego = opt.cid_enabled;
+    if( opt.cid_val_renego == DFL_CID_VALUE_RENEGO )
+        opt.cid_val_renego = opt.cid_val;
+
+    if( mbedtls_test_unhexify( cid_renego, sizeof( cid_renego ),
+                               opt.cid_val_renego, &cid_renego_len ) != 0 )
+    {
+        mbedtls_printf( "CID not valid\n" );
+        goto exit;
+    }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_ECP_C)
+    if( opt.curves != NULL )
+    {
+        p = (char *) opt.curves;
+        i = 0;
+
+        if( strcmp( p, "none" ) == 0 )
+        {
+            curve_list[0] = MBEDTLS_ECP_DP_NONE;
+        }
+        else if( strcmp( p, "default" ) != 0 )
+        {
+            /* Leave room for a final NULL in curve list */
+            while( i < CURVE_LIST_SIZE - 1 && *p != '\0' )
+            {
+                q = p;
+
+                /* Terminate the current string */
+                while( *p != ',' && *p != '\0' )
+                    p++;
+                if( *p == ',' )
+                    *p++ = '\0';
+
+                if( ( curve_cur = mbedtls_ecp_curve_info_from_name( q ) ) != NULL )
+                {
+                    curve_list[i++] = curve_cur->grp_id;
+                }
+                else
+                {
+                    mbedtls_printf( "unknown curve %s\n", q );
+                    mbedtls_printf( "supported curves: " );
+                    for( curve_cur = mbedtls_ecp_curve_list();
+                         curve_cur->grp_id != MBEDTLS_ECP_DP_NONE;
+                         curve_cur++ )
+                    {
+                        mbedtls_printf( "%s ", curve_cur->name );
+                    }
+                    mbedtls_printf( "\n" );
+                    goto exit;
+                }
+            }
+
+            mbedtls_printf("Number of curves: %d\n", i );
+
+            if( i == CURVE_LIST_SIZE - 1 && *p != '\0' )
+            {
+                mbedtls_printf( "curves list too long, maximum %d",
+                                CURVE_LIST_SIZE - 1 );
+                goto exit;
+            }
+
+            curve_list[i] = MBEDTLS_ECP_DP_NONE;
+        }
+    }
+#endif /* MBEDTLS_ECP_C */
+
+#if defined(MBEDTLS_SSL_ALPN)
+    if( opt.alpn_string != NULL )
+    {
+        p = (char *) opt.alpn_string;
+        i = 0;
+
+        /* Leave room for a final NULL in alpn_list */
+        while( i < ALPN_LIST_SIZE - 1 && *p != '\0' )
+        {
+            alpn_list[i++] = p;
+
+            /* Terminate the current string and move on to next one */
+            while( *p != ',' && *p != '\0' )
+                p++;
+            if( *p == ',' )
+                *p++ = '\0';
+        }
+    }
+#endif /* MBEDTLS_SSL_ALPN */
+
+    /*
+     * 0. Initialize the RNG and the session data
+     */
+    mbedtls_printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    ret = rng_seed( &rng, opt.reproducible, pers );
+    if( ret != 0 )
+        goto exit;
+    mbedtls_printf( " ok\n" );
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    /*
+     * 1.1. Load the trusted CA
+     */
+    mbedtls_printf( "  . Loading the CA root certificate ..." );
+    fflush( stdout );
+
+    if( strcmp( opt.ca_path, "none" ) == 0 ||
+        strcmp( opt.ca_file, "none" ) == 0 )
+    {
+        ret = 0;
+    }
+    else
+#if defined(MBEDTLS_FS_IO)
+    if( strlen( opt.ca_path ) )
+        ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path );
+    else if( strlen( opt.ca_file ) )
+        ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file );
+    else
+#endif
+#if defined(MBEDTLS_CERTS_C)
+    {
+#if defined(MBEDTLS_PEM_PARSE_C)
+        for( i = 0; mbedtls_test_cas[i] != NULL; i++ )
+        {
+            ret = mbedtls_x509_crt_parse( &cacert,
+                                  (const unsigned char *) mbedtls_test_cas[i],
+                                  mbedtls_test_cas_len[i] );
+            if( ret != 0 )
+                break;
+        }
+        if( ret == 0 )
+#endif /* MBEDTLS_PEM_PARSE_C */
+        for( i = 0; mbedtls_test_cas_der[i] != NULL; i++ )
+        {
+            ret = mbedtls_x509_crt_parse_der( &cacert,
+                         (const unsigned char *) mbedtls_test_cas_der[i],
+                         mbedtls_test_cas_der_len[i] );
+            if( ret != 0 )
+                break;
+        }
+    }
+#else
+    {
+        ret = 1;
+        mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
+    }
+#endif /* MBEDTLS_CERTS_C */
+    if( ret < 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok (%d skipped)\n", ret );
+
+    /*
+     * 1.2. Load own certificate and private key
+     *
+     * (can be skipped if client authentication is not required)
+     */
+    mbedtls_printf( "  . Loading the client cert. and key..." );
+    fflush( stdout );
+
+    if( strcmp( opt.crt_file, "none" ) == 0 )
+        ret = 0;
+    else
+#if defined(MBEDTLS_FS_IO)
+    if( strlen( opt.crt_file ) )
+        ret = mbedtls_x509_crt_parse_file( &clicert, opt.crt_file );
+    else
+#endif
+#if defined(MBEDTLS_CERTS_C)
+        ret = mbedtls_x509_crt_parse( &clicert,
+                (const unsigned char *) mbedtls_test_cli_crt,
+                mbedtls_test_cli_crt_len );
+#else
+    {
+        ret = 1;
+        mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
+    }
+#endif
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+    if( strcmp( opt.key_file, "none" ) == 0 )
+        ret = 0;
+    else
+#if defined(MBEDTLS_FS_IO)
+    if( strlen( opt.key_file ) )
+        ret = mbedtls_pk_parse_keyfile( &pkey, opt.key_file, opt.key_pwd );
+    else
+#endif
+#if defined(MBEDTLS_CERTS_C)
+        ret = mbedtls_pk_parse_key( &pkey,
+                (const unsigned char *) mbedtls_test_cli_key,
+                mbedtls_test_cli_key_len, NULL, 0 );
+#else
+    {
+        ret = 1;
+        mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
+    }
+#endif
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_pk_parse_key returned -0x%x\n\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if( opt.key_opaque != 0 )
+    {
+        if( ( ret = mbedtls_pk_wrap_as_opaque( &pkey, &key_slot,
+                                               PSA_ALG_SHA_256 ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  !  "
+                            "mbedtls_pk_wrap_as_opaque returned -0x%x\n\n", (unsigned int)  -ret );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+    mbedtls_printf( " ok (key type: %s)\n", mbedtls_pk_get_name( &pkey ) );
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+    /*
+     * 2. Start the connection
+     */
+    if( opt.server_addr == NULL)
+        opt.server_addr = opt.server_name;
+
+    mbedtls_printf( "  . Connecting to %s/%s/%s...",
+            opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM ? "tcp" : "udp",
+            opt.server_addr, opt.server_port );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_connect( &server_fd,
+                       opt.server_addr, opt.server_port,
+                       opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM ?
+                       MBEDTLS_NET_PROTO_TCP : MBEDTLS_NET_PROTO_UDP ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_connect returned -0x%x\n\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+    if( opt.nbio > 0 )
+        ret = mbedtls_net_set_nonblock( &server_fd );
+    else
+        ret = mbedtls_net_set_block( &server_fd );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! net_set_(non)block() returned -0x%x\n\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 3. Setup stuff
+     */
+    mbedtls_printf( "  . Setting up the SSL/TLS structure..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                    MBEDTLS_SSL_IS_CLIENT,
+                    opt.transport,
+                    MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned -0x%x\n\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    /* The default algorithms profile disables SHA-1, but our tests still
+       rely on it heavily. */
+    if( opt.allow_sha1 > 0 )
+    {
+        crt_profile_for_test.allowed_mds |= MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 );
+        mbedtls_ssl_conf_cert_profile( &conf, &crt_profile_for_test );
+        mbedtls_ssl_conf_sig_hashes( &conf, ssl_sig_hashes_for_test );
+    }
+
+    if( opt.context_crt_cb == 0 )
+        mbedtls_ssl_conf_verify( &conf, my_verify, NULL );
+
+    memset( peer_crt_info, 0, sizeof( peer_crt_info ) );
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    if( opt.cid_enabled == 1 || opt.cid_enabled_renego == 1 )
+    {
+        if( opt.cid_enabled == 1        &&
+            opt.cid_enabled_renego == 1 &&
+            cid_len != cid_renego_len )
+        {
+            mbedtls_printf( "CID length must not change during renegotiation\n" );
+            goto usage;
+        }
+
+        if( opt.cid_enabled == 1 )
+            ret = mbedtls_ssl_conf_cid( &conf, cid_len,
+                                        MBEDTLS_SSL_UNEXPECTED_CID_IGNORE );
+        else
+            ret = mbedtls_ssl_conf_cid( &conf, cid_renego_len,
+                                        MBEDTLS_SSL_UNEXPECTED_CID_IGNORE );
+
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_cid_len returned -%#04x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+    if( opt.auth_mode != DFL_AUTH_MODE )
+        mbedtls_ssl_conf_authmode( &conf, opt.auth_mode );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+    if( opt.hs_to_min != DFL_HS_TO_MIN || opt.hs_to_max != DFL_HS_TO_MAX )
+        mbedtls_ssl_conf_handshake_timeout( &conf, opt.hs_to_min,
+                                            opt.hs_to_max );
+
+    if( opt.dgram_packing != DFL_DGRAM_PACKING )
+        mbedtls_ssl_set_datagram_packing( &ssl, opt.dgram_packing );
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+    if( ( ret = mbedtls_ssl_conf_max_frag_len( &conf, opt.mfl_code ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_max_frag_len returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+    const mbedtls_ssl_srtp_profile forced_profile[] =
+                                { opt.force_srtp_profile, MBEDTLS_TLS_SRTP_UNSET };
+    if( opt.use_srtp == 1 )
+    {
+        if( opt.force_srtp_profile != 0 )
+        {
+            ret = mbedtls_ssl_conf_dtls_srtp_protection_profiles ( &conf, forced_profile );
+        }
+        else
+        {
+            ret = mbedtls_ssl_conf_dtls_srtp_protection_profiles ( &conf, default_profiles );
+        }
+
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  ! "
+                            "mbedtls_ssl_conf_dtls_srtp_protection_profiles returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+
+    }
+    else if( opt.force_srtp_profile != 0 )
+    {
+        mbedtls_printf( " failed\n  ! must enable use_srtp to force srtp profile\n\n" );
+        goto exit;
+    }
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+    if( opt.trunc_hmac != DFL_TRUNC_HMAC )
+        mbedtls_ssl_conf_truncated_hmac( &conf, opt.trunc_hmac );
+#endif
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+    if( opt.extended_ms != DFL_EXTENDED_MS )
+        mbedtls_ssl_conf_extended_master_secret( &conf, opt.extended_ms );
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+    if( opt.etm != DFL_ETM )
+        mbedtls_ssl_conf_encrypt_then_mac( &conf, opt.etm );
+#endif
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+    if( opt.eap_tls != 0 )
+    {
+        mbedtls_ssl_conf_export_keys_ext_cb( &conf, eap_tls_key_derivation,
+                                             &eap_tls_keying );
+    }
+    else if( opt.nss_keylog != 0 )
+    {
+        mbedtls_ssl_conf_export_keys_ext_cb( &conf,
+                                             nss_keylog_export,
+                                             NULL );
+    }
+#if defined( MBEDTLS_SSL_DTLS_SRTP )
+    else if( opt.use_srtp != 0 )
+    {
+        mbedtls_ssl_conf_export_keys_ext_cb( &conf, dtls_srtp_key_derivation,
+                                             &dtls_srtp_keying );
+    }
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
+    if( opt.recsplit != DFL_RECSPLIT )
+        mbedtls_ssl_conf_cbc_record_splitting( &conf, opt.recsplit
+                                  ? MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED
+                                  : MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED );
+#endif
+
+#if defined(MBEDTLS_DHM_C)
+    if( opt.dhmlen != DFL_DHMLEN )
+        mbedtls_ssl_conf_dhm_min_bitlen( &conf, opt.dhmlen );
+#endif
+
+#if defined(MBEDTLS_SSL_ALPN)
+    if( opt.alpn_string != NULL )
+        if( ( ret = mbedtls_ssl_conf_alpn_protocols( &conf, alpn_list ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_alpn_protocols returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+#endif
+
+    if (opt.reproducible)
+    {
+#if defined(MBEDTLS_HAVE_TIME)
+#if defined(MBEDTLS_PLATFORM_TIME_ALT)
+        mbedtls_platform_set_time( dummy_constant_time );
+#else
+        fprintf( stderr, "Warning: reproducible option used without constant time\n" );
+#endif
+#endif  /* MBEDTLS_HAVE_TIME */
+    }
+    mbedtls_ssl_conf_rng( &conf, rng_get, &rng );
+    mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+
+    mbedtls_ssl_conf_read_timeout( &conf, opt.read_timeout );
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+    mbedtls_ssl_conf_session_tickets( &conf, opt.tickets );
+#endif
+
+    if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
+        mbedtls_ssl_conf_ciphersuites( &conf, opt.force_ciphersuite );
+
+#if defined(MBEDTLS_ARC4_C)
+    if( opt.arc4 != DFL_ARC4 )
+        mbedtls_ssl_conf_arc4_support( &conf, opt.arc4 );
+#endif
+
+    if( opt.allow_legacy != DFL_ALLOW_LEGACY )
+        mbedtls_ssl_conf_legacy_renegotiation( &conf, opt.allow_legacy );
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+    mbedtls_ssl_conf_renegotiation( &conf, opt.renegotiation );
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    if( strcmp( opt.ca_path, "none" ) != 0 &&
+        strcmp( opt.ca_file, "none" ) != 0 )
+    {
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+        if( opt.ca_callback != 0 )
+            mbedtls_ssl_conf_ca_cb( &conf, ca_callback, &cacert );
+        else
+#endif
+            mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
+    }
+    if( strcmp( opt.crt_file, "none" ) != 0 &&
+        strcmp( opt.key_file, "none" ) != 0 )
+    {
+        if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &clicert, &pkey ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_own_cert returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+    }
+#endif  /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_ECP_C)
+    if( opt.curves != NULL &&
+        strcmp( opt.curves, "default" ) != 0 )
+    {
+        mbedtls_ssl_conf_curves( &conf, curve_list );
+    }
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if( opt.psk_opaque != 0 )
+    {
+        key_attributes = psa_key_attributes_init();
+        psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
+        psa_set_key_algorithm( &key_attributes, alg );
+        psa_set_key_type( &key_attributes, PSA_KEY_TYPE_DERIVE );
+
+        status = psa_import_key( &key_attributes, psk, psk_len, &slot );
+        if( status != PSA_SUCCESS )
+        {
+            ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
+            goto exit;
+        }
+
+        if( ( ret = mbedtls_ssl_conf_psk_opaque( &conf, slot,
+                                  (const unsigned char *) opt.psk_identity,
+                                  strlen( opt.psk_identity ) ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_psk_opaque returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+    }
+    else
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+    if( psk_len > 0 )
+    {
+        ret = mbedtls_ssl_conf_psk( &conf, psk, psk_len,
+                             (const unsigned char *) opt.psk_identity,
+                             strlen( opt.psk_identity ) );
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_psk returned %d\n\n", ret );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
+
+    if( opt.min_version != DFL_MIN_VERSION )
+        mbedtls_ssl_conf_min_version( &conf, MBEDTLS_SSL_MAJOR_VERSION_3,
+                                      opt.min_version );
+
+    if( opt.max_version != DFL_MAX_VERSION )
+        mbedtls_ssl_conf_max_version( &conf, MBEDTLS_SSL_MAJOR_VERSION_3,
+                                      opt.max_version );
+
+#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
+    if( opt.fallback != DFL_FALLBACK )
+        mbedtls_ssl_conf_fallback( &conf, opt.fallback );
+#endif
+
+    if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned -0x%x\n\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+    if( opt.ecjpake_pw != DFL_ECJPAKE_PW )
+    {
+        if( ( ret = mbedtls_ssl_set_hs_ecjpake_password( &ssl,
+                        (const unsigned char *) opt.ecjpake_pw,
+                                        strlen( opt.ecjpake_pw ) ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hs_ecjpake_password returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+    }
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    if( opt.context_crt_cb == 1 )
+        mbedtls_ssl_set_verify( &ssl, my_verify, NULL );
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+    io_ctx.ssl = &ssl;
+    io_ctx.net = &server_fd;
+    mbedtls_ssl_set_bio( &ssl, &io_ctx, send_cb, recv_cb,
+                         opt.nbio == 0 ? recv_timeout_cb : NULL );
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+    {
+        if( ( ret = mbedtls_ssl_set_cid( &ssl, opt.cid_enabled,
+                                         cid, cid_len ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_set_cid returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+    if( opt.dtls_mtu != DFL_DTLS_MTU )
+        mbedtls_ssl_set_mtu( &ssl, opt.dtls_mtu );
+#endif
+
+#if defined(MBEDTLS_TIMING_C)
+    mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
+                                            mbedtls_timing_get_delay );
+#endif
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    if( opt.ec_max_ops != DFL_EC_MAX_OPS )
+        mbedtls_ecp_set_max_ops( opt.ec_max_ops );
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+    if( opt.use_srtp != 0 && strlen( opt.mki ) != 0 )
+    {
+        if( mbedtls_test_unhexify( mki, sizeof( mki ),
+                                   opt.mki,&mki_len ) != 0 )
+        {
+            mbedtls_printf( "mki value not valid hex\n" );
+            goto exit;
+        }
+
+        mbedtls_ssl_conf_srtp_mki_value_supported( &conf, MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED );
+        if( ( ret = mbedtls_ssl_dtls_srtp_set_mki_value( &ssl, mki,
+                                                         (uint16_t) strlen( opt.mki ) / 2 ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_dtls_srtp_set_mki_value returned %d\n\n", ret );
+            goto exit;
+        }
+    }
+#endif
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 4. Handshake
+     */
+    mbedtls_printf( "  . Performing the SSL/TLS handshake..." );
+    fflush( stdout );
+
+    while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
+            ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
+            ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n",
+                            (unsigned int) -ret );
+            if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED )
+                mbedtls_printf(
+                    "    Unable to verify the server's certificate. "
+                        "Either it is invalid,\n"
+                    "    or you didn't set ca_file or ca_path "
+                        "to an appropriate value.\n"
+                    "    Alternatively, you may want to use "
+                        "auth_mode=optional for testing purposes.\n" );
+            mbedtls_printf( "\n" );
+            goto exit;
+        }
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+        if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+            continue;
+#endif
+
+        /* For event-driven IO, wait for socket to become available */
+        if( opt.event == 1 /* level triggered IO */ )
+        {
+#if defined(MBEDTLS_TIMING_C)
+            ret = idle( &server_fd, &timer, ret );
+#else
+            ret = idle( &server_fd, ret );
+#endif
+            if( ret != 0 )
+                goto exit;
+        }
+    }
+
+    mbedtls_printf( " ok\n    [ Protocol is %s ]\n    [ Ciphersuite is %s ]\n",
+                    mbedtls_ssl_get_version( &ssl ),
+                    mbedtls_ssl_get_ciphersuite( &ssl ) );
+
+    if( ( ret = mbedtls_ssl_get_record_expansion( &ssl ) ) >= 0 )
+        mbedtls_printf( "    [ Record expansion is %d ]\n", ret );
+    else
+        mbedtls_printf( "    [ Record expansion is unknown (compression) ]\n" );
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+    mbedtls_printf( "    [ Maximum input fragment length is %u ]\n",
+                    (unsigned int) mbedtls_ssl_get_input_max_frag_len( &ssl ) );
+    mbedtls_printf( "    [ Maximum output fragment length is %u ]\n",
+                    (unsigned int) mbedtls_ssl_get_output_max_frag_len( &ssl ) );
+#endif
+
+#if defined(MBEDTLS_SSL_ALPN)
+    if( opt.alpn_string != NULL )
+    {
+        const char *alp = mbedtls_ssl_get_alpn_protocol( &ssl );
+        mbedtls_printf( "    [ Application Layer Protocol is %s ]\n",
+                alp ? alp : "(none)" );
+    }
+#endif
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+    if( opt.eap_tls != 0  )
+    {
+        size_t j = 0;
+
+        if( ( ret = mbedtls_ssl_tls_prf( eap_tls_keying.tls_prf_type,
+                                         eap_tls_keying.master_secret,
+                                         sizeof( eap_tls_keying.master_secret ),
+                                         eap_tls_label,
+                                         eap_tls_keying.randbytes,
+                                         sizeof( eap_tls_keying.randbytes ),
+                                         eap_tls_keymaterial,
+                                         sizeof( eap_tls_keymaterial ) ) )
+                                         != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+
+        mbedtls_printf( "    EAP-TLS key material is:" );
+        for( j = 0; j < sizeof( eap_tls_keymaterial ); j++ )
+        {
+            if( j % 8 == 0 )
+                mbedtls_printf("\n    ");
+            mbedtls_printf("%02x ", eap_tls_keymaterial[j] );
+        }
+        mbedtls_printf("\n");
+
+        if( ( ret = mbedtls_ssl_tls_prf( eap_tls_keying.tls_prf_type, NULL, 0,
+                                         eap_tls_label,
+                                         eap_tls_keying.randbytes,
+                                         sizeof( eap_tls_keying.randbytes ),
+                                         eap_tls_iv,
+                                         sizeof( eap_tls_iv ) ) ) != 0 )
+         {
+             mbedtls_printf( " failed\n  ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
+                             (unsigned int) -ret );
+             goto exit;
+         }
+
+        mbedtls_printf( "    EAP-TLS IV is:" );
+        for( j = 0; j < sizeof( eap_tls_iv ); j++ )
+        {
+            if( j % 8 == 0 )
+                mbedtls_printf("\n    ");
+            mbedtls_printf("%02x ", eap_tls_iv[j] );
+        }
+        mbedtls_printf("\n");
+    }
+
+#if defined( MBEDTLS_SSL_DTLS_SRTP )
+    else if( opt.use_srtp != 0  )
+    {
+        size_t j = 0;
+        mbedtls_dtls_srtp_info dtls_srtp_negotiation_result;
+        mbedtls_ssl_get_dtls_srtp_negotiation_result( &ssl, &dtls_srtp_negotiation_result );
+
+        if( dtls_srtp_negotiation_result.chosen_dtls_srtp_profile
+                                == MBEDTLS_TLS_SRTP_UNSET )
+        {
+            mbedtls_printf( "    Unable to negotiate "
+                            "the use of DTLS-SRTP\n" );
+        }
+        else
+        {
+            if( ( ret = mbedtls_ssl_tls_prf( dtls_srtp_keying.tls_prf_type,
+                                             dtls_srtp_keying.master_secret,
+                                             sizeof( dtls_srtp_keying.master_secret ),
+                                             dtls_srtp_label,
+                                             dtls_srtp_keying.randbytes,
+                                             sizeof( dtls_srtp_keying.randbytes ),
+                                             dtls_srtp_key_material,
+                                             sizeof( dtls_srtp_key_material ) ) )
+                                             != 0 )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
+                                (unsigned int) -ret );
+                goto exit;
+            }
+
+            mbedtls_printf( "    DTLS-SRTP key material is:" );
+            for( j = 0; j < sizeof( dtls_srtp_key_material ); j++ )
+            {
+                if( j % 8 == 0 )
+                    mbedtls_printf( "\n    " );
+                mbedtls_printf( "%02x ", dtls_srtp_key_material[j] );
+            }
+            mbedtls_printf( "\n" );
+
+            /* produce a less readable output used to perform automatic checks
+             * - compare client and server output
+             * - interop test with openssl which client produces this kind of output
+             */
+            mbedtls_printf( "    Keying material: " );
+            for( j = 0; j < sizeof( dtls_srtp_key_material ); j++ )
+            {
+                mbedtls_printf( "%02X", dtls_srtp_key_material[j] );
+            }
+            mbedtls_printf( "\n" );
+
+            if ( dtls_srtp_negotiation_result.mki_len > 0 )
+            {
+                mbedtls_printf( "    DTLS-SRTP mki value: " );
+                for( j = 0; j < dtls_srtp_negotiation_result.mki_len; j++ )
+                {
+                    mbedtls_printf( "%02X", dtls_srtp_negotiation_result.mki_value[j] );
+                }
+            }
+            else
+            {
+                mbedtls_printf( "    DTLS-SRTP no mki value negotiated" );
+            }
+            mbedtls_printf( "\n" );
+        }
+    }
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+    if( opt.reconnect != 0 )
+    {
+        mbedtls_printf("  . Saving session for reuse..." );
+        fflush( stdout );
+
+        if( opt.reco_mode == 1 )
+        {
+            /* free any previously saved data */
+            if( session_data != NULL )
+            {
+                mbedtls_platform_zeroize( session_data, session_data_len );
+                mbedtls_free( session_data );
+                session_data = NULL;
+            }
+
+            /* get size of the buffer needed */
+            mbedtls_ssl_session_save( mbedtls_ssl_get_session_pointer( &ssl ),
+                                      NULL, 0, &session_data_len );
+            session_data = mbedtls_calloc( 1, session_data_len );
+            if( session_data == NULL )
+            {
+                mbedtls_printf( " failed\n  ! alloc %u bytes for session data\n",
+                                (unsigned) session_data_len );
+                ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
+                goto exit;
+            }
+
+            /* actually save session data */
+            if( ( ret = mbedtls_ssl_session_save( mbedtls_ssl_get_session_pointer( &ssl ),
+                                                  session_data, session_data_len,
+                                                  &session_data_len ) ) != 0 )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_session_saved returned -0x%04x\n\n",
+                                (unsigned int) -ret );
+                goto exit;
+            }
+        }
+        else
+        {
+            if( ( ret = mbedtls_ssl_get_session( &ssl, &saved_session ) ) != 0 )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_get_session returned -0x%x\n\n",
+                                (unsigned int) -ret );
+                goto exit;
+            }
+        }
+
+        mbedtls_printf( " ok\n" );
+
+        if( opt.reco_mode == 1 )
+        {
+            mbedtls_printf( "    [ Saved %u bytes of session data]\n",
+                            (unsigned) session_data_len );
+        }
+    }
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    /*
+     * 5. Verify the server certificate
+     */
+    mbedtls_printf( "  . Verifying peer X.509 certificate..." );
+
+    if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
+    {
+        char vrfy_buf[512];
+
+        mbedtls_printf( " failed\n" );
+
+        mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ),
+                                      "  ! ", flags );
+
+        mbedtls_printf( "%s\n", vrfy_buf );
+    }
+    else
+        mbedtls_printf( " ok\n" );
+
+    mbedtls_printf( "  . Peer certificate information    ...\n" );
+    mbedtls_printf( "%s\n", peer_crt_info );
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    ret = report_cid_usage( &ssl, "initial handshake" );
+    if( ret != 0 )
+        goto exit;
+
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+    {
+        if( ( ret = mbedtls_ssl_set_cid( &ssl, opt.cid_enabled_renego,
+                                         cid_renego,
+                                         cid_renego_len ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_set_cid returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+    if( opt.renegotiate )
+    {
+        /*
+         * Perform renegotiation (this must be done when the server is waiting
+         * for input from our side).
+         */
+        mbedtls_printf( "  . Performing renegotiation..." );
+        fflush( stdout );
+        while( ( ret = mbedtls_ssl_renegotiate( &ssl ) ) != 0 )
+        {
+            if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
+                ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
+                ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_renegotiate returned %d\n\n",
+                                ret );
+                goto exit;
+            }
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+            if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+                continue;
+#endif
+
+            /* For event-driven IO, wait for socket to become available */
+            if( opt.event == 1 /* level triggered IO */ )
+            {
+#if defined(MBEDTLS_TIMING_C)
+                idle( &server_fd, &timer, ret );
+#else
+                idle( &server_fd, ret );
+#endif
+            }
+
+        }
+        mbedtls_printf( " ok\n" );
+    }
+#endif /* MBEDTLS_SSL_RENEGOTIATION */
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    ret = report_cid_usage( &ssl, "after renegotiation" );
+    if( ret != 0 )
+        goto exit;
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+    /*
+     * 6. Write the GET request
+     */
+    retry_left = opt.max_resend;
+send_request:
+    mbedtls_printf( "  > Write to server:" );
+    fflush( stdout );
+
+    len = mbedtls_snprintf( (char *) buf, sizeof( buf ) - 1, GET_REQUEST,
+                            opt.request_page );
+    tail_len = (int) strlen( GET_REQUEST_END );
+
+    /* Add padding to GET request to reach opt.request_size in length */
+    if( opt.request_size != DFL_REQUEST_SIZE &&
+        len + tail_len < opt.request_size )
+    {
+        memset( buf + len, 'A', opt.request_size - len - tail_len );
+        len += opt.request_size - len - tail_len;
+    }
+
+    strncpy( (char *) buf + len, GET_REQUEST_END, sizeof( buf ) - len - 1 );
+    len += tail_len;
+
+    /* Truncate if request size is smaller than the "natural" size */
+    if( opt.request_size != DFL_REQUEST_SIZE &&
+        len > opt.request_size )
+    {
+        len = opt.request_size;
+
+        /* Still end with \r\n unless that's really not possible */
+        if( len >= 2 ) buf[len - 2] = '\r';
+        if( len >= 1 ) buf[len - 1] = '\n';
+    }
+
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM )
+    {
+        written = 0;
+        frags = 0;
+
+        do
+        {
+            while( ( ret = mbedtls_ssl_write( &ssl, buf + written,
+                                              len - written ) ) < 0 )
+            {
+                if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
+                    ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
+                    ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+                {
+                    mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned -0x%x\n\n",
+                                    (unsigned int) -ret );
+                    goto exit;
+                }
+
+                /* For event-driven IO, wait for socket to become available */
+                if( opt.event == 1 /* level triggered IO */ )
+                {
+#if defined(MBEDTLS_TIMING_C)
+                    idle( &server_fd, &timer, ret );
+#else
+                    idle( &server_fd, ret );
+#endif
+                }
+            }
+
+            frags++;
+            written += ret;
+        }
+        while( written < len );
+    }
+    else /* Not stream, so datagram */
+    {
+        while( 1 )
+        {
+            ret = mbedtls_ssl_write( &ssl, buf, len );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+            if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+                continue;
+#endif
+
+            if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
+                ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+                break;
+
+            /* For event-driven IO, wait for socket to become available */
+            if( opt.event == 1 /* level triggered IO */ )
+            {
+#if defined(MBEDTLS_TIMING_C)
+                idle( &server_fd, &timer, ret );
+#else
+                idle( &server_fd, ret );
+#endif
+            }
+        }
+
+        if( ret < 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+
+        frags = 1;
+        written = ret;
+
+        if( written < len )
+        {
+            mbedtls_printf( " warning\n  ! request didn't fit into single datagram and "
+                            "was truncated to size %u", (unsigned) written );
+        }
+    }
+
+    buf[written] = '\0';
+    mbedtls_printf( " %d bytes written in %d fragments\n\n%s\n",
+                    written, frags, (char *) buf );
+
+    /* Send a non-empty request if request_size == 0 */
+    if ( len == 0 )
+    {
+        opt.request_size = DFL_REQUEST_SIZE;
+        goto send_request;
+    }
+
+    /*
+     * 7. Read the HTTP response
+     */
+    mbedtls_printf( "  < Read from server:" );
+    fflush( stdout );
+
+    /*
+     * TLS and DTLS need different reading styles (stream vs datagram)
+     */
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM )
+    {
+        do
+        {
+            len = sizeof( buf ) - 1;
+            memset( buf, 0, sizeof( buf ) );
+            ret = mbedtls_ssl_read( &ssl, buf, len );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+            if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+                continue;
+#endif
+
+            if( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+                ret == MBEDTLS_ERR_SSL_WANT_WRITE )
+            {
+                /* For event-driven IO, wait for socket to become available */
+                if( opt.event == 1 /* level triggered IO */ )
+                {
+#if defined(MBEDTLS_TIMING_C)
+                    idle( &server_fd, &timer, ret );
+#else
+                    idle( &server_fd, ret );
+#endif
+                }
+                continue;
+            }
+
+            if( ret <= 0 )
+            {
+                switch( ret )
+                {
+                    case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                        mbedtls_printf( " connection was closed gracefully\n" );
+                        ret = 0;
+                        goto close_notify;
+
+                    case 0:
+                    case MBEDTLS_ERR_NET_CONN_RESET:
+                        mbedtls_printf( " connection was reset by peer\n" );
+                        ret = 0;
+                        goto reconnect;
+
+                    default:
+                        mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n",
+                                        (unsigned int) -ret );
+                        goto exit;
+                }
+            }
+
+            len = ret;
+            buf[len] = '\0';
+            mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
+
+            /* End of message should be detected according to the syntax of the
+             * application protocol (eg HTTP), just use a dummy test here. */
+            if( ret > 0 && buf[len-1] == '\n' )
+            {
+                ret = 0;
+                break;
+            }
+        }
+        while( 1 );
+    }
+    else /* Not stream, so datagram */
+    {
+        len = sizeof( buf ) - 1;
+        memset( buf, 0, sizeof( buf ) );
+
+        while( 1 )
+        {
+            ret = mbedtls_ssl_read( &ssl, buf, len );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+            if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+                continue;
+#endif
+
+            if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
+                ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+                break;
+
+            /* For event-driven IO, wait for socket to become available */
+            if( opt.event == 1 /* level triggered IO */ )
+            {
+#if defined(MBEDTLS_TIMING_C)
+                idle( &server_fd, &timer, ret );
+#else
+                idle( &server_fd, ret );
+#endif
+            }
+        }
+
+        if( ret <= 0 )
+        {
+            switch( ret )
+            {
+                case MBEDTLS_ERR_SSL_TIMEOUT:
+                    mbedtls_printf( " timeout\n" );
+                    if( retry_left-- > 0 )
+                        goto send_request;
+                    goto exit;
+
+                case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                    mbedtls_printf( " connection was closed gracefully\n" );
+                    ret = 0;
+                    goto close_notify;
+
+                default:
+                    mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n", (unsigned int) -ret );
+                    goto exit;
+            }
+        }
+
+        len = ret;
+        buf[len] = '\0';
+        mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
+        ret = 0;
+    }
+
+    /*
+     * 7b. Simulate hard reset and reconnect from same port?
+     */
+    if( opt.reconnect_hard != 0 )
+    {
+        opt.reconnect_hard = 0;
+
+        mbedtls_printf( "  . Restarting connection from same port..." );
+        fflush( stdout );
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+        memset( peer_crt_info, 0, sizeof( peer_crt_info ) );
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+        if( ( ret = mbedtls_ssl_session_reset( &ssl ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_session_reset returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+
+        while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
+        {
+            if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
+                ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
+                ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n",
+                                (unsigned int) -ret );
+                goto exit;
+            }
+
+            /* For event-driven IO, wait for socket to become available */
+            if( opt.event == 1 /* level triggered IO */ )
+            {
+#if defined(MBEDTLS_TIMING_C)
+                idle( &server_fd, &timer, ret );
+#else
+                idle( &server_fd, ret );
+#endif
+            }
+        }
+
+        mbedtls_printf( " ok\n" );
+
+        goto send_request;
+    }
+
+    /*
+     * 7c. Simulate serialize/deserialize and go back to data exchange
+     */
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+    if( opt.serialize != 0 )
+    {
+        size_t buf_len;
+
+        mbedtls_printf( "  . Serializing live connection..." );
+
+        ret = mbedtls_ssl_context_save( &ssl, NULL, 0, &buf_len );
+        if( ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_context_save returned "
+                            "-0x%x\n\n", (unsigned int) -ret );
+
+            goto exit;
+        }
+
+        if( ( context_buf = mbedtls_calloc( 1, buf_len ) ) == NULL )
+        {
+            mbedtls_printf( " failed\n  ! Couldn't allocate buffer for "
+                            "serialized context" );
+
+            goto exit;
+        }
+        context_buf_len = buf_len;
+
+        if( ( ret = mbedtls_ssl_context_save( &ssl, context_buf,
+                                              buf_len, &buf_len ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_context_save returned "
+                            "-0x%x\n\n", (unsigned int) -ret );
+
+            goto exit;
+        }
+
+        mbedtls_printf( " ok\n" );
+
+        /* Save serialized context to the 'opt.context_file' as a base64 code */
+        if( 0 < strlen( opt.context_file ) )
+        {
+            FILE *b64_file;
+            uint8_t *b64_buf;
+            size_t b64_len;
+
+            mbedtls_printf( "  . Save serialized context to a file... " );
+
+            mbedtls_base64_encode( NULL, 0, &b64_len, context_buf, buf_len );
+
+            if( ( b64_buf = mbedtls_calloc( 1, b64_len ) ) == NULL )
+            {
+                mbedtls_printf( "failed\n  ! Couldn't allocate buffer for "
+                                "the base64 code\n" );
+                goto exit;
+            }
+
+            if( ( ret = mbedtls_base64_encode( b64_buf, b64_len, &b64_len,
+                                               context_buf, buf_len ) ) != 0 )
+            {
+                mbedtls_printf( "failed\n  ! mbedtls_base64_encode returned "
+                            "-0x%x\n", (unsigned int) -ret );
+                mbedtls_free( b64_buf );
+                goto exit;
+            }
+
+            if( ( b64_file = fopen( opt.context_file, "w" ) ) == NULL )
+            {
+                mbedtls_printf( "failed\n  ! Cannot open '%s' for writing.\n",
+                                opt.context_file );
+                mbedtls_free( b64_buf );
+                goto exit;
+            }
+
+            if( b64_len != fwrite( b64_buf, 1, b64_len, b64_file ) )
+            {
+                mbedtls_printf( "failed\n  ! fwrite(%ld bytes) failed\n",
+                                (long) b64_len );
+                mbedtls_free( b64_buf );
+                fclose( b64_file );
+                goto exit;
+            }
+
+            mbedtls_free( b64_buf );
+            fclose( b64_file );
+
+            mbedtls_printf( "ok\n" );
+        }
+
+        if( opt.serialize == 1 )
+        {
+            /* nothing to do here, done by context_save() already */
+            mbedtls_printf( "  . Context has been reset... ok\n" );
+        }
+
+        if( opt.serialize == 2 )
+        {
+            mbedtls_printf( "  . Freeing and reinitializing context..." );
+
+            mbedtls_ssl_free( &ssl );
+
+            mbedtls_ssl_init( &ssl );
+
+            if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned "
+                                "-0x%x\n\n", (unsigned int) -ret );
+                goto exit;
+            }
+
+            if( opt.nbio == 2 )
+                mbedtls_ssl_set_bio( &ssl, &server_fd, delayed_send,
+                                     delayed_recv, NULL );
+            else
+                mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send,
+                            mbedtls_net_recv,
+                            opt.nbio == 0 ? mbedtls_net_recv_timeout : NULL );
+
+#if defined(MBEDTLS_TIMING_C)
+                mbedtls_ssl_set_timer_cb( &ssl, &timer,
+                                          mbedtls_timing_set_delay,
+                                          mbedtls_timing_get_delay );
+#endif /* MBEDTLS_TIMING_C */
+
+            mbedtls_printf( " ok\n" );
+        }
+
+        mbedtls_printf( "  . Deserializing connection..." );
+
+        if( ( ret = mbedtls_ssl_context_load( &ssl, context_buf,
+                                              buf_len ) ) != 0 )
+        {
+            mbedtls_printf( "failed\n  ! mbedtls_ssl_context_load returned "
+                            "-0x%x\n\n", (unsigned int) -ret );
+
+            goto exit;
+        }
+
+        mbedtls_free( context_buf );
+        context_buf = NULL;
+        context_buf_len = 0;
+
+        mbedtls_printf( " ok\n" );
+    }
+#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */
+
+    /*
+     * 7d. Continue doing data exchanges?
+     */
+    if( --opt.exchanges > 0 )
+        goto send_request;
+
+    /*
+     * 8. Done, cleanly close the connection
+     */
+close_notify:
+    mbedtls_printf( "  . Closing the connection..." );
+    fflush( stdout );
+
+    /*
+     * Most of the time sending a close_notify before closing is the right
+     * thing to do. However, when the server already knows how many messages
+     * are expected and closes the connection by itself, this alert becomes
+     * redundant. Sometimes with DTLS this redundancy becomes a problem by
+     * leading to a race condition where the server might close the connection
+     * before seeing the alert, and since UDP is connection-less when the
+     * alert arrives it will be seen as a new connection, which will fail as
+     * the alert is clearly not a valid ClientHello. This may cause spurious
+     * failures in tests that use DTLS and resumption with ssl_server2 in
+     * ssl-opt.sh, avoided by enabling skip_close_notify client-side.
+     */
+    if( opt.skip_close_notify == 0 )
+    {
+        /* No error checking, the connection might be closed already */
+        do ret = mbedtls_ssl_close_notify( &ssl );
+        while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+        ret = 0;
+    }
+
+    mbedtls_printf( " done\n" );
+
+    /*
+     * 9. Reconnect?
+     */
+reconnect:
+    if( opt.reconnect != 0 )
+    {
+        --opt.reconnect;
+
+        mbedtls_net_free( &server_fd );
+
+#if defined(MBEDTLS_TIMING_C)
+        if( opt.reco_delay > 0 )
+            mbedtls_net_usleep( 1000000 * opt.reco_delay );
+#endif
+
+        mbedtls_printf( "  . Reconnecting with saved session..." );
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+        memset( peer_crt_info, 0, sizeof( peer_crt_info ) );
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+        if( ( ret = mbedtls_ssl_session_reset( &ssl ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_session_reset returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+
+        if( opt.reco_mode == 1 )
+        {
+            if( ( ret = mbedtls_ssl_session_load( &saved_session,
+                                                  session_data,
+                                                  session_data_len ) ) != 0 )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_session_load returned -0x%x\n\n",
+                                (unsigned int) -ret );
+                goto exit;
+            }
+        }
+
+        if( ( ret = mbedtls_ssl_set_session( &ssl, &saved_session ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_set_session returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+
+        if( ( ret = mbedtls_net_connect( &server_fd,
+                        opt.server_addr, opt.server_port,
+                        opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM ?
+                        MBEDTLS_NET_PROTO_TCP : MBEDTLS_NET_PROTO_UDP ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_net_connect returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+
+        if( opt.nbio > 0 )
+            ret = mbedtls_net_set_nonblock( &server_fd );
+        else
+            ret = mbedtls_net_set_block( &server_fd );
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  ! net_set_(non)block() returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+
+        while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
+        {
+            if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
+                ret != MBEDTLS_ERR_SSL_WANT_WRITE &&
+                ret != MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n",
+                                (unsigned int) -ret );
+                goto exit;
+            }
+        }
+
+        mbedtls_printf( " ok\n" );
+
+        goto send_request;
+    }
+
+    /*
+     * Cleanup and exit
+     */
+exit:
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf("Last error was: -0x%X - %s\n\n", (unsigned int) -ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( &server_fd );
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    mbedtls_x509_crt_free( &clicert );
+    mbedtls_x509_crt_free( &cacert );
+    mbedtls_pk_free( &pkey );
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_destroy_key( key_slot );
+#endif
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) && \
+    defined(MBEDTLS_USE_PSA_CRYPTO)
+    if( opt.psk_opaque != 0 )
+    {
+        /* This is ok even if the slot hasn't been
+         * initialized (we might have jumed here
+         * immediately because of bad cmd line params,
+         * for example). */
+        status = psa_destroy_key( slot );
+        if( ( status != PSA_SUCCESS ) &&
+            ( opt.query_config_mode == DFL_QUERY_CONFIG_MODE ) )
+        {
+            mbedtls_printf( "Failed to destroy key slot %u - error was %d",
+                            (unsigned) slot, (int) status );
+            if( ret == 0 )
+                ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
+        }
+    }
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED &&
+          MBEDTLS_USE_PSA_CRYPTO */
+
+    mbedtls_ssl_session_free( &saved_session );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+    rng_free( &rng );
+    if( session_data != NULL )
+        mbedtls_platform_zeroize( session_data, session_data_len );
+    mbedtls_free( session_data );
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+    if( context_buf != NULL )
+        mbedtls_platform_zeroize( context_buf, context_buf_len );
+    mbedtls_free( context_buf );
+#endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    mbedtls_psa_crypto_free( );
+#endif
+
+#if defined(MBEDTLS_TEST_HOOKS)
+    if( test_hooks_failure_detected( ) )
+    {
+        if( ret == 0 )
+            ret = 1;
+        mbedtls_printf( "Test hooks detected errors.\n" );
+    }
+    test_hooks_free( );
+#endif /* MBEDTLS_TEST_HOOKS */
+
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+#if defined(MBEDTLS_MEMORY_DEBUG)
+    mbedtls_memory_buffer_alloc_status();
+#endif
+    mbedtls_memory_buffer_alloc_free();
+#endif  /* MBEDTLS_MEMORY_BUFFER_ALLOC_C */
+
+#if defined(_WIN32)
+    if( opt.query_config_mode == DFL_QUERY_CONFIG_MODE )
+    {
+        mbedtls_printf( "  + Press Enter to exit this program.\n" );
+        fflush( stdout ); getchar();
+    }
+#endif
+
+    // Shell can not handle large exit numbers -> 1 for errors
+    if( ret < 0 )
+        ret = 1;
+
+    if( opt.query_config_mode == DFL_QUERY_CONFIG_MODE )
+        mbedtls_exit( ret );
+    else
+        mbedtls_exit( query_config_ret );
+}
+#endif /* !MBEDTLS_SSL_TEST_IMPOSSIBLE && MBEDTLS_SSL_CLI_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_context_info.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_context_info.c
new file mode 100644
index 0000000..a204d9e
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_context_info.c
@@ -0,0 +1,1112 @@
+/*
+ *  MbedTLS SSL context deserializer from base64 code
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#if !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_ERROR_C) || \
+    !defined(MBEDTLS_SSL_TLS_C)
+int main( void )
+{
+    printf("MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_ERROR_C and/or "
+           "MBEDTLS_SSL_TLS_C not defined.\n");
+    return( 0 );
+}
+#else
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_DEPRECATE)
+#define _CRT_SECURE_NO_DEPRECATE 1
+#endif
+
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <time.h>
+#include "mbedtls/ssl.h"
+#include "mbedtls/error.h"
+#include "mbedtls/base64.h"
+#include "mbedtls/md.h"
+#include "mbedtls/md_internal.h"
+#include "mbedtls/x509_crt.h"
+#include "mbedtls/ssl_ciphersuites.h"
+
+/*
+ * This program version
+ */
+#define PROG_NAME "ssl_context_info"
+#define VER_MAJOR 0
+#define VER_MINOR 1
+
+/*
+ * Flags copied from the Mbed TLS library.
+ */
+#define SESSION_CONFIG_TIME_BIT          ( 1 << 0 )
+#define SESSION_CONFIG_CRT_BIT           ( 1 << 1 )
+#define SESSION_CONFIG_CLIENT_TICKET_BIT ( 1 << 2 )
+#define SESSION_CONFIG_MFL_BIT           ( 1 << 3 )
+#define SESSION_CONFIG_TRUNC_HMAC_BIT    ( 1 << 4 )
+#define SESSION_CONFIG_ETM_BIT           ( 1 << 5 )
+#define SESSION_CONFIG_TICKET_BIT        ( 1 << 6 )
+
+#define CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT    ( 1 << 0 )
+#define CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT     ( 1 << 1 )
+#define CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT      ( 1 << 2 )
+#define CONTEXT_CONFIG_ALPN_BIT                  ( 1 << 3 )
+
+#define TRANSFORM_RANDBYTE_LEN  64
+
+/*
+ * Minimum and maximum number of bytes for specific data: context, sessions,
+ * certificates, tickets and buffers in the program. The context and session
+ * size values have been calculated based on the 'print_deserialized_ssl_context()'
+ * and 'print_deserialized_ssl_session()' content.
+ */
+#define MIN_CONTEXT_LEN     84
+#define MIN_SESSION_LEN     88
+
+#define MAX_CONTEXT_LEN     875     /* without session data */
+#define MAX_SESSION_LEN     109     /* without certificate and ticket data */
+#define MAX_CERTIFICATE_LEN ( ( 1 << 24 ) - 1 )
+#define MAX_TICKET_LEN      ( ( 1 << 24 ) - 1 )
+
+#define MIN_SERIALIZED_DATA ( MIN_CONTEXT_LEN + MIN_SESSION_LEN )
+#define MAX_SERIALIZED_DATA ( MAX_CONTEXT_LEN + MAX_SESSION_LEN + \
+                              MAX_CERTIFICATE_LEN + MAX_TICKET_LEN )
+
+#define MIN_BASE64_LEN      ( MIN_SERIALIZED_DATA * 4 / 3 )
+#define MAX_BASE64_LEN      ( MAX_SERIALIZED_DATA * 4 / 3 + 3 )
+
+/*
+ * A macro that prevents from reading out of the ssl buffer range.
+ */
+#define CHECK_SSL_END( LEN )            \
+do                                      \
+{                                       \
+    if( end - ssl < (int)( LEN ) )      \
+    {                                   \
+        printf_err( "%s", buf_ln_err ); \
+        return;                         \
+    }                                   \
+} while( 0 )
+
+/*
+ * Global values
+ */
+FILE *b64_file = NULL;                  /* file with base64 codes to deserialize */
+char conf_keep_peer_certificate = 1;    /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE from mbedTLS configuration */
+char conf_dtls_proto = 1;               /* MBEDTLS_SSL_PROTO_DTLS from mbedTLS configuration */
+char debug = 0;                         /* flag for debug messages */
+const char alloc_err[] = "Cannot allocate memory\n";
+const char buf_ln_err[] = "Buffer does not have enough data to complete the parsing\n";
+
+/*
+ * Basic printing functions
+ */
+void print_version( )
+{
+    printf( "%s v%d.%d\n", PROG_NAME, VER_MAJOR, VER_MINOR );
+}
+
+void print_usage( )
+{
+    print_version();
+    printf( "\nThis program is used to deserialize an Mbed TLS SSL session from the base64 code provided\n"
+            "in the text file. The program can deserialize many codes from one file, but they must be\n"
+            "separated, e.g. by a newline.\n\n" );
+    printf(
+        "Usage:\n"
+        "\t-f path            - Path to the file with base64 code\n"
+        "\t-v                 - Show version\n"
+        "\t-h                 - Show this usage\n"
+        "\t-d                 - Print more information\n"
+        "\t--keep-peer-cert=0 - Use this option if you know that the Mbed TLS library\n"
+        "\t                     has been compiled with the MBEDTLS_SSL_KEEP_PEER_CERTIFICATE\n"
+        "\t                     flag. You can also use it if there are some problems with reading\n"
+        "\t                     the information about certificate\n"
+        "\t--dtls-protocol=0  - Use this option if you know that the Mbed TLS library\n"
+        "\t                     has been compiled without the MBEDTLS_SSL_PROTO_DTLS flag\n"
+        "\n"
+    );
+}
+
+void printf_dbg( const char *str, ... )
+{
+    if( debug )
+    {
+        va_list args;
+        va_start( args, str );
+        printf( "debug: " );
+        vprintf( str, args );
+        fflush( stdout );
+        va_end( args );
+    }
+}
+
+void printf_err( const char *str, ... )
+{
+    va_list args;
+    va_start( args, str );
+    fflush( stdout );
+    fprintf( stderr, "ERROR: " );
+    vfprintf( stderr, str, args );
+    fflush( stderr );
+    va_end( args );
+}
+
+/*
+ * Exit from the program in case of error
+ */
+void error_exit()
+{
+    if( NULL != b64_file )
+    {
+        fclose( b64_file );
+    }
+    exit( -1 );
+}
+
+/*
+ * This function takes the input arguments of this program
+ */
+void parse_arguments( int argc, char *argv[] )
+{
+    int i = 1;
+
+    if( argc < 2 )
+    {
+        print_usage();
+        error_exit();
+    }
+
+    while( i < argc )
+    {
+        if( strcmp( argv[i], "-d" ) == 0 )
+        {
+            debug = 1;
+        }
+        else if( strcmp( argv[i], "-h" ) == 0 )
+        {
+            print_usage();
+        }
+        else if( strcmp( argv[i], "-v" ) == 0 )
+        {
+            print_version();
+        }
+        else if( strcmp( argv[i], "-f" ) == 0 )
+        {
+            if( ++i >= argc )
+            {
+                printf_err( "File path is empty\n" );
+                error_exit();
+            }
+
+            if( ( b64_file = fopen( argv[i], "r" ) ) == NULL )
+            {
+                printf_err( "Cannot find file \"%s\"\n", argv[i] );
+                error_exit();
+            }
+        }
+        else if( strcmp( argv[i], "--keep-peer-cert=0" ) == 0 )
+        {
+            conf_keep_peer_certificate = 0;
+        }
+        else if( strcmp( argv[i], "--dtls-protocol=0" ) == 0 )
+        {
+            conf_dtls_proto = 0;
+        }
+        else
+        {
+            print_usage();
+            error_exit();
+        }
+
+        i++;
+    }
+}
+
+/*
+ * This function prints base64 code to the stdout
+ */
+void print_b64( const uint8_t *b, size_t len )
+{
+    size_t i = 0;
+    const uint8_t *end = b + len;
+    printf("\t");
+    while( b < end )
+    {
+        if( ++i > 75 )
+        {
+            printf( "\n\t" );
+            i = 0;
+        }
+        printf( "%c", *b++ );
+    }
+    printf( "\n" );
+    fflush( stdout );
+}
+
+/*
+ * This function prints hex code from the buffer to the stdout.
+ *
+ * /p b         buffer with data to print
+ * /p len       number of bytes to print
+ * /p in_line   number of bytes in one line
+ * /p prefix    prefix for the new lines
+ */
+void print_hex( const uint8_t *b, size_t len,
+                const size_t in_line, const char *prefix )
+{
+    size_t i = 0;
+    const uint8_t *end = b + len;
+
+    if( prefix == NULL )
+    {
+        prefix = "";
+    }
+
+    while( b < end )
+    {
+        if( ++i > in_line )
+        {
+            printf( "\n%s", prefix );
+            i = 1;
+        }
+        printf( "%02X ", (uint8_t) *b++ );
+    }
+    printf("\n");
+    fflush(stdout);
+}
+
+/*
+ *  Print the value of time_t in format e.g. 2020-01-23 13:05:59
+ */
+void print_time( const time_t *time )
+{
+    char buf[20];
+    struct tm *t = gmtime( time );
+    static const char format[] = "%Y-%m-%d %H:%M:%S";
+    if( NULL != t )
+    {
+        strftime( buf, sizeof( buf ), format, t );
+        printf( "%s\n", buf );
+    }
+    else
+    {
+        printf( "unknown\n" );
+    }
+}
+
+/*
+ * Print the input string if the bit is set in the value
+ */
+void print_if_bit( const char *str, int bit, int val )
+{
+    if( bit & val )
+    {
+        printf( "\t%s\n", str );
+    }
+}
+
+/*
+ * Return pointer to hardcoded "enabled" or "disabled" depending on the input value
+ */
+const char * get_enabled_str( int is_en )
+{
+    return ( is_en ) ? "enabled" : "disabled";
+}
+
+/*
+ * Return pointer to hardcoded MFL string value depending on the MFL code at the input
+ */
+const char * get_mfl_str( int mfl_code )
+{
+    switch( mfl_code )
+    {
+        case MBEDTLS_SSL_MAX_FRAG_LEN_NONE:
+            return "none";
+        case MBEDTLS_SSL_MAX_FRAG_LEN_512:
+            return "512";
+        case MBEDTLS_SSL_MAX_FRAG_LEN_1024:
+            return "1024";
+        case MBEDTLS_SSL_MAX_FRAG_LEN_2048:
+            return "2048";
+        case MBEDTLS_SSL_MAX_FRAG_LEN_4096:
+            return "4096";
+        default:
+            return "error";
+    }
+}
+
+/*
+ * Read next base64 code from the 'b64_file'. The 'b64_file' must be opened
+ * previously. After each call to this function, the internal file position
+ * indicator of the global b64_file is advanced.
+ *
+ * Note - This function checks the size of the input buffer and if necessary,
+ *        increases it to the maximum MAX_BASE64_LEN
+ *
+ * /p b64       pointer to the pointer of the buffer for input data
+ * /p max_len   pointer to the current buffer capacity. It can be changed if
+ *              the buffer needs to be increased
+ *
+ * \retval      number of bytes written in to the b64 buffer or 0 in case no more
+ *              data was found
+ */
+size_t read_next_b64_code( uint8_t **b64, size_t *max_len )
+{
+    int valid_balance = 0;  /* balance between valid and invalid characters */
+    size_t len = 0;
+    char pad = 0;
+    int c = 0;
+
+    while( EOF != c )
+    {
+        char c_valid = 0;
+
+        c = fgetc( b64_file );
+
+        if( pad > 0 )
+        {
+            if( c == '=' && pad == 1 )
+            {
+                c_valid = 1;
+                pad = 2;
+            }
+        }
+        else if( ( c >= 'A' && c <= 'Z' ) ||
+                 ( c >= 'a' && c <= 'z' ) ||
+                 ( c >= '0' && c <= '9' ) ||
+                   c == '+' || c == '/' )
+        {
+            c_valid = 1;
+        }
+        else if( c == '=' )
+        {
+            c_valid = 1;
+            pad = 1;
+        }
+        else if( c == '-' )
+        {
+            c = '+';
+            c_valid = 1;
+        }
+        else if( c == '_' )
+        {
+            c = '/';
+            c_valid = 1;
+        }
+
+        if( c_valid )
+        {
+            /* A string of characters that could be a base64 code. */
+            valid_balance++;
+
+            if( len < *max_len )
+            {
+                ( *b64 )[ len++ ] = c;
+            }
+            else if( *max_len < MAX_BASE64_LEN )
+            {
+                /* Current buffer is too small, but can be resized. */
+                void *ptr;
+                size_t new_size = ( MAX_BASE64_LEN - 4096 > *max_len ) ?
+                                  *max_len + 4096 : MAX_BASE64_LEN;
+
+                ptr = realloc( *b64, new_size );
+                if( NULL == ptr )
+                {
+                    printf_err( alloc_err );
+                    return 0;
+                }
+                *b64 = ptr;
+                *max_len = new_size;
+                ( *b64 )[ len++ ] = c;
+            }
+            else
+            {
+                /* Too much data so it will be treated as invalid */
+                len++;
+            }
+        }
+        else if( len > 0 )
+        {
+            /* End of a string that could be a base64 code, but need to check
+             * that the length of the characters is correct. */
+
+            valid_balance--;
+
+            if( len < MIN_CONTEXT_LEN )
+            {
+                printf_dbg( "The code found is too small to be a SSL context.\n" );
+                len = pad = 0;
+            }
+            else if( len > *max_len )
+            {
+                printf_err( "The code found is too large by %u bytes.\n", len - *max_len );
+                len = pad = 0;
+            }
+            else if( len % 4 != 0 )
+            {
+                printf_err( "The length of the base64 code found should be a multiple of 4.\n" );
+                len = pad = 0;
+            }
+            else
+            {
+                /* Base64 code with valid character length. */
+                return len;
+            }
+        }
+        else
+        {
+            valid_balance--;
+        }
+
+        /* Detection of potentially wrong file format like: binary, zip, ISO, etc. */
+        if( valid_balance < -100 )
+        {
+            printf_err( "Too many bad symbols detected. File check aborted.\n" );
+            return 0;
+        }
+    }
+
+    printf_dbg( "End of file\n" );
+    return 0;
+}
+
+/*
+ * This function deserializes and prints to the stdout all obtained information
+ * about the certificates from provided data.
+ *
+ * /p ssl   pointer to serialized certificate
+ * /p len   number of bytes in the buffer
+*/
+void print_deserialized_ssl_cert( const uint8_t *ssl, uint32_t len )
+{
+    enum { STRLEN = 4096 };
+    mbedtls_x509_crt crt;
+    int ret;
+    char str[STRLEN];
+
+    printf( "\nCertificate:\n" );
+
+    mbedtls_x509_crt_init( &crt );
+    ret = mbedtls_x509_crt_parse_der( &crt, ssl, len );
+    if( 0 != ret )
+    {
+        mbedtls_strerror( ret, str, STRLEN );
+        printf_err( "Invalid format of X.509 - %s\n", str );
+        printf( "Cannot deserialize:\n\t" );
+        print_hex( ssl, len, 25, "\t" );
+    }
+    else
+    {
+        mbedtls_x509_crt *current = &crt;
+
+        while( current != NULL )
+        {
+            ret = mbedtls_x509_crt_info( str, STRLEN, "\t", current );
+            if( 0 > ret )
+            {
+                mbedtls_strerror( ret, str, STRLEN );
+                printf_err( "Cannot write to the output - %s\n", str );
+            }
+            else
+            {
+                printf( "%s", str );
+            }
+
+            current = current->next;
+
+            if( current )
+            {
+                printf( "\n" );
+            }
+
+        }
+    }
+
+   mbedtls_x509_crt_free( &crt );
+}
+
+/*
+ * This function deserializes and prints to the stdout all obtained information
+ * about the session from provided data. This function was built based on
+ * mbedtls_ssl_session_load(). mbedtls_ssl_session_load() could not be used
+ * due to dependencies on the mbedTLS configuration.
+ *
+ * The data structure in the buffer:
+ *  uint64 start_time;
+ *  uint8 ciphersuite[2];        // defined by the standard
+ *  uint8 compression;           // 0 or 1
+ *  uint8 session_id_len;        // at most 32
+ *  opaque session_id[32];
+ *  opaque master[48];           // fixed length in the standard
+ *  uint32 verify_result;
+ *  opaque peer_cert<0..2^24-1>; // length 0 means no peer cert
+ *  opaque ticket<0..2^24-1>;    // length 0 means no ticket
+ *  uint32 ticket_lifetime;
+ *  uint8 mfl_code;              // up to 255 according to standard
+ *  uint8 trunc_hmac;            // 0 or 1
+ *  uint8 encrypt_then_mac;      // 0 or 1
+ *
+ * /p ssl               pointer to serialized session
+ * /p len               number of bytes in the buffer
+ * /p session_cfg_flag  session configuration flags
+ */
+void print_deserialized_ssl_session( const uint8_t *ssl, uint32_t len,
+                                     int session_cfg_flag )
+{
+    const struct mbedtls_ssl_ciphersuite_t * ciphersuite_info;
+    int ciphersuite_id;
+    uint32_t cert_len, ticket_len;
+    uint32_t verify_result, ticket_lifetime;
+    const uint8_t *end = ssl + len;
+
+    printf( "\nSession info:\n" );
+
+    if( session_cfg_flag & SESSION_CONFIG_TIME_BIT )
+    {
+        uint64_t start;
+        CHECK_SSL_END( 8 );
+        start = ( (uint64_t) ssl[0] << 56 ) |
+                ( (uint64_t) ssl[1] << 48 ) |
+                ( (uint64_t) ssl[2] << 40 ) |
+                ( (uint64_t) ssl[3] << 32 ) |
+                ( (uint64_t) ssl[4] << 24 ) |
+                ( (uint64_t) ssl[5] << 16 ) |
+                ( (uint64_t) ssl[6] <<  8 ) |
+                ( (uint64_t) ssl[7] );
+        ssl += 8;
+        printf( "\tstart time     : " );
+        print_time( (time_t*) &start );
+    }
+
+    CHECK_SSL_END( 2 );
+    ciphersuite_id = ( (int) ssl[0] << 8 ) | (int) ssl[1];
+    printf_dbg( "Ciphersuite ID: %d\n", ciphersuite_id );
+    ssl += 2;
+
+    ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuite_id );
+    if( ciphersuite_info == NULL )
+    {
+        printf_err( "Cannot find ciphersuite info\n" );
+    }
+    else
+    {
+        const mbedtls_cipher_info_t *cipher_info;
+        const mbedtls_md_info_t *md_info;
+
+        printf( "\tciphersuite    : %s\n", ciphersuite_info->name );
+        printf( "\tcipher flags   : 0x%02X\n", ciphersuite_info->flags );
+
+        cipher_info = mbedtls_cipher_info_from_type( ciphersuite_info->cipher );
+        if( cipher_info == NULL )
+        {
+            printf_err( "Cannot find cipher info\n" );
+        }
+        else
+        {
+            printf( "\tcipher         : %s\n", cipher_info->name );
+        }
+
+        md_info = mbedtls_md_info_from_type( ciphersuite_info->mac );
+        if( md_info == NULL )
+        {
+            printf_err( "Cannot find Message-Digest info\n" );
+        }
+        else
+        {
+            printf( "\tMessage-Digest : %s\n", md_info->name );
+        }
+    }
+
+    CHECK_SSL_END( 1 );
+    printf( "\tcompression    : %s\n", get_enabled_str( *ssl++ ) );
+
+    /* Note - Here we can get session ID length from serialized data, but we
+     * use hardcoded 32-bytes length. This approach was taken from
+     * 'mbedtls_ssl_session_load()'. */
+    CHECK_SSL_END( 1 + 32 );
+    printf_dbg( "Session id length: %u\n", (uint32_t) *ssl++ );
+    printf( "\tsession ID     : ");
+    print_hex( ssl, 32, 16, "\t                 " );
+    ssl += 32;
+
+    printf( "\tmaster secret  : ");
+    CHECK_SSL_END( 48 );
+    print_hex( ssl, 48, 16, "\t                 " );
+    ssl += 48;
+
+    CHECK_SSL_END( 4 );
+    verify_result = ( (uint32_t) ssl[0] << 24 ) |
+                    ( (uint32_t) ssl[1] << 16 ) |
+                    ( (uint32_t) ssl[2] <<  8 ) |
+                    ( (uint32_t) ssl[3] );
+    ssl += 4;
+    printf( "\tverify result  : 0x%08X\n", verify_result );
+
+    if( SESSION_CONFIG_CRT_BIT & session_cfg_flag )
+    {
+        if( conf_keep_peer_certificate )
+        {
+            CHECK_SSL_END( 3 );
+            cert_len = ( (uint32_t) ssl[0] << 16 ) |
+                       ( (uint32_t) ssl[1] <<  8 ) |
+                       ( (uint32_t) ssl[2] );
+            ssl += 3;
+            printf_dbg( "Certificate length: %u\n", cert_len );
+
+            if( cert_len > 0 )
+            {
+                CHECK_SSL_END( cert_len );
+                print_deserialized_ssl_cert( ssl, cert_len );
+                ssl += cert_len;
+            }
+        }
+        else
+        {
+            printf( "\tPeer digest    : " );
+
+            CHECK_SSL_END( 1 );
+            switch( (mbedtls_md_type_t) *ssl++ )
+            {
+                case MBEDTLS_MD_NONE:
+                    printf( "none\n" );
+                    break;
+                case MBEDTLS_MD_MD2:
+                    printf( "MD2\n" );
+                    break;
+                case MBEDTLS_MD_MD4:
+                    printf( "MD4\n" );
+                    break;
+                case MBEDTLS_MD_MD5:
+                    printf( "MD5\n" );
+                    break;
+                case MBEDTLS_MD_SHA1:
+                    printf( "SHA1\n" );
+                    break;
+                case MBEDTLS_MD_SHA224:
+                    printf( "SHA224\n" );
+                    break;
+                case MBEDTLS_MD_SHA256:
+                    printf( "SHA256\n" );
+                    break;
+                case MBEDTLS_MD_SHA384:
+                    printf( "SHA384\n" );
+                    break;
+                case MBEDTLS_MD_SHA512:
+                    printf( "SHA512\n" );
+                    break;
+                case MBEDTLS_MD_RIPEMD160:
+                    printf( "RIPEMD160\n" );
+                    break;
+                default:
+                    printf( "undefined or erroneous\n" );
+                    break;
+            }
+
+            CHECK_SSL_END( 1 );
+            cert_len  = (uint32_t) *ssl++;
+            printf_dbg( "Message-Digest length: %u\n", cert_len );
+
+            if( cert_len > 0 )
+            {
+                printf( "\tPeer digest cert : " );
+                CHECK_SSL_END( cert_len );
+                print_hex( ssl, cert_len, 16, "\t                   " );
+                ssl += cert_len;
+            }
+        }
+    }
+
+    if( SESSION_CONFIG_CLIENT_TICKET_BIT & session_cfg_flag )
+    {
+        printf( "\nTicket:\n" );
+
+        CHECK_SSL_END( 3 );
+        ticket_len = ( (uint32_t) ssl[0] << 16 ) |
+                     ( (uint32_t) ssl[1] <<  8 ) |
+                     ( (uint32_t) ssl[2] );
+        ssl += 3;
+        printf_dbg( "Ticket length: %u\n", ticket_len );
+
+        if( ticket_len > 0 )
+        {
+            printf( "\t" );
+            CHECK_SSL_END( ticket_len );
+            print_hex( ssl, ticket_len, 22, "\t" );
+            ssl += ticket_len;
+            printf( "\n" );
+        }
+
+        CHECK_SSL_END( 4 );
+        ticket_lifetime = ( (uint32_t) ssl[0] << 24 ) |
+                          ( (uint32_t) ssl[1] << 16 ) |
+                          ( (uint32_t) ssl[2] <<  8 ) |
+                          ( (uint32_t) ssl[3] );
+        ssl += 4;
+        printf( "\tlifetime : %u sec.\n", ticket_lifetime );
+    }
+
+    if( ssl < end )
+    {
+        printf( "\nSession others:\n" );
+    }
+
+    if( SESSION_CONFIG_MFL_BIT & session_cfg_flag )
+    {
+        CHECK_SSL_END( 1 );
+        printf( "\tMFL                      : %s\n", get_mfl_str( *ssl++ ) );
+    }
+
+    if( SESSION_CONFIG_TRUNC_HMAC_BIT & session_cfg_flag )
+    {
+        CHECK_SSL_END( 1 );
+        printf( "\tnegotiate truncated HMAC : %s\n", get_enabled_str( *ssl++ ) );
+    }
+
+    if( SESSION_CONFIG_ETM_BIT & session_cfg_flag )
+    {
+        CHECK_SSL_END( 1 );
+        printf( "\tEncrypt-then-MAC         : %s\n", get_enabled_str( *ssl++ ) );
+    }
+
+    if( 0 != ( end - ssl ) )
+    {
+        printf_err( "%i bytes left to analyze from session\n", (int32_t)( end - ssl ) );
+    }
+}
+
+/*
+ * This function deserializes and prints to the stdout all obtained information
+ * about the context from provided data. This function was built based on
+ * mbedtls_ssl_context_load(). mbedtls_ssl_context_load() could not be used
+ * due to dependencies on the mbedTLS configuration and the configuration of
+ * the context when serialization was created.
+ *
+ * The data structure in the buffer:
+ *  // header
+ *  uint8 version[3];
+ *  uint8 configuration[5];
+ *  // session sub-structure
+ *  uint32_t session_len;
+ *  opaque session<1..2^32-1>;  // see mbedtls_ssl_session_save()
+ *  // transform sub-structure
+ *  uint8 random[64];           // ServerHello.random+ClientHello.random
+ *  uint8 in_cid_len;
+ *  uint8 in_cid<0..2^8-1>      // Connection ID: expected incoming value
+ *  uint8 out_cid_len;
+ *  uint8 out_cid<0..2^8-1>     // Connection ID: outgoing value to use
+ *  // fields from ssl_context
+ *  uint32 badmac_seen;         // DTLS: number of records with failing MAC
+ *  uint64 in_window_top;       // DTLS: last validated record seq_num
+ *  uint64 in_window;           // DTLS: bitmask for replay protection
+ *  uint8 disable_datagram_packing; // DTLS: only one record per datagram
+ *  uint64 cur_out_ctr;         // Record layer: outgoing sequence number
+ *  uint16 mtu;                 // DTLS: path mtu (max outgoing fragment size)
+ *  uint8 alpn_chosen_len;
+ *  uint8 alpn_chosen<0..2^8-1> // ALPN: negotiated application protocol
+ *
+ * /p ssl   pointer to serialized session
+ * /p len   number of bytes in the buffer
+ */
+void print_deserialized_ssl_context( const uint8_t *ssl, size_t len )
+{
+    const uint8_t *end = ssl + len;
+    uint32_t session_len;
+    int session_cfg_flag;
+    int context_cfg_flag;
+
+    printf( "\nMbed TLS version:\n" );
+
+    CHECK_SSL_END( 3 + 2 + 3 );
+
+    printf( "\tmajor    %u\n", (uint32_t) *ssl++ );
+    printf( "\tminor    %u\n", (uint32_t) *ssl++ );
+    printf( "\tpath     %u\n", (uint32_t) *ssl++ );
+
+    printf( "\nEnabled session and context configuration:\n" );
+
+    session_cfg_flag = ( (int) ssl[0] << 8 ) | ( (int) ssl[1] );
+    ssl += 2;
+
+    context_cfg_flag = ( (int) ssl[0] << 16 ) |
+                       ( (int) ssl[1] <<  8 ) |
+                       ( (int) ssl[2] ) ;
+    ssl += 3;
+
+    printf_dbg( "Session config flags 0x%04X\n", session_cfg_flag );
+    printf_dbg( "Context config flags 0x%06X\n", context_cfg_flag );
+
+    print_if_bit( "MBEDTLS_HAVE_TIME", SESSION_CONFIG_TIME_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_X509_CRT_PARSE_C", SESSION_CONFIG_CRT_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_MAX_FRAGMENT_LENGTH", SESSION_CONFIG_MFL_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_TRUNCATED_HMAC", SESSION_CONFIG_TRUNC_HMAC_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_ENCRYPT_THEN_MAC", SESSION_CONFIG_ETM_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_SESSION_TICKETS", SESSION_CONFIG_TICKET_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_SESSION_TICKETS and client", SESSION_CONFIG_CLIENT_TICKET_BIT, session_cfg_flag );
+
+    print_if_bit( "MBEDTLS_SSL_DTLS_CONNECTION_ID", CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT, context_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_DTLS_BADMAC_LIMIT", CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT, context_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_DTLS_ANTI_REPLAY", CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT, context_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_ALPN", CONTEXT_CONFIG_ALPN_BIT, context_cfg_flag );
+
+    CHECK_SSL_END( 4 );
+    session_len = ( (uint32_t) ssl[0] << 24 ) |
+                  ( (uint32_t) ssl[1] << 16 ) |
+                  ( (uint32_t) ssl[2] <<  8 ) |
+                  ( (uint32_t) ssl[3] );
+    ssl += 4;
+    printf_dbg( "Session length %u\n", session_len );
+
+    CHECK_SSL_END( session_len );
+    print_deserialized_ssl_session( ssl, session_len, session_cfg_flag );
+    ssl += session_len;
+
+    printf( "\nRandom bytes:\n\t");
+
+    CHECK_SSL_END( TRANSFORM_RANDBYTE_LEN );
+    print_hex( ssl, TRANSFORM_RANDBYTE_LEN, 22, "\t" );
+    ssl += TRANSFORM_RANDBYTE_LEN;
+
+    printf( "\nContext others:\n" );
+
+    if( CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT & context_cfg_flag )
+    {
+        uint8_t cid_len;
+
+        CHECK_SSL_END( 1 );
+        cid_len = *ssl++;
+        printf_dbg( "In CID length %u\n", (uint32_t) cid_len );
+
+        printf( "\tin CID                             : " );
+        if( cid_len > 0 )
+        {
+            CHECK_SSL_END( cid_len );
+            print_hex( ssl, cid_len, 20, "\t" );
+            ssl += cid_len;
+        }
+        else
+        {
+            printf( "none\n" );
+        }
+
+        CHECK_SSL_END( 1 );
+        cid_len = *ssl++;
+        printf_dbg( "Out CID length %u\n", (uint32_t) cid_len );
+
+        printf( "\tout CID                            : " );
+        if( cid_len > 0 )
+        {
+            CHECK_SSL_END( cid_len );
+            print_hex( ssl, cid_len, 20, "\t" );
+            ssl += cid_len;
+        }
+        else
+        {
+            printf( "none\n" );
+        }
+    }
+
+    if( CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT & context_cfg_flag )
+    {
+        uint32_t badmac_seen;
+
+        CHECK_SSL_END( 4 );
+        badmac_seen = ( (uint32_t) ssl[0] << 24 ) |
+                      ( (uint32_t) ssl[1] << 16 ) |
+                      ( (uint32_t) ssl[2] <<  8 ) |
+                      ( (uint32_t) ssl[3] );
+        ssl += 4;
+        printf( "\tbad MAC seen number                : %u\n", badmac_seen );
+
+        /* value 'in_window_top' from mbedtls_ssl_context */
+        printf( "\tlast validated record sequence no. : " );
+        CHECK_SSL_END( 8 );
+        print_hex( ssl, 8, 20, "" );
+        ssl += 8;
+
+        /* value 'in_window' from mbedtls_ssl_context */
+        printf( "\tbitmask for replay detection       : " );
+        CHECK_SSL_END( 8 );
+        print_hex( ssl, 8, 20, "" );
+        ssl += 8;
+    }
+
+    if( conf_dtls_proto )
+    {
+        CHECK_SSL_END( 1 );
+        printf( "\tDTLS datagram packing              : %s\n",
+                get_enabled_str( ! ( *ssl++ ) ) );
+    }
+
+    /* value 'cur_out_ctr' from mbedtls_ssl_context */
+    printf( "\toutgoing record sequence no.       : ");
+    CHECK_SSL_END( 8 );
+    print_hex( ssl, 8, 20, "" );
+    ssl += 8;
+
+    if( conf_dtls_proto )
+    {
+        uint16_t mtu;
+        CHECK_SSL_END( 2 );
+        mtu = ( ssl[0] << 8 ) | ssl[1];
+        ssl += 2;
+        printf( "\tMTU                                : %u\n", mtu );
+    }
+
+
+    if( CONTEXT_CONFIG_ALPN_BIT & context_cfg_flag )
+    {
+        uint8_t alpn_len;
+
+        CHECK_SSL_END( 1 );
+        alpn_len = *ssl++;
+        printf_dbg( "ALPN length %u\n", (uint32_t) alpn_len );
+
+        printf( "\tALPN negotiation                   : " );
+        CHECK_SSL_END( alpn_len );
+        if( alpn_len > 0 )
+        {
+            if( strlen( (const char*) ssl ) == alpn_len )
+            {
+                printf( "%s\n", ssl );
+            }
+            else
+            {
+                printf( "\n" );
+                printf_err( "\tALPN negotiation is incorrect\n" );
+            }
+            ssl += alpn_len;
+        }
+        else
+        {
+            printf( "not selected\n" );
+        }
+    }
+
+    if( 0 != ( end - ssl ) )
+    {
+        printf_err( "%i bytes left to analyze from context\n", (int32_t)( end - ssl ) );
+    }
+    printf( "\n" );
+}
+
+int main( int argc, char *argv[] )
+{
+    enum { SSL_INIT_LEN = 4096 };
+
+    uint32_t b64_counter = 0;
+    uint8_t *b64_buf = NULL;
+    uint8_t *ssl_buf = NULL;
+    size_t b64_max_len = SSL_INIT_LEN;
+    size_t ssl_max_len = SSL_INIT_LEN;
+    size_t ssl_len = 0;
+
+     /* The 'b64_file' is opened when parsing arguments to check that the
+      * file name is correct */
+    parse_arguments( argc, argv );
+
+    if( NULL != b64_file )
+    {
+        b64_buf = malloc( SSL_INIT_LEN );
+        ssl_buf = malloc( SSL_INIT_LEN );
+
+        if( NULL == b64_buf || NULL == ssl_buf )
+        {
+            printf_err( alloc_err );
+            fclose( b64_file );
+            b64_file = NULL;
+        }
+    }
+
+    while( NULL != b64_file )
+    {
+        size_t b64_len = read_next_b64_code( &b64_buf, &b64_max_len );
+        if( b64_len > 0)
+        {
+            int ret;
+            size_t ssl_required_len = b64_len * 3 / 4 + 1;
+
+            /* Allocate more memory if necessary. */
+            if( ssl_required_len > ssl_max_len )
+            {
+                void *ptr = realloc( ssl_buf, ssl_required_len );
+                if( NULL == ptr )
+                {
+                    printf_err( alloc_err );
+                    fclose( b64_file );
+                    b64_file = NULL;
+                    break;
+                }
+                ssl_buf = ptr;
+                ssl_max_len = ssl_required_len;
+            }
+
+            printf( "\nDeserializing number %u:\n",  ++b64_counter );
+
+            printf( "\nBase64 code:\n" );
+            print_b64( b64_buf, b64_len );
+
+            ret = mbedtls_base64_decode( ssl_buf, ssl_max_len, &ssl_len, b64_buf, b64_len );
+            if( ret != 0)
+            {
+                mbedtls_strerror( ret, (char*) b64_buf, b64_max_len );
+                printf_err( "base64 code cannot be decoded - %s\n", b64_buf );
+                continue;
+            }
+
+            if( debug )
+            {
+                printf( "\nDecoded data in hex:\n\t");
+                print_hex( ssl_buf, ssl_len, 25, "\t" );
+            }
+
+            print_deserialized_ssl_context( ssl_buf, ssl_len );
+
+        }
+        else
+        {
+            fclose( b64_file );
+            b64_file = NULL;
+        }
+    }
+
+    free( b64_buf );
+    free( ssl_buf );
+
+    if( b64_counter > 0 )
+    {
+        printf_dbg( "Finished. Found %u base64 codes\n", b64_counter );
+    }
+    else
+    {
+        printf( "Finished. No valid base64 code found\n" );
+    }
+
+    return 0;
+}
+
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_fork_server.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_fork_server.c
new file mode 100644
index 0000000..3a07179
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_fork_server.c
@@ -0,0 +1,423 @@
+/*
+ *  SSL server demonstration program using fork() for handling multiple clients
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define mbedtls_time_t          time_t
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) ||    \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
+    !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) ||     \
+    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) ||    \
+    !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_TIMING_C) || \
+    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_PEM_PARSE_C)
+int main( int argc, char *argv[] )
+{
+    ((void) argc);
+    ((void) argv);
+
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
+           "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
+           "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
+           "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
+           "MBEDTLS_TIMING_C and/or MBEDTLS_PEM_PARSE_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#elif defined(_WIN32)
+int main( void )
+{
+    mbedtls_printf("_WIN32 defined. This application requires fork() and signals "
+           "to work correctly.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/certs.h"
+#include "mbedtls/x509.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/timing.h"
+
+#include <string.h>
+#include <signal.h>
+
+#if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
+#include <unistd.h>
+#endif
+
+#define HTTP_RESPONSE \
+    "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
+    "<h2>mbed TLS Test Server</h2>\r\n" \
+    "<p>Successful connection using: %s</p>\r\n"
+
+#define DEBUG_LEVEL 0
+
+
+static void my_debug( void *ctx, int level,
+                      const char *file, int line,
+                      const char *str )
+{
+    ((void) level);
+
+    mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
+    fflush(  (FILE *) ctx  );
+}
+
+int main( void )
+{
+    int ret = 1, len, cnt = 0, pid;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_net_context listen_fd, client_fd;
+    unsigned char buf[1024];
+    const char *pers = "ssl_fork_server";
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_x509_crt srvcert;
+    mbedtls_pk_context pkey;
+
+    mbedtls_net_init( &listen_fd );
+    mbedtls_net_init( &client_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    mbedtls_entropy_init( &entropy );
+    mbedtls_pk_init( &pkey );
+    mbedtls_x509_crt_init( &srvcert );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    signal( SIGCHLD, SIG_IGN );
+
+    /*
+     * 0. Initial seeding of the RNG
+     */
+    mbedtls_printf( "\n  . Initial seeding of the random generator..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
+                               (const unsigned char *) pers,
+                               strlen( pers ) ) ) != 0 )
+    {
+        mbedtls_printf( " failed!  mbedtls_ctr_drbg_seed returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 1. Load the certificates and private RSA key
+     */
+    mbedtls_printf( "  . Loading the server cert. and key..." );
+    fflush( stdout );
+
+    /*
+     * This demonstration program uses embedded test certificates.
+     * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
+     * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
+     */
+    ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
+                          mbedtls_test_srv_crt_len );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed!  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
+                          mbedtls_test_cas_pem_len );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed!  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+    ret =  mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
+                          mbedtls_test_srv_key_len, NULL, 0 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed!  mbedtls_pk_parse_key returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 1b. Prepare SSL configuration
+     */
+    mbedtls_printf( "  . Configuring SSL..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                    MBEDTLS_SSL_IS_SERVER,
+                    MBEDTLS_SSL_TRANSPORT_STREAM,
+                    MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed!  mbedtls_ssl_config_defaults returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+    mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+
+    mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
+    if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
+    {
+        mbedtls_printf( " failed!  mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 2. Setup the listening TCP socket
+     */
+    mbedtls_printf( "  . Bind on https://localhost:4433/ ..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
+    {
+        mbedtls_printf( " failed!  mbedtls_net_bind returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    while( 1 )
+    {
+        /*
+         * 3. Wait until a client connects
+         */
+        mbedtls_net_init( &client_fd );
+        mbedtls_ssl_init( &ssl );
+
+        mbedtls_printf( "  . Waiting for a remote connection ...\n" );
+        fflush( stdout );
+
+        if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
+                                        NULL, 0, NULL ) ) != 0 )
+        {
+            mbedtls_printf( " failed!  mbedtls_net_accept returned %d\n\n", ret );
+            goto exit;
+        }
+
+        /*
+         * 3.5. Forking server thread
+         */
+
+        mbedtls_printf( "  . Forking to handle connection ..." );
+        fflush( stdout );
+
+        pid = fork();
+
+        if( pid < 0 )
+        {
+            mbedtls_printf(" failed!  fork returned %d\n\n", pid );
+            goto exit;
+        }
+
+        if( pid != 0 )
+        {
+            mbedtls_printf( " ok\n" );
+            mbedtls_net_close( &client_fd );
+
+            if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
+                                         (const unsigned char *) "parent",
+                                         6 ) ) != 0 )
+            {
+                mbedtls_printf( " failed!  mbedtls_ctr_drbg_reseed returned %d\n\n", ret );
+                goto exit;
+            }
+
+            continue;
+        }
+
+        mbedtls_net_close( &listen_fd );
+
+        pid = getpid();
+
+        /*
+         * 4. Setup stuff
+         */
+        mbedtls_printf( "pid %d: Setting up the SSL data.\n", pid );
+        fflush( stdout );
+
+        if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
+                                     (const unsigned char *) "child",
+                                     5 ) ) != 0 )
+        {
+            mbedtls_printf(
+                    "pid %d: SSL setup failed!  mbedtls_ctr_drbg_reseed returned %d\n\n",
+                    pid, ret );
+            goto exit;
+        }
+
+        if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+        {
+            mbedtls_printf(
+                    "pid %d: SSL setup failed!  mbedtls_ssl_setup returned %d\n\n",
+                    pid, ret );
+            goto exit;
+        }
+
+        mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
+
+        mbedtls_printf( "pid %d: SSL setup ok\n", pid );
+
+        /*
+         * 5. Handshake
+         */
+        mbedtls_printf( "pid %d: Performing the SSL/TLS handshake.\n", pid );
+        fflush( stdout );
+
+        while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
+        {
+            if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+            {
+                mbedtls_printf(
+                        "pid %d: SSL handshake failed!  mbedtls_ssl_handshake returned %d\n\n",
+                        pid, ret );
+                goto exit;
+            }
+        }
+
+        mbedtls_printf( "pid %d: SSL handshake ok\n", pid );
+
+        /*
+         * 6. Read the HTTP Request
+         */
+        mbedtls_printf( "pid %d: Start reading from client.\n", pid );
+        fflush( stdout );
+
+        do
+        {
+            len = sizeof( buf ) - 1;
+            memset( buf, 0, sizeof( buf ) );
+            ret = mbedtls_ssl_read( &ssl, buf, len );
+
+            if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
+                continue;
+
+            if( ret <= 0 )
+            {
+                switch( ret )
+                {
+                    case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                        mbedtls_printf( "pid %d: connection was closed gracefully\n", pid );
+                        break;
+
+                    case MBEDTLS_ERR_NET_CONN_RESET:
+                        mbedtls_printf( "pid %d: connection was reset by peer\n", pid );
+                        break;
+
+                    default:
+                        mbedtls_printf( "pid %d: mbedtls_ssl_read returned %d\n", pid, ret );
+                        break;
+                }
+
+                break;
+            }
+
+            len = ret;
+            mbedtls_printf( "pid %d: %d bytes read\n\n%s", pid, len, (char *) buf );
+
+            if( ret > 0 )
+                break;
+        }
+        while( 1 );
+
+        /*
+         * 7. Write the 200 Response
+         */
+        mbedtls_printf( "pid %d: Start writing to client.\n", pid );
+        fflush( stdout );
+
+        len = sprintf( (char *) buf, HTTP_RESPONSE,
+                mbedtls_ssl_get_ciphersuite( &ssl ) );
+
+        while( cnt++ < 100 )
+        {
+            while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
+            {
+                if( ret == MBEDTLS_ERR_NET_CONN_RESET )
+                {
+                    mbedtls_printf(
+                            "pid %d: Write failed!  peer closed the connection\n\n", pid );
+                    goto exit;
+                }
+
+                if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+                {
+                    mbedtls_printf(
+                            "pid %d: Write failed!  mbedtls_ssl_write returned %d\n\n",
+                            pid, ret );
+                    goto exit;
+                }
+            }
+            len = ret;
+            mbedtls_printf( "pid %d: %d bytes written\n\n%s\n", pid, len, (char *) buf );
+
+            mbedtls_net_usleep( 1000000 );
+        }
+
+        mbedtls_ssl_close_notify( &ssl );
+        goto exit;
+    }
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+    mbedtls_net_free( &client_fd );
+    mbedtls_net_free( &listen_fd );
+
+    mbedtls_x509_crt_free( &srvcert );
+    mbedtls_pk_free( &pkey );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+#if defined(_WIN32)
+    mbedtls_printf( "  Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    mbedtls_exit( exit_code );
+}
+#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
+          MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
+          MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_PARSE_C &&
+          ! _WIN32 */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_mail_client.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_mail_client.c
new file mode 100644
index 0000000..fb965f6
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_mail_client.c
@@ -0,0 +1,859 @@
+/*
+ *  SSL client for SMTP servers
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/* Enable definition of gethostname() even when compiling with -std=c99. Must
+ * be set before config.h, which pulls in glibc's features.h indirectly.
+ * Harmless on other platforms. */
+#define _POSIX_C_SOURCE 200112L
+#define _XOPEN_SOURCE 600
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_time            time
+#define mbedtls_time_t          time_t
+#define mbedtls_fprintf         fprintf
+#define mbedtls_printf          printf
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
+    !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
+    !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) ||         \
+    !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \
+    !defined(MBEDTLS_FS_IO)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
+           "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
+           "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
+           "not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/base64.h"
+#include "mbedtls/error.h"
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/certs.h"
+#include "mbedtls/x509.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
+
+#if defined(_WIN32) || defined(_WIN32_WCE)
+#include <winsock2.h>
+#include <windows.h>
+
+#if defined(_MSC_VER)
+#if defined(_WIN32_WCE)
+#pragma comment( lib, "ws2.lib" )
+#else
+#pragma comment( lib, "ws2_32.lib" )
+#endif
+#endif /* _MSC_VER */
+#endif
+
+#define DFL_SERVER_NAME         "localhost"
+#define DFL_SERVER_PORT         "465"
+#define DFL_USER_NAME           "user"
+#define DFL_USER_PWD            "password"
+#define DFL_MAIL_FROM           ""
+#define DFL_MAIL_TO             ""
+#define DFL_DEBUG_LEVEL         0
+#define DFL_CA_FILE             ""
+#define DFL_CRT_FILE            ""
+#define DFL_KEY_FILE            ""
+#define DFL_FORCE_CIPHER        0
+#define DFL_MODE                0
+#define DFL_AUTHENTICATION      0
+
+#define MODE_SSL_TLS            0
+#define MODE_STARTTLS           0
+
+#if defined(MBEDTLS_BASE64_C)
+#define USAGE_AUTH \
+    "    authentication=%%d   default: 0 (disabled)\n"          \
+    "    user_name=%%s        default: \"" DFL_USER_NAME "\"\n" \
+    "    user_pwd=%%s         default: \"" DFL_USER_PWD "\"\n"
+#else
+#define USAGE_AUTH \
+    "    authentication options disabled. (Require MBEDTLS_BASE64_C)\n"
+#endif /* MBEDTLS_BASE64_C */
+
+#if defined(MBEDTLS_FS_IO)
+#define USAGE_IO \
+    "    ca_file=%%s          default: \"\" (pre-loaded)\n" \
+    "    crt_file=%%s         default: \"\" (pre-loaded)\n" \
+    "    key_file=%%s         default: \"\" (pre-loaded)\n"
+#else
+#define USAGE_IO \
+    "    No file operations available (MBEDTLS_FS_IO not defined)\n"
+#endif /* MBEDTLS_FS_IO */
+
+#define USAGE \
+    "\n usage: ssl_mail_client param=<>...\n"                 \
+    "\n acceptable parameters:\n"                             \
+    "    server_name=%%s      default: " DFL_SERVER_NAME "\n" \
+    "    server_port=%%d      default: " DFL_SERVER_PORT "\n" \
+    "    debug_level=%%d      default: 0 (disabled)\n"        \
+    "    mode=%%d             default: 0 (SSL/TLS) (1 for STARTTLS)\n"  \
+    USAGE_AUTH                                                \
+    "    mail_from=%%s        default: \"\"\n"                \
+    "    mail_to=%%s          default: \"\"\n"                \
+    USAGE_IO                                                  \
+    "    force_ciphersuite=<name>    default: all enabled\n"  \
+    " acceptable ciphersuite names:\n"
+
+
+/*
+ * global options
+ */
+struct options
+{
+    const char *server_name;    /* hostname of the server (client only)     */
+    const char *server_port;    /* port on which the ssl service runs       */
+    int debug_level;            /* level of debugging                       */
+    int authentication;         /* if authentication is required            */
+    int mode;                   /* SSL/TLS (0) or STARTTLS (1)              */
+    const char *user_name;      /* username to use for authentication       */
+    const char *user_pwd;       /* password to use for authentication       */
+    const char *mail_from;      /* E-Mail address to use as sender          */
+    const char *mail_to;        /* E-Mail address to use as recipient       */
+    const char *ca_file;        /* the file with the CA certificate(s)      */
+    const char *crt_file;       /* the file with the client certificate     */
+    const char *key_file;       /* the file with the client key             */
+    int force_ciphersuite[2];   /* protocol/ciphersuite to use, or all      */
+} opt;
+
+static void my_debug( void *ctx, int level,
+                      const char *file, int line,
+                      const char *str )
+{
+    ((void) level);
+
+    mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
+    fflush(  (FILE *) ctx  );
+}
+
+static int do_handshake( mbedtls_ssl_context *ssl )
+{
+    int ret;
+    uint32_t flags;
+    unsigned char buf[1024];
+    memset(buf, 0, 1024);
+
+    /*
+     * 4. Handshake
+     */
+    mbedtls_printf( "  . Performing the SSL/TLS handshake..." );
+    fflush( stdout );
+
+    while( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+#if defined(MBEDTLS_ERROR_C)
+            mbedtls_strerror( ret, (char *) buf, 1024 );
+#endif
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned %d: %s\n\n", ret, buf );
+            return( -1 );
+        }
+    }
+
+    mbedtls_printf( " ok\n    [ Ciphersuite is %s ]\n",
+            mbedtls_ssl_get_ciphersuite( ssl ) );
+
+    /*
+     * 5. Verify the server certificate
+     */
+    mbedtls_printf( "  . Verifying peer X.509 certificate..." );
+
+    /* In real life, we probably want to bail out when ret != 0 */
+    if( ( flags = mbedtls_ssl_get_verify_result( ssl ) ) != 0 )
+    {
+        char vrfy_buf[512];
+
+        mbedtls_printf( " failed\n" );
+
+        mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), "  ! ", flags );
+
+        mbedtls_printf( "%s\n", vrfy_buf );
+    }
+    else
+        mbedtls_printf( " ok\n" );
+
+    mbedtls_printf( "  . Peer certificate information    ...\n" );
+    mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, "      ",
+                   mbedtls_ssl_get_peer_cert( ssl ) );
+    mbedtls_printf( "%s\n", buf );
+
+    return( 0 );
+}
+
+static int write_ssl_data( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
+{
+    int ret;
+
+    mbedtls_printf("\n%s", buf);
+    while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n", ret );
+            return -1;
+        }
+    }
+
+    return( 0 );
+}
+
+static int write_ssl_and_get_response( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
+{
+    int ret;
+    unsigned char data[128];
+    char code[4];
+    size_t i, idx = 0;
+
+    mbedtls_printf("\n%s", buf);
+    while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n", ret );
+            return -1;
+        }
+    }
+
+    do
+    {
+        len = sizeof( data ) - 1;
+        memset( data, 0, sizeof( data ) );
+        ret = mbedtls_ssl_read( ssl, data, len );
+
+        if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
+            continue;
+
+        if( ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY )
+            return -1;
+
+        if( ret <= 0 )
+        {
+            mbedtls_printf( "failed\n  ! mbedtls_ssl_read returned %d\n\n", ret );
+            return -1;
+        }
+
+        mbedtls_printf("\n%s", data);
+        len = ret;
+        for( i = 0; i < len; i++ )
+        {
+            if( data[i] != '\n' )
+            {
+                if( idx < 4 )
+                    code[ idx++ ] = data[i];
+                continue;
+            }
+
+            if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
+            {
+                code[3] = '\0';
+                return atoi( code );
+            }
+
+            idx = 0;
+        }
+    }
+    while( 1 );
+}
+
+static int write_and_get_response( mbedtls_net_context *sock_fd, unsigned char *buf, size_t len )
+{
+    int ret;
+    unsigned char data[128];
+    char code[4];
+    size_t i, idx = 0;
+
+    mbedtls_printf("\n%s", buf);
+    if( len && ( ret = mbedtls_net_send( sock_fd, buf, len ) ) <= 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_send returned %d\n\n", ret );
+            return -1;
+    }
+
+    do
+    {
+        len = sizeof( data ) - 1;
+        memset( data, 0, sizeof( data ) );
+        ret = mbedtls_net_recv( sock_fd, data, len );
+
+        if( ret <= 0 )
+        {
+            mbedtls_printf( "failed\n  ! mbedtls_net_recv returned %d\n\n", ret );
+            return -1;
+        }
+
+        data[len] = '\0';
+        mbedtls_printf("\n%s", data);
+        len = ret;
+        for( i = 0; i < len; i++ )
+        {
+            if( data[i] != '\n' )
+            {
+                if( idx < 4 )
+                    code[ idx++ ] = data[i];
+                continue;
+            }
+
+            if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
+            {
+                code[3] = '\0';
+                return atoi( code );
+            }
+
+            idx = 0;
+        }
+    }
+    while( 1 );
+}
+
+int main( int argc, char *argv[] )
+{
+    int ret = 1, len;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_net_context server_fd;
+#if defined(MBEDTLS_BASE64_C)
+    unsigned char base[1024];
+    /* buf is used as the destination buffer for printing base with the format:
+     * "%s\r\n". Hence, the size of buf should be at least the size of base
+     * plus 2 bytes for the \r and \n characters.
+     */
+    unsigned char buf[sizeof( base ) + 2];
+#else
+    unsigned char buf[1024];
+#endif
+    char hostname[32];
+    const char *pers = "ssl_mail_client";
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_x509_crt cacert;
+    mbedtls_x509_crt clicert;
+    mbedtls_pk_context pkey;
+    int i;
+    size_t n;
+    char *p, *q;
+    const int *list;
+
+    /*
+     * Make sure memory references are valid in case we exit early.
+     */
+    mbedtls_net_init( &server_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    memset( &buf, 0, sizeof( buf ) );
+    mbedtls_x509_crt_init( &cacert );
+    mbedtls_x509_crt_init( &clicert );
+    mbedtls_pk_init( &pkey );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    if( argc == 0 )
+    {
+    usage:
+        mbedtls_printf( USAGE );
+
+        list = mbedtls_ssl_list_ciphersuites();
+        while( *list )
+        {
+            mbedtls_printf("    %s\n", mbedtls_ssl_get_ciphersuite_name( *list ) );
+            list++;
+        }
+        mbedtls_printf("\n");
+        goto exit;
+    }
+
+    opt.server_name         = DFL_SERVER_NAME;
+    opt.server_port         = DFL_SERVER_PORT;
+    opt.debug_level         = DFL_DEBUG_LEVEL;
+    opt.authentication      = DFL_AUTHENTICATION;
+    opt.mode                = DFL_MODE;
+    opt.user_name           = DFL_USER_NAME;
+    opt.user_pwd            = DFL_USER_PWD;
+    opt.mail_from           = DFL_MAIL_FROM;
+    opt.mail_to             = DFL_MAIL_TO;
+    opt.ca_file             = DFL_CA_FILE;
+    opt.crt_file            = DFL_CRT_FILE;
+    opt.key_file            = DFL_KEY_FILE;
+    opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
+
+    for( i = 1; i < argc; i++ )
+    {
+        p = argv[i];
+        if( ( q = strchr( p, '=' ) ) == NULL )
+            goto usage;
+        *q++ = '\0';
+
+        if( strcmp( p, "server_name" ) == 0 )
+            opt.server_name = q;
+        else if( strcmp( p, "server_port" ) == 0 )
+            opt.server_port = q;
+        else if( strcmp( p, "debug_level" ) == 0 )
+        {
+            opt.debug_level = atoi( q );
+            if( opt.debug_level < 0 || opt.debug_level > 65535 )
+                goto usage;
+        }
+        else if( strcmp( p, "authentication" ) == 0 )
+        {
+            opt.authentication = atoi( q );
+            if( opt.authentication < 0 || opt.authentication > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "mode" ) == 0 )
+        {
+            opt.mode = atoi( q );
+            if( opt.mode < 0 || opt.mode > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "user_name" ) == 0 )
+            opt.user_name = q;
+        else if( strcmp( p, "user_pwd" ) == 0 )
+            opt.user_pwd = q;
+        else if( strcmp( p, "mail_from" ) == 0 )
+            opt.mail_from = q;
+        else if( strcmp( p, "mail_to" ) == 0 )
+            opt.mail_to = q;
+        else if( strcmp( p, "ca_file" ) == 0 )
+            opt.ca_file = q;
+        else if( strcmp( p, "crt_file" ) == 0 )
+            opt.crt_file = q;
+        else if( strcmp( p, "key_file" ) == 0 )
+            opt.key_file = q;
+        else if( strcmp( p, "force_ciphersuite" ) == 0 )
+        {
+            opt.force_ciphersuite[0] = -1;
+
+            opt.force_ciphersuite[0] = mbedtls_ssl_get_ciphersuite_id( q );
+
+            if( opt.force_ciphersuite[0] <= 0 )
+                goto usage;
+
+            opt.force_ciphersuite[1] = 0;
+        }
+        else
+            goto usage;
+    }
+
+    /*
+     * 0. Initialize the RNG and the session data
+     */
+    mbedtls_printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    mbedtls_entropy_init( &entropy );
+    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
+                               (const unsigned char *) pers,
+                               strlen( pers ) ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 1.1. Load the trusted CA
+     */
+    mbedtls_printf( "  . Loading the CA root certificate ..." );
+    fflush( stdout );
+
+#if defined(MBEDTLS_FS_IO)
+    if( strlen( opt.ca_file ) )
+        ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file );
+    else
+#endif
+#if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_PEM_PARSE_C)
+        ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
+                              mbedtls_test_cas_pem_len );
+#else
+    {
+        mbedtls_printf("MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined.");
+        goto exit;
+    }
+#endif
+    if( ret < 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok (%d skipped)\n", ret );
+
+    /*
+     * 1.2. Load own certificate and private key
+     *
+     * (can be skipped if client authentication is not required)
+     */
+    mbedtls_printf( "  . Loading the client cert. and key..." );
+    fflush( stdout );
+
+#if defined(MBEDTLS_FS_IO)
+    if( strlen( opt.crt_file ) )
+        ret = mbedtls_x509_crt_parse_file( &clicert, opt.crt_file );
+    else
+#endif
+#if defined(MBEDTLS_CERTS_C)
+        ret = mbedtls_x509_crt_parse( &clicert, (const unsigned char *) mbedtls_test_cli_crt,
+                              mbedtls_test_cli_crt_len );
+#else
+    {
+        mbedtls_printf("MBEDTLS_CERTS_C not defined.");
+        goto exit;
+    }
+#endif
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+#if defined(MBEDTLS_FS_IO)
+    if( strlen( opt.key_file ) )
+        ret = mbedtls_pk_parse_keyfile( &pkey, opt.key_file, "" );
+    else
+#endif
+#if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_PEM_PARSE_C)
+        ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_cli_key,
+                mbedtls_test_cli_key_len, NULL, 0 );
+#else
+    {
+        mbedtls_printf("MBEDTLS_CERTS_C or MBEDTLS_PEM_PARSE_C not defined.");
+        goto exit;
+    }
+#endif
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_pk_parse_key returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 2. Start the connection
+     */
+    mbedtls_printf( "  . Connecting to tcp/%s/%s...", opt.server_name,
+                                                opt.server_port );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name,
+                             opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_connect returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 3. Setup stuff
+     */
+    mbedtls_printf( "  . Setting up the SSL/TLS structure..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                    MBEDTLS_SSL_IS_CLIENT,
+                    MBEDTLS_SSL_TRANSPORT_STREAM,
+                    MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /* OPTIONAL is not optimal for security,
+     * but makes interop easier in this simplified example */
+    mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
+
+    mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+    mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+
+    if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
+        mbedtls_ssl_conf_ciphersuites( &conf, opt.force_ciphersuite );
+
+    mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
+    if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &clicert, &pkey ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
+
+    mbedtls_printf( " ok\n" );
+
+    if( opt.mode == MODE_SSL_TLS )
+    {
+        if( do_handshake( &ssl ) != 0 )
+            goto exit;
+
+        mbedtls_printf( "  > Get header from server:" );
+        fflush( stdout );
+
+        ret = write_ssl_and_get_response( &ssl, buf, 0 );
+        if( ret < 200 || ret > 299 )
+        {
+            mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+            goto exit;
+        }
+
+        mbedtls_printf(" ok\n" );
+
+        mbedtls_printf( "  > Write EHLO to server:" );
+        fflush( stdout );
+
+        gethostname( hostname, 32 );
+        len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
+        ret = write_ssl_and_get_response( &ssl, buf, len );
+        if( ret < 200 || ret > 299 )
+        {
+            mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+            goto exit;
+        }
+    }
+    else
+    {
+        mbedtls_printf( "  > Get header from server:" );
+        fflush( stdout );
+
+        ret = write_and_get_response( &server_fd, buf, 0 );
+        if( ret < 200 || ret > 299 )
+        {
+            mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+            goto exit;
+        }
+
+        mbedtls_printf(" ok\n" );
+
+        mbedtls_printf( "  > Write EHLO to server:" );
+        fflush( stdout );
+
+        gethostname( hostname, 32 );
+        len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
+        ret = write_and_get_response( &server_fd, buf, len );
+        if( ret < 200 || ret > 299 )
+        {
+            mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+            goto exit;
+        }
+
+        mbedtls_printf(" ok\n" );
+
+        mbedtls_printf( "  > Write STARTTLS to server:" );
+        fflush( stdout );
+
+        gethostname( hostname, 32 );
+        len = sprintf( (char *) buf, "STARTTLS\r\n" );
+        ret = write_and_get_response( &server_fd, buf, len );
+        if( ret < 200 || ret > 299 )
+        {
+            mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+            goto exit;
+        }
+
+        mbedtls_printf(" ok\n" );
+
+        if( do_handshake( &ssl ) != 0 )
+            goto exit;
+    }
+
+#if defined(MBEDTLS_BASE64_C)
+    if( opt.authentication )
+    {
+        mbedtls_printf( "  > Write AUTH LOGIN to server:" );
+        fflush( stdout );
+
+        len = sprintf( (char *) buf, "AUTH LOGIN\r\n" );
+        ret = write_ssl_and_get_response( &ssl, buf, len );
+        if( ret < 200 || ret > 399 )
+        {
+            mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+            goto exit;
+        }
+
+        mbedtls_printf(" ok\n" );
+
+        mbedtls_printf( "  > Write username to server: %s", opt.user_name );
+        fflush( stdout );
+
+        ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_name,
+                             strlen( opt.user_name ) );
+
+        if( ret != 0 ) {
+            mbedtls_printf( " failed\n  ! mbedtls_base64_encode returned %d\n\n", ret );
+            goto exit;
+        }
+        len = sprintf( (char *) buf, "%s\r\n", base );
+        ret = write_ssl_and_get_response( &ssl, buf, len );
+        if( ret < 300 || ret > 399 )
+        {
+            mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+            goto exit;
+        }
+
+        mbedtls_printf(" ok\n" );
+
+        mbedtls_printf( "  > Write password to server: %s", opt.user_pwd );
+        fflush( stdout );
+
+        ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_pwd,
+                             strlen( opt.user_pwd ) );
+
+        if( ret != 0 ) {
+            mbedtls_printf( " failed\n  ! mbedtls_base64_encode returned %d\n\n", ret );
+            goto exit;
+        }
+        len = sprintf( (char *) buf, "%s\r\n", base );
+        ret = write_ssl_and_get_response( &ssl, buf, len );
+        if( ret < 200 || ret > 399 )
+        {
+            mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+            goto exit;
+        }
+
+        mbedtls_printf(" ok\n" );
+    }
+#endif
+
+    mbedtls_printf( "  > Write MAIL FROM to server:" );
+    fflush( stdout );
+
+    len = sprintf( (char *) buf, "MAIL FROM:<%s>\r\n", opt.mail_from );
+    ret = write_ssl_and_get_response( &ssl, buf, len );
+    if( ret < 200 || ret > 299 )
+    {
+        mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf(" ok\n" );
+
+    mbedtls_printf( "  > Write RCPT TO to server:" );
+    fflush( stdout );
+
+    len = sprintf( (char *) buf, "RCPT TO:<%s>\r\n", opt.mail_to );
+    ret = write_ssl_and_get_response( &ssl, buf, len );
+    if( ret < 200 || ret > 299 )
+    {
+        mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf(" ok\n" );
+
+    mbedtls_printf( "  > Write DATA to server:" );
+    fflush( stdout );
+
+    len = sprintf( (char *) buf, "DATA\r\n" );
+    ret = write_ssl_and_get_response( &ssl, buf, len );
+    if( ret < 300 || ret > 399 )
+    {
+        mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf(" ok\n" );
+
+    mbedtls_printf( "  > Write content to server:" );
+    fflush( stdout );
+
+    len = sprintf( (char *) buf, "From: %s\r\nSubject: mbed TLS Test mail\r\n\r\n"
+            "This is a simple test mail from the "
+            "mbed TLS mail client example.\r\n"
+            "\r\n"
+            "Enjoy!", opt.mail_from );
+    ret = write_ssl_data( &ssl, buf, len );
+
+    len = sprintf( (char *) buf, "\r\n.\r\n");
+    ret = write_ssl_and_get_response( &ssl, buf, len );
+    if( ret < 200 || ret > 299 )
+    {
+        mbedtls_printf( " failed\n  ! server responded with %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf(" ok\n" );
+
+    mbedtls_ssl_close_notify( &ssl );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    mbedtls_net_free( &server_fd );
+    mbedtls_x509_crt_free( &clicert );
+    mbedtls_x509_crt_free( &cacert );
+    mbedtls_pk_free( &pkey );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+#if defined(_WIN32)
+    mbedtls_printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    mbedtls_exit( exit_code );
+}
+#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
+          MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C **
+          MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_pthread_server.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_pthread_server.c
new file mode 100644
index 0000000..c4c6ef1
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_pthread_server.c
@@ -0,0 +1,533 @@
+/*
+ *  SSL server demonstration program using pthread for handling multiple
+ *  clients.
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_fprintf    fprintf
+#define mbedtls_printf     printf
+#define mbedtls_snprintf   snprintf
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) ||            \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) ||         \
+    !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) ||             \
+    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) ||            \
+    !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) ||      \
+    !defined(MBEDTLS_THREADING_C) || !defined(MBEDTLS_THREADING_PTHREAD) || \
+    !defined(MBEDTLS_PEM_PARSE_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
+           "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
+           "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
+           "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
+           "MBEDTLS_THREADING_C and/or MBEDTLS_THREADING_PTHREAD "
+           "and/or MBEDTLS_PEM_PARSE_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include <stdlib.h>
+#include <string.h>
+
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/certs.h"
+#include "mbedtls/x509.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/error.h"
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+#include "mbedtls/ssl_cache.h"
+#endif
+
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+#include "mbedtls/memory_buffer_alloc.h"
+#endif
+
+
+#define HTTP_RESPONSE \
+    "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
+    "<h2>mbed TLS Test Server</h2>\r\n" \
+    "<p>Successful connection using: %s</p>\r\n"
+
+#define DEBUG_LEVEL 0
+
+#define MAX_NUM_THREADS 5
+
+mbedtls_threading_mutex_t debug_mutex;
+
+static void my_mutexed_debug( void *ctx, int level,
+                      const char *file, int line,
+                      const char *str )
+{
+    long int thread_id = (long int) pthread_self();
+
+    mbedtls_mutex_lock( &debug_mutex );
+
+    ((void) level);
+    mbedtls_fprintf( (FILE *) ctx, "%s:%04d: [ #%ld ] %s",
+                                    file, line, thread_id, str );
+    fflush(  (FILE *) ctx  );
+
+    mbedtls_mutex_unlock( &debug_mutex );
+}
+
+typedef struct {
+    mbedtls_net_context client_fd;
+    int thread_complete;
+    const mbedtls_ssl_config *config;
+} thread_info_t;
+
+typedef struct {
+    int active;
+    thread_info_t   data;
+    pthread_t       thread;
+} pthread_info_t;
+
+static thread_info_t    base_info;
+static pthread_info_t   threads[MAX_NUM_THREADS];
+
+static void *handle_ssl_connection( void *data )
+{
+    int ret, len;
+    thread_info_t *thread_info = (thread_info_t *) data;
+    mbedtls_net_context *client_fd = &thread_info->client_fd;
+    long int thread_id = (long int) pthread_self();
+    unsigned char buf[1024];
+    mbedtls_ssl_context ssl;
+
+    /* Make sure memory references are valid */
+    mbedtls_ssl_init( &ssl );
+
+    mbedtls_printf( "  [ #%ld ]  Setting up SSL/TLS data\n", thread_id );
+
+    /*
+     * 4. Get the SSL context ready
+     */
+    if( ( ret = mbedtls_ssl_setup( &ssl, thread_info->config ) ) != 0 )
+    {
+        mbedtls_printf( "  [ #%ld ]  failed: mbedtls_ssl_setup returned -0x%04x\n",
+                thread_id, ( unsigned int ) -ret );
+        goto thread_exit;
+    }
+
+    mbedtls_ssl_set_bio( &ssl, client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
+
+    /*
+     * 5. Handshake
+     */
+    mbedtls_printf( "  [ #%ld ]  Performing the SSL/TLS handshake\n", thread_id );
+
+    while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( "  [ #%ld ]  failed: mbedtls_ssl_handshake returned -0x%04x\n",
+                    thread_id, ( unsigned int ) -ret );
+            goto thread_exit;
+        }
+    }
+
+    mbedtls_printf( "  [ #%ld ]  ok\n", thread_id );
+
+    /*
+     * 6. Read the HTTP Request
+     */
+    mbedtls_printf( "  [ #%ld ]  < Read from client\n", thread_id );
+
+    do
+    {
+        len = sizeof( buf ) - 1;
+        memset( buf, 0, sizeof( buf ) );
+        ret = mbedtls_ssl_read( &ssl, buf, len );
+
+        if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
+            continue;
+
+        if( ret <= 0 )
+        {
+            switch( ret )
+            {
+                case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                    mbedtls_printf( "  [ #%ld ]  connection was closed gracefully\n",
+                            thread_id );
+                    goto thread_exit;
+
+                case MBEDTLS_ERR_NET_CONN_RESET:
+                    mbedtls_printf( "  [ #%ld ]  connection was reset by peer\n",
+                            thread_id );
+                    goto thread_exit;
+
+                default:
+                    mbedtls_printf( "  [ #%ld ]  mbedtls_ssl_read returned -0x%04x\n",
+                            thread_id, ( unsigned int ) -ret );
+                    goto thread_exit;
+            }
+        }
+
+        len = ret;
+        mbedtls_printf( "  [ #%ld ]  %d bytes read\n=====\n%s\n=====\n",
+                thread_id, len, (char *) buf );
+
+        if( ret > 0 )
+            break;
+    }
+    while( 1 );
+
+    /*
+     * 7. Write the 200 Response
+     */
+    mbedtls_printf( "  [ #%ld ]  > Write to client:\n", thread_id );
+
+    len = sprintf( (char *) buf, HTTP_RESPONSE,
+                   mbedtls_ssl_get_ciphersuite( &ssl ) );
+
+    while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
+    {
+        if( ret == MBEDTLS_ERR_NET_CONN_RESET )
+        {
+            mbedtls_printf( "  [ #%ld ]  failed: peer closed the connection\n",
+                    thread_id );
+            goto thread_exit;
+        }
+
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( "  [ #%ld ]  failed: mbedtls_ssl_write returned -0x%04x\n",
+                    thread_id, ( unsigned int ) ret );
+            goto thread_exit;
+        }
+    }
+
+    len = ret;
+    mbedtls_printf( "  [ #%ld ]  %d bytes written\n=====\n%s\n=====\n",
+            thread_id, len, (char *) buf );
+
+    mbedtls_printf( "  [ #%ld ]  . Closing the connection...", thread_id );
+
+    while( ( ret = mbedtls_ssl_close_notify( &ssl ) ) < 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
+            ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( "  [ #%ld ]  failed: mbedtls_ssl_close_notify returned -0x%04x\n",
+                    thread_id, ( unsigned int ) ret );
+            goto thread_exit;
+        }
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    ret = 0;
+
+thread_exit:
+
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf("  [ #%ld ]  Last error was: -0x%04x - %s\n\n",
+               thread_id, ( unsigned int ) -ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( client_fd );
+    mbedtls_ssl_free( &ssl );
+
+    thread_info->thread_complete = 1;
+
+    return( NULL );
+}
+
+static int thread_create( mbedtls_net_context *client_fd )
+{
+    int ret, i;
+
+    /*
+     * Find in-active or finished thread slot
+     */
+    for( i = 0; i < MAX_NUM_THREADS; i++ )
+    {
+        if( threads[i].active == 0 )
+            break;
+
+        if( threads[i].data.thread_complete == 1 )
+        {
+            mbedtls_printf( "  [ main ]  Cleaning up thread %d\n", i );
+            pthread_join(threads[i].thread, NULL );
+            memset( &threads[i], 0, sizeof(pthread_info_t) );
+            break;
+        }
+    }
+
+    if( i == MAX_NUM_THREADS )
+        return( -1 );
+
+    /*
+     * Fill thread-info for thread
+     */
+    memcpy( &threads[i].data, &base_info, sizeof(base_info) );
+    threads[i].active = 1;
+    memcpy( &threads[i].data.client_fd, client_fd, sizeof( mbedtls_net_context ) );
+
+    if( ( ret = pthread_create( &threads[i].thread, NULL, handle_ssl_connection,
+                                &threads[i].data ) ) != 0 )
+    {
+        return( ret );
+    }
+
+    return( 0 );
+}
+
+int main( void )
+{
+    int ret;
+    mbedtls_net_context listen_fd, client_fd;
+    const char pers[] = "ssl_pthread_server";
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_ssl_config conf;
+    mbedtls_x509_crt srvcert;
+    mbedtls_x509_crt cachain;
+    mbedtls_pk_context pkey;
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+    unsigned char alloc_buf[100000];
+#endif
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_context cache;
+#endif
+
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+    mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
+#endif
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_init( &cache );
+#endif
+
+    mbedtls_x509_crt_init( &srvcert );
+    mbedtls_x509_crt_init( &cachain );
+
+    mbedtls_ssl_config_init( &conf );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+    memset( threads, 0, sizeof(threads) );
+    mbedtls_net_init( &listen_fd );
+    mbedtls_net_init( &client_fd );
+
+    mbedtls_mutex_init( &debug_mutex );
+
+    base_info.config = &conf;
+
+    /*
+     * We use only a single entropy source that is used in all the threads.
+     */
+    mbedtls_entropy_init( &entropy );
+
+    /*
+     * 1. Load the certificates and private RSA key
+     */
+    mbedtls_printf( "\n  . Loading the server cert. and key..." );
+    fflush( stdout );
+
+    /*
+     * This demonstration program uses embedded test certificates.
+     * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
+     * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
+     */
+    ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
+                          mbedtls_test_srv_crt_len );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_x509_crt_parse( &cachain, (const unsigned char *) mbedtls_test_cas_pem,
+                          mbedtls_test_cas_pem_len );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_pk_init( &pkey );
+    ret =  mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
+                         mbedtls_test_srv_key_len, NULL, 0 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_pk_parse_key returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 1b. Seed the random number generator
+     */
+    mbedtls_printf( "  . Seeding the random number generator..." );
+
+    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
+                               (const unsigned char *) pers,
+                               strlen( pers ) ) ) != 0 )
+    {
+        mbedtls_printf( " failed: mbedtls_ctr_drbg_seed returned -0x%04x\n",
+                ( unsigned int ) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 1c. Prepare SSL configuration
+     */
+    mbedtls_printf( "  . Setting up the SSL data...." );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                    MBEDTLS_SSL_IS_SERVER,
+                    MBEDTLS_SSL_TRANSPORT_STREAM,
+                    MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed: mbedtls_ssl_config_defaults returned -0x%04x\n",
+                ( unsigned int ) -ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+    mbedtls_ssl_conf_dbg( &conf, my_mutexed_debug, stdout );
+
+    /* mbedtls_ssl_cache_get() and mbedtls_ssl_cache_set() are thread-safe if
+     * MBEDTLS_THREADING_C is set.
+     */
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_conf_session_cache( &conf, &cache,
+                                   mbedtls_ssl_cache_get,
+                                   mbedtls_ssl_cache_set );
+#endif
+
+    mbedtls_ssl_conf_ca_chain( &conf, &cachain, NULL );
+    if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 2. Setup the listening TCP socket
+     */
+    mbedtls_printf( "  . Bind on https://localhost:4433/ ..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_bind returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+reset:
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf( "  [ main ]  Last error was: -0x%04x - %s\n", ( unsigned int ) -ret,
+                        error_buf );
+    }
+#endif
+
+    /*
+     * 3. Wait until a client connects
+     */
+    mbedtls_printf( "  [ main ]  Waiting for a remote connection\n" );
+
+    if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
+                                    NULL, 0, NULL ) ) != 0 )
+    {
+        mbedtls_printf( "  [ main ] failed: mbedtls_net_accept returned -0x%04x\n",
+                        ( unsigned int ) ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "  [ main ]  ok\n" );
+    mbedtls_printf( "  [ main ]  Creating a new thread\n" );
+
+    if( ( ret = thread_create( &client_fd ) ) != 0 )
+    {
+        mbedtls_printf( "  [ main ]  failed: thread_create returned %d\n", ret );
+        mbedtls_net_free( &client_fd );
+        goto reset;
+    }
+
+    ret = 0;
+    goto reset;
+
+exit:
+    mbedtls_x509_crt_free( &srvcert );
+    mbedtls_pk_free( &pkey );
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_free( &cache );
+#endif
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+    mbedtls_ssl_config_free( &conf );
+
+    mbedtls_net_free( &listen_fd );
+
+    mbedtls_mutex_free( &debug_mutex );
+
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+    mbedtls_memory_buffer_alloc_free();
+#endif
+
+#if defined(_WIN32)
+    mbedtls_printf( "  Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    mbedtls_exit( ret );
+}
+
+#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
+          MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
+          MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_THREADING_C &&
+          MBEDTLS_THREADING_PTHREAD && MBEDTLS_PEM_PARSE_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_server.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_server.c
new file mode 100644
index 0000000..0124338
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_server.c
@@ -0,0 +1,403 @@
+/*
+ *  SSL server demonstration program
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_time       time
+#define mbedtls_time_t     time_t
+#define mbedtls_fprintf    fprintf
+#define mbedtls_printf     printf
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) ||    \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
+    !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) ||     \
+    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) ||    \
+    !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
+    !defined(MBEDTLS_PEM_PARSE_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
+           "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
+           "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
+           "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
+           "and/or MBEDTLS_PEM_PARSE_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include <stdlib.h>
+#include <string.h>
+
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/certs.h"
+#include "mbedtls/x509.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/error.h"
+#include "mbedtls/debug.h"
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+#include "mbedtls/ssl_cache.h"
+#endif
+
+#define HTTP_RESPONSE \
+    "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
+    "<h2>mbed TLS Test Server</h2>\r\n" \
+    "<p>Successful connection using: %s</p>\r\n"
+
+#define DEBUG_LEVEL 0
+
+
+static void my_debug( void *ctx, int level,
+                      const char *file, int line,
+                      const char *str )
+{
+    ((void) level);
+
+    mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
+    fflush(  (FILE *) ctx  );
+}
+
+int main( void )
+{
+    int ret, len;
+    mbedtls_net_context listen_fd, client_fd;
+    unsigned char buf[1024];
+    const char *pers = "ssl_server";
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+    mbedtls_x509_crt srvcert;
+    mbedtls_pk_context pkey;
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_context cache;
+#endif
+
+    mbedtls_net_init( &listen_fd );
+    mbedtls_net_init( &client_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_init( &cache );
+#endif
+    mbedtls_x509_crt_init( &srvcert );
+    mbedtls_pk_init( &pkey );
+    mbedtls_entropy_init( &entropy );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+#if defined(MBEDTLS_DEBUG_C)
+    mbedtls_debug_set_threshold( DEBUG_LEVEL );
+#endif
+
+    /*
+     * 1. Load the certificates and private RSA key
+     */
+    mbedtls_printf( "\n  . Loading the server cert. and key..." );
+    fflush( stdout );
+
+    /*
+     * This demonstration program uses embedded test certificates.
+     * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
+     * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
+     */
+    ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
+                          mbedtls_test_srv_crt_len );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
+                          mbedtls_test_cas_pem_len );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret );
+        goto exit;
+    }
+
+    ret =  mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
+                         mbedtls_test_srv_key_len, NULL, 0 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_pk_parse_key returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 2. Setup the listening TCP socket
+     */
+    mbedtls_printf( "  . Bind on https://localhost:4433/ ..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_bind returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 3. Seed the RNG
+     */
+    mbedtls_printf( "  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
+                               (const unsigned char *) pers,
+                               strlen( pers ) ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 4. Setup stuff
+     */
+    mbedtls_printf( "  . Setting up the SSL data...." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                    MBEDTLS_SSL_IS_SERVER,
+                    MBEDTLS_SSL_TRANSPORT_STREAM,
+                    MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+    mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_conf_session_cache( &conf, &cache,
+                                   mbedtls_ssl_cache_get,
+                                   mbedtls_ssl_cache_set );
+#endif
+
+    mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
+    if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+reset:
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( &client_fd );
+
+    mbedtls_ssl_session_reset( &ssl );
+
+    /*
+     * 3. Wait until a client connects
+     */
+    mbedtls_printf( "  . Waiting for a remote connection ..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
+                                    NULL, 0, NULL ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_accept returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 5. Handshake
+     */
+    mbedtls_printf( "  . Performing the SSL/TLS handshake..." );
+    fflush( stdout );
+
+    while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned %d\n\n", ret );
+            goto reset;
+        }
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 6. Read the HTTP Request
+     */
+    mbedtls_printf( "  < Read from client:" );
+    fflush( stdout );
+
+    do
+    {
+        len = sizeof( buf ) - 1;
+        memset( buf, 0, sizeof( buf ) );
+        ret = mbedtls_ssl_read( &ssl, buf, len );
+
+        if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
+            continue;
+
+        if( ret <= 0 )
+        {
+            switch( ret )
+            {
+                case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                    mbedtls_printf( " connection was closed gracefully\n" );
+                    break;
+
+                case MBEDTLS_ERR_NET_CONN_RESET:
+                    mbedtls_printf( " connection was reset by peer\n" );
+                    break;
+
+                default:
+                    mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n", (unsigned int) -ret );
+                    break;
+            }
+
+            break;
+        }
+
+        len = ret;
+        mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
+
+        if( ret > 0 )
+            break;
+    }
+    while( 1 );
+
+    /*
+     * 7. Write the 200 Response
+     */
+    mbedtls_printf( "  > Write to client:" );
+    fflush( stdout );
+
+    len = sprintf( (char *) buf, HTTP_RESPONSE,
+                   mbedtls_ssl_get_ciphersuite( &ssl ) );
+
+    while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
+    {
+        if( ret == MBEDTLS_ERR_NET_CONN_RESET )
+        {
+            mbedtls_printf( " failed\n  ! peer closed the connection\n\n" );
+            goto reset;
+        }
+
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n", ret );
+            goto exit;
+        }
+    }
+
+    len = ret;
+    mbedtls_printf( " %d bytes written\n\n%s\n", len, (char *) buf );
+
+    mbedtls_printf( "  . Closing the connection..." );
+
+    while( ( ret = mbedtls_ssl_close_notify( &ssl ) ) < 0 )
+    {
+        if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
+            ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_close_notify returned %d\n\n", ret );
+            goto reset;
+        }
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    ret = 0;
+    goto reset;
+
+exit:
+
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( &client_fd );
+    mbedtls_net_free( &listen_fd );
+
+    mbedtls_x509_crt_free( &srvcert );
+    mbedtls_pk_free( &pkey );
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_free( &cache );
+#endif
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+#if defined(_WIN32)
+    mbedtls_printf( "  Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    mbedtls_exit( ret );
+}
+#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
+          MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
+          MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C
+          && MBEDTLS_FS_IO && MBEDTLS_PEM_PARSE_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_server2.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_server2.c
new file mode 100644
index 0000000..bd4dbb6
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_server2.c
@@ -0,0 +1,4051 @@
+/*
+ *  SSL client with options
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include "ssl_test_lib.h"
+
+#if defined(MBEDTLS_SSL_TEST_IMPOSSIBLE)
+int main( void )
+{
+    mbedtls_printf( MBEDTLS_SSL_TEST_IMPOSSIBLE );
+    mbedtls_exit( 0 );
+}
+#elif !defined(MBEDTLS_SSL_SRV_C)
+int main( void )
+{
+    mbedtls_printf( "MBEDTLS_SSL_SRV_C not defined.\n" );
+    mbedtls_exit( 0 );
+}
+#else /* !MBEDTLS_SSL_TEST_IMPOSSIBLE && MBEDTLS_SSL_SRV_C */
+
+#include <stdint.h>
+
+#if !defined(_MSC_VER)
+#include <inttypes.h>
+#endif
+
+#if !defined(_WIN32)
+#include <signal.h>
+#endif
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+#include "mbedtls/ssl_cache.h"
+#endif
+
+#if defined(MBEDTLS_SSL_TICKET_C)
+#include "mbedtls/ssl_ticket.h"
+#endif
+
+#if defined(MBEDTLS_SSL_COOKIE_C)
+#include "mbedtls/ssl_cookie.h"
+#endif
+
+#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) && defined(MBEDTLS_FS_IO)
+#define SNI_OPTION
+#endif
+
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
+/* Size of memory to be allocated for the heap, when using the library's memory
+ * management and MBEDTLS_MEMORY_BUFFER_ALLOC_C is enabled. */
+#define MEMORY_HEAP_SIZE        120000
+
+#define DFL_SERVER_ADDR         NULL
+#define DFL_SERVER_PORT         "4433"
+#define DFL_RESPONSE_SIZE       -1
+#define DFL_DEBUG_LEVEL         0
+#define DFL_NBIO                0
+#define DFL_EVENT               0
+#define DFL_READ_TIMEOUT        0
+#define DFL_CA_FILE             ""
+#define DFL_CA_PATH             ""
+#define DFL_CRT_FILE            ""
+#define DFL_KEY_FILE            ""
+#define DFL_KEY_PWD             ""
+#define DFL_CRT_FILE2           ""
+#define DFL_KEY_FILE2           ""
+#define DFL_KEY_PWD2            ""
+#define DFL_ASYNC_OPERATIONS    "-"
+#define DFL_ASYNC_PRIVATE_DELAY1 ( -1 )
+#define DFL_ASYNC_PRIVATE_DELAY2 ( -1 )
+#define DFL_ASYNC_PRIVATE_ERROR  ( 0 )
+#define DFL_PSK                 ""
+#define DFL_PSK_OPAQUE          0
+#define DFL_PSK_LIST_OPAQUE     0
+#define DFL_PSK_IDENTITY        "Client_identity"
+#define DFL_ECJPAKE_PW          NULL
+#define DFL_PSK_LIST            NULL
+#define DFL_FORCE_CIPHER        0
+#define DFL_VERSION_SUITES      NULL
+#define DFL_RENEGOTIATION       MBEDTLS_SSL_RENEGOTIATION_DISABLED
+#define DFL_ALLOW_LEGACY        -2
+#define DFL_RENEGOTIATE         0
+#define DFL_RENEGO_DELAY        -2
+#define DFL_RENEGO_PERIOD       ( (uint64_t)-1 )
+#define DFL_EXCHANGES           1
+#define DFL_MIN_VERSION         -1
+#define DFL_MAX_VERSION         -1
+#define DFL_ARC4                -1
+#define DFL_SHA1                -1
+#define DFL_CID_ENABLED         0
+#define DFL_CID_VALUE           ""
+#define DFL_CID_ENABLED_RENEGO  -1
+#define DFL_CID_VALUE_RENEGO    NULL
+#define DFL_AUTH_MODE           -1
+#define DFL_CERT_REQ_CA_LIST    MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED
+#define DFL_MFL_CODE            MBEDTLS_SSL_MAX_FRAG_LEN_NONE
+#define DFL_TRUNC_HMAC          -1
+#define DFL_TICKETS             MBEDTLS_SSL_SESSION_TICKETS_ENABLED
+#define DFL_TICKET_TIMEOUT      86400
+#define DFL_CACHE_MAX           -1
+#define DFL_CACHE_TIMEOUT       -1
+#define DFL_SNI                 NULL
+#define DFL_ALPN_STRING         NULL
+#define DFL_CURVES              NULL
+#define DFL_DHM_FILE            NULL
+#define DFL_TRANSPORT           MBEDTLS_SSL_TRANSPORT_STREAM
+#define DFL_COOKIES             1
+#define DFL_ANTI_REPLAY         -1
+#define DFL_HS_TO_MIN           0
+#define DFL_HS_TO_MAX           0
+#define DFL_DTLS_MTU            -1
+#define DFL_BADMAC_LIMIT        -1
+#define DFL_DGRAM_PACKING        1
+#define DFL_EXTENDED_MS         -1
+#define DFL_ETM                 -1
+#define DFL_SERIALIZE           0
+#define DFL_CONTEXT_FILE        ""
+#define DFL_EXTENDED_MS_ENFORCE -1
+#define DFL_CA_CALLBACK         0
+#define DFL_EAP_TLS             0
+#define DFL_REPRODUCIBLE        0
+#define DFL_NSS_KEYLOG          0
+#define DFL_NSS_KEYLOG_FILE     NULL
+#define DFL_QUERY_CONFIG_MODE   0
+#define DFL_USE_SRTP            0
+#define DFL_SRTP_FORCE_PROFILE  0
+#define DFL_SRTP_SUPPORT_MKI    0
+
+#define LONG_RESPONSE "<p>01-blah-blah-blah-blah-blah-blah-blah-blah-blah\r\n" \
+    "02-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah\r\n"  \
+    "03-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah\r\n"  \
+    "04-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah\r\n"  \
+    "05-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah\r\n"  \
+    "06-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah\r\n"  \
+    "07-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah-blah</p>\r\n"
+
+/* Uncomment LONG_RESPONSE at the end of HTTP_RESPONSE to test sending longer
+ * packets (for fragmentation purposes) */
+#define HTTP_RESPONSE \
+    "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
+    "<h2>mbed TLS Test Server</h2>\r\n" \
+    "<p>Successful connection using: %s</p>\r\n" // LONG_RESPONSE
+
+/*
+ * Size of the basic I/O buffer. Able to hold our default response.
+ *
+ * You will need to adapt the mbedtls_ssl_get_bytes_avail() test in ssl-opt.sh
+ * if you change this value to something outside the range <= 100 or > 500
+ */
+#define DFL_IO_BUF_LEN      200
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#if defined(MBEDTLS_FS_IO)
+#define USAGE_IO \
+    "    ca_file=%%s          The single file containing the top-level CA(s) you fully trust\n" \
+    "                        default: \"\" (pre-loaded)\n" \
+    "                        use \"none\" to skip loading any top-level CAs.\n" \
+    "    ca_path=%%s          The path containing the top-level CA(s) you fully trust\n" \
+    "                        default: \"\" (pre-loaded) (overrides ca_file)\n" \
+    "                        use \"none\" to skip loading any top-level CAs.\n" \
+    "    crt_file=%%s         Your own cert and chain (in bottom to top order, top may be omitted)\n" \
+    "                        default: see note after key_file2\n" \
+    "    key_file=%%s         default: see note after key_file2\n" \
+    "    key_pwd=%%s          Password for key specified by key_file argument\n"\
+    "                        default: none\n" \
+    "    crt_file2=%%s        Your second cert and chain (in bottom to top order, top may be omitted)\n" \
+    "                        default: see note after key_file2\n" \
+    "    key_file2=%%s        default: see note below\n" \
+    "                        note: if neither crt_file/key_file nor crt_file2/key_file2 are used,\n" \
+    "                              preloaded certificate(s) and key(s) are used if available\n" \
+    "    key_pwd2=%%s         Password for key specified by key_file2 argument\n"\
+    "                        default: none\n" \
+    "    dhm_file=%%s        File containing Diffie-Hellman parameters\n" \
+    "                       default: preloaded parameters\n"
+#else
+#define USAGE_IO \
+    "\n"                                                    \
+    "    No file operations available (MBEDTLS_FS_IO not defined)\n" \
+    "\n"
+#endif /* MBEDTLS_FS_IO */
+#else
+#define USAGE_IO ""
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+#define USAGE_SSL_ASYNC \
+    "    async_operations=%%c...   d=decrypt, s=sign (default: -=off)\n" \
+    "    async_private_delay1=%%d  Asynchronous delay for key_file or preloaded key\n" \
+    "    async_private_delay2=%%d  Asynchronous delay for key_file2 and sni\n" \
+    "                              default: -1 (not asynchronous)\n" \
+    "    async_private_error=%%d   Async callback error injection (default=0=none,\n" \
+    "                              1=start, 2=cancel, 3=resume, negative=first time only)"
+#else
+#define USAGE_SSL_ASYNC ""
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+#define USAGE_CID \
+    "    cid=%%d             Disable (0) or enable (1) the use of the DTLS Connection ID extension.\n" \
+    "                       default: 0 (disabled)\n"     \
+    "    cid_renego=%%d      Disable (0) or enable (1) the use of the DTLS Connection ID extension during renegotiation.\n" \
+    "                       default: same as 'cid' parameter\n"     \
+    "    cid_val=%%s          The CID to use for incoming messages (in hex, without 0x).\n"  \
+    "                        default: \"\"\n" \
+    "    cid_val_renego=%%s   The CID to use for incoming messages (in hex, without 0x) after renegotiation.\n"  \
+    "                        default: same as 'cid_val' parameter\n"
+#else /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+#define USAGE_CID ""
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+#define USAGE_PSK_RAW                                               \
+    "    psk=%%s              default: \"\" (disabled)\n"     \
+    "                          The PSK values are in hex, without 0x.\n" \
+    "    psk_list=%%s         default: \"\"\n"                          \
+    "                          A list of (PSK identity, PSK value) pairs.\n" \
+    "                          The PSK values are in hex, without 0x.\n" \
+    "                          id1,psk1[,id2,psk2[,...]]\n"             \
+    "    psk_identity=%%s     default: \"Client_identity\"\n"
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+#define USAGE_PSK_SLOT                          \
+    "    psk_opaque=%%d       default: 0 (don't use opaque static PSK)\n"     \
+    "                          Enable this to store the PSK configured through command line\n" \
+    "                          parameter `psk` in a PSA-based key slot.\n" \
+    "                          Note: Currently only supported in conjunction with\n"                  \
+    "                          the use of min_version to force TLS 1.2 and force_ciphersuite \n"      \
+    "                          to force a particular PSK-only ciphersuite.\n"                         \
+    "                          Note: This is to test integration of PSA-based opaque PSKs with\n"     \
+    "                          Mbed TLS only. Production systems are likely to configure Mbed TLS\n"  \
+    "                          with prepopulated key slots instead of importing raw key material.\n" \
+    "    psk_list_opaque=%%d  default: 0 (don't use opaque dynamic PSKs)\n"     \
+    "                          Enable this to store the list of dynamically chosen PSKs configured\n" \
+    "                          through the command line parameter `psk_list` in PSA-based key slots.\n" \
+    "                          Note: Currently only supported in conjunction with\n" \
+    "                          the use of min_version to force TLS 1.2 and force_ciphersuite \n" \
+    "                          to force a particular PSK-only ciphersuite.\n" \
+    "                          Note: This is to test integration of PSA-based opaque PSKs with\n" \
+    "                          Mbed TLS only. Production systems are likely to configure Mbed TLS\n" \
+    "                          with prepopulated key slots instead of importing raw key material.\n"
+#else
+#define USAGE_PSK_SLOT ""
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+#define USAGE_PSK USAGE_PSK_RAW USAGE_PSK_SLOT
+#else
+#define USAGE_PSK ""
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+#define USAGE_CA_CALLBACK                       \
+    "   ca_callback=%%d       default: 0 (disabled)\n"      \
+    "                         Enable this to use the trusted certificate callback function\n"
+#else
+#define USAGE_CA_CALLBACK ""
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+#define USAGE_TICKETS                                       \
+    "    tickets=%%d          default: 1 (enabled)\n"       \
+    "    ticket_timeout=%%d   default: 86400 (one day)\n"
+#else
+#define USAGE_TICKETS ""
+#endif /* MBEDTLS_SSL_SESSION_TICKETS */
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+#define USAGE_EAP_TLS                                       \
+    "    eap_tls=%%d          default: 0 (disabled)\n"
+#define USAGE_NSS_KEYLOG                                    \
+    "    nss_keylog=%%d          default: 0 (disabled)\n"   \
+    "                             This cannot be used with eap_tls=1\n"
+#define USAGE_NSS_KEYLOG_FILE                               \
+    "    nss_keylog_file=%%s\n"
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+#define USAGE_SRTP \
+    "    use_srtp=%%d         default: 0 (disabled)\n" \
+    "    srtp_force_profile=%%d  default: 0 (all enabled)\n"   \
+    "                        available profiles:\n"       \
+    "                        1 - SRTP_AES128_CM_HMAC_SHA1_80\n"  \
+    "                        2 - SRTP_AES128_CM_HMAC_SHA1_32\n"  \
+    "                        3 - SRTP_NULL_HMAC_SHA1_80\n"       \
+    "                        4 - SRTP_NULL_HMAC_SHA1_32\n"       \
+    "    support_mki=%%d     default: 0 (not supported)\n"
+#else /* MBEDTLS_SSL_DTLS_SRTP */
+#define USAGE_SRTP ""
+#endif
+#else /* MBEDTLS_SSL_EXPORT_KEYS */
+#define USAGE_EAP_TLS ""
+#define USAGE_NSS_KEYLOG ""
+#define USAGE_NSS_KEYLOG_FILE ""
+#define USAGE_SRTP ""
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+#define USAGE_CACHE                                             \
+    "    cache_max=%%d        default: cache default (50)\n"    \
+    "    cache_timeout=%%d    default: cache default (1d)\n"
+#else
+#define USAGE_CACHE ""
+#endif /* MBEDTLS_SSL_CACHE_C */
+
+#if defined(SNI_OPTION)
+#if defined(MBEDTLS_X509_CRL_PARSE_C)
+#define SNI_CRL              ",crl"
+#else
+#define SNI_CRL              ""
+#endif
+
+#define USAGE_SNI                                                           \
+    "    sni=%%s              name1,cert1,key1,ca1"SNI_CRL",auth1[,...]\n"  \
+    "                        default: disabled\n"
+#else
+#define USAGE_SNI ""
+#endif /* SNI_OPTION */
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+#define USAGE_MAX_FRAG_LEN                                      \
+    "    max_frag_len=%%d     default: 16384 (tls default)\n"   \
+    "                        options: 512, 1024, 2048, 4096\n"
+#else
+#define USAGE_MAX_FRAG_LEN ""
+#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+#define USAGE_TRUNC_HMAC \
+    "    trunc_hmac=%%d       default: library default\n"
+#else
+#define USAGE_TRUNC_HMAC ""
+#endif
+
+#if defined(MBEDTLS_SSL_ALPN)
+#define USAGE_ALPN \
+    "    alpn=%%s             default: \"\" (disabled)\n"   \
+    "                        example: spdy/1,http/1.1\n"
+#else
+#define USAGE_ALPN ""
+#endif /* MBEDTLS_SSL_ALPN */
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
+#define USAGE_COOKIES \
+    "    cookies=0/1/-1      default: 1 (enabled)\n"        \
+    "                        0: disabled, -1: library default (broken)\n"
+#else
+#define USAGE_COOKIES ""
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+#define USAGE_ANTI_REPLAY \
+    "    anti_replay=0/1     default: (library default: enabled)\n"
+#else
+#define USAGE_ANTI_REPLAY ""
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
+#define USAGE_BADMAC_LIMIT \
+    "    badmac_limit=%%d     default: (library default: disabled)\n"
+#else
+#define USAGE_BADMAC_LIMIT ""
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+#define USAGE_DTLS \
+    "    dtls=%%d             default: 0 (TLS)\n"                           \
+    "    hs_timeout=%%d-%%d    default: (library default: 1000-60000)\n"    \
+    "                        range of DTLS handshake timeouts in millisecs\n" \
+    "    mtu=%%d              default: (library default: unlimited)\n"  \
+    "    dgram_packing=%%d    default: 1 (allowed)\n"                   \
+    "                        allow or forbid packing of multiple\n" \
+    "                        records within a single datgram.\n"
+#else
+#define USAGE_DTLS ""
+#endif
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+#define USAGE_EMS \
+    "    extended_ms=0/1     default: (library default: on)\n"
+#else
+#define USAGE_EMS ""
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+#define USAGE_ETM \
+    "    etm=0/1             default: (library default: on)\n"
+#else
+#define USAGE_ETM ""
+#endif
+
+#define USAGE_REPRODUCIBLE \
+    "    reproducible=0/1     default: 0 (disabled)\n"
+
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+#define USAGE_RENEGO \
+    "    renegotiation=%%d    default: 0 (disabled)\n"      \
+    "    renegotiate=%%d      default: 0 (disabled)\n"      \
+    "    renego_delay=%%d     default: -2 (library default)\n" \
+    "    renego_period=%%d    default: (2^64 - 1 for TLS, 2^48 - 1 for DTLS)\n"
+#else
+#define USAGE_RENEGO ""
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+#define USAGE_ECJPAKE \
+    "    ecjpake_pw=%%s       default: none (disabled)\n"
+#else
+#define USAGE_ECJPAKE ""
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+#define USAGE_CURVES \
+    "    curves=a,b,c,d      default: \"default\" (library default)\n"  \
+    "                        example: \"secp521r1,brainpoolP512r1\"\n"  \
+    "                        - use \"none\" for empty list\n"           \
+    "                        - see mbedtls_ecp_curve_list()\n"          \
+    "                          for acceptable curve names\n"
+#else
+#define USAGE_CURVES ""
+#endif
+
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+#define USAGE_SERIALIZATION \
+    "    serialize=%%d        default: 0 (do not serialize/deserialize)\n"     \
+    "                        options: 1 (serialize)\n"                         \
+    "                                 2 (serialize with re-initialization)\n"  \
+    "    context_file=%%s     The file path to write a serialized connection\n"\
+    "                        in the form of base64 code (serialize option\n"   \
+    "                        must be set)\n"                                   \
+    "                         default: \"\" (do nothing)\n"                    \
+    "                         option: a file path\n"
+#else
+#define USAGE_SERIALIZATION ""
+#endif
+
+/* USAGE is arbitrarily split to stay under the portable string literal
+ * length limit: 4095 bytes in C99. */
+#define USAGE1 \
+    "\n usage: ssl_server2 param=<>...\n"                   \
+    "\n acceptable parameters:\n"                           \
+    "    server_addr=%%s      default: (all interfaces)\n"  \
+    "    server_port=%%d      default: 4433\n"              \
+    "    debug_level=%%d      default: 0 (disabled)\n"      \
+    "    buffer_size=%%d      default: 200 \n" \
+    "                         (minimum: 1, max: 16385)\n" \
+    "    response_size=%%d    default: about 152 (basic response)\n" \
+    "                          (minimum: 0, max: 16384)\n" \
+    "                          increases buffer_size if bigger\n"\
+    "    nbio=%%d             default: 0 (blocking I/O)\n"  \
+    "                        options: 1 (non-blocking), 2 (added delays)\n" \
+    "    event=%%d            default: 0 (loop)\n"                            \
+    "                        options: 1 (level-triggered, implies nbio=1),\n" \
+    "    read_timeout=%%d     default: 0 ms (no timeout)\n"    \
+    "\n"                                                    \
+    USAGE_DTLS                                              \
+    USAGE_SRTP                                              \
+    USAGE_COOKIES                                           \
+    USAGE_ANTI_REPLAY                                       \
+    USAGE_BADMAC_LIMIT                                      \
+    "\n"
+#define USAGE2 \
+    "    auth_mode=%%s        default: (library default: none)\n"      \
+    "                        options: none, optional, required\n" \
+    "    cert_req_ca_list=%%d default: 1 (send ca list)\n"  \
+    "                        options: 1 (send ca list), 0 (don't send)\n" \
+    USAGE_IO                                                \
+    "\n"                                                    \
+    USAGE_PSK                                               \
+    USAGE_CA_CALLBACK                                       \
+    USAGE_ECJPAKE                                           \
+    "\n"
+#define USAGE3 \
+    "    allow_legacy=%%d     default: (library default: no)\n"      \
+    USAGE_RENEGO                                            \
+    "    exchanges=%%d        default: 1\n"                 \
+    "\n"                                                    \
+    USAGE_TICKETS                                           \
+    USAGE_EAP_TLS                                           \
+    USAGE_REPRODUCIBLE                                      \
+    USAGE_NSS_KEYLOG                                        \
+    USAGE_NSS_KEYLOG_FILE                                   \
+    USAGE_CACHE                                             \
+    USAGE_MAX_FRAG_LEN                                      \
+    USAGE_TRUNC_HMAC                                        \
+    USAGE_ALPN                                              \
+    USAGE_EMS                                               \
+    USAGE_ETM                                               \
+    USAGE_CURVES                                            \
+    "\n"
+#define USAGE4 \
+    USAGE_SSL_ASYNC                                         \
+    USAGE_SNI                                               \
+    "    arc4=%%d             default: (library default: 0)\n" \
+    "    allow_sha1=%%d       default: 0\n"                             \
+    "    min_version=%%s      default: (library default: tls1)\n"       \
+    "    max_version=%%s      default: (library default: tls1_2)\n"     \
+    "    force_version=%%s    default: \"\" (none)\n"       \
+    "                        options: ssl3, tls1, tls1_1, tls1_2, dtls1, dtls1_2\n" \
+    "\n"                                                                \
+    "    version_suites=a,b,c,d      per-version ciphersuites\n"        \
+    "                                in order from ssl3 to tls1_2\n"    \
+    "                                default: all enabled\n"            \
+    "    force_ciphersuite=<name>    default: all enabled\n"            \
+    "    query_config=<name>         return 0 if the specified\n"       \
+    "                                configuration macro is defined and 1\n"  \
+    "                                otherwise. The expansion of the macro\n" \
+    "                                is printed if it is defined\n"     \
+    USAGE_SERIALIZATION                                     \
+    " acceptable ciphersuite names:\n"
+
+#define ALPN_LIST_SIZE  10
+#define CURVE_LIST_SIZE 20
+
+#define PUT_UINT64_BE(out_be,in_le,i)                                   \
+{                                                                       \
+    (out_be)[(i) + 0] = (unsigned char)( ( (in_le) >> 56 ) & 0xFF );    \
+    (out_be)[(i) + 1] = (unsigned char)( ( (in_le) >> 48 ) & 0xFF );    \
+    (out_be)[(i) + 2] = (unsigned char)( ( (in_le) >> 40 ) & 0xFF );    \
+    (out_be)[(i) + 3] = (unsigned char)( ( (in_le) >> 32 ) & 0xFF );    \
+    (out_be)[(i) + 4] = (unsigned char)( ( (in_le) >> 24 ) & 0xFF );    \
+    (out_be)[(i) + 5] = (unsigned char)( ( (in_le) >> 16 ) & 0xFF );    \
+    (out_be)[(i) + 6] = (unsigned char)( ( (in_le) >> 8  ) & 0xFF );    \
+    (out_be)[(i) + 7] = (unsigned char)( ( (in_le) >> 0  ) & 0xFF );    \
+}
+
+
+/*
+ * global options
+ */
+struct options
+{
+    const char *server_addr;    /* address on which the ssl service runs    */
+    const char *server_port;    /* port on which the ssl service runs       */
+    int debug_level;            /* level of debugging                       */
+    int nbio;                   /* should I/O be blocking?                  */
+    int event;                  /* loop or event-driven IO? level or edge triggered? */
+    uint32_t read_timeout;      /* timeout on mbedtls_ssl_read() in milliseconds    */
+    int response_size;          /* pad response with header to requested size */
+    uint16_t buffer_size;       /* IO buffer size */
+    const char *ca_file;        /* the file with the CA certificate(s)      */
+    const char *ca_path;        /* the path with the CA certificate(s) reside */
+    const char *crt_file;       /* the file with the server certificate     */
+    const char *key_file;       /* the file with the server key             */
+    const char *key_pwd;        /* the password for the server key          */
+    const char *crt_file2;      /* the file with the 2nd server certificate */
+    const char *key_file2;      /* the file with the 2nd server key         */
+    const char *key_pwd2;       /* the password for the 2nd server key      */
+    const char *async_operations; /* supported SSL asynchronous operations  */
+    int async_private_delay1;   /* number of times f_async_resume needs to be called for key 1, or -1 for no async */
+    int async_private_delay2;   /* number of times f_async_resume needs to be called for key 2, or -1 for no async */
+    int async_private_error;    /* inject error in async private callback */
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    int psk_opaque;
+    int psk_list_opaque;
+#endif
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+    int ca_callback;            /* Use callback for trusted certificate list */
+#endif
+    const char *psk;            /* the pre-shared key                       */
+    const char *psk_identity;   /* the pre-shared key identity              */
+    char *psk_list;             /* list of PSK id/key pairs for callback    */
+    const char *ecjpake_pw;     /* the EC J-PAKE password                   */
+    int force_ciphersuite[2];   /* protocol/ciphersuite to use, or all      */
+    const char *version_suites; /* per-version ciphersuites                 */
+    int renegotiation;          /* enable / disable renegotiation           */
+    int allow_legacy;           /* allow legacy renegotiation               */
+    int renegotiate;            /* attempt renegotiation?                   */
+    int renego_delay;           /* delay before enforcing renegotiation     */
+    uint64_t renego_period;     /* period for automatic renegotiation       */
+    int exchanges;              /* number of data exchanges                 */
+    int min_version;            /* minimum protocol version accepted        */
+    int max_version;            /* maximum protocol version accepted        */
+    int arc4;                   /* flag for arc4 suites support             */
+    int allow_sha1;             /* flag for SHA-1 support                   */
+    int auth_mode;              /* verify mode for connection               */
+    int cert_req_ca_list;       /* should we send the CA list?              */
+    unsigned char mfl_code;     /* code for maximum fragment length         */
+    int trunc_hmac;             /* accept truncated hmac?                   */
+    int tickets;                /* enable / disable session tickets         */
+    int ticket_timeout;         /* session ticket lifetime                  */
+    int cache_max;              /* max number of session cache entries      */
+    int cache_timeout;          /* expiration delay of session cache entries */
+    char *sni;                  /* string describing sni information        */
+    const char *curves;         /* list of supported elliptic curves        */
+    const char *alpn_string;    /* ALPN supported protocols                 */
+    const char *dhm_file;       /* the file with the DH parameters          */
+    int extended_ms;            /* allow negotiation of extended MS?        */
+    int etm;                    /* allow negotiation of encrypt-then-MAC?   */
+    int transport;              /* TLS or DTLS?                             */
+    int cookies;                /* Use cookies for DTLS? -1 to break them   */
+    int anti_replay;            /* Use anti-replay for DTLS? -1 for default */
+    uint32_t hs_to_min;         /* Initial value of DTLS handshake timer    */
+    uint32_t hs_to_max;         /* Max value of DTLS handshake timer        */
+    int dtls_mtu;               /* UDP Maximum tranport unit for DTLS       */
+    int dgram_packing;          /* allow/forbid datagram packing            */
+    int badmac_limit;           /* Limit of records with bad MAC            */
+    int eap_tls;                /* derive EAP-TLS keying material?          */
+    int nss_keylog;             /* export NSS key log material              */
+    const char *nss_keylog_file; /* NSS key log file                        */
+    int cid_enabled;            /* whether to use the CID extension or not  */
+    int cid_enabled_renego;     /* whether to use the CID extension or not
+                                 * during renegotiation                     */
+    const char *cid_val;        /* the CID to use for incoming messages     */
+    int serialize;              /* serialize/deserialize connection         */
+    const char *context_file;   /* the file to write a serialized connection
+                                 * in the form of base64 code (serialize
+                                 * option must be set)                      */
+    const char *cid_val_renego; /* the CID to use for incoming messages
+                                 * after renegotiation                      */
+    int reproducible;           /* make communication reproducible          */
+    int query_config_mode;      /* whether to read config                   */
+    int use_srtp;               /* Support SRTP                             */
+    int force_srtp_profile;     /* SRTP protection profile to use or all    */
+    int support_mki;            /* The dtls mki mki support                 */
+} opt;
+
+#include "ssl_test_common_source.c"
+
+/*
+ * Return authmode from string, or -1 on error
+ */
+static int get_auth_mode( const char *s )
+{
+    if( strcmp( s, "none" ) == 0 )
+        return( MBEDTLS_SSL_VERIFY_NONE );
+    if( strcmp( s, "optional" ) == 0 )
+        return( MBEDTLS_SSL_VERIFY_OPTIONAL );
+    if( strcmp( s, "required" ) == 0 )
+        return( MBEDTLS_SSL_VERIFY_REQUIRED );
+
+    return( -1 );
+}
+
+/*
+ * Used by sni_parse and psk_parse to handle coma-separated lists
+ */
+#define GET_ITEM( dst )         \
+    do                          \
+    {                           \
+        (dst) = p;              \
+        while( *p != ',' )      \
+            if( ++p > end )     \
+                goto error;     \
+        *p++ = '\0';            \
+    } while( 0 )
+
+#if defined(SNI_OPTION)
+typedef struct _sni_entry sni_entry;
+
+struct _sni_entry {
+    const char *name;
+    mbedtls_x509_crt *cert;
+    mbedtls_pk_context *key;
+    mbedtls_x509_crt* ca;
+    mbedtls_x509_crl* crl;
+    int authmode;
+    sni_entry *next;
+};
+
+void sni_free( sni_entry *head )
+{
+    sni_entry *cur = head, *next;
+
+    while( cur != NULL )
+    {
+        mbedtls_x509_crt_free( cur->cert );
+        mbedtls_free( cur->cert );
+
+        mbedtls_pk_free( cur->key );
+        mbedtls_free( cur->key );
+
+        mbedtls_x509_crt_free( cur->ca );
+        mbedtls_free( cur->ca );
+#if defined(MBEDTLS_X509_CRL_PARSE_C)
+        mbedtls_x509_crl_free( cur->crl );
+        mbedtls_free( cur->crl );
+#endif
+        next = cur->next;
+        mbedtls_free( cur );
+        cur = next;
+    }
+}
+
+/*
+ * Parse a string of sextuples name1,crt1,key1,ca1,crl1,auth1[,...]
+ * into a usable sni_entry list. For ca1, crl1, auth1, the special value
+ * '-' means unset. If ca1 is unset, then crl1 is ignored too.
+ *
+ * Modifies the input string! This is not production quality!
+ */
+sni_entry *sni_parse( char *sni_string )
+{
+    sni_entry *cur = NULL, *new = NULL;
+    char *p = sni_string;
+    char *end = p;
+    char *crt_file, *key_file, *ca_file, *auth_str;
+#if defined(MBEDTLS_X509_CRL_PARSE_C)
+    char *crl_file;
+#endif
+
+    while( *end != '\0' )
+        ++end;
+    *end = ',';
+
+    while( p <= end )
+    {
+        if( ( new = mbedtls_calloc( 1, sizeof( sni_entry ) ) ) == NULL )
+        {
+            sni_free( cur );
+            return( NULL );
+        }
+
+        GET_ITEM( new->name );
+        GET_ITEM( crt_file );
+        GET_ITEM( key_file );
+        GET_ITEM( ca_file );
+#if defined(MBEDTLS_X509_CRL_PARSE_C)
+        GET_ITEM( crl_file );
+#endif
+        GET_ITEM( auth_str );
+
+        if( ( new->cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ) ) == NULL ||
+            ( new->key = mbedtls_calloc( 1, sizeof( mbedtls_pk_context ) ) ) == NULL )
+            goto error;
+
+        mbedtls_x509_crt_init( new->cert );
+        mbedtls_pk_init( new->key );
+
+        if( mbedtls_x509_crt_parse_file( new->cert, crt_file ) != 0 ||
+            mbedtls_pk_parse_keyfile( new->key, key_file, "" ) != 0 )
+            goto error;
+
+        if( strcmp( ca_file, "-" ) != 0 )
+        {
+            if( ( new->ca = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ) ) == NULL )
+                goto error;
+
+            mbedtls_x509_crt_init( new->ca );
+
+            if( mbedtls_x509_crt_parse_file( new->ca, ca_file ) != 0 )
+                goto error;
+        }
+
+#if defined(MBEDTLS_X509_CRL_PARSE_C)
+        if( strcmp( crl_file, "-" ) != 0 )
+        {
+            if( ( new->crl = mbedtls_calloc( 1, sizeof( mbedtls_x509_crl ) ) ) == NULL )
+                goto error;
+
+            mbedtls_x509_crl_init( new->crl );
+
+            if( mbedtls_x509_crl_parse_file( new->crl, crl_file ) != 0 )
+                goto error;
+        }
+#endif
+
+        if( strcmp( auth_str, "-" ) != 0 )
+        {
+            if( ( new->authmode = get_auth_mode( auth_str ) ) < 0 )
+                goto error;
+        }
+        else
+            new->authmode = DFL_AUTH_MODE;
+
+        new->next = cur;
+        cur = new;
+    }
+
+    return( cur );
+
+error:
+    sni_free( new );
+    sni_free( cur );
+    return( NULL );
+}
+
+/*
+ * SNI callback.
+ */
+int sni_callback( void *p_info, mbedtls_ssl_context *ssl,
+                  const unsigned char *name, size_t name_len )
+{
+    const sni_entry *cur = (const sni_entry *) p_info;
+
+    while( cur != NULL )
+    {
+        if( name_len == strlen( cur->name ) &&
+            memcmp( name, cur->name, name_len ) == 0 )
+        {
+            if( cur->ca != NULL )
+                mbedtls_ssl_set_hs_ca_chain( ssl, cur->ca, cur->crl );
+
+            if( cur->authmode != DFL_AUTH_MODE )
+                mbedtls_ssl_set_hs_authmode( ssl, cur->authmode );
+
+            return( mbedtls_ssl_set_hs_own_cert( ssl, cur->cert, cur->key ) );
+        }
+
+        cur = cur->next;
+    }
+
+    return( -1 );
+}
+
+#endif /* SNI_OPTION */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+
+typedef struct _psk_entry psk_entry;
+
+struct _psk_entry
+{
+    const char *name;
+    size_t key_len;
+    unsigned char key[MBEDTLS_PSK_MAX_LEN];
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_key_id_t slot;
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+    psk_entry *next;
+};
+
+/*
+ * Free a list of psk_entry's
+ */
+int psk_free( psk_entry *head )
+{
+    psk_entry *next;
+
+    while( head != NULL )
+    {
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+        psa_status_t status;
+        psa_key_id_t const slot = head->slot;
+
+        if( slot != 0 )
+        {
+            status = psa_destroy_key( slot );
+            if( status != PSA_SUCCESS )
+                return( status );
+        }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+        next = head->next;
+        mbedtls_free( head );
+        head = next;
+    }
+
+    return( 0 );
+}
+
+/*
+ * Parse a string of pairs name1,key1[,name2,key2[,...]]
+ * into a usable psk_entry list.
+ *
+ * Modifies the input string! This is not production quality!
+ */
+psk_entry *psk_parse( char *psk_string )
+{
+    psk_entry *cur = NULL, *new = NULL;
+    char *p = psk_string;
+    char *end = p;
+    char *key_hex;
+
+    while( *end != '\0' )
+        ++end;
+    *end = ',';
+
+    while( p <= end )
+    {
+        if( ( new = mbedtls_calloc( 1, sizeof( psk_entry ) ) ) == NULL )
+            goto error;
+
+        memset( new, 0, sizeof( psk_entry ) );
+
+        GET_ITEM( new->name );
+        GET_ITEM( key_hex );
+
+        if( mbedtls_test_unhexify( new->key, MBEDTLS_PSK_MAX_LEN,
+                                   key_hex, &new->key_len ) != 0 )
+            goto error;
+
+        new->next = cur;
+        cur = new;
+    }
+
+    return( cur );
+
+error:
+    psk_free( new );
+    psk_free( cur );
+    return( 0 );
+}
+
+/*
+ * PSK callback
+ */
+int psk_callback( void *p_info, mbedtls_ssl_context *ssl,
+                  const unsigned char *name, size_t name_len )
+{
+    psk_entry *cur = (psk_entry *) p_info;
+
+    while( cur != NULL )
+    {
+        if( name_len == strlen( cur->name ) &&
+            memcmp( name, cur->name, name_len ) == 0 )
+        {
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+            if( cur->slot != 0 )
+                return( mbedtls_ssl_set_hs_psk_opaque( ssl, cur->slot ) );
+            else
+#endif
+            return( mbedtls_ssl_set_hs_psk( ssl, cur->key, cur->key_len ) );
+        }
+
+        cur = cur->next;
+    }
+
+    return( -1 );
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
+
+static mbedtls_net_context listen_fd, client_fd;
+
+/* Interruption handler to ensure clean exit (for valgrind testing) */
+#if !defined(_WIN32)
+static int received_sigterm = 0;
+void term_handler( int sig )
+{
+    ((void) sig);
+    received_sigterm = 1;
+    mbedtls_net_free( &listen_fd ); /* causes mbedtls_net_accept() to abort */
+    mbedtls_net_free( &client_fd ); /* causes net_read() to abort */
+}
+#endif
+
+/** Return true if \p ret is a status code indicating that there is an
+ * operation in progress on an SSL connection, and false if it indicates
+ * success or a fatal error.
+ *
+ * The possible operations in progress are:
+ *
+ * - A read, when the SSL input buffer does not contain a full message.
+ * - A write, when the SSL output buffer contains some data that has not
+ *   been sent over the network yet.
+ * - An asynchronous callback that has not completed yet. */
+static int mbedtls_status_is_ssl_in_progress( int ret )
+{
+    return( ret == MBEDTLS_ERR_SSL_WANT_READ ||
+            ret == MBEDTLS_ERR_SSL_WANT_WRITE ||
+            ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS );
+}
+
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+typedef struct
+{
+    mbedtls_x509_crt *cert; /*!< Certificate corresponding to the key */
+    mbedtls_pk_context *pk; /*!< Private key */
+    unsigned delay; /*!< Number of resume steps to go through */
+    unsigned pk_owned : 1; /*!< Whether to free the pk object on exit */
+} ssl_async_key_slot_t;
+
+typedef enum {
+    SSL_ASYNC_INJECT_ERROR_NONE = 0, /*!< Let the callbacks succeed */
+    SSL_ASYNC_INJECT_ERROR_START, /*!< Inject error during start */
+    SSL_ASYNC_INJECT_ERROR_CANCEL, /*!< Close the connection after async start */
+    SSL_ASYNC_INJECT_ERROR_RESUME, /*!< Inject error during resume */
+#define SSL_ASYNC_INJECT_ERROR_MAX SSL_ASYNC_INJECT_ERROR_RESUME
+} ssl_async_inject_error_t;
+
+typedef struct
+{
+    ssl_async_key_slot_t slots[4]; /* key, key2, sni1, sni2 */
+    size_t slots_used;
+    ssl_async_inject_error_t inject_error;
+    int (*f_rng)(void *, unsigned char *, size_t);
+    void *p_rng;
+} ssl_async_key_context_t;
+
+int ssl_async_set_key( ssl_async_key_context_t *ctx,
+                       mbedtls_x509_crt *cert,
+                       mbedtls_pk_context *pk,
+                       int pk_take_ownership,
+                       unsigned delay )
+{
+    if( ctx->slots_used >= sizeof( ctx->slots ) / sizeof( *ctx->slots ) )
+        return( -1 );
+    ctx->slots[ctx->slots_used].cert = cert;
+    ctx->slots[ctx->slots_used].pk = pk;
+    ctx->slots[ctx->slots_used].delay = delay;
+    ctx->slots[ctx->slots_used].pk_owned = pk_take_ownership;
+    ++ctx->slots_used;
+    return( 0 );
+}
+
+#define SSL_ASYNC_INPUT_MAX_SIZE 512
+
+typedef enum
+{
+    ASYNC_OP_SIGN,
+    ASYNC_OP_DECRYPT,
+} ssl_async_operation_type_t;
+/* Note that the enum above and the array below need to be kept in sync!
+ * `ssl_async_operation_names[op]` is the name of op for each value `op`
+ * of type `ssl_async_operation_type_t`. */
+static const char *const ssl_async_operation_names[] =
+{
+    "sign",
+    "decrypt",
+};
+
+typedef struct
+{
+    unsigned slot;
+    ssl_async_operation_type_t operation_type;
+    mbedtls_md_type_t md_alg;
+    unsigned char input[SSL_ASYNC_INPUT_MAX_SIZE];
+    size_t input_len;
+    unsigned remaining_delay;
+} ssl_async_operation_context_t;
+
+static int ssl_async_start( mbedtls_ssl_context *ssl,
+                            mbedtls_x509_crt *cert,
+                            ssl_async_operation_type_t op_type,
+                            mbedtls_md_type_t md_alg,
+                            const unsigned char *input,
+                            size_t input_len )
+{
+    ssl_async_key_context_t *config_data =
+        mbedtls_ssl_conf_get_async_config_data( ssl->conf );
+    unsigned slot;
+    ssl_async_operation_context_t *ctx = NULL;
+    const char *op_name = ssl_async_operation_names[op_type];
+
+    {
+        char dn[100];
+        if( mbedtls_x509_dn_gets( dn, sizeof( dn ), &cert->subject ) > 0 )
+            mbedtls_printf( "Async %s callback: looking for DN=%s\n",
+                            op_name, dn );
+    }
+
+    /* Look for a private key that matches the public key in cert.
+     * Since this test code has the private key inside Mbed TLS,
+     * we call mbedtls_pk_check_pair to match a private key with the
+     * public key. */
+    for( slot = 0; slot < config_data->slots_used; slot++ )
+    {
+        if( mbedtls_pk_check_pair( &cert->pk,
+                                   config_data->slots[slot].pk ) == 0 )
+            break;
+    }
+    if( slot == config_data->slots_used )
+    {
+        mbedtls_printf( "Async %s callback: no key matches this certificate.\n",
+                        op_name );
+        return( MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH );
+    }
+    mbedtls_printf( "Async %s callback: using key slot %u, delay=%u.\n",
+                    op_name, slot, config_data->slots[slot].delay );
+
+    if( config_data->inject_error == SSL_ASYNC_INJECT_ERROR_START )
+    {
+        mbedtls_printf( "Async %s callback: injected error\n", op_name );
+        return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
+    }
+
+    if( input_len > SSL_ASYNC_INPUT_MAX_SIZE )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+    ctx = mbedtls_calloc( 1, sizeof( *ctx ) );
+    if( ctx == NULL )
+        return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+    ctx->slot = slot;
+    ctx->operation_type = op_type;
+    ctx->md_alg = md_alg;
+    memcpy( ctx->input, input, input_len );
+    ctx->input_len = input_len;
+    ctx->remaining_delay = config_data->slots[slot].delay;
+    mbedtls_ssl_set_async_operation_data( ssl, ctx );
+
+    if( ctx->remaining_delay == 0 )
+        return( 0 );
+    else
+        return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS );
+}
+
+static int ssl_async_sign( mbedtls_ssl_context *ssl,
+                           mbedtls_x509_crt *cert,
+                           mbedtls_md_type_t md_alg,
+                           const unsigned char *hash,
+                           size_t hash_len )
+{
+    return( ssl_async_start( ssl, cert,
+                             ASYNC_OP_SIGN, md_alg,
+                             hash, hash_len ) );
+}
+
+static int ssl_async_decrypt( mbedtls_ssl_context *ssl,
+                              mbedtls_x509_crt *cert,
+                              const unsigned char *input,
+                              size_t input_len )
+{
+    return( ssl_async_start( ssl, cert,
+                             ASYNC_OP_DECRYPT, MBEDTLS_MD_NONE,
+                             input, input_len ) );
+}
+
+static int ssl_async_resume( mbedtls_ssl_context *ssl,
+                             unsigned char *output,
+                             size_t *output_len,
+                             size_t output_size )
+{
+    ssl_async_operation_context_t *ctx = mbedtls_ssl_get_async_operation_data( ssl );
+    ssl_async_key_context_t *config_data =
+        mbedtls_ssl_conf_get_async_config_data( ssl->conf );
+    ssl_async_key_slot_t *key_slot = &config_data->slots[ctx->slot];
+    int ret;
+    const char *op_name;
+
+    if( ctx->remaining_delay > 0 )
+    {
+        --ctx->remaining_delay;
+        mbedtls_printf( "Async resume (slot %u): call %u more times.\n",
+                        ctx->slot, ctx->remaining_delay );
+        return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS );
+    }
+
+    switch( ctx->operation_type )
+    {
+        case ASYNC_OP_DECRYPT:
+            ret = mbedtls_pk_decrypt( key_slot->pk,
+                                      ctx->input, ctx->input_len,
+                                      output, output_len, output_size,
+                                      config_data->f_rng, config_data->p_rng );
+            break;
+        case ASYNC_OP_SIGN:
+            ret = mbedtls_pk_sign( key_slot->pk,
+                                   ctx->md_alg,
+                                   ctx->input, ctx->input_len,
+                                   output, output_len,
+                                   config_data->f_rng, config_data->p_rng );
+            break;
+        default:
+            mbedtls_printf( "Async resume (slot %u): unknown operation type %ld. This shouldn't happen.\n",
+                            ctx->slot, (long) ctx->operation_type );
+            mbedtls_free( ctx );
+            return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
+            break;
+    }
+
+    op_name = ssl_async_operation_names[ctx->operation_type];
+
+    if( config_data->inject_error == SSL_ASYNC_INJECT_ERROR_RESUME )
+    {
+        mbedtls_printf( "Async resume callback: %s done but injected error\n",
+                        op_name );
+        mbedtls_free( ctx );
+        return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
+    }
+
+    mbedtls_printf( "Async resume (slot %u): %s done, status=%d.\n",
+                    ctx->slot, op_name, ret );
+    mbedtls_free( ctx );
+    return( ret );
+}
+
+static void ssl_async_cancel( mbedtls_ssl_context *ssl )
+{
+    ssl_async_operation_context_t *ctx = mbedtls_ssl_get_async_operation_data( ssl );
+    mbedtls_printf( "Async cancel callback.\n" );
+    mbedtls_free( ctx );
+}
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+static psa_status_t psa_setup_psk_key_slot( psa_key_id_t *slot,
+                                            psa_algorithm_t alg,
+                                            unsigned char *psk,
+                                            size_t psk_len )
+{
+    psa_status_t status;
+    psa_key_attributes_t key_attributes;
+
+    key_attributes = psa_key_attributes_init();
+    psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
+    psa_set_key_algorithm( &key_attributes, alg );
+    psa_set_key_type( &key_attributes, PSA_KEY_TYPE_DERIVE );
+
+    status = psa_import_key( &key_attributes, psk, psk_len, slot );
+    if( status != PSA_SUCCESS )
+    {
+        fprintf( stderr, "IMPORT\n" );
+        return( status );
+    }
+
+    return( PSA_SUCCESS );
+}
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+int report_cid_usage( mbedtls_ssl_context *ssl,
+                      const char *additional_description )
+{
+    int ret;
+    unsigned char peer_cid[ MBEDTLS_SSL_CID_OUT_LEN_MAX ];
+    size_t peer_cid_len;
+    int cid_negotiated;
+
+    if( opt.transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+        return( 0 );
+
+    /* Check if the use of a CID has been negotiated */
+    ret = mbedtls_ssl_get_peer_cid( ssl, &cid_negotiated,
+                                    peer_cid, &peer_cid_len );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_get_peer_cid returned -0x%x\n\n",
+                        (unsigned int) -ret );
+        return( ret );
+    }
+
+    if( cid_negotiated == MBEDTLS_SSL_CID_DISABLED )
+    {
+        if( opt.cid_enabled == MBEDTLS_SSL_CID_ENABLED )
+        {
+            mbedtls_printf( "(%s) Use of Connection ID was not offered by client.\n",
+                            additional_description );
+        }
+    }
+    else
+    {
+        size_t idx=0;
+        mbedtls_printf( "(%s) Use of Connection ID has been negotiated.\n",
+                        additional_description );
+        mbedtls_printf( "(%s) Peer CID (length %u Bytes): ",
+                        additional_description,
+                        (unsigned) peer_cid_len );
+        while( idx < peer_cid_len )
+        {
+            mbedtls_printf( "%02x ", peer_cid[ idx ] );
+            idx++;
+        }
+        mbedtls_printf( "\n" );
+    }
+
+    return( 0 );
+}
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+int main( int argc, char *argv[] )
+{
+    int ret = 0, len, written, frags, exchanges_left;
+    int query_config_ret = 0;
+    int version_suites[4][2];
+    io_ctx_t io_ctx;
+    unsigned char* buf = 0;
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_algorithm_t alg = 0;
+    psa_key_id_t psk_slot = 0;
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+    unsigned char psk[MBEDTLS_PSK_MAX_LEN];
+    size_t psk_len = 0;
+    psk_entry *psk_info = NULL;
+#endif
+    const char *pers = "ssl_server2";
+    unsigned char client_ip[16] = { 0 };
+    size_t cliip_len;
+#if defined(MBEDTLS_SSL_COOKIE_C)
+    mbedtls_ssl_cookie_ctx cookie_ctx;
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    mbedtls_x509_crt_profile crt_profile_for_test = mbedtls_x509_crt_profile_default;
+#endif
+    rng_context_t rng;
+    mbedtls_ssl_context ssl;
+    mbedtls_ssl_config conf;
+#if defined(MBEDTLS_TIMING_C)
+    mbedtls_timing_delay_context timer;
+#endif
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+    unsigned char renego_period[8] = { 0 };
+#endif
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    uint32_t flags;
+    mbedtls_x509_crt cacert;
+    mbedtls_x509_crt srvcert;
+    mbedtls_pk_context pkey;
+    mbedtls_x509_crt srvcert2;
+    mbedtls_pk_context pkey2;
+    int key_cert_init = 0, key_cert_init2 = 0;
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+    ssl_async_key_context_t ssl_async_keys;
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_FS_IO)
+    mbedtls_dhm_context dhm;
+#endif
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_context cache;
+#endif
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+    mbedtls_ssl_ticket_context ticket_ctx;
+#endif
+#if defined(SNI_OPTION)
+    sni_entry *sni_info = NULL;
+#endif
+#if defined(MBEDTLS_ECP_C)
+    mbedtls_ecp_group_id curve_list[CURVE_LIST_SIZE];
+    const mbedtls_ecp_curve_info * curve_cur;
+#endif
+#if defined(MBEDTLS_SSL_ALPN)
+    const char *alpn_list[ALPN_LIST_SIZE];
+#endif
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+    unsigned char alloc_buf[MEMORY_HEAP_SIZE];
+#endif
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    unsigned char cid[MBEDTLS_SSL_CID_IN_LEN_MAX];
+    unsigned char cid_renego[MBEDTLS_SSL_CID_IN_LEN_MAX];
+    size_t cid_len = 0;
+    size_t cid_renego_len = 0;
+#endif
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+    unsigned char *context_buf = NULL;
+    size_t context_buf_len = 0;
+#endif
+
+    int i;
+    char *p, *q;
+    const int *list;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_status_t status;
+#endif
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+    unsigned char eap_tls_keymaterial[16];
+    unsigned char eap_tls_iv[8];
+    const char* eap_tls_label = "client EAP encryption";
+    eap_tls_keys eap_tls_keying;
+#if defined( MBEDTLS_SSL_DTLS_SRTP )
+    /*! master keys and master salt for SRTP generated during handshake */
+     unsigned char dtls_srtp_key_material[MBEDTLS_TLS_SRTP_MAX_KEY_MATERIAL_LENGTH];
+     const char* dtls_srtp_label = "EXTRACTOR-dtls_srtp";
+     dtls_srtp_keys dtls_srtp_keying;
+     const mbedtls_ssl_srtp_profile default_profiles[] = {
+         MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80,
+         MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32,
+         MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80,
+         MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32,
+         MBEDTLS_TLS_SRTP_UNSET
+     };
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+    mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
+#if defined(MBEDTLS_MEMORY_DEBUG)
+    size_t current_heap_memory, peak_heap_memory, heap_blocks;
+#endif  /* MBEDTLS_MEMORY_DEBUG */
+#endif  /* MBEDTLS_MEMORY_BUFFER_ALLOC_C */
+
+#if defined(MBEDTLS_TEST_HOOKS)
+    test_hooks_init( );
+#endif /* MBEDTLS_TEST_HOOKS */
+
+    /*
+     * Make sure memory references are valid in case we exit early.
+     */
+    mbedtls_net_init( &client_fd );
+    mbedtls_net_init( &listen_fd );
+    mbedtls_ssl_init( &ssl );
+    mbedtls_ssl_config_init( &conf );
+    rng_init( &rng );
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    mbedtls_x509_crt_init( &cacert );
+    mbedtls_x509_crt_init( &srvcert );
+    mbedtls_pk_init( &pkey );
+    mbedtls_x509_crt_init( &srvcert2 );
+    mbedtls_pk_init( &pkey2 );
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+    memset( &ssl_async_keys, 0, sizeof( ssl_async_keys ) );
+#endif
+#endif
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_FS_IO)
+    mbedtls_dhm_init( &dhm );
+#endif
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_init( &cache );
+#endif
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+    mbedtls_ssl_ticket_init( &ticket_ctx );
+#endif
+#if defined(MBEDTLS_SSL_ALPN)
+    memset( (void *) alpn_list, 0, sizeof( alpn_list ) );
+#endif
+#if defined(MBEDTLS_SSL_COOKIE_C)
+    mbedtls_ssl_cookie_init( &cookie_ctx );
+#endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    status = psa_crypto_init();
+    if( status != PSA_SUCCESS )
+    {
+        mbedtls_fprintf( stderr, "Failed to initialize PSA Crypto implementation: %d\n",
+                         (int) status );
+        ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
+        goto exit;
+    }
+#endif  /* MBEDTLS_USE_PSA_CRYPTO */
+#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
+    mbedtls_test_enable_insecure_external_rng( );
+#endif  /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
+
+#if !defined(_WIN32)
+    /* Abort cleanly on SIGTERM and SIGINT */
+    signal( SIGTERM, term_handler );
+    signal( SIGINT, term_handler );
+#endif
+
+    if( argc == 0 )
+    {
+    usage:
+        if( ret == 0 )
+            ret = 1;
+
+        mbedtls_printf( USAGE1 );
+        mbedtls_printf( USAGE2 );
+        mbedtls_printf( USAGE3 );
+        mbedtls_printf( USAGE4 );
+
+        list = mbedtls_ssl_list_ciphersuites();
+        while( *list )
+        {
+            mbedtls_printf(" %-42s", mbedtls_ssl_get_ciphersuite_name( *list ) );
+            list++;
+            if( !*list )
+                break;
+            mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name( *list ) );
+            list++;
+        }
+        mbedtls_printf("\n");
+        goto exit;
+    }
+
+    opt.buffer_size         = DFL_IO_BUF_LEN;
+    opt.server_addr         = DFL_SERVER_ADDR;
+    opt.server_port         = DFL_SERVER_PORT;
+    opt.debug_level         = DFL_DEBUG_LEVEL;
+    opt.event               = DFL_EVENT;
+    opt.response_size       = DFL_RESPONSE_SIZE;
+    opt.nbio                = DFL_NBIO;
+    opt.cid_enabled         = DFL_CID_ENABLED;
+    opt.cid_enabled_renego  = DFL_CID_ENABLED_RENEGO;
+    opt.cid_val             = DFL_CID_VALUE;
+    opt.cid_val_renego      = DFL_CID_VALUE_RENEGO;
+    opt.read_timeout        = DFL_READ_TIMEOUT;
+    opt.ca_file             = DFL_CA_FILE;
+    opt.ca_path             = DFL_CA_PATH;
+    opt.crt_file            = DFL_CRT_FILE;
+    opt.key_file            = DFL_KEY_FILE;
+    opt.key_pwd             = DFL_KEY_PWD;
+    opt.crt_file2           = DFL_CRT_FILE2;
+    opt.key_file2           = DFL_KEY_FILE2;
+    opt.key_pwd2            = DFL_KEY_PWD2;
+    opt.async_operations    = DFL_ASYNC_OPERATIONS;
+    opt.async_private_delay1 = DFL_ASYNC_PRIVATE_DELAY1;
+    opt.async_private_delay2 = DFL_ASYNC_PRIVATE_DELAY2;
+    opt.async_private_error = DFL_ASYNC_PRIVATE_ERROR;
+    opt.psk                 = DFL_PSK;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    opt.psk_opaque          = DFL_PSK_OPAQUE;
+    opt.psk_list_opaque     = DFL_PSK_LIST_OPAQUE;
+#endif
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+    opt.ca_callback         = DFL_CA_CALLBACK;
+#endif
+    opt.psk_identity        = DFL_PSK_IDENTITY;
+    opt.psk_list            = DFL_PSK_LIST;
+    opt.ecjpake_pw          = DFL_ECJPAKE_PW;
+    opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
+    opt.version_suites      = DFL_VERSION_SUITES;
+    opt.renegotiation       = DFL_RENEGOTIATION;
+    opt.allow_legacy        = DFL_ALLOW_LEGACY;
+    opt.renegotiate         = DFL_RENEGOTIATE;
+    opt.renego_delay        = DFL_RENEGO_DELAY;
+    opt.renego_period       = DFL_RENEGO_PERIOD;
+    opt.exchanges           = DFL_EXCHANGES;
+    opt.min_version         = DFL_MIN_VERSION;
+    opt.max_version         = DFL_MAX_VERSION;
+    opt.arc4                = DFL_ARC4;
+    opt.allow_sha1          = DFL_SHA1;
+    opt.auth_mode           = DFL_AUTH_MODE;
+    opt.cert_req_ca_list    = DFL_CERT_REQ_CA_LIST;
+    opt.mfl_code            = DFL_MFL_CODE;
+    opt.trunc_hmac          = DFL_TRUNC_HMAC;
+    opt.tickets             = DFL_TICKETS;
+    opt.ticket_timeout      = DFL_TICKET_TIMEOUT;
+    opt.cache_max           = DFL_CACHE_MAX;
+    opt.cache_timeout       = DFL_CACHE_TIMEOUT;
+    opt.sni                 = DFL_SNI;
+    opt.alpn_string         = DFL_ALPN_STRING;
+    opt.curves              = DFL_CURVES;
+    opt.dhm_file            = DFL_DHM_FILE;
+    opt.transport           = DFL_TRANSPORT;
+    opt.cookies             = DFL_COOKIES;
+    opt.anti_replay         = DFL_ANTI_REPLAY;
+    opt.hs_to_min           = DFL_HS_TO_MIN;
+    opt.hs_to_max           = DFL_HS_TO_MAX;
+    opt.dtls_mtu            = DFL_DTLS_MTU;
+    opt.dgram_packing       = DFL_DGRAM_PACKING;
+    opt.badmac_limit        = DFL_BADMAC_LIMIT;
+    opt.extended_ms         = DFL_EXTENDED_MS;
+    opt.etm                 = DFL_ETM;
+    opt.serialize           = DFL_SERIALIZE;
+    opt.context_file        = DFL_CONTEXT_FILE;
+    opt.eap_tls             = DFL_EAP_TLS;
+    opt.reproducible        = DFL_REPRODUCIBLE;
+    opt.nss_keylog          = DFL_NSS_KEYLOG;
+    opt.nss_keylog_file     = DFL_NSS_KEYLOG_FILE;
+    opt.query_config_mode   = DFL_QUERY_CONFIG_MODE;
+    opt.use_srtp            = DFL_USE_SRTP;
+    opt.force_srtp_profile  = DFL_SRTP_FORCE_PROFILE;
+    opt.support_mki         = DFL_SRTP_SUPPORT_MKI;
+
+    for( i = 1; i < argc; i++ )
+    {
+        p = argv[i];
+        if( ( q = strchr( p, '=' ) ) == NULL )
+            goto usage;
+        *q++ = '\0';
+
+        if( strcmp( p, "server_port" ) == 0 )
+            opt.server_port = q;
+        else if( strcmp( p, "server_addr" ) == 0 )
+            opt.server_addr = q;
+        else if( strcmp( p, "dtls" ) == 0 )
+        {
+            int t = atoi( q );
+            if( t == 0 )
+                opt.transport = MBEDTLS_SSL_TRANSPORT_STREAM;
+            else if( t == 1 )
+                opt.transport = MBEDTLS_SSL_TRANSPORT_DATAGRAM;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "debug_level" ) == 0 )
+        {
+            opt.debug_level = atoi( q );
+            if( opt.debug_level < 0 || opt.debug_level > 65535 )
+                goto usage;
+        }
+        else if( strcmp( p, "nbio" ) == 0 )
+        {
+            opt.nbio = atoi( q );
+            if( opt.nbio < 0 || opt.nbio > 2 )
+                goto usage;
+        }
+        else if( strcmp( p, "event" ) == 0 )
+        {
+            opt.event = atoi( q );
+            if( opt.event < 0 || opt.event > 2 )
+                goto usage;
+        }
+        else if( strcmp( p, "read_timeout" ) == 0 )
+            opt.read_timeout = atoi( q );
+        else if( strcmp( p, "buffer_size" ) == 0 )
+        {
+            opt.buffer_size = atoi( q );
+            if( opt.buffer_size < 1 || opt.buffer_size > MBEDTLS_SSL_MAX_CONTENT_LEN + 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "response_size" ) == 0 )
+        {
+            opt.response_size = atoi( q );
+            if( opt.response_size < 0 || opt.response_size > MBEDTLS_SSL_MAX_CONTENT_LEN )
+                goto usage;
+            if( opt.buffer_size < opt.response_size )
+                opt.buffer_size = opt.response_size;
+        }
+        else if( strcmp( p, "ca_file" ) == 0 )
+            opt.ca_file = q;
+        else if( strcmp( p, "ca_path" ) == 0 )
+            opt.ca_path = q;
+        else if( strcmp( p, "crt_file" ) == 0 )
+            opt.crt_file = q;
+        else if( strcmp( p, "key_file" ) == 0 )
+            opt.key_file = q;
+        else if( strcmp( p, "key_pwd" ) == 0 )
+            opt.key_pwd = q;
+        else if( strcmp( p, "crt_file2" ) == 0 )
+            opt.crt_file2 = q;
+        else if( strcmp( p, "key_file2" ) == 0 )
+            opt.key_file2 = q;
+        else if( strcmp( p, "key_pwd2" ) == 0 )
+            opt.key_pwd2 = q;
+        else if( strcmp( p, "dhm_file" ) == 0 )
+            opt.dhm_file = q;
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+        else if( strcmp( p, "async_operations" ) == 0 )
+            opt.async_operations = q;
+        else if( strcmp( p, "async_private_delay1" ) == 0 )
+            opt.async_private_delay1 = atoi( q );
+        else if( strcmp( p, "async_private_delay2" ) == 0 )
+            opt.async_private_delay2 = atoi( q );
+        else if( strcmp( p, "async_private_error" ) == 0 )
+        {
+            int n = atoi( q );
+            if( n < -SSL_ASYNC_INJECT_ERROR_MAX ||
+                n > SSL_ASYNC_INJECT_ERROR_MAX )
+            {
+                ret = 2;
+                goto usage;
+            }
+            opt.async_private_error = n;
+        }
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+        else if( strcmp( p, "cid" ) == 0 )
+        {
+            opt.cid_enabled = atoi( q );
+            if( opt.cid_enabled != 0 && opt.cid_enabled != 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "cid_renego" ) == 0 )
+        {
+            opt.cid_enabled_renego = atoi( q );
+            if( opt.cid_enabled_renego != 0 && opt.cid_enabled_renego != 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "cid_val" ) == 0 )
+        {
+            opt.cid_val = q;
+        }
+        else if( strcmp( p, "cid_val_renego" ) == 0 )
+        {
+            opt.cid_val_renego = q;
+        }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+        else if( strcmp( p, "psk" ) == 0 )
+            opt.psk = q;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+        else if( strcmp( p, "psk_opaque" ) == 0 )
+            opt.psk_opaque = atoi( q );
+        else if( strcmp( p, "psk_list_opaque" ) == 0 )
+            opt.psk_list_opaque = atoi( q );
+#endif
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+        else if( strcmp( p, "ca_callback" ) == 0)
+            opt.ca_callback = atoi( q );
+#endif
+        else if( strcmp( p, "psk_identity" ) == 0 )
+            opt.psk_identity = q;
+        else if( strcmp( p, "psk_list" ) == 0 )
+            opt.psk_list = q;
+        else if( strcmp( p, "ecjpake_pw" ) == 0 )
+            opt.ecjpake_pw = q;
+        else if( strcmp( p, "force_ciphersuite" ) == 0 )
+        {
+            opt.force_ciphersuite[0] = mbedtls_ssl_get_ciphersuite_id( q );
+
+            if( opt.force_ciphersuite[0] == 0 )
+            {
+                ret = 2;
+                goto usage;
+            }
+            opt.force_ciphersuite[1] = 0;
+        }
+        else if( strcmp( p, "curves" ) == 0 )
+            opt.curves = q;
+        else if( strcmp( p, "version_suites" ) == 0 )
+            opt.version_suites = q;
+        else if( strcmp( p, "renegotiation" ) == 0 )
+        {
+            opt.renegotiation = (atoi( q )) ?
+                MBEDTLS_SSL_RENEGOTIATION_ENABLED :
+                MBEDTLS_SSL_RENEGOTIATION_DISABLED;
+        }
+        else if( strcmp( p, "allow_legacy" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case -1:
+                    opt.allow_legacy = MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE;
+                    break;
+                case 0:
+                    opt.allow_legacy = MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION;
+                    break;
+                case 1:
+                    opt.allow_legacy = MBEDTLS_SSL_LEGACY_ALLOW_RENEGOTIATION;
+                    break;
+                default: goto usage;
+            }
+        }
+        else if( strcmp( p, "renegotiate" ) == 0 )
+        {
+            opt.renegotiate = atoi( q );
+            if( opt.renegotiate < 0 || opt.renegotiate > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "renego_delay" ) == 0 )
+        {
+            opt.renego_delay = atoi( q );
+        }
+        else if( strcmp( p, "renego_period" ) == 0 )
+        {
+#if defined(_MSC_VER)
+            opt.renego_period = _strtoui64( q, NULL, 10 );
+#else
+            if( sscanf( q, "%" SCNu64, &opt.renego_period ) != 1 )
+                goto usage;
+#endif /* _MSC_VER */
+            if( opt.renego_period < 2 )
+                goto usage;
+        }
+        else if( strcmp( p, "exchanges" ) == 0 )
+        {
+            opt.exchanges = atoi( q );
+            if( opt.exchanges < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "min_version" ) == 0 )
+        {
+            if( strcmp( q, "ssl3" ) == 0 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_0;
+            else if( strcmp( q, "tls1" ) == 0 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_1;
+            else if( strcmp( q, "tls1_1" ) == 0 ||
+                     strcmp( q, "dtls1" ) == 0 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
+            else if( strcmp( q, "tls1_2" ) == 0 ||
+                     strcmp( q, "dtls1_2" ) == 0 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_3;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "max_version" ) == 0 )
+        {
+            if( strcmp( q, "ssl3" ) == 0 )
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_0;
+            else if( strcmp( q, "tls1" ) == 0 )
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_1;
+            else if( strcmp( q, "tls1_1" ) == 0 ||
+                     strcmp( q, "dtls1" ) == 0 )
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_2;
+            else if( strcmp( q, "tls1_2" ) == 0 ||
+                     strcmp( q, "dtls1_2" ) == 0 )
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_3;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "arc4" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0:     opt.arc4 = MBEDTLS_SSL_ARC4_DISABLED;   break;
+                case 1:     opt.arc4 = MBEDTLS_SSL_ARC4_ENABLED;    break;
+                default:    goto usage;
+            }
+        }
+        else if( strcmp( p, "allow_sha1" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0:     opt.allow_sha1 = 0;   break;
+                case 1:     opt.allow_sha1 = 1;    break;
+                default:    goto usage;
+            }
+        }
+        else if( strcmp( p, "force_version" ) == 0 )
+        {
+            if( strcmp( q, "ssl3" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_0;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_0;
+            }
+            else if( strcmp( q, "tls1" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_1;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_1;
+            }
+            else if( strcmp( q, "tls1_1" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_2;
+            }
+            else if( strcmp( q, "tls1_2" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_3;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_3;
+            }
+            else if( strcmp( q, "dtls1" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_2;
+                opt.transport = MBEDTLS_SSL_TRANSPORT_DATAGRAM;
+            }
+            else if( strcmp( q, "dtls1_2" ) == 0 )
+            {
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_3;
+                opt.max_version = MBEDTLS_SSL_MINOR_VERSION_3;
+                opt.transport = MBEDTLS_SSL_TRANSPORT_DATAGRAM;
+            }
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "auth_mode" ) == 0 )
+        {
+            if( ( opt.auth_mode = get_auth_mode( q ) ) < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "cert_req_ca_list" ) == 0 )
+        {
+            opt.cert_req_ca_list = atoi( q );
+            if( opt.cert_req_ca_list < 0 || opt.cert_req_ca_list > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "max_frag_len" ) == 0 )
+        {
+            if( strcmp( q, "512" ) == 0 )
+                opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_512;
+            else if( strcmp( q, "1024" ) == 0 )
+                opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_1024;
+            else if( strcmp( q, "2048" ) == 0 )
+                opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_2048;
+            else if( strcmp( q, "4096" ) == 0 )
+                opt.mfl_code = MBEDTLS_SSL_MAX_FRAG_LEN_4096;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "alpn" ) == 0 )
+        {
+            opt.alpn_string = q;
+        }
+        else if( strcmp( p, "trunc_hmac" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0: opt.trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_DISABLED; break;
+                case 1: opt.trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED; break;
+                default: goto usage;
+            }
+        }
+        else if( strcmp( p, "extended_ms" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0:
+                    opt.extended_ms = MBEDTLS_SSL_EXTENDED_MS_DISABLED;
+                    break;
+                case 1:
+                    opt.extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
+                    break;
+                default: goto usage;
+            }
+        }
+        else if( strcmp( p, "etm" ) == 0 )
+        {
+            switch( atoi( q ) )
+            {
+                case 0: opt.etm = MBEDTLS_SSL_ETM_DISABLED; break;
+                case 1: opt.etm = MBEDTLS_SSL_ETM_ENABLED; break;
+                default: goto usage;
+            }
+        }
+        else if( strcmp( p, "tickets" ) == 0 )
+        {
+            opt.tickets = atoi( q );
+            if( opt.tickets < 0 || opt.tickets > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "ticket_timeout" ) == 0 )
+        {
+            opt.ticket_timeout = atoi( q );
+            if( opt.ticket_timeout < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "cache_max" ) == 0 )
+        {
+            opt.cache_max = atoi( q );
+            if( opt.cache_max < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "cache_timeout" ) == 0 )
+        {
+            opt.cache_timeout = atoi( q );
+            if( opt.cache_timeout < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "cookies" ) == 0 )
+        {
+            opt.cookies = atoi( q );
+            if( opt.cookies < -1 || opt.cookies > 1)
+                goto usage;
+        }
+        else if( strcmp( p, "anti_replay" ) == 0 )
+        {
+            opt.anti_replay = atoi( q );
+            if( opt.anti_replay < 0 || opt.anti_replay > 1)
+                goto usage;
+        }
+        else if( strcmp( p, "badmac_limit" ) == 0 )
+        {
+            opt.badmac_limit = atoi( q );
+            if( opt.badmac_limit < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "hs_timeout" ) == 0 )
+        {
+            if( ( p = strchr( q, '-' ) ) == NULL )
+                goto usage;
+            *p++ = '\0';
+            opt.hs_to_min = atoi( q );
+            opt.hs_to_max = atoi( p );
+            if( opt.hs_to_min == 0 || opt.hs_to_max < opt.hs_to_min )
+                goto usage;
+        }
+        else if( strcmp( p, "mtu" ) == 0 )
+        {
+            opt.dtls_mtu = atoi( q );
+            if( opt.dtls_mtu < 0 )
+                goto usage;
+        }
+        else if( strcmp( p, "dgram_packing" ) == 0 )
+        {
+            opt.dgram_packing = atoi( q );
+            if( opt.dgram_packing != 0 &&
+                opt.dgram_packing != 1 )
+            {
+                goto usage;
+            }
+        }
+        else if( strcmp( p, "sni" ) == 0 )
+        {
+            opt.sni = q;
+        }
+        else if( strcmp( p, "query_config" ) == 0 )
+        {
+            opt.query_config_mode = 1;
+            query_config_ret = query_config( q );
+            goto exit;
+        }
+        else if( strcmp( p, "serialize") == 0 )
+        {
+            opt.serialize = atoi( q );
+            if( opt.serialize < 0 || opt.serialize > 2)
+                goto usage;
+        }
+        else if( strcmp( p, "context_file") == 0 )
+        {
+            opt.context_file = q;
+        }
+        else if( strcmp( p, "eap_tls" ) == 0 )
+        {
+            opt.eap_tls = atoi( q );
+            if( opt.eap_tls < 0 || opt.eap_tls > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "reproducible" ) == 0 )
+        {
+            opt.reproducible = 1;
+        }
+        else if( strcmp( p, "nss_keylog" ) == 0 )
+        {
+            opt.nss_keylog = atoi( q );
+            if( opt.nss_keylog < 0 || opt.nss_keylog > 1 )
+                goto usage;
+        }
+        else if( strcmp( p, "nss_keylog_file" ) == 0 )
+        {
+            opt.nss_keylog_file = q;
+        }
+        else if( strcmp( p, "use_srtp" ) == 0 )
+        {
+            opt.use_srtp = atoi ( q );
+        }
+        else if( strcmp( p, "srtp_force_profile" ) == 0 )
+        {
+            opt.force_srtp_profile = atoi( q );
+        }
+        else if( strcmp( p, "support_mki" ) == 0 )
+        {
+            opt.support_mki = atoi( q );
+        }
+        else
+            goto usage;
+    }
+
+    if( opt.nss_keylog != 0 && opt.eap_tls != 0 )
+    {
+        mbedtls_printf( "Error: eap_tls and nss_keylog options cannot be used together.\n" );
+        goto usage;
+    }
+
+    /* Event-driven IO is incompatible with the above custom
+     * receive and send functions, as the polling builds on
+     * refers to the underlying net_context. */
+    if( opt.event == 1 && opt.nbio != 1 )
+    {
+        mbedtls_printf( "Warning: event-driven IO mandates nbio=1 - overwrite\n" );
+        opt.nbio = 1;
+    }
+
+#if defined(MBEDTLS_DEBUG_C)
+    mbedtls_debug_set_threshold( opt.debug_level );
+#endif
+    buf = mbedtls_calloc( 1, opt.buffer_size + 1 );
+    if( buf == NULL )
+    {
+        mbedtls_printf( "Could not allocate %u bytes\n", opt.buffer_size );
+        ret = 3;
+        goto exit;
+    }
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if( opt.psk_opaque != 0 )
+    {
+        if( strlen( opt.psk ) == 0 )
+        {
+            mbedtls_printf( "psk_opaque set but no psk to be imported specified.\n" );
+            ret = 2;
+            goto usage;
+        }
+
+        if( opt.force_ciphersuite[0] <= 0 )
+        {
+            mbedtls_printf( "opaque PSKs are only supported in conjunction with forcing TLS 1.2 and a PSK-only ciphersuite through the 'force_ciphersuite' option.\n" );
+            ret = 2;
+            goto usage;
+        }
+    }
+
+    if( opt.psk_list_opaque != 0 )
+    {
+        if( opt.psk_list == NULL )
+        {
+            mbedtls_printf( "psk_slot set but no psk to be imported specified.\n" );
+            ret = 2;
+            goto usage;
+        }
+
+        if( opt.force_ciphersuite[0] <= 0 )
+        {
+            mbedtls_printf( "opaque PSKs are only supported in conjunction with forcing TLS 1.2 and a PSK-only ciphersuite through the 'force_ciphersuite' option.\n" );
+            ret = 2;
+            goto usage;
+        }
+    }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+    if( opt.force_ciphersuite[0] > 0 )
+    {
+        const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
+        ciphersuite_info =
+            mbedtls_ssl_ciphersuite_from_id( opt.force_ciphersuite[0] );
+
+        if( opt.max_version != -1 &&
+            ciphersuite_info->min_minor_ver > opt.max_version )
+        {
+            mbedtls_printf( "forced ciphersuite not allowed with this protocol version\n" );
+            ret = 2;
+            goto usage;
+        }
+        if( opt.min_version != -1 &&
+            ciphersuite_info->max_minor_ver < opt.min_version )
+        {
+            mbedtls_printf( "forced ciphersuite not allowed with this protocol version\n" );
+            ret = 2;
+            goto usage;
+        }
+
+        /* If we select a version that's not supported by
+         * this suite, then there will be no common ciphersuite... */
+        if( opt.max_version == -1 ||
+            opt.max_version > ciphersuite_info->max_minor_ver )
+        {
+            opt.max_version = ciphersuite_info->max_minor_ver;
+        }
+        if( opt.min_version < ciphersuite_info->min_minor_ver )
+        {
+            opt.min_version = ciphersuite_info->min_minor_ver;
+            /* DTLS starts with TLS 1.1 */
+            if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
+                opt.min_version < MBEDTLS_SSL_MINOR_VERSION_2 )
+                opt.min_version = MBEDTLS_SSL_MINOR_VERSION_2;
+        }
+
+        /* Enable RC4 if needed and not explicitly disabled */
+        if( ciphersuite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
+        {
+            if( opt.arc4 == MBEDTLS_SSL_ARC4_DISABLED )
+            {
+                mbedtls_printf("forced RC4 ciphersuite with RC4 disabled\n");
+                ret = 2;
+                goto usage;
+            }
+
+            opt.arc4 = MBEDTLS_SSL_ARC4_ENABLED;
+        }
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+        if( opt.psk_opaque != 0 || opt.psk_list_opaque != 0 )
+        {
+            /* Ensure that the chosen ciphersuite is PSK-only; we must know
+             * the ciphersuite in advance to set the correct policy for the
+             * PSK key slot. This limitation might go away in the future. */
+            if( ciphersuite_info->key_exchange != MBEDTLS_KEY_EXCHANGE_PSK ||
+                opt.min_version != MBEDTLS_SSL_MINOR_VERSION_3 )
+            {
+                mbedtls_printf( "opaque PSKs are only supported in conjunction with forcing TLS 1.2 and a PSK-only ciphersuite through the 'force_ciphersuite' option.\n" );
+                ret = 2;
+                goto usage;
+            }
+
+            /* Determine KDF algorithm the opaque PSK will be used in. */
+#if defined(MBEDTLS_SHA512_C)
+            if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
+                alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384);
+            else
+#endif /* MBEDTLS_SHA512_C */
+                alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256);
+        }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+    }
+
+    if( opt.version_suites != NULL )
+    {
+        const char *name[4] = { 0 };
+
+        /* Parse 4-element coma-separated list */
+        for( i = 0, p = (char *) opt.version_suites;
+             i < 4 && *p != '\0';
+             i++ )
+        {
+            name[i] = p;
+
+            /* Terminate the current string and move on to next one */
+            while( *p != ',' && *p != '\0' )
+                p++;
+            if( *p == ',' )
+                *p++ = '\0';
+        }
+
+        if( i != 4 )
+        {
+            mbedtls_printf( "too few values for version_suites\n" );
+            ret = 1;
+            goto exit;
+        }
+
+        memset( version_suites, 0, sizeof( version_suites ) );
+
+        /* Get the suites identifiers from their name */
+        for( i = 0; i < 4; i++ )
+        {
+            version_suites[i][0] = mbedtls_ssl_get_ciphersuite_id( name[i] );
+
+            if( version_suites[i][0] == 0 )
+            {
+                mbedtls_printf( "unknown ciphersuite: '%s'\n", name[i] );
+                ret = 2;
+                goto usage;
+            }
+        }
+    }
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    if( mbedtls_test_unhexify( cid, sizeof( cid ),
+                               opt.cid_val, &cid_len ) != 0 )
+    {
+        mbedtls_printf( "CID not valid hex\n" );
+        goto exit;
+    }
+
+    /* Keep CID settings for renegotiation unless
+     * specified otherwise. */
+    if( opt.cid_enabled_renego == DFL_CID_ENABLED_RENEGO )
+        opt.cid_enabled_renego = opt.cid_enabled;
+    if( opt.cid_val_renego == DFL_CID_VALUE_RENEGO )
+        opt.cid_val_renego = opt.cid_val;
+
+    if( mbedtls_test_unhexify( cid_renego, sizeof( cid_renego ),
+                               opt.cid_val_renego, &cid_renego_len ) != 0 )
+    {
+        mbedtls_printf( "CID not valid hex\n" );
+        goto exit;
+    }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+    /*
+     * Unhexify the pre-shared key and parse the list if any given
+     */
+    if( mbedtls_test_unhexify( psk, sizeof( psk ),
+                               opt.psk, &psk_len ) != 0 )
+    {
+        mbedtls_printf( "pre-shared key not valid hex\n" );
+        goto exit;
+    }
+
+    if( opt.psk_list != NULL )
+    {
+        if( ( psk_info = psk_parse( opt.psk_list ) ) == NULL )
+        {
+            mbedtls_printf( "psk_list invalid" );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
+
+#if defined(MBEDTLS_ECP_C)
+    if( opt.curves != NULL )
+    {
+        p = (char *) opt.curves;
+        i = 0;
+
+        if( strcmp( p, "none" ) == 0 )
+        {
+            curve_list[0] = MBEDTLS_ECP_DP_NONE;
+        }
+        else if( strcmp( p, "default" ) != 0 )
+        {
+            /* Leave room for a final NULL in curve list */
+            while( i < CURVE_LIST_SIZE - 1 && *p != '\0' )
+            {
+                q = p;
+
+                /* Terminate the current string */
+                while( *p != ',' && *p != '\0' )
+                    p++;
+                if( *p == ',' )
+                    *p++ = '\0';
+
+                if( ( curve_cur = mbedtls_ecp_curve_info_from_name( q ) ) != NULL )
+                {
+                    curve_list[i++] = curve_cur->grp_id;
+                }
+                else
+                {
+                    mbedtls_printf( "unknown curve %s\n", q );
+                    mbedtls_printf( "supported curves: " );
+                    for( curve_cur = mbedtls_ecp_curve_list();
+                         curve_cur->grp_id != MBEDTLS_ECP_DP_NONE;
+                         curve_cur++ )
+                    {
+                        mbedtls_printf( "%s ", curve_cur->name );
+                    }
+                    mbedtls_printf( "\n" );
+                    goto exit;
+                }
+            }
+
+            mbedtls_printf("Number of curves: %d\n", i );
+
+            if( i == CURVE_LIST_SIZE - 1 && *p != '\0' )
+            {
+                mbedtls_printf( "curves list too long, maximum %d",
+                                CURVE_LIST_SIZE - 1  );
+                goto exit;
+            }
+
+            curve_list[i] = MBEDTLS_ECP_DP_NONE;
+        }
+    }
+#endif /* MBEDTLS_ECP_C */
+
+#if defined(MBEDTLS_SSL_ALPN)
+    if( opt.alpn_string != NULL )
+    {
+        p = (char *) opt.alpn_string;
+        i = 0;
+
+        /* Leave room for a final NULL in alpn_list */
+        while( i < ALPN_LIST_SIZE - 1 && *p != '\0' )
+        {
+            alpn_list[i++] = p;
+
+            /* Terminate the current string and move on to next one */
+            while( *p != ',' && *p != '\0' )
+                p++;
+            if( *p == ',' )
+                *p++ = '\0';
+        }
+    }
+#endif /* MBEDTLS_SSL_ALPN */
+
+    /*
+     * 0. Initialize the RNG and the session data
+     */
+    mbedtls_printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    ret = rng_seed( &rng, opt.reproducible, pers );
+    if( ret != 0 )
+        goto exit;
+    mbedtls_printf( " ok\n" );
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    /*
+     * 1.1. Load the trusted CA
+     */
+    mbedtls_printf( "  . Loading the CA root certificate ..." );
+    fflush( stdout );
+
+    if( strcmp( opt.ca_path, "none" ) == 0 ||
+        strcmp( opt.ca_file, "none" ) == 0 )
+    {
+        ret = 0;
+    }
+    else
+#if defined(MBEDTLS_FS_IO)
+    if( strlen( opt.ca_path ) )
+        ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path );
+    else if( strlen( opt.ca_file ) )
+        ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file );
+    else
+#endif
+#if defined(MBEDTLS_CERTS_C)
+    {
+#if defined(MBEDTLS_PEM_PARSE_C)
+        for( i = 0; mbedtls_test_cas[i] != NULL; i++ )
+        {
+            ret = mbedtls_x509_crt_parse( &cacert,
+                                  (const unsigned char *) mbedtls_test_cas[i],
+                                  mbedtls_test_cas_len[i] );
+            if( ret != 0 )
+                break;
+        }
+        if( ret == 0 )
+#endif /* MBEDTLS_PEM_PARSE_C */
+        for( i = 0; mbedtls_test_cas_der[i] != NULL; i++ )
+        {
+            ret = mbedtls_x509_crt_parse_der( &cacert,
+                         (const unsigned char *) mbedtls_test_cas_der[i],
+                         mbedtls_test_cas_der_len[i] );
+            if( ret != 0 )
+                break;
+        }
+    }
+#else
+    {
+        ret = 1;
+        mbedtls_printf( "MBEDTLS_CERTS_C not defined." );
+    }
+#endif /* MBEDTLS_CERTS_C */
+    if( ret < 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok (%d skipped)\n", ret );
+
+    /*
+     * 1.2. Load own certificate and private key
+     */
+    mbedtls_printf( "  . Loading the server cert. and key..." );
+    fflush( stdout );
+
+#if defined(MBEDTLS_FS_IO)
+    if( strlen( opt.crt_file ) && strcmp( opt.crt_file, "none" ) != 0 )
+    {
+        key_cert_init++;
+        if( ( ret = mbedtls_x509_crt_parse_file( &srvcert, opt.crt_file ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse_file returned -0x%x\n\n",
+                    (unsigned int) -ret );
+            goto exit;
+        }
+    }
+    if( strlen( opt.key_file ) && strcmp( opt.key_file, "none" ) != 0 )
+    {
+        key_cert_init++;
+        if( ( ret = mbedtls_pk_parse_keyfile( &pkey, opt.key_file,
+                                              opt.key_pwd ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_pk_parse_keyfile returned -0x%x\n\n", (unsigned int) -ret );
+            goto exit;
+        }
+    }
+    if( key_cert_init == 1 )
+    {
+        mbedtls_printf( " failed\n  !  crt_file without key_file or vice-versa\n\n" );
+        goto exit;
+    }
+
+    if( strlen( opt.crt_file2 ) && strcmp( opt.crt_file2, "none" ) != 0 )
+    {
+        key_cert_init2++;
+        if( ( ret = mbedtls_x509_crt_parse_file( &srvcert2, opt.crt_file2 ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse_file(2) returned -0x%x\n\n",
+                    (unsigned int) -ret );
+            goto exit;
+        }
+    }
+    if( strlen( opt.key_file2 ) && strcmp( opt.key_file2, "none" ) != 0 )
+    {
+        key_cert_init2++;
+        if( ( ret = mbedtls_pk_parse_keyfile( &pkey2, opt.key_file2,
+                                              opt.key_pwd2 ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_pk_parse_keyfile(2) returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+    }
+    if( key_cert_init2 == 1 )
+    {
+        mbedtls_printf( " failed\n  !  crt_file2 without key_file2 or vice-versa\n\n" );
+        goto exit;
+    }
+#endif
+    if( key_cert_init == 0 &&
+        strcmp( opt.crt_file, "none" ) != 0 &&
+        strcmp( opt.key_file, "none" ) != 0 &&
+        key_cert_init2 == 0 &&
+        strcmp( opt.crt_file2, "none" ) != 0 &&
+        strcmp( opt.key_file2, "none" ) != 0 )
+    {
+#if !defined(MBEDTLS_CERTS_C)
+        mbedtls_printf( "Not certificated or key provided, and \nMBEDTLS_CERTS_C not defined!\n" );
+        goto exit;
+#else
+#if defined(MBEDTLS_RSA_C)
+        if( ( ret = mbedtls_x509_crt_parse( &srvcert,
+                                    (const unsigned char *) mbedtls_test_srv_crt_rsa,
+                                    mbedtls_test_srv_crt_rsa_len ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+        if( ( ret = mbedtls_pk_parse_key( &pkey,
+                                  (const unsigned char *) mbedtls_test_srv_key_rsa,
+                                  mbedtls_test_srv_key_rsa_len, NULL, 0 ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_pk_parse_key returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+        key_cert_init = 2;
+#endif /* MBEDTLS_RSA_C */
+#if defined(MBEDTLS_ECDSA_C)
+        if( ( ret = mbedtls_x509_crt_parse( &srvcert2,
+                                    (const unsigned char *) mbedtls_test_srv_crt_ec,
+                                    mbedtls_test_srv_crt_ec_len ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  !  x509_crt_parse2 returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+        if( ( ret = mbedtls_pk_parse_key( &pkey2,
+                                  (const unsigned char *) mbedtls_test_srv_key_ec,
+                                  mbedtls_test_srv_key_ec_len, NULL, 0 ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  !  pk_parse_key2 returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+        key_cert_init2 = 2;
+#endif /* MBEDTLS_ECDSA_C */
+#endif /* MBEDTLS_CERTS_C */
+    }
+
+    mbedtls_printf( " ok\n" );
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_FS_IO)
+    if( opt.dhm_file != NULL )
+    {
+        mbedtls_printf( "  . Loading DHM parameters..." );
+        fflush( stdout );
+
+        if( ( ret = mbedtls_dhm_parse_dhmfile( &dhm, opt.dhm_file ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_dhm_parse_dhmfile returned -0x%04X\n\n",
+                     (unsigned int) -ret );
+            goto exit;
+        }
+
+        mbedtls_printf( " ok\n" );
+    }
+#endif
+
+#if defined(SNI_OPTION)
+    if( opt.sni != NULL )
+    {
+        mbedtls_printf( "  . Setting up SNI information..." );
+        fflush( stdout );
+
+        if( ( sni_info = sni_parse( opt.sni ) ) == NULL )
+        {
+            mbedtls_printf( " failed\n" );
+            goto exit;
+        }
+
+        mbedtls_printf( " ok\n" );
+    }
+#endif /* SNI_OPTION */
+
+    /*
+     * 2. Setup the listening TCP socket
+     */
+    mbedtls_printf( "  . Bind on %s://%s:%s/ ...",
+            opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM ? "tcp" : "udp",
+            opt.server_addr ? opt.server_addr : "*",
+            opt.server_port );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_bind( &listen_fd, opt.server_addr, opt.server_port,
+                          opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM ?
+                          MBEDTLS_NET_PROTO_TCP : MBEDTLS_NET_PROTO_UDP ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_bind returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 3. Setup stuff
+     */
+    mbedtls_printf( "  . Setting up the SSL/TLS structure..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ssl_config_defaults( &conf,
+                    MBEDTLS_SSL_IS_SERVER,
+                    opt.transport,
+                    MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_config_defaults returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    /* The default algorithms profile disables SHA-1, but our tests still
+       rely on it heavily. Hence we allow it here. A real-world server
+       should use the default profile unless there is a good reason not to. */
+    if( opt.allow_sha1 > 0 )
+    {
+        crt_profile_for_test.allowed_mds |= MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 );
+        mbedtls_ssl_conf_cert_profile( &conf, &crt_profile_for_test );
+        mbedtls_ssl_conf_sig_hashes( &conf, ssl_sig_hashes_for_test );
+    }
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+    if( opt.auth_mode != DFL_AUTH_MODE )
+        mbedtls_ssl_conf_authmode( &conf, opt.auth_mode );
+
+    if( opt.cert_req_ca_list != DFL_CERT_REQ_CA_LIST )
+        mbedtls_ssl_conf_cert_req_ca_list( &conf, opt.cert_req_ca_list );
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+    if( opt.hs_to_min != DFL_HS_TO_MIN || opt.hs_to_max != DFL_HS_TO_MAX )
+        mbedtls_ssl_conf_handshake_timeout( &conf, opt.hs_to_min, opt.hs_to_max );
+
+    if( opt.dgram_packing != DFL_DGRAM_PACKING )
+        mbedtls_ssl_set_datagram_packing( &ssl, opt.dgram_packing );
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+    if( ( ret = mbedtls_ssl_conf_max_frag_len( &conf, opt.mfl_code ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_max_frag_len returned %d\n\n", ret );
+        goto exit;
+    }
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    if( opt.cid_enabled == 1 || opt.cid_enabled_renego == 1 )
+    {
+        if( opt.cid_enabled == 1        &&
+            opt.cid_enabled_renego == 1 &&
+            cid_len != cid_renego_len )
+        {
+            mbedtls_printf( "CID length must not change during renegotiation\n" );
+            goto usage;
+        }
+
+        if( opt.cid_enabled == 1 )
+            ret = mbedtls_ssl_conf_cid( &conf, cid_len,
+                                        MBEDTLS_SSL_UNEXPECTED_CID_IGNORE );
+        else
+            ret = mbedtls_ssl_conf_cid( &conf, cid_renego_len,
+                                        MBEDTLS_SSL_UNEXPECTED_CID_IGNORE );
+
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_cid_len returned -%#04x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+    const mbedtls_ssl_srtp_profile forced_profile[] = { opt.force_srtp_profile, MBEDTLS_TLS_SRTP_UNSET };
+    if( opt.use_srtp == 1 )
+    {
+        if( opt.force_srtp_profile != 0 )
+        {
+            ret = mbedtls_ssl_conf_dtls_srtp_protection_profiles( &conf, forced_profile );
+        }
+        else
+        {
+            ret = mbedtls_ssl_conf_dtls_srtp_protection_profiles( &conf, default_profiles );
+        }
+
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_dtls_srtp_protection_profiles returned %d\n\n", ret );
+            goto exit;
+        }
+
+        mbedtls_ssl_conf_srtp_mki_value_supported( &conf,
+                                                   opt.support_mki ?
+                                                   MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED :
+                                                   MBEDTLS_SSL_DTLS_SRTP_MKI_UNSUPPORTED );
+
+    }
+    else if( opt.force_srtp_profile != 0 )
+    {
+        mbedtls_printf( " failed\n  ! must enable use_srtp to force srtp profile\n\n" );
+        goto exit;
+    }
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+
+#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
+    if( opt.trunc_hmac != DFL_TRUNC_HMAC )
+        mbedtls_ssl_conf_truncated_hmac( &conf, opt.trunc_hmac );
+#endif
+
+#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
+    if( opt.extended_ms != DFL_EXTENDED_MS )
+        mbedtls_ssl_conf_extended_master_secret( &conf, opt.extended_ms );
+#endif
+
+#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+    if( opt.etm != DFL_ETM )
+        mbedtls_ssl_conf_encrypt_then_mac( &conf, opt.etm );
+#endif
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+    if( opt.eap_tls != 0 )
+    {
+        mbedtls_ssl_conf_export_keys_ext_cb( &conf, eap_tls_key_derivation,
+                                             &eap_tls_keying );
+    }
+    else if( opt.nss_keylog != 0 )
+    {
+        mbedtls_ssl_conf_export_keys_ext_cb( &conf,
+                                             nss_keylog_export,
+                                             NULL );
+    }
+#if defined( MBEDTLS_SSL_DTLS_SRTP )
+    else if( opt.use_srtp != 0 )
+    {
+        mbedtls_ssl_conf_export_keys_ext_cb( &conf, dtls_srtp_key_derivation,
+                                             &dtls_srtp_keying );
+    }
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+#if defined(MBEDTLS_SSL_ALPN)
+    if( opt.alpn_string != NULL )
+        if( ( ret = mbedtls_ssl_conf_alpn_protocols( &conf, alpn_list ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_alpn_protocols returned %d\n\n", ret );
+            goto exit;
+        }
+#endif
+
+    if (opt.reproducible)
+    {
+#if defined(MBEDTLS_HAVE_TIME)
+#if defined(MBEDTLS_PLATFORM_TIME_ALT)
+        mbedtls_platform_set_time( dummy_constant_time );
+#else
+        fprintf( stderr, "Warning: reproducible option used without constant time\n" );
+#endif
+#endif  /* MBEDTLS_HAVE_TIME */
+    }
+    mbedtls_ssl_conf_rng( &conf, rng_get, &rng );
+    mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+    if( opt.cache_max != -1 )
+        mbedtls_ssl_cache_set_max_entries( &cache, opt.cache_max );
+
+    if( opt.cache_timeout != -1 )
+        mbedtls_ssl_cache_set_timeout( &cache, opt.cache_timeout );
+
+    mbedtls_ssl_conf_session_cache( &conf, &cache,
+                                   mbedtls_ssl_cache_get,
+                                   mbedtls_ssl_cache_set );
+#endif
+
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+    if( opt.tickets == MBEDTLS_SSL_SESSION_TICKETS_ENABLED )
+    {
+        if( ( ret = mbedtls_ssl_ticket_setup( &ticket_ctx,
+                        rng_get, &rng,
+                        MBEDTLS_CIPHER_AES_256_GCM,
+                        opt.ticket_timeout ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_ticket_setup returned %d\n\n", ret );
+            goto exit;
+        }
+
+        mbedtls_ssl_conf_session_tickets_cb( &conf,
+                mbedtls_ssl_ticket_write,
+                mbedtls_ssl_ticket_parse,
+                &ticket_ctx );
+    }
+#endif
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+    {
+#if defined(MBEDTLS_SSL_COOKIE_C)
+        if( opt.cookies > 0 )
+        {
+            if( ( ret = mbedtls_ssl_cookie_setup( &cookie_ctx,
+                                                  rng_get, &rng ) ) != 0 )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_cookie_setup returned %d\n\n", ret );
+                goto exit;
+            }
+
+            mbedtls_ssl_conf_dtls_cookies( &conf, mbedtls_ssl_cookie_write, mbedtls_ssl_cookie_check,
+                                       &cookie_ctx );
+        }
+        else
+#endif /* MBEDTLS_SSL_COOKIE_C */
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
+        if( opt.cookies == 0 )
+        {
+            mbedtls_ssl_conf_dtls_cookies( &conf, NULL, NULL, NULL );
+        }
+        else
+#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
+        {
+            ; /* Nothing to do */
+        }
+
+#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
+        if( opt.anti_replay != DFL_ANTI_REPLAY )
+            mbedtls_ssl_conf_dtls_anti_replay( &conf, opt.anti_replay );
+#endif
+
+#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
+        if( opt.badmac_limit != DFL_BADMAC_LIMIT )
+            mbedtls_ssl_conf_dtls_badmac_limit( &conf, opt.badmac_limit );
+#endif
+    }
+#endif /* MBEDTLS_SSL_PROTO_DTLS */
+
+    if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
+        mbedtls_ssl_conf_ciphersuites( &conf, opt.force_ciphersuite );
+
+#if defined(MBEDTLS_ARC4_C)
+    if( opt.arc4 != DFL_ARC4 )
+        mbedtls_ssl_conf_arc4_support( &conf, opt.arc4 );
+#endif
+
+    if( opt.version_suites != NULL )
+    {
+        mbedtls_ssl_conf_ciphersuites_for_version( &conf, version_suites[0],
+                                          MBEDTLS_SSL_MAJOR_VERSION_3,
+                                          MBEDTLS_SSL_MINOR_VERSION_0 );
+        mbedtls_ssl_conf_ciphersuites_for_version( &conf, version_suites[1],
+                                          MBEDTLS_SSL_MAJOR_VERSION_3,
+                                          MBEDTLS_SSL_MINOR_VERSION_1 );
+        mbedtls_ssl_conf_ciphersuites_for_version( &conf, version_suites[2],
+                                          MBEDTLS_SSL_MAJOR_VERSION_3,
+                                          MBEDTLS_SSL_MINOR_VERSION_2 );
+        mbedtls_ssl_conf_ciphersuites_for_version( &conf, version_suites[3],
+                                          MBEDTLS_SSL_MAJOR_VERSION_3,
+                                          MBEDTLS_SSL_MINOR_VERSION_3 );
+    }
+
+    if( opt.allow_legacy != DFL_ALLOW_LEGACY )
+        mbedtls_ssl_conf_legacy_renegotiation( &conf, opt.allow_legacy );
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+    mbedtls_ssl_conf_renegotiation( &conf, opt.renegotiation );
+
+    if( opt.renego_delay != DFL_RENEGO_DELAY )
+        mbedtls_ssl_conf_renegotiation_enforced( &conf, opt.renego_delay );
+
+    if( opt.renego_period != DFL_RENEGO_PERIOD )
+    {
+        PUT_UINT64_BE( renego_period, opt.renego_period, 0 );
+        mbedtls_ssl_conf_renegotiation_period( &conf, renego_period );
+    }
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    if( strcmp( opt.ca_path, "none" ) != 0 &&
+        strcmp( opt.ca_file, "none" ) != 0 )
+    {
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+        if( opt.ca_callback != 0 )
+            mbedtls_ssl_conf_ca_cb( &conf, ca_callback, &cacert);
+        else
+#endif
+            mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
+    }
+    if( key_cert_init )
+    {
+        mbedtls_pk_context *pk = &pkey;
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+        if( opt.async_private_delay1 >= 0 )
+        {
+            ret = ssl_async_set_key( &ssl_async_keys, &srvcert, pk, 0,
+                                     opt.async_private_delay1 );
+            if( ret < 0 )
+            {
+                mbedtls_printf( "  Test error: ssl_async_set_key failed (%d)\n",
+                                ret );
+                goto exit;
+            }
+            pk = NULL;
+        }
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+        if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, pk ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
+            goto exit;
+        }
+    }
+    if( key_cert_init2 )
+    {
+        mbedtls_pk_context *pk = &pkey2;
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+        if( opt.async_private_delay2 >= 0 )
+        {
+            ret = ssl_async_set_key( &ssl_async_keys, &srvcert2, pk, 0,
+                                     opt.async_private_delay2 );
+            if( ret < 0 )
+            {
+                mbedtls_printf( "  Test error: ssl_async_set_key failed (%d)\n",
+                                ret );
+                goto exit;
+            }
+            pk = NULL;
+        }
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+        if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert2, pk ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
+            goto exit;
+        }
+    }
+
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+    if( opt.async_operations[0] != '-' )
+    {
+        mbedtls_ssl_async_sign_t *sign = NULL;
+        mbedtls_ssl_async_decrypt_t *decrypt = NULL;
+        const char *r;
+        for( r = opt.async_operations; *r; r++ )
+        {
+            switch( *r )
+            {
+            case 'd':
+                decrypt = ssl_async_decrypt;
+                break;
+            case 's':
+                sign = ssl_async_sign;
+                break;
+            }
+        }
+        ssl_async_keys.inject_error = ( opt.async_private_error < 0 ?
+                                        - opt.async_private_error :
+                                        opt.async_private_error );
+        ssl_async_keys.f_rng = rng_get;
+        ssl_async_keys.p_rng = &rng;
+        mbedtls_ssl_conf_async_private_cb( &conf,
+                                           sign,
+                                           decrypt,
+                                           ssl_async_resume,
+                                           ssl_async_cancel,
+                                           &ssl_async_keys );
+    }
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(SNI_OPTION)
+    if( opt.sni != NULL )
+    {
+        mbedtls_ssl_conf_sni( &conf, sni_callback, sni_info );
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+        if( opt.async_private_delay2 >= 0 )
+        {
+            sni_entry *cur;
+            for( cur = sni_info; cur != NULL; cur = cur->next )
+            {
+                ret = ssl_async_set_key( &ssl_async_keys,
+                                         cur->cert, cur->key, 1,
+                                         opt.async_private_delay2 );
+                if( ret < 0 )
+                {
+                    mbedtls_printf( "  Test error: ssl_async_set_key failed (%d)\n",
+                                    ret );
+                    goto exit;
+                }
+                cur->key = NULL;
+            }
+        }
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+    }
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+    if( opt.curves != NULL &&
+        strcmp( opt.curves, "default" ) != 0 )
+    {
+        mbedtls_ssl_conf_curves( &conf, curve_list );
+    }
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+
+    if( strlen( opt.psk ) != 0 && strlen( opt.psk_identity ) != 0 )
+    {
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+        if( opt.psk_opaque != 0 )
+        {
+            /* The algorithm has already been determined earlier. */
+            status = psa_setup_psk_key_slot( &psk_slot, alg, psk, psk_len );
+            if( status != PSA_SUCCESS )
+            {
+                fprintf( stderr, "SETUP FAIL\n" );
+                ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
+                goto exit;
+            }
+            if( ( ret = mbedtls_ssl_conf_psk_opaque( &conf, psk_slot,
+                             (const unsigned char *) opt.psk_identity,
+                             strlen( opt.psk_identity ) ) ) != 0 )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_conf_psk_opaque returned %d\n\n",
+                                ret );
+                goto exit;
+            }
+        }
+        else
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+        if( psk_len > 0 )
+        {
+            ret = mbedtls_ssl_conf_psk( &conf, psk, psk_len,
+                                     (const unsigned char *) opt.psk_identity,
+                                     strlen( opt.psk_identity ) );
+            if( ret != 0 )
+            {
+                mbedtls_printf( "  failed\n  mbedtls_ssl_conf_psk returned -0x%04X\n\n", (unsigned int) -ret );
+                goto exit;
+            }
+        }
+    }
+
+    if( opt.psk_list != NULL )
+    {
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+        if( opt.psk_list_opaque != 0 )
+        {
+            psk_entry *cur_psk;
+            for( cur_psk = psk_info; cur_psk != NULL; cur_psk = cur_psk->next )
+            {
+
+                status = psa_setup_psk_key_slot( &cur_psk->slot, alg,
+                                                 cur_psk->key,
+                                                 cur_psk->key_len );
+                if( status != PSA_SUCCESS )
+                {
+                    ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
+                    goto exit;
+                }
+            }
+        }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+        mbedtls_ssl_conf_psk_cb( &conf, psk_callback, psk_info );
+    }
+#endif
+
+#if defined(MBEDTLS_DHM_C)
+    /*
+     * Use different group than default DHM group
+     */
+#if defined(MBEDTLS_FS_IO)
+    if( opt.dhm_file != NULL )
+        ret = mbedtls_ssl_conf_dh_param_ctx( &conf, &dhm );
+#endif
+    if( ret != 0 )
+    {
+        mbedtls_printf( "  failed\n  mbedtls_ssl_conf_dh_param returned -0x%04X\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+#endif
+
+    if( opt.min_version != DFL_MIN_VERSION )
+        mbedtls_ssl_conf_min_version( &conf, MBEDTLS_SSL_MAJOR_VERSION_3, opt.min_version );
+
+    if( opt.max_version != DFL_MIN_VERSION )
+        mbedtls_ssl_conf_max_version( &conf, MBEDTLS_SSL_MAJOR_VERSION_3, opt.max_version );
+
+    if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    io_ctx.ssl = &ssl;
+    io_ctx.net = &client_fd;
+    mbedtls_ssl_set_bio( &ssl, &io_ctx, send_cb, recv_cb,
+                         opt.nbio == 0 ? recv_timeout_cb : NULL );
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+    {
+        if( ( ret = mbedtls_ssl_set_cid( &ssl, opt.cid_enabled,
+                                         cid, cid_len ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_set_cid returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_SSL_PROTO_DTLS)
+    if( opt.dtls_mtu != DFL_DTLS_MTU )
+        mbedtls_ssl_set_mtu( &ssl, opt.dtls_mtu );
+#endif
+
+#if defined(MBEDTLS_TIMING_C)
+    mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
+                                            mbedtls_timing_get_delay );
+#endif
+
+    mbedtls_printf( " ok\n" );
+
+reset:
+#if !defined(_WIN32)
+    if( received_sigterm )
+    {
+        mbedtls_printf( " interrupted by SIGTERM (not in net_accept())\n" );
+        if( ret == MBEDTLS_ERR_NET_INVALID_CONTEXT )
+            ret = 0;
+
+        goto exit;
+    }
+#endif
+
+    if( ret == MBEDTLS_ERR_SSL_CLIENT_RECONNECT )
+    {
+        mbedtls_printf( "  ! Client initiated reconnection from same port\n" );
+        goto handshake;
+    }
+
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
+    }
+#endif
+
+    mbedtls_net_free( &client_fd );
+
+    mbedtls_ssl_session_reset( &ssl );
+
+    /*
+     * 3. Wait until a client connects
+     */
+    mbedtls_printf( "  . Waiting for a remote connection ..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
+                    client_ip, sizeof( client_ip ), &cliip_len ) ) != 0 )
+    {
+#if !defined(_WIN32)
+        if( received_sigterm )
+        {
+            mbedtls_printf( " interrupted by SIGTERM (in net_accept())\n" );
+            if( ret == MBEDTLS_ERR_NET_ACCEPT_FAILED )
+                ret = 0;
+
+            goto exit;
+        }
+#endif
+
+        mbedtls_printf( " failed\n  ! mbedtls_net_accept returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    if( opt.nbio > 0 )
+        ret = mbedtls_net_set_nonblock( &client_fd );
+    else
+        ret = mbedtls_net_set_block( &client_fd );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! net_set_(non)block() returned -0x%x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_ssl_conf_read_timeout( &conf, opt.read_timeout );
+
+#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+    {
+        if( ( ret = mbedtls_ssl_set_client_transport_id( &ssl,
+                        client_ip, cliip_len ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_set_client_transport_id() returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+    if( opt.ecjpake_pw != DFL_ECJPAKE_PW )
+    {
+        if( ( ret = mbedtls_ssl_set_hs_ecjpake_password( &ssl,
+                        (const unsigned char *) opt.ecjpake_pw,
+                                        strlen( opt.ecjpake_pw ) ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hs_ecjpake_password returned %d\n\n", ret );
+            goto exit;
+        }
+    }
+#endif
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * 4. Handshake
+     */
+handshake:
+    mbedtls_printf( "  . Performing the SSL/TLS handshake..." );
+    fflush( stdout );
+
+    while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
+    {
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+        if( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS &&
+            ssl_async_keys.inject_error == SSL_ASYNC_INJECT_ERROR_CANCEL )
+        {
+            mbedtls_printf( " cancelling on injected error\n" );
+            break;
+        }
+#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
+
+        if( ! mbedtls_status_is_ssl_in_progress( ret ) )
+            break;
+
+        /* For event-driven IO, wait for socket to become available */
+        if( opt.event == 1 /* level triggered IO */ )
+        {
+#if defined(MBEDTLS_TIMING_C)
+            ret = idle( &client_fd, &timer, ret );
+#else
+            ret = idle( &client_fd, ret );
+#endif
+            if( ret != 0 )
+                goto reset;
+        }
+    }
+
+    if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED )
+    {
+        mbedtls_printf( " hello verification requested\n" );
+        ret = 0;
+        goto reset;
+    }
+    else if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int) -ret );
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+        if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED )
+        {
+            char vrfy_buf[512];
+            flags = mbedtls_ssl_get_verify_result( &ssl );
+
+            mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), "  ! ", flags );
+
+            mbedtls_printf( "%s\n", vrfy_buf );
+        }
+#endif
+
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+        if( opt.async_private_error < 0 )
+            /* Injected error only the first time round, to test reset */
+            ssl_async_keys.inject_error = SSL_ASYNC_INJECT_ERROR_NONE;
+#endif
+        goto reset;
+    }
+    else /* ret == 0 */
+    {
+        mbedtls_printf( " ok\n    [ Protocol is %s ]\n    [ Ciphersuite is %s ]\n",
+                mbedtls_ssl_get_version( &ssl ), mbedtls_ssl_get_ciphersuite( &ssl ) );
+    }
+
+    if( ( ret = mbedtls_ssl_get_record_expansion( &ssl ) ) >= 0 )
+        mbedtls_printf( "    [ Record expansion is %d ]\n", ret );
+    else
+        mbedtls_printf( "    [ Record expansion is unknown (compression) ]\n" );
+
+#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
+    mbedtls_printf( "    [ Maximum input fragment length is %u ]\n",
+                    (unsigned int) mbedtls_ssl_get_input_max_frag_len( &ssl ) );
+    mbedtls_printf( "    [ Maximum output fragment length is %u ]\n",
+                    (unsigned int) mbedtls_ssl_get_output_max_frag_len( &ssl ) );
+#endif
+
+#if defined(MBEDTLS_SSL_ALPN)
+    if( opt.alpn_string != NULL )
+    {
+        const char *alp = mbedtls_ssl_get_alpn_protocol( &ssl );
+        mbedtls_printf( "    [ Application Layer Protocol is %s ]\n",
+                alp ? alp : "(none)" );
+    }
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    /*
+     * 5. Verify the client certificate
+     */
+    mbedtls_printf( "  . Verifying peer X.509 certificate..." );
+
+    if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
+    {
+        char vrfy_buf[512];
+
+        mbedtls_printf( " failed\n" );
+
+        mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), "  ! ", flags );
+
+        mbedtls_printf( "%s\n", vrfy_buf );
+    }
+    else
+        mbedtls_printf( " ok\n" );
+
+    if( mbedtls_ssl_get_peer_cert( &ssl ) != NULL )
+    {
+        char crt_buf[512];
+
+        mbedtls_printf( "  . Peer certificate information    ...\n" );
+        mbedtls_x509_crt_info( crt_buf, sizeof( crt_buf ), "      ",
+                       mbedtls_ssl_get_peer_cert( &ssl ) );
+        mbedtls_printf( "%s\n", crt_buf );
+    }
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+    if( opt.eap_tls != 0 )
+    {
+        size_t j = 0;
+
+        if( ( ret = mbedtls_ssl_tls_prf( eap_tls_keying.tls_prf_type,
+                                         eap_tls_keying.master_secret,
+                                         sizeof( eap_tls_keying.master_secret ),
+                                         eap_tls_label,
+                                         eap_tls_keying.randbytes,
+                                         sizeof( eap_tls_keying.randbytes ),
+                                         eap_tls_keymaterial,
+                                         sizeof( eap_tls_keymaterial ) ) )
+                                         != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
+                            (unsigned int) -ret );
+            goto reset;
+        }
+
+        mbedtls_printf( "    EAP-TLS key material is:" );
+        for( j = 0; j < sizeof( eap_tls_keymaterial ); j++ )
+        {
+            if( j % 8 == 0 )
+                mbedtls_printf("\n    ");
+            mbedtls_printf("%02x ", eap_tls_keymaterial[j] );
+        }
+        mbedtls_printf("\n");
+
+        if( ( ret = mbedtls_ssl_tls_prf( eap_tls_keying.tls_prf_type, NULL, 0,
+                                         eap_tls_label,
+                                         eap_tls_keying.randbytes,
+                                         sizeof( eap_tls_keying.randbytes ),
+                                         eap_tls_iv,
+                                         sizeof( eap_tls_iv ) ) ) != 0 )
+         {
+             mbedtls_printf( " failed\n  ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
+                             (unsigned int) -ret );
+             goto reset;
+         }
+
+        mbedtls_printf( "    EAP-TLS IV is:" );
+        for( j = 0; j < sizeof( eap_tls_iv ); j++ )
+        {
+            if( j % 8 == 0 )
+                mbedtls_printf("\n    ");
+            mbedtls_printf("%02x ", eap_tls_iv[j] );
+        }
+        mbedtls_printf("\n");
+    }
+
+#if defined( MBEDTLS_SSL_DTLS_SRTP )
+    else if( opt.use_srtp != 0  )
+    {
+        size_t j = 0;
+        mbedtls_dtls_srtp_info dtls_srtp_negotiation_result;
+        mbedtls_ssl_get_dtls_srtp_negotiation_result( &ssl, &dtls_srtp_negotiation_result );
+
+        if( dtls_srtp_negotiation_result.chosen_dtls_srtp_profile
+                                == MBEDTLS_TLS_SRTP_UNSET )
+        {
+            mbedtls_printf( "    Unable to negotiate "
+                            "the use of DTLS-SRTP\n" );
+        }
+        else
+        {
+            if( ( ret = mbedtls_ssl_tls_prf( dtls_srtp_keying.tls_prf_type,
+                                             dtls_srtp_keying.master_secret,
+                                             sizeof( dtls_srtp_keying.master_secret ),
+                                             dtls_srtp_label,
+                                             dtls_srtp_keying.randbytes,
+                                             sizeof( dtls_srtp_keying.randbytes ),
+                                             dtls_srtp_key_material,
+                                             sizeof( dtls_srtp_key_material ) ) )
+                                             != 0 )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
+                                (unsigned int) -ret );
+                goto exit;
+            }
+
+            mbedtls_printf( "    DTLS-SRTP key material is:" );
+            for( j = 0; j < sizeof( dtls_srtp_key_material ); j++ )
+            {
+                if( j % 8 == 0 )
+                    mbedtls_printf( "\n    " );
+                mbedtls_printf( "%02x ", dtls_srtp_key_material[j] );
+            }
+            mbedtls_printf( "\n" );
+
+            /* produce a less readable output used to perform automatic checks
+             * - compare client and server output
+             * - interop test with openssl which client produces this kind of output
+             */
+            mbedtls_printf( "    Keying material: " );
+            for( j = 0; j < sizeof( dtls_srtp_key_material ); j++ )
+            {
+                mbedtls_printf( "%02X", dtls_srtp_key_material[j] );
+            }
+            mbedtls_printf( "\n" );
+
+            if ( dtls_srtp_negotiation_result.mki_len > 0 )
+            {
+                mbedtls_printf( "    DTLS-SRTP mki value: " );
+                for( j = 0; j < dtls_srtp_negotiation_result.mki_len; j++ )
+                {
+                    mbedtls_printf( "%02X", dtls_srtp_negotiation_result.mki_value[j] );
+                }
+            }
+            else
+            {
+                mbedtls_printf( "    DTLS-SRTP no mki value negotiated" );
+            }
+            mbedtls_printf( "\n" );
+
+        }
+    }
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    ret = report_cid_usage( &ssl, "initial handshake" );
+    if( ret != 0 )
+        goto exit;
+
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+    {
+        if( ( ret = mbedtls_ssl_set_cid( &ssl, opt.cid_enabled_renego,
+                                         cid_renego, cid_renego_len ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_set_cid returned %d\n\n",
+                            ret );
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+#if defined(MBEDTLS_MEMORY_DEBUG)
+    mbedtls_memory_buffer_alloc_cur_get( &current_heap_memory, &heap_blocks );
+    mbedtls_memory_buffer_alloc_max_get( &peak_heap_memory, &heap_blocks );
+    mbedtls_printf( "Heap memory usage after handshake: %lu bytes. Peak memory usage was %lu\n",
+                    (unsigned long) current_heap_memory, (unsigned long) peak_heap_memory );
+#endif  /* MBEDTLS_MEMORY_DEBUG */
+
+    if( opt.exchanges == 0 )
+        goto close_notify;
+
+    exchanges_left = opt.exchanges;
+data_exchange:
+    /*
+     * 6. Read the HTTP Request
+     */
+    mbedtls_printf( "  < Read from client:" );
+    fflush( stdout );
+
+    /*
+     * TLS and DTLS need different reading styles (stream vs datagram)
+     */
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM )
+    {
+        do
+        {
+            int terminated = 0;
+            len = opt.buffer_size - 1;
+            memset( buf, 0, opt.buffer_size );
+            ret = mbedtls_ssl_read( &ssl, buf, len );
+
+            if( mbedtls_status_is_ssl_in_progress( ret ) )
+            {
+                if( opt.event == 1 /* level triggered IO */ )
+                {
+#if defined(MBEDTLS_TIMING_C)
+                    idle( &client_fd, &timer, ret );
+#else
+                    idle( &client_fd, ret );
+#endif
+                }
+
+                continue;
+            }
+
+            if( ret <= 0 )
+            {
+                switch( ret )
+                {
+                    case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                        mbedtls_printf( " connection was closed gracefully\n" );
+                        goto close_notify;
+
+                    case 0:
+                    case MBEDTLS_ERR_NET_CONN_RESET:
+                        mbedtls_printf( " connection was reset by peer\n" );
+                        ret = MBEDTLS_ERR_NET_CONN_RESET;
+                        goto reset;
+
+                    default:
+                        mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n", (unsigned int) -ret );
+                        goto reset;
+                }
+            }
+
+            if( mbedtls_ssl_get_bytes_avail( &ssl ) == 0 )
+            {
+                len = ret;
+                buf[len] = '\0';
+                mbedtls_printf( " %d bytes read\n\n%s\n", len, (char *) buf );
+
+                /* End of message should be detected according to the syntax of the
+                 * application protocol (eg HTTP), just use a dummy test here. */
+                if( buf[len - 1] == '\n' )
+                    terminated = 1;
+            }
+            else
+            {
+                int extra_len, ori_len;
+                unsigned char *larger_buf;
+
+                ori_len = ret;
+                extra_len = (int) mbedtls_ssl_get_bytes_avail( &ssl );
+
+                larger_buf = mbedtls_calloc( 1, ori_len + extra_len + 1 );
+                if( larger_buf == NULL )
+                {
+                    mbedtls_printf( "  ! memory allocation failed\n" );
+                    ret = 1;
+                    goto reset;
+                }
+
+                memset( larger_buf, 0, ori_len + extra_len );
+                memcpy( larger_buf, buf, ori_len );
+
+                /* This read should never fail and get the whole cached data */
+                ret = mbedtls_ssl_read( &ssl, larger_buf + ori_len, extra_len );
+                if( ret != extra_len ||
+                    mbedtls_ssl_get_bytes_avail( &ssl ) != 0 )
+                {
+                    mbedtls_printf( "  ! mbedtls_ssl_read failed on cached data\n" );
+                    ret = 1;
+                    goto reset;
+                }
+
+                larger_buf[ori_len + extra_len] = '\0';
+                mbedtls_printf( " %d bytes read (%d + %d)\n\n%s\n",
+                        ori_len + extra_len, ori_len, extra_len,
+                        (char *) larger_buf );
+
+                /* End of message should be detected according to the syntax of the
+                 * application protocol (eg HTTP), just use a dummy test here. */
+                if( larger_buf[ori_len + extra_len - 1] == '\n' )
+                    terminated = 1;
+
+                mbedtls_free( larger_buf );
+            }
+
+            if( terminated )
+            {
+                ret = 0;
+                break;
+            }
+        }
+        while( 1 );
+    }
+    else /* Not stream, so datagram */
+    {
+        len = opt.buffer_size - 1;
+        memset( buf, 0, opt.buffer_size );
+
+        do
+        {
+            /* Without the call to `mbedtls_ssl_check_pending`, it might
+             * happen that the client sends application data in the same
+             * datagram as the Finished message concluding the handshake.
+             * In this case, the application data would be ready to be
+             * processed while the underlying transport wouldn't signal
+             * any further incoming data.
+             *
+             * See the test 'Event-driven I/O: session-id resume, UDP packing'
+             * in tests/ssl-opt.sh.
+             */
+
+            /* For event-driven IO, wait for socket to become available */
+            if( mbedtls_ssl_check_pending( &ssl ) == 0 &&
+                opt.event == 1 /* level triggered IO */ )
+            {
+#if defined(MBEDTLS_TIMING_C)
+                idle( &client_fd, &timer, MBEDTLS_ERR_SSL_WANT_READ );
+#else
+                idle( &client_fd, MBEDTLS_ERR_SSL_WANT_READ );
+#endif
+            }
+
+            ret = mbedtls_ssl_read( &ssl, buf, len );
+
+            /* Note that even if `mbedtls_ssl_check_pending` returns true,
+             * it can happen that the subsequent call to `mbedtls_ssl_read`
+             * returns `MBEDTLS_ERR_SSL_WANT_READ`, because the pending messages
+             * might be discarded (e.g. because they are retransmissions). */
+        }
+        while( mbedtls_status_is_ssl_in_progress( ret ) );
+
+        if( ret <= 0 )
+        {
+            switch( ret )
+            {
+                case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
+                    mbedtls_printf( " connection was closed gracefully\n" );
+                    ret = 0;
+                    goto close_notify;
+
+                default:
+                    mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n", (unsigned int) -ret );
+                    goto reset;
+            }
+        }
+
+        len = ret;
+        buf[len] = '\0';
+        mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
+        ret = 0;
+    }
+
+    /*
+     * 7a. Request renegotiation while client is waiting for input from us.
+     * (only on the first exchange, to be able to test retransmission)
+     */
+#if defined(MBEDTLS_SSL_RENEGOTIATION)
+    if( opt.renegotiate && exchanges_left == opt.exchanges )
+    {
+        mbedtls_printf( "  . Requestion renegotiation..." );
+        fflush( stdout );
+
+        while( ( ret = mbedtls_ssl_renegotiate( &ssl ) ) != 0 )
+        {
+            if( ! mbedtls_status_is_ssl_in_progress( ret ) )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_renegotiate returned %d\n\n", ret );
+                goto reset;
+            }
+
+            /* For event-driven IO, wait for socket to become available */
+            if( opt.event == 1 /* level triggered IO */ )
+            {
+#if defined(MBEDTLS_TIMING_C)
+                idle( &client_fd, &timer, ret );
+#else
+                idle( &client_fd, ret );
+#endif
+            }
+        }
+
+        mbedtls_printf( " ok\n" );
+    }
+#endif /* MBEDTLS_SSL_RENEGOTIATION */
+
+#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
+    ret = report_cid_usage( &ssl, "after renegotiation" );
+    if( ret != 0 )
+        goto exit;
+#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
+
+    /*
+     * 7. Write the 200 Response
+     */
+    mbedtls_printf( "  > Write to client:" );
+    fflush( stdout );
+
+    len = sprintf( (char *) buf, HTTP_RESPONSE,
+                   mbedtls_ssl_get_ciphersuite( &ssl ) );
+
+    /* Add padding to the response to reach opt.response_size in length */
+    if( opt.response_size != DFL_RESPONSE_SIZE &&
+        len < opt.response_size )
+    {
+        memset( buf + len, 'B', opt.response_size - len );
+        len += opt.response_size - len;
+    }
+
+    /* Truncate if response size is smaller than the "natural" size */
+    if( opt.response_size != DFL_RESPONSE_SIZE &&
+        len > opt.response_size )
+    {
+        len = opt.response_size;
+
+        /* Still end with \r\n unless that's really not possible */
+        if( len >= 2 ) buf[len - 2] = '\r';
+        if( len >= 1 ) buf[len - 1] = '\n';
+    }
+
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_STREAM )
+    {
+        for( written = 0, frags = 0; written < len; written += ret, frags++ )
+        {
+            while( ( ret = mbedtls_ssl_write( &ssl, buf + written, len - written ) )
+                           <= 0 )
+            {
+                if( ret == MBEDTLS_ERR_NET_CONN_RESET )
+                {
+                    mbedtls_printf( " failed\n  ! peer closed the connection\n\n" );
+                    goto reset;
+                }
+
+                if( ! mbedtls_status_is_ssl_in_progress( ret ) )
+                {
+                    mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n", ret );
+                    goto reset;
+                }
+
+                /* For event-driven IO, wait for socket to become available */
+                if( opt.event == 1 /* level triggered IO */ )
+                {
+#if defined(MBEDTLS_TIMING_C)
+                    idle( &client_fd, &timer, ret );
+#else
+                    idle( &client_fd, ret );
+#endif
+                }
+            }
+        }
+    }
+    else /* Not stream, so datagram */
+    {
+        while( 1 )
+        {
+            ret = mbedtls_ssl_write( &ssl, buf, len );
+
+            if( ! mbedtls_status_is_ssl_in_progress( ret ) )
+                break;
+
+            /* For event-driven IO, wait for socket to become available */
+            if( opt.event == 1 /* level triggered IO */ )
+            {
+#if defined(MBEDTLS_TIMING_C)
+                idle( &client_fd, &timer, ret );
+#else
+                idle( &client_fd, ret );
+#endif
+            }
+        }
+
+        if( ret < 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_write returned %d\n\n", ret );
+            goto reset;
+        }
+
+        frags = 1;
+        written = ret;
+    }
+
+    buf[written] = '\0';
+    mbedtls_printf( " %d bytes written in %d fragments\n\n%s\n", written, frags, (char *) buf );
+    ret = 0;
+
+    /*
+     * 7b. Simulate serialize/deserialize and go back to data exchange
+     */
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+    if( opt.serialize != 0 )
+    {
+        size_t buf_len;
+
+        mbedtls_printf( "  . Serializing live connection..." );
+
+        ret = mbedtls_ssl_context_save( &ssl, NULL, 0, &buf_len );
+        if( ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_context_save returned "
+                            "-0x%x\n\n", (unsigned int) -ret );
+
+            goto exit;
+        }
+
+        if( ( context_buf = mbedtls_calloc( 1, buf_len ) ) == NULL )
+        {
+            mbedtls_printf( " failed\n  ! Couldn't allocate buffer for "
+                            "serialized context" );
+
+            goto exit;
+        }
+        context_buf_len = buf_len;
+
+        if( ( ret = mbedtls_ssl_context_save( &ssl, context_buf,
+                                              buf_len, &buf_len ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_ssl_context_save returned "
+                            "-0x%x\n\n", (unsigned int) -ret );
+
+            goto exit;
+        }
+
+        mbedtls_printf( " ok\n" );
+
+        /* Save serialized context to the 'opt.context_file' as a base64 code */
+        if( 0 < strlen( opt.context_file ) )
+        {
+            FILE *b64_file;
+            uint8_t *b64_buf;
+            size_t b64_len;
+
+            mbedtls_printf( "  . Save serialized context to a file... " );
+
+            mbedtls_base64_encode( NULL, 0, &b64_len, context_buf, buf_len );
+
+            if( ( b64_buf = mbedtls_calloc( 1, b64_len ) ) == NULL )
+            {
+                mbedtls_printf( "failed\n  ! Couldn't allocate buffer for "
+                                "the base64 code\n" );
+                goto exit;
+            }
+
+            if( ( ret = mbedtls_base64_encode( b64_buf, b64_len, &b64_len,
+                                               context_buf, buf_len ) ) != 0 )
+            {
+                mbedtls_printf( "failed\n  ! mbedtls_base64_encode returned "
+                            "-0x%x\n", (unsigned int) -ret );
+                mbedtls_free( b64_buf );
+                goto exit;
+            }
+
+            if( ( b64_file = fopen( opt.context_file, "w" ) ) == NULL )
+            {
+                mbedtls_printf( "failed\n  ! Cannot open '%s' for writing.\n",
+                                opt.context_file );
+                mbedtls_free( b64_buf );
+                goto exit;
+            }
+
+            if( b64_len != fwrite( b64_buf, 1, b64_len, b64_file ) )
+            {
+                mbedtls_printf( "failed\n  ! fwrite(%ld bytes) failed\n",
+                                (long) b64_len );
+                mbedtls_free( b64_buf );
+                fclose( b64_file );
+                goto exit;
+            }
+
+            mbedtls_free( b64_buf );
+            fclose( b64_file );
+
+            mbedtls_printf( "ok\n" );
+        }
+
+        /*
+         * This simulates a workflow where you have a long-lived server
+         * instance, potentially with a pool of ssl_context objects, and you
+         * just want to re-use one while the connection is inactive: in that
+         * case you can just reset() it, and then it's ready to receive
+         * serialized data from another connection (or the same here).
+         */
+        if( opt.serialize == 1 )
+        {
+            /* nothing to do here, done by context_save() already */
+            mbedtls_printf( "  . Context has been reset... ok\n" );
+        }
+
+        /*
+         * This simulates a workflow where you have one server instance per
+         * connection, and want to release it entire when the connection is
+         * inactive, and spawn it again when needed again - this would happen
+         * between ssl_free() and ssl_init() below, together with any other
+         * teardown/startup code needed - for example, preparing the
+         * ssl_config again (see section 3 "setup stuff" in this file).
+         */
+        if( opt.serialize == 2 )
+        {
+            mbedtls_printf( "  . Freeing and reinitializing context..." );
+
+            mbedtls_ssl_free( &ssl );
+
+            mbedtls_ssl_init( &ssl );
+
+            if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
+            {
+                mbedtls_printf( " failed\n  ! mbedtls_ssl_setup returned "
+                                "-0x%x\n\n", (unsigned int) -ret );
+                goto exit;
+            }
+
+            /*
+             * This illustrates the minimum amount of things you need to set
+             * up, however you could set up much more if desired, for example
+             * if you want to share your set up code between the case of
+             * establishing a new connection and this case.
+             */
+            if( opt.nbio == 2 )
+                mbedtls_ssl_set_bio( &ssl, &client_fd, delayed_send,
+                                     delayed_recv, NULL );
+            else
+                mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send,
+                            mbedtls_net_recv,
+                            opt.nbio == 0 ? mbedtls_net_recv_timeout : NULL );
+
+#if defined(MBEDTLS_TIMING_C)
+                mbedtls_ssl_set_timer_cb( &ssl, &timer,
+                                          mbedtls_timing_set_delay,
+                                          mbedtls_timing_get_delay );
+#endif /* MBEDTLS_TIMING_C */
+
+            mbedtls_printf( " ok\n" );
+        }
+
+        mbedtls_printf( "  . Deserializing connection..." );
+
+        if( ( ret = mbedtls_ssl_context_load( &ssl, context_buf,
+                                              buf_len ) ) != 0 )
+        {
+            mbedtls_printf( "failed\n  ! mbedtls_ssl_context_load returned "
+                            "-0x%x\n\n", (unsigned int) -ret );
+
+            goto exit;
+        }
+
+        mbedtls_free( context_buf );
+        context_buf = NULL;
+        context_buf_len = 0;
+
+        mbedtls_printf( " ok\n" );
+    }
+#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */
+
+    /*
+     * 7c. Continue doing data exchanges?
+     */
+    if( --exchanges_left > 0 )
+        goto data_exchange;
+
+    /*
+     * 8. Done, cleanly close the connection
+     */
+close_notify:
+    mbedtls_printf( "  . Closing the connection..." );
+
+    /* No error checking, the connection might be closed already */
+    do ret = mbedtls_ssl_close_notify( &ssl );
+    while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+    ret = 0;
+
+    mbedtls_printf( " done\n" );
+
+    goto reset;
+
+    /*
+     * Cleanup and exit
+     */
+exit:
+#ifdef MBEDTLS_ERROR_C
+    if( ret != 0 )
+    {
+        char error_buf[100];
+        mbedtls_strerror( ret, error_buf, 100 );
+        mbedtls_printf("Last error was: -0x%X - %s\n\n", (unsigned int) -ret, error_buf );
+    }
+#endif
+
+    if( opt.query_config_mode == DFL_QUERY_CONFIG_MODE )
+    {
+        mbedtls_printf( "  . Cleaning up..." );
+        fflush( stdout );
+    }
+
+    mbedtls_net_free( &client_fd );
+    mbedtls_net_free( &listen_fd );
+
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_FS_IO)
+    mbedtls_dhm_free( &dhm );
+#endif
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+    mbedtls_x509_crt_free( &cacert );
+    mbedtls_x509_crt_free( &srvcert );
+    mbedtls_pk_free( &pkey );
+    mbedtls_x509_crt_free( &srvcert2 );
+    mbedtls_pk_free( &pkey2 );
+#endif
+#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
+    for( i = 0; (size_t) i < ssl_async_keys.slots_used; i++ )
+    {
+        if( ssl_async_keys.slots[i].pk_owned )
+        {
+            mbedtls_pk_free( ssl_async_keys.slots[i].pk );
+            mbedtls_free( ssl_async_keys.slots[i].pk );
+            ssl_async_keys.slots[i].pk = NULL;
+        }
+    }
+#endif
+#if defined(SNI_OPTION)
+    sni_free( sni_info );
+#endif
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
+    ret = psk_free( psk_info );
+    if( ( ret != 0 ) && ( opt.query_config_mode == DFL_QUERY_CONFIG_MODE ) )
+        mbedtls_printf( "Failed to list of opaque PSKs - error was %d\n", ret );
+#endif
+#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_FS_IO)
+    mbedtls_dhm_free( &dhm );
+#endif
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) && \
+    defined(MBEDTLS_USE_PSA_CRYPTO)
+    if( opt.psk_opaque != 0 )
+    {
+        /* This is ok even if the slot hasn't been
+         * initialized (we might have jumed here
+         * immediately because of bad cmd line params,
+         * for example). */
+        status = psa_destroy_key( psk_slot );
+        if( ( status != PSA_SUCCESS ) &&
+            ( opt.query_config_mode == DFL_QUERY_CONFIG_MODE ) )
+        {
+            mbedtls_printf( "Failed to destroy key slot %u - error was %d",
+                            (unsigned) psk_slot, (int) status );
+        }
+    }
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED &&
+          MBEDTLS_USE_PSA_CRYPTO */
+
+    mbedtls_ssl_free( &ssl );
+    mbedtls_ssl_config_free( &conf );
+    rng_free( &rng );
+
+#if defined(MBEDTLS_SSL_CACHE_C)
+    mbedtls_ssl_cache_free( &cache );
+#endif
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+    mbedtls_ssl_ticket_free( &ticket_ctx );
+#endif
+#if defined(MBEDTLS_SSL_COOKIE_C)
+    mbedtls_ssl_cookie_free( &cookie_ctx );
+#endif
+
+    mbedtls_free( buf );
+
+#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
+    if( context_buf != NULL )
+        mbedtls_platform_zeroize( context_buf, context_buf_len );
+    mbedtls_free( context_buf );
+#endif
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    mbedtls_psa_crypto_free( );
+#endif
+
+#if defined(MBEDTLS_TEST_HOOKS)
+    /* Let test hooks detect errors such as resource leaks.
+     * Don't do it in query_config mode, because some test code prints
+     * information to stdout and this gets mixed with the regular output. */
+    if( opt.query_config_mode == DFL_QUERY_CONFIG_MODE )
+    {
+        if( test_hooks_failure_detected( ) )
+        {
+            if( ret == 0 )
+                ret = 1;
+            mbedtls_printf( "Test hooks detected errors.\n" );
+        }
+    }
+    test_hooks_free( );
+#endif /* MBEDTLS_TEST_HOOKS */
+
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+#if defined(MBEDTLS_MEMORY_DEBUG)
+    mbedtls_memory_buffer_alloc_status();
+#endif
+    mbedtls_memory_buffer_alloc_free();
+#endif  /* MBEDTLS_MEMORY_BUFFER_ALLOC_C */
+
+    if( opt.query_config_mode == DFL_QUERY_CONFIG_MODE )
+    {
+        mbedtls_printf( " done.\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "  + Press Enter to exit this program.\n" );
+        fflush( stdout ); getchar();
+#endif
+    }
+
+    // Shell can not handle large exit numbers -> 1 for errors
+    if( ret < 0 )
+        ret = 1;
+
+    if( opt.query_config_mode == DFL_QUERY_CONFIG_MODE )
+        mbedtls_exit( ret );
+    else
+        mbedtls_exit( query_config_ret );
+}
+#endif /* !MBEDTLS_SSL_TEST_IMPOSSIBLE && MBEDTLS_SSL_SRV_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_test_common_source.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_test_common_source.c
new file mode 100644
index 0000000..d9e3607
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_test_common_source.c
@@ -0,0 +1,305 @@
+/*
+ *  Common source code for SSL test programs. This file is included by
+ *  both ssl_client2.c and ssl_server2.c and is intended for source
+ *  code that is textually identical in both programs, but that cannot be
+ *  compiled separately because it refers to types or macros that are
+ *  different in the two programs, or because it would have an incomplete
+ *  type.
+ *
+ *  This file is meant to be #include'd and cannot be compiled separately.
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+int eap_tls_key_derivation( void *p_expkey,
+                            const unsigned char *ms,
+                            const unsigned char *kb,
+                            size_t maclen,
+                            size_t keylen,
+                            size_t ivlen,
+                            const unsigned char client_random[32],
+                            const unsigned char server_random[32],
+                            mbedtls_tls_prf_types tls_prf_type )
+{
+    eap_tls_keys *keys = (eap_tls_keys *)p_expkey;
+
+    ( ( void ) kb );
+    memcpy( keys->master_secret, ms, sizeof( keys->master_secret ) );
+    memcpy( keys->randbytes, client_random, 32 );
+    memcpy( keys->randbytes + 32, server_random, 32 );
+    keys->tls_prf_type = tls_prf_type;
+
+    if( opt.debug_level > 2 )
+    {
+        mbedtls_printf("exported maclen is %u\n", (unsigned)maclen);
+        mbedtls_printf("exported keylen is %u\n", (unsigned)keylen);
+        mbedtls_printf("exported ivlen is %u\n", (unsigned)ivlen);
+    }
+    return( 0 );
+}
+
+int nss_keylog_export( void *p_expkey,
+                       const unsigned char *ms,
+                       const unsigned char *kb,
+                       size_t maclen,
+                       size_t keylen,
+                       size_t ivlen,
+                       const unsigned char client_random[32],
+                       const unsigned char server_random[32],
+                       mbedtls_tls_prf_types tls_prf_type )
+{
+    char nss_keylog_line[ 200 ];
+    size_t const client_random_len = 32;
+    size_t const master_secret_len = 48;
+    size_t len = 0;
+    size_t j;
+    int ret = 0;
+
+    ((void) p_expkey);
+    ((void) kb);
+    ((void) maclen);
+    ((void) keylen);
+    ((void) ivlen);
+    ((void) server_random);
+    ((void) tls_prf_type);
+
+    len += sprintf( nss_keylog_line + len,
+                    "%s", "CLIENT_RANDOM " );
+
+    for( j = 0; j < client_random_len; j++ )
+    {
+        len += sprintf( nss_keylog_line + len,
+                        "%02x", client_random[j] );
+    }
+
+    len += sprintf( nss_keylog_line + len, " " );
+
+    for( j = 0; j < master_secret_len; j++ )
+    {
+        len += sprintf( nss_keylog_line + len,
+                        "%02x", ms[j] );
+    }
+
+    len += sprintf( nss_keylog_line + len, "\n" );
+    nss_keylog_line[ len ] = '\0';
+
+    mbedtls_printf( "\n" );
+    mbedtls_printf( "---------------- NSS KEYLOG -----------------\n" );
+    mbedtls_printf( "%s", nss_keylog_line );
+    mbedtls_printf( "---------------------------------------------\n" );
+
+    if( opt.nss_keylog_file != NULL )
+    {
+        FILE *f;
+
+        if( ( f = fopen( opt.nss_keylog_file, "a" ) ) == NULL )
+        {
+            ret = -1;
+            goto exit;
+        }
+
+        if( fwrite( nss_keylog_line, 1, len, f ) != len )
+        {
+            ret = -1;
+            fclose( f );
+            goto exit;
+        }
+
+        fclose( f );
+    }
+
+exit:
+    mbedtls_platform_zeroize( nss_keylog_line,
+                              sizeof( nss_keylog_line ) );
+    return( ret );
+}
+
+#if defined( MBEDTLS_SSL_DTLS_SRTP )
+int dtls_srtp_key_derivation( void *p_expkey,
+                              const unsigned char *ms,
+                              const unsigned char *kb,
+                              size_t maclen,
+                              size_t keylen,
+                              size_t ivlen,
+                              const unsigned char client_random[32],
+                              const unsigned char server_random[32],
+                              mbedtls_tls_prf_types tls_prf_type )
+{
+    dtls_srtp_keys *keys = (dtls_srtp_keys *)p_expkey;
+
+    ( ( void ) kb );
+    memcpy( keys->master_secret, ms, sizeof( keys->master_secret ) );
+    memcpy( keys->randbytes, client_random, 32 );
+    memcpy( keys->randbytes + 32, server_random, 32 );
+    keys->tls_prf_type = tls_prf_type;
+
+    if( opt.debug_level > 2 )
+    {
+        mbedtls_printf( "exported maclen is %u\n", (unsigned) maclen );
+        mbedtls_printf( "exported keylen is %u\n", (unsigned) keylen );
+        mbedtls_printf( "exported ivlen is %u\n", (unsigned) ivlen );
+    }
+    return( 0 );
+}
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+#if defined(MBEDTLS_SSL_RECORD_CHECKING)
+int ssl_check_record( mbedtls_ssl_context const *ssl,
+                      unsigned char const *buf, size_t len )
+{
+    int ret;
+    unsigned char *tmp_buf;
+
+    /* Record checking may modify the input buffer,
+     * so make a copy. */
+    tmp_buf = mbedtls_calloc( 1, len );
+    if( tmp_buf == NULL )
+        return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
+    memcpy( tmp_buf, buf, len );
+
+    ret = mbedtls_ssl_check_record( ssl, tmp_buf, len );
+    if( ret != MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE )
+    {
+        int ret_repeated;
+
+        /* Test-only: Make sure that mbedtls_ssl_check_record()
+         *            doesn't alter state. */
+        memcpy( tmp_buf, buf, len ); /* Restore buffer */
+        ret_repeated = mbedtls_ssl_check_record( ssl, tmp_buf, len );
+        if( ret != ret_repeated )
+        {
+            mbedtls_printf( "mbedtls_ssl_check_record() returned inconsistent results.\n" );
+            return( -1 );
+        }
+
+        switch( ret )
+        {
+            case 0:
+                break;
+
+            case MBEDTLS_ERR_SSL_INVALID_RECORD:
+                if( opt.debug_level > 1 )
+                    mbedtls_printf( "mbedtls_ssl_check_record() detected invalid record.\n" );
+                break;
+
+            case MBEDTLS_ERR_SSL_INVALID_MAC:
+                if( opt.debug_level > 1 )
+                    mbedtls_printf( "mbedtls_ssl_check_record() detected unauthentic record.\n" );
+                break;
+
+            case MBEDTLS_ERR_SSL_UNEXPECTED_RECORD:
+                if( opt.debug_level > 1 )
+                    mbedtls_printf( "mbedtls_ssl_check_record() detected unexpected record.\n" );
+                break;
+
+            default:
+                mbedtls_printf( "mbedtls_ssl_check_record() failed fatally with -%#04x.\n", (unsigned int) -ret );
+                return( -1 );
+        }
+
+        /* Regardless of the outcome, forward the record to the stack. */
+    }
+
+    mbedtls_free( tmp_buf );
+
+    return( 0 );
+}
+#endif /* MBEDTLS_SSL_RECORD_CHECKING */
+
+int recv_cb( void *ctx, unsigned char *buf, size_t len )
+{
+    io_ctx_t *io_ctx = (io_ctx_t*) ctx;
+    size_t recv_len;
+    int ret;
+
+    if( opt.nbio == 2 )
+        ret = delayed_recv( io_ctx->net, buf, len );
+    else
+        ret = mbedtls_net_recv( io_ctx->net, buf, len );
+    if( ret < 0 )
+        return( ret );
+    recv_len = (size_t) ret;
+
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+    {
+        /* Here's the place to do any datagram/record checking
+         * in between receiving the packet from the underlying
+         * transport and passing it on to the TLS stack. */
+#if defined(MBEDTLS_SSL_RECORD_CHECKING)
+        if( ssl_check_record( io_ctx->ssl, buf, recv_len ) != 0 )
+            return( -1 );
+#endif /* MBEDTLS_SSL_RECORD_CHECKING */
+    }
+
+    return( (int) recv_len );
+}
+
+int recv_timeout_cb( void *ctx, unsigned char *buf, size_t len,
+                     uint32_t timeout )
+{
+    io_ctx_t *io_ctx = (io_ctx_t*) ctx;
+    int ret;
+    size_t recv_len;
+
+    ret = mbedtls_net_recv_timeout( io_ctx->net, buf, len, timeout );
+    if( ret < 0 )
+        return( ret );
+    recv_len = (size_t) ret;
+
+    if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+    {
+        /* Here's the place to do any datagram/record checking
+         * in between receiving the packet from the underlying
+         * transport and passing it on to the TLS stack. */
+#if defined(MBEDTLS_SSL_RECORD_CHECKING)
+        if( ssl_check_record( io_ctx->ssl, buf, recv_len ) != 0 )
+            return( -1 );
+#endif /* MBEDTLS_SSL_RECORD_CHECKING */
+    }
+
+    return( (int) recv_len );
+}
+
+int send_cb( void *ctx, unsigned char const *buf, size_t len )
+{
+    io_ctx_t *io_ctx = (io_ctx_t*) ctx;
+
+    if( opt.nbio == 2 )
+        return( delayed_send( io_ctx->net, buf, len ) );
+
+    return( mbedtls_net_send( io_ctx->net, buf, len ) );
+}
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+int ssl_sig_hashes_for_test[] = {
+#if defined(MBEDTLS_SHA512_C)
+    MBEDTLS_MD_SHA512,
+    MBEDTLS_MD_SHA384,
+#endif
+#if defined(MBEDTLS_SHA256_C)
+    MBEDTLS_MD_SHA256,
+    MBEDTLS_MD_SHA224,
+#endif
+#if defined(MBEDTLS_SHA1_C)
+    /* Allow SHA-1 as we use it extensively in tests. */
+    MBEDTLS_MD_SHA1,
+#endif
+    MBEDTLS_MD_NONE
+};
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_test_lib.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_test_lib.c
new file mode 100644
index 0000000..1bb9d61
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_test_lib.c
@@ -0,0 +1,357 @@
+/*
+ *  Common code library for SSL test programs.
+ *
+ *  In addition to the functions in this file, there is shared source code
+ *  that cannot be compiled separately in "ssl_test_common_source.c".
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include "ssl_test_lib.h"
+
+#if defined(MBEDTLS_TEST_HOOKS)
+#include "test/helpers.h"
+#endif
+
+#if !defined(MBEDTLS_SSL_TEST_IMPOSSIBLE)
+
+void my_debug( void *ctx, int level,
+               const char *file, int line,
+               const char *str )
+{
+    const char *p, *basename;
+
+    /* Extract basename from file */
+    for( p = basename = file; *p != '\0'; p++ )
+        if( *p == '/' || *p == '\\' )
+            basename = p + 1;
+
+    mbedtls_fprintf( (FILE *) ctx, "%s:%04d: |%d| %s",
+                     basename, line, level, str );
+    fflush( (FILE *) ctx  );
+}
+
+mbedtls_time_t dummy_constant_time( mbedtls_time_t* time )
+{
+    (void) time;
+    return 0x5af2a056;
+}
+
+#if !defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
+static int dummy_entropy( void *data, unsigned char *output, size_t len )
+{
+    size_t i;
+    int ret;
+    (void) data;
+
+    ret = mbedtls_entropy_func( data, output, len );
+    for( i = 0; i < len; i++ )
+    {
+        //replace result with pseudo random
+        output[i] = (unsigned char) rand();
+    }
+    return( ret );
+}
+#endif
+
+void rng_init( rng_context_t *rng )
+{
+#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
+    (void) rng;
+    psa_crypto_init( );
+#else /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+
+#if defined(MBEDTLS_CTR_DRBG_C)
+    mbedtls_ctr_drbg_init( &rng->drbg );
+#elif defined(MBEDTLS_HMAC_DRBG_C)
+    mbedtls_hmac_drbg_init( &rng->drbg );
+#else
+#error "No DRBG available"
+#endif
+
+    mbedtls_entropy_init( &rng->entropy );
+#endif /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+}
+
+int rng_seed( rng_context_t *rng, int reproducible, const char *pers )
+{
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if( reproducible )
+    {
+        mbedtls_fprintf( stderr,
+                         "MBEDTLS_USE_PSA_CRYPTO does not support reproducible mode.\n" );
+        return( -1 );
+    }
+#endif
+#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
+    /* The PSA crypto RNG does its own seeding. */
+    (void) rng;
+    (void) pers;
+    if( reproducible )
+    {
+        mbedtls_fprintf( stderr,
+                         "The PSA RNG does not support reproducible mode.\n" );
+        return( -1 );
+    }
+    return( 0 );
+#else /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+    int ( *f_entropy )( void *, unsigned char *, size_t ) =
+        ( reproducible ? dummy_entropy : mbedtls_entropy_func );
+
+    if ( reproducible )
+        srand( 1 );
+
+#if defined(MBEDTLS_CTR_DRBG_C)
+    int ret = mbedtls_ctr_drbg_seed( &rng->drbg,
+                                     f_entropy, &rng->entropy,
+                                     (const unsigned char *) pers,
+                                     strlen( pers ) );
+#elif defined(MBEDTLS_HMAC_DRBG_C)
+#if defined(MBEDTLS_SHA256_C)
+    const mbedtls_md_type_t md_type = MBEDTLS_MD_SHA256;
+#elif defined(MBEDTLS_SHA512_C)
+    const mbedtls_md_type_t md_type = MBEDTLS_MD_SHA512;
+#else
+#error "No message digest available for HMAC_DRBG"
+#endif
+    int ret = mbedtls_hmac_drbg_seed( &rng->drbg,
+                                      mbedtls_md_info_from_type( md_type ),
+                                      f_entropy, &rng->entropy,
+                                      (const unsigned char *) pers,
+                                      strlen( pers ) );
+#else /* !defined(MBEDTLS_CTR_DRBG_C) && !defined(MBEDTLS_HMAC_DRBG_C) */
+#error "No DRBG available"
+#endif /* !defined(MBEDTLS_CTR_DRBG_C) && !defined(MBEDTLS_HMAC_DRBG_C) */
+
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned -0x%x\n",
+                        (unsigned int) -ret );
+        return( ret );
+    }
+#endif /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+
+    return( 0 );
+}
+
+void rng_free( rng_context_t *rng )
+{
+#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
+    (void) rng;
+    /* Deinitialize the PSA crypto subsystem. This deactivates all PSA APIs.
+     * This is ok because none of our applications try to do any crypto after
+     * deinitializing the RNG. */
+    mbedtls_psa_crypto_free( );
+#else /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+
+#if defined(MBEDTLS_CTR_DRBG_C)
+    mbedtls_ctr_drbg_free( &rng->drbg );
+#elif defined(MBEDTLS_HMAC_DRBG_C)
+    mbedtls_hmac_drbg_free( &rng->drbg );
+#else
+#error "No DRBG available"
+#endif
+
+    mbedtls_entropy_free( &rng->entropy );
+#endif /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+}
+
+int rng_get( void *p_rng, unsigned char *output, size_t output_len )
+{
+#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
+    (void) p_rng;
+    return( mbedtls_psa_get_random( MBEDTLS_PSA_RANDOM_STATE,
+                                    output, output_len ) );
+#else /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+    rng_context_t *rng = p_rng;
+
+#if defined(MBEDTLS_CTR_DRBG_C)
+    return( mbedtls_ctr_drbg_random( &rng->drbg, output, output_len ) );
+#elif defined(MBEDTLS_HMAC_DRBG_C)
+    return( mbedtls_hmac_drbg_random( &rng->drbg, output, output_len ) );
+#else
+#error "No DRBG available"
+#endif
+
+#endif /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+}
+
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+int ca_callback( void *data, mbedtls_x509_crt const *child,
+                 mbedtls_x509_crt **candidates )
+{
+    int ret = 0;
+    mbedtls_x509_crt *ca = (mbedtls_x509_crt *) data;
+    mbedtls_x509_crt *first;
+
+    /* This is a test-only implementation of the CA callback
+     * which always returns the entire list of trusted certificates.
+     * Production implementations managing a large number of CAs
+     * should use an efficient presentation and lookup for the
+     * set of trusted certificates (such as a hashtable) and only
+     * return those trusted certificates which satisfy basic
+     * parental checks, such as the matching of child `Issuer`
+     * and parent `Subject` field or matching key identifiers. */
+    ((void) child);
+
+    first = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
+    if( first == NULL )
+    {
+        ret = -1;
+        goto exit;
+    }
+    mbedtls_x509_crt_init( first );
+
+    if( mbedtls_x509_crt_parse_der( first, ca->raw.p, ca->raw.len ) != 0 )
+    {
+        ret = -1;
+        goto exit;
+    }
+
+    while( ca->next != NULL )
+    {
+        ca = ca->next;
+        if( mbedtls_x509_crt_parse_der( first, ca->raw.p, ca->raw.len ) != 0 )
+        {
+            ret = -1;
+            goto exit;
+        }
+    }
+
+exit:
+
+    if( ret != 0 )
+    {
+        mbedtls_x509_crt_free( first );
+        mbedtls_free( first );
+        first = NULL;
+    }
+
+    *candidates = first;
+    return( ret );
+}
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+
+int delayed_recv( void *ctx, unsigned char *buf, size_t len )
+{
+    static int first_try = 1;
+    int ret;
+
+    if( first_try )
+    {
+        first_try = 0;
+        return( MBEDTLS_ERR_SSL_WANT_READ );
+    }
+
+    ret = mbedtls_net_recv( ctx, buf, len );
+    if( ret != MBEDTLS_ERR_SSL_WANT_READ )
+        first_try = 1; /* Next call will be a new operation */
+    return( ret );
+}
+
+int delayed_send( void *ctx, const unsigned char *buf, size_t len )
+{
+    static int first_try = 1;
+    int ret;
+
+    if( first_try )
+    {
+        first_try = 0;
+        return( MBEDTLS_ERR_SSL_WANT_WRITE );
+    }
+
+    ret = mbedtls_net_send( ctx, buf, len );
+    if( ret != MBEDTLS_ERR_SSL_WANT_WRITE )
+        first_try = 1; /* Next call will be a new operation */
+    return( ret );
+}
+
+#if !defined(MBEDTLS_TIMING_C)
+int idle( mbedtls_net_context *fd,
+          int idle_reason )
+#else
+int idle( mbedtls_net_context *fd,
+          mbedtls_timing_delay_context *timer,
+          int idle_reason )
+#endif
+{
+    int ret;
+    int poll_type = 0;
+
+    if( idle_reason == MBEDTLS_ERR_SSL_WANT_WRITE )
+        poll_type = MBEDTLS_NET_POLL_WRITE;
+    else if( idle_reason == MBEDTLS_ERR_SSL_WANT_READ )
+        poll_type = MBEDTLS_NET_POLL_READ;
+#if !defined(MBEDTLS_TIMING_C)
+    else
+        return( 0 );
+#endif
+
+    while( 1 )
+    {
+        /* Check if timer has expired */
+#if defined(MBEDTLS_TIMING_C)
+        if( timer != NULL &&
+            mbedtls_timing_get_delay( timer ) == 2 )
+        {
+            break;
+        }
+#endif /* MBEDTLS_TIMING_C */
+
+        /* Check if underlying transport became available */
+        if( poll_type != 0 )
+        {
+            ret = mbedtls_net_poll( fd, poll_type, 0 );
+            if( ret < 0 )
+                return( ret );
+            if( ret == poll_type )
+                break;
+        }
+    }
+
+    return( 0 );
+}
+
+#if defined(MBEDTLS_TEST_HOOKS)
+
+void test_hooks_init( void )
+{
+    mbedtls_test_info_reset( );
+
+#if defined(MBEDTLS_TEST_MUTEX_USAGE)
+    mbedtls_test_mutex_usage_init( );
+#endif
+}
+
+int test_hooks_failure_detected( void )
+{
+#if defined(MBEDTLS_TEST_MUTEX_USAGE)
+    /* Errors are reported via mbedtls_test_info. */
+    mbedtls_test_mutex_usage_check( );
+#endif
+
+    if( mbedtls_test_info.result != MBEDTLS_TEST_RESULT_SUCCESS )
+        return( 1 );
+    return( 0 );
+}
+
+void test_hooks_free( void )
+{
+}
+
+#endif /* MBEDTLS_TEST_HOOKS */
+
+#endif /* !defined(MBEDTLS_SSL_TEST_IMPOSSIBLE) */
diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_test_lib.h b/lib/mbedtls-2.27.0/programs/ssl/ssl_test_lib.h
new file mode 100644
index 0000000..98751a0
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_test_lib.h
@@ -0,0 +1,294 @@
+/*
+ *  Common code for SSL test programs
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#ifndef MBEDTLS_PROGRAMS_SSL_SSL_TEST_LIB_H
+#define MBEDTLS_PROGRAMS_SSL_SSL_TEST_LIB_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_calloc     calloc
+#define mbedtls_free       free
+#define mbedtls_time       time
+#define mbedtls_time_t     time_t
+#define mbedtls_printf     printf
+#define mbedtls_fprintf    fprintf
+#define mbedtls_snprintf   snprintf
+#define mbedtls_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif
+
+#undef HAVE_RNG
+#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) &&         \
+    ( defined(MBEDTLS_USE_PSA_CRYPTO) ||                \
+      defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG) )
+#define HAVE_RNG
+#elif defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_CTR_DRBG_C)
+#define HAVE_RNG
+#elif defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_HMAC_DRBG_C) &&     \
+    ( defined(MBEDTLS_SHA256_C) || defined(MBEDTLS_SHA512_C) )
+#define HAVE_RNG
+#endif
+
+#if !defined(MBEDTLS_NET_C) ||                              \
+    !defined(MBEDTLS_SSL_TLS_C) ||                          \
+    defined(MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER)
+#define MBEDTLS_SSL_TEST_IMPOSSIBLE                             \
+    "MBEDTLS_NET_C and/or "                                     \
+    "MBEDTLS_SSL_TLS_C not defined, "                           \
+    "and/or MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER defined.\n"
+#elif !defined(HAVE_RNG)
+#define MBEDTLS_SSL_TEST_IMPOSSIBLE             \
+    "No random generator is available.\n"
+#else
+#undef MBEDTLS_SSL_TEST_IMPOSSIBLE
+
+#undef HAVE_RNG
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/hmac_drbg.h"
+#include "mbedtls/certs.h"
+#include "mbedtls/x509.h"
+#include "mbedtls/error.h"
+#include "mbedtls/debug.h"
+#include "mbedtls/timing.h"
+#include "mbedtls/base64.h"
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
+#include "psa/crypto.h"
+#include "mbedtls/psa_util.h"
+#endif
+
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+#include "mbedtls/memory_buffer_alloc.h"
+#endif
+
+#include <test/helpers.h>
+
+#include "../test/query_config.h"
+
+#if defined(MBEDTLS_SSL_EXPORT_KEYS)
+
+typedef struct eap_tls_keys
+{
+    unsigned char master_secret[48];
+    unsigned char randbytes[64];
+    mbedtls_tls_prf_types tls_prf_type;
+} eap_tls_keys;
+
+#if defined( MBEDTLS_SSL_DTLS_SRTP )
+
+/* Supported SRTP mode needs a maximum of :
+ * - 16 bytes for key (AES-128)
+ * - 14 bytes SALT
+ * One for sender, one for receiver context
+ */
+#define MBEDTLS_TLS_SRTP_MAX_KEY_MATERIAL_LENGTH    60
+
+typedef struct dtls_srtp_keys
+{
+    unsigned char master_secret[48];
+    unsigned char randbytes[64];
+    mbedtls_tls_prf_types tls_prf_type;
+} dtls_srtp_keys;
+
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+
+#endif /* MBEDTLS_SSL_EXPORT_KEYS */
+
+typedef struct
+{
+    mbedtls_ssl_context *ssl;
+    mbedtls_net_context *net;
+} io_ctx_t;
+
+void my_debug( void *ctx, int level,
+               const char *file, int line,
+               const char *str );
+
+mbedtls_time_t dummy_constant_time( mbedtls_time_t* time );
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+/* If MBEDTLS_TEST_USE_PSA_CRYPTO_RNG is defined, the SSL test programs will use
+ * mbedtls_psa_get_random() rather than entropy+DRBG as a random generator.
+ *
+ * The constraints are:
+ * - Without the entropy module, the PSA RNG is the only option.
+ * - Without at least one of the DRBG modules, the PSA RNG is the only option.
+ * - The PSA RNG does not support explicit seeding, so it is incompatible with
+ *   the reproducible mode used by test programs.
+ * - For good overall test coverage, there should be at least one configuration
+ *   where the test programs use the PSA RNG while the PSA RNG is itself based
+ *   on entropy+DRBG, and at least one configuration where the test programs
+ *   do not use the PSA RNG even though it's there.
+ *
+ * A simple choice that meets the constraints is to use the PSA RNG whenever
+ * MBEDTLS_USE_PSA_CRYPTO is enabled. There's no real technical reason the
+ * choice to use the PSA RNG in the test programs and the choice to use
+ * PSA crypto when TLS code needs crypto have to be tied together, but it
+ * happens to be a good match. It's also a good match from an application
+ * perspective: either PSA is preferred for TLS (both for crypto and for
+ * random generation) or it isn't.
+ */
+#define MBEDTLS_TEST_USE_PSA_CRYPTO_RNG
+#endif
+
+/** A context for random number generation (RNG).
+ */
+typedef struct
+{
+#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
+    unsigned char dummy;
+#else /* MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+    mbedtls_entropy_context entropy;
+#if defined(MBEDTLS_CTR_DRBG_C)
+    mbedtls_ctr_drbg_context drbg;
+#elif defined(MBEDTLS_HMAC_DRBG_C)
+    mbedtls_hmac_drbg_context drbg;
+#else
+#error "No DRBG available"
+#endif
+#endif /* MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
+} rng_context_t;
+
+/** Initialize the RNG.
+ *
+ * This function only initializes the memory used by the RNG context.
+ * Before using the RNG, it must be seeded with rng_seed().
+ */
+void rng_init( rng_context_t *rng );
+
+/* Seed the random number generator.
+ *
+ * \param rng           The RNG context to use. It must have been initialized
+ *                      with rng_init().
+ * \param reproducible  If zero, seed the RNG from entropy.
+ *                      If nonzero, use a fixed seed, so that the program
+ *                      will produce the same sequence of random numbers
+ *                      each time it is invoked.
+ * \param pers          A null-terminated string. Different values for this
+ *                      string cause the RNG to emit different output for
+ *                      the same seed.
+ *
+ * return 0 on success, a negative value on error.
+ */
+int rng_seed( rng_context_t *rng, int reproducible, const char *pers );
+
+/** Deinitialize the RNG. Free any embedded resource.
+ *
+ * \param rng           The RNG context to deinitialize. It must have been
+ *                      initialized with rng_init().
+ */
+void rng_free( rng_context_t *rng );
+
+/** Generate random data.
+ *
+ * This function is suitable for use as the \c f_rng argument to Mbed TLS
+ * library functions.
+ *
+ * \param p_rng         The random generator context. This must be a pointer to
+ *                      a #rng_context_t structure.
+ * \param output        The buffer to fill.
+ * \param output_len    The length of the buffer in bytes.
+ *
+ * \return              \c 0 on success.
+ * \return              An Mbed TLS error code on error.
+ */
+int rng_get( void *p_rng, unsigned char *output, size_t output_len );
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
+/* The test implementation of the PSA external RNG is insecure. When
+ * MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG is enabled, before using any PSA crypto
+ * function that makes use of an RNG, you must call
+ * mbedtls_test_enable_insecure_external_rng(). */
+#include <test/fake_external_rng_for_test.h>
+#endif
+
+#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
+int ca_callback( void *data, mbedtls_x509_crt const *child,
+                 mbedtls_x509_crt **candidates );
+#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
+
+/*
+ * Test recv/send functions that make sure each try returns
+ * WANT_READ/WANT_WRITE at least once before sucesseding
+ */
+int delayed_recv( void *ctx, unsigned char *buf, size_t len );
+int delayed_send( void *ctx, const unsigned char *buf, size_t len );
+
+/*
+ * Wait for an event from the underlying transport or the timer
+ * (Used in event-driven IO mode).
+ */
+int idle( mbedtls_net_context *fd,
+#if defined(MBEDTLS_TIMING_C)
+          mbedtls_timing_delay_context *timer,
+#endif
+          int idle_reason );
+
+#if defined(MBEDTLS_TEST_HOOKS)
+/** Initialize whatever test hooks are enabled by the compile-time
+ * configuration and make sense for the TLS test programs. */
+void test_hooks_init( void );
+
+/** Check if any test hooks detected a problem.
+ *
+ * If a problem was detected, it's ok for the calling program to keep going,
+ * but it should ultimately exit with an error status.
+ *
+ * \note When implementing a test hook that detects errors on its own
+ *       (as opposed to e.g. leaving the error for a memory sanitizer to
+ *       report), make sure to print a message to standard error either at
+ *       the time the problem is detected or during the execution of this
+ *       function. This function does not indicate what problem was detected,
+ *       so printing a message is the only way to provide feedback in the
+ *       logs of the calling program.
+ *
+ * \return Nonzero if a problem was detected.
+ *         \c 0 if no problem was detected.
+ */
+int test_hooks_failure_detected( void );
+
+/** Free any resources allocated for the sake of test hooks.
+ *
+ * Call this at the end of the program so that resource leak analyzers
+ * don't complain.
+ */
+void test_hooks_free( void );
+
+#endif /* !MBEDTLS_TEST_HOOKS */
+
+#endif /* MBEDTLS_SSL_TEST_IMPOSSIBLE conditions: else */
+#endif /* MBEDTLS_PROGRAMS_SSL_SSL_TEST_LIB_H */