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.

24 files changed, 4663 insertions, 0 deletions

diff --git a/lib/mbedtls-2.27.0/programs/pkey/CMakeLists.txt b/lib/mbedtls-2.27.0/programs/pkey/CMakeLists.txt
new file mode 100644
index 0000000..9c6fe7d
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/CMakeLists.txt
@@ -0,0 +1,39 @@
+set(executables_mbedtls
+    dh_client
+    dh_server
+)
+
+foreach(exe IN LISTS executables_mbedtls)
+    add_executable(${exe} ${exe}.c $<TARGET_OBJECTS:mbedtls_test>)
+    target_link_libraries(${exe} ${mbedtls_target})
+endforeach()
+
+set(executables_mbedcrypto
+    dh_genprime
+    ecdh_curve25519
+    ecdsa
+    gen_key
+    key_app
+    key_app_writer
+    mpi_demo
+    pk_encrypt
+    pk_decrypt
+    pk_sign
+    pk_verify
+    rsa_decrypt
+    rsa_encrypt
+    rsa_genkey
+    rsa_sign
+    rsa_sign_pss
+    rsa_verify
+    rsa_verify_pss
+)
+
+foreach(exe IN LISTS executables_mbedcrypto)
+    add_executable(${exe} ${exe}.c $<TARGET_OBJECTS:mbedtls_test>)
+    target_link_libraries(${exe} ${mbedcrypto_target})
+endforeach()
+
+install(TARGETS ${executables_mbedtls} ${executables_mbedcrypto}
+        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/pkey/dh_client.c b/lib/mbedtls-2.27.0/programs/pkey/dh_client.c
new file mode 100644
index 0000000..d6e4990
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/dh_client.c
@@ -0,0 +1,312 @@
+/*
+ *  Diffie-Hellman-Merkle key exchange (client side)
+ *
+ *  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_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_AES_C) && defined(MBEDTLS_DHM_C) && \
+    defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_NET_C) && \
+    defined(MBEDTLS_RSA_C) && defined(MBEDTLS_SHA256_C) && \
+    defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C) && \
+    defined(MBEDTLS_SHA1_C)
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/aes.h"
+#include "mbedtls/dhm.h"
+#include "mbedtls/rsa.h"
+#include "mbedtls/sha1.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <stdio.h>
+#include <string.h>
+#endif
+
+#define SERVER_NAME "localhost"
+#define SERVER_PORT "11999"
+
+#if !defined(MBEDTLS_AES_C) || !defined(MBEDTLS_DHM_C) ||     \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_NET_C) ||  \
+    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) ||    \
+    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \
+    !defined(MBEDTLS_SHA1_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_AES_C and/or MBEDTLS_DHM_C and/or MBEDTLS_ENTROPY_C "
+           "and/or MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
+           "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO and/or "
+           "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+
+int main( void )
+{
+    FILE *f;
+
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t n, buflen;
+    mbedtls_net_context server_fd;
+
+    unsigned char *p, *end;
+    unsigned char buf[2048];
+    unsigned char hash[32];
+    const char *pers = "dh_client";
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_rsa_context rsa;
+    mbedtls_dhm_context dhm;
+    mbedtls_aes_context aes;
+
+    mbedtls_net_init( &server_fd );
+    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_SHA256 );
+    mbedtls_dhm_init( &dhm );
+    mbedtls_aes_init( &aes );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    /*
+     * 1. Setup the RNG
+     */
+    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;
+    }
+
+    /*
+     * 2. Read the server's public RSA key
+     */
+    mbedtls_printf( "\n  . Reading public key from rsa_pub.txt" );
+    fflush( stdout );
+
+    if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not open rsa_pub.txt\n" \
+                "  ! Please run rsa_genkey first\n\n" );
+        goto exit;
+    }
+
+    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
+
+    if( ( ret = mbedtls_mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &rsa.E, 16, f ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n", ret );
+        fclose( f );
+        goto exit;
+    }
+
+    rsa.len = ( mbedtls_mpi_bitlen( &rsa.N ) + 7 ) >> 3;
+
+    fclose( f );
+
+    /*
+     * 3. Initiate the connection
+     */
+    mbedtls_printf( "\n  . 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;
+    }
+
+    /*
+     * 4a. First get the buffer length
+     */
+    mbedtls_printf( "\n  . Receiving the server's DH parameters" );
+    fflush( stdout );
+
+    memset( buf, 0, sizeof( buf ) );
+
+    if( ( ret = mbedtls_net_recv( &server_fd, buf, 2 ) ) != 2 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_recv returned %d\n\n", ret );
+        goto exit;
+    }
+
+    n = buflen = ( buf[0] << 8 ) | buf[1];
+    if( buflen < 1 || buflen > sizeof( buf ) )
+    {
+        mbedtls_printf( " failed\n  ! Got an invalid buffer length\n\n" );
+        goto exit;
+    }
+
+    /*
+     * 4b. Get the DHM parameters: P, G and Ys = G^Xs mod P
+     */
+    memset( buf, 0, sizeof( buf ) );
+
+    if( ( ret = mbedtls_net_recv( &server_fd, buf, n ) ) != (int) n )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_recv returned %d\n\n", ret );
+        goto exit;
+    }
+
+    p = buf, end = buf + buflen;
+
+    if( ( ret = mbedtls_dhm_read_params( &dhm, &p, end ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_dhm_read_params returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( dhm.len < 64 || dhm.len > 512 )
+    {
+        mbedtls_printf( " failed\n  ! Invalid DHM modulus size\n\n" );
+        goto exit;
+    }
+
+    /*
+     * 5. Check that the server's RSA signature matches
+     *    the SHA-256 hash of (P,G,Ys)
+     */
+    mbedtls_printf( "\n  . Verifying the server's RSA signature" );
+    fflush( stdout );
+
+    p += 2;
+
+    if( ( n = (size_t) ( end - p ) ) != rsa.len )
+    {
+        mbedtls_printf( " failed\n  ! Invalid RSA signature size\n\n" );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_sha1_ret( buf, (int)( p - 2 - buf ), hash ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_sha1_ret returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_rsa_pkcs1_verify( &rsa, NULL, NULL, MBEDTLS_RSA_PUBLIC,
+                                  MBEDTLS_MD_SHA256, 0, hash, p ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_verify returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /*
+     * 6. Send our public value: Yc = G ^ Xc mod P
+     */
+    mbedtls_printf( "\n  . Sending own public value to server" );
+    fflush( stdout );
+
+    n = dhm.len;
+    if( ( ret = mbedtls_dhm_make_public( &dhm, (int) dhm.len, buf, n,
+                                 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_dhm_make_public returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_net_send( &server_fd, buf, n ) ) != (int) n )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_send returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /*
+     * 7. Derive the shared secret: K = Ys ^ Xc mod P
+     */
+    mbedtls_printf( "\n  . Shared secret: " );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_dhm_calc_secret( &dhm, buf, sizeof( buf ), &n,
+                                 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_dhm_calc_secret returned %d\n\n", ret );
+        goto exit;
+    }
+
+    for( n = 0; n < 16; n++ )
+        mbedtls_printf( "%02x", buf[n] );
+
+    /*
+     * 8. Setup the AES-256 decryption key
+     *
+     * This is an overly simplified example; best practice is
+     * to hash the shared secret with a random value to derive
+     * the keying material for the encryption/decryption keys,
+     * IVs and MACs.
+     */
+    mbedtls_printf( "...\n  . Receiving and decrypting the ciphertext" );
+    fflush( stdout );
+
+    mbedtls_aes_setkey_dec( &aes, buf, 256 );
+
+    memset( buf, 0, sizeof( buf ) );
+
+    if( ( ret = mbedtls_net_recv( &server_fd, buf, 16 ) ) != 16 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_recv returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_aes_crypt_ecb( &aes, MBEDTLS_AES_DECRYPT, buf, buf );
+    buf[16] = '\0';
+    mbedtls_printf( "\n  . Plaintext is \"%s\"\n\n", (char *) buf );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    mbedtls_net_free( &server_fd );
+
+    mbedtls_aes_free( &aes );
+    mbedtls_rsa_free( &rsa );
+    mbedtls_dhm_free( &dhm );
+    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_AES_C && MBEDTLS_DHM_C && MBEDTLS_ENTROPY_C &&
+          MBEDTLS_NET_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
+          MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/dh_genprime.c b/lib/mbedtls-2.27.0/programs/pkey/dh_genprime.c
new file mode 100644
index 0000000..a481e32
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/dh_genprime.c
@@ -0,0 +1,201 @@
+/*
+ *  Diffie-Hellman-Merkle key exchange (prime generation)
+ *
+ *  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_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_ENTROPY_C) ||   \
+    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) ||     \
+    !defined(MBEDTLS_GENPRIME)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_FS_IO and/or MBEDTLS_CTR_DRBG_C and/or "
+           "MBEDTLS_GENPRIME not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/bignum.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#define USAGE \
+    "\n usage: dh_genprime param=<>...\n"                                   \
+    "\n acceprable parameters:\n"                                           \
+    "    bits=%%d           default: 2048\n"
+
+#define DFL_BITS    2048
+
+/*
+ * Note: G = 4 is always a quadratic residue mod P,
+ * so it is a generator of order Q (with P = 2*Q+1).
+ */
+#define GENERATOR "4"
+
+
+int main( int argc, char **argv )
+{
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_mpi G, P, Q;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    const char *pers = "dh_genprime";
+    FILE *fout;
+    int nbits = DFL_BITS;
+    int i;
+    char *p, *q;
+
+    mbedtls_mpi_init( &G ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+    mbedtls_entropy_init( &entropy );
+
+    if( argc == 0 )
+    {
+    usage:
+        mbedtls_printf( USAGE );
+        goto exit;
+    }
+
+    for( i = 1; i < argc; i++ )
+    {
+        p = argv[i];
+        if( ( q = strchr( p, '=' ) ) == NULL )
+            goto usage;
+        *q++ = '\0';
+
+        if( strcmp( p, "bits" ) == 0 )
+        {
+            nbits = atoi( q );
+            if( nbits < 0 || nbits > MBEDTLS_MPI_MAX_BITS )
+                goto usage;
+        }
+        else
+            goto usage;
+    }
+
+    if( ( ret = mbedtls_mpi_read_string( &G, 10, GENERATOR ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_string returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "  ! Generating large primes may take minutes!\n" );
+
+    mbedtls_printf( "\n  . 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  . Generating the modulus, please wait..." );
+    fflush( stdout );
+
+    /*
+     * This can take a long time...
+     */
+    if( ( ret = mbedtls_mpi_gen_prime( &P, nbits, 1,
+                               mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_gen_prime returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n  . Verifying that Q = (P-1)/2 is prime..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_mpi_sub_int( &Q, &P, 1 ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_sub_int returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_mpi_div_int( &Q, NULL, &Q, 2 ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_div_int returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_mpi_is_prime_ext( &Q, 50, mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_is_prime returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n  . Exporting the value in dh_prime.txt..." );
+    fflush( stdout );
+
+    if( ( fout = fopen( "dh_prime.txt", "wb+" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not create dh_prime.txt\n\n" );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_mpi_write_file( "P = ", &P, 16, fout ) != 0 ) ||
+        ( ret = mbedtls_mpi_write_file( "G = ", &G, 16, fout ) != 0 ) )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_write_file returned %d\n\n", ret );
+        fclose( fout );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n\n" );
+    fclose( fout );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    mbedtls_mpi_free( &G ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
+    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_FS_IO &&
+          MBEDTLS_CTR_DRBG_C && MBEDTLS_GENPRIME */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/dh_prime.txt b/lib/mbedtls-2.27.0/programs/pkey/dh_prime.txt
new file mode 100644
index 0000000..de0c281
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/dh_prime.txt
@@ -0,0 +1,2 @@
+P = FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3BE39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF6955817183995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF
+G = 02
diff --git a/lib/mbedtls-2.27.0/programs/pkey/dh_server.c b/lib/mbedtls-2.27.0/programs/pkey/dh_server.c
new file mode 100644
index 0000000..dccf095
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/dh_server.c
@@ -0,0 +1,335 @@
+/*
+ *  Diffie-Hellman-Merkle key exchange (server side)
+ *
+ *  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_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_AES_C) && defined(MBEDTLS_DHM_C) && \
+    defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_NET_C) && \
+    defined(MBEDTLS_RSA_C) && defined(MBEDTLS_SHA256_C) && \
+    defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C) && \
+    defined(MBEDTLS_SHA1_C)
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/aes.h"
+#include "mbedtls/dhm.h"
+#include "mbedtls/rsa.h"
+#include "mbedtls/sha1.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <stdio.h>
+#include <string.h>
+#endif
+
+#define SERVER_PORT "11999"
+#define PLAINTEXT "==Hello there!=="
+
+#if !defined(MBEDTLS_AES_C) || !defined(MBEDTLS_DHM_C) ||     \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_NET_C) ||  \
+    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) ||    \
+    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \
+    !defined(MBEDTLS_SHA1_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_AES_C and/or MBEDTLS_DHM_C and/or MBEDTLS_ENTROPY_C "
+           "and/or MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
+           "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO and/or "
+           "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+
+int main( void )
+{
+    FILE *f;
+
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t n, buflen;
+    mbedtls_net_context listen_fd, client_fd;
+
+    unsigned char buf[2048];
+    unsigned char hash[32];
+    unsigned char buf2[2];
+    const char *pers = "dh_server";
+
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_rsa_context rsa;
+    mbedtls_dhm_context dhm;
+    mbedtls_aes_context aes;
+
+    mbedtls_mpi N, P, Q, D, E;
+
+    mbedtls_net_init( &listen_fd );
+    mbedtls_net_init( &client_fd );
+    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_SHA256 );
+    mbedtls_dhm_init( &dhm );
+    mbedtls_aes_init( &aes );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
+    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E );
+
+    /*
+     * 1. Setup the RNG
+     */
+    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;
+    }
+
+    /*
+     * 2a. Read the server's private RSA key
+     */
+    mbedtls_printf( "\n  . Reading private key from rsa_priv.txt" );
+    fflush( stdout );
+
+    if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not open rsa_priv.txt\n" \
+                "  ! Please run rsa_genkey first\n\n" );
+        goto exit;
+    }
+
+    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
+
+    if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &D , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &P , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &Q , 16, f ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n",
+                        ret );
+        fclose( f );
+        goto exit;
+    }
+    fclose( f );
+
+    if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_import returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_complete returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+
+    /*
+     * 2b. Get the DHM modulus and generator
+     */
+    mbedtls_printf( "\n  . Reading DH parameters from dh_prime.txt" );
+    fflush( stdout );
+
+    if( ( f = fopen( "dh_prime.txt", "rb" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not open dh_prime.txt\n" \
+                "  ! Please run dh_genprime first\n\n" );
+        goto exit;
+    }
+
+    if( mbedtls_mpi_read_file( &dhm.P, 16, f ) != 0 ||
+        mbedtls_mpi_read_file( &dhm.G, 16, f ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Invalid DH parameter file\n\n" );
+        fclose( f );
+        goto exit;
+    }
+
+    fclose( f );
+
+    /*
+     * 3. Wait for a client to connect
+     */
+    mbedtls_printf( "\n  . Waiting for a remote connection" );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_net_bind( &listen_fd, NULL, SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_bind returned %d\n\n", ret );
+        goto exit;
+    }
+
+    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;
+    }
+
+    /*
+     * 4. Setup the DH parameters (P,G,Ys)
+     */
+    mbedtls_printf( "\n  . Sending the server's DH parameters" );
+    fflush( stdout );
+
+    memset( buf, 0, sizeof( buf ) );
+
+    if( ( ret = mbedtls_dhm_make_params( &dhm, (int) mbedtls_mpi_size( &dhm.P ), buf, &n,
+                                 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_dhm_make_params returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /*
+     * 5. Sign the parameters and send them
+     */
+    if( ( ret = mbedtls_sha1_ret( buf, n, hash ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_sha1_ret returned %d\n\n", ret );
+        goto exit;
+    }
+
+    buf[n    ] = (unsigned char)( rsa.len >> 8 );
+    buf[n + 1] = (unsigned char)( rsa.len      );
+
+    if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256,
+                                0, hash, buf + n + 2 ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_sign returned %d\n\n", ret );
+        goto exit;
+    }
+
+    buflen = n + 2 + rsa.len;
+    buf2[0] = (unsigned char)( buflen >> 8 );
+    buf2[1] = (unsigned char)( buflen      );
+
+    if( ( ret = mbedtls_net_send( &client_fd, buf2, 2 ) ) != 2 ||
+        ( ret = mbedtls_net_send( &client_fd, buf, buflen ) ) != (int) buflen )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_send returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /*
+     * 6. Get the client's public value: Yc = G ^ Xc mod P
+     */
+    mbedtls_printf( "\n  . Receiving the client's public value" );
+    fflush( stdout );
+
+    memset( buf, 0, sizeof( buf ) );
+
+    n = dhm.len;
+    if( ( ret = mbedtls_net_recv( &client_fd, buf, n ) ) != (int) n )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_recv returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_dhm_read_public( &dhm, buf, dhm.len ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_dhm_read_public returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /*
+     * 7. Derive the shared secret: K = Ys ^ Xc mod P
+     */
+    mbedtls_printf( "\n  . Shared secret: " );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_dhm_calc_secret( &dhm, buf, sizeof( buf ), &n,
+                                 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_dhm_calc_secret returned %d\n\n", ret );
+        goto exit;
+    }
+
+    for( n = 0; n < 16; n++ )
+        mbedtls_printf( "%02x", buf[n] );
+
+    /*
+     * 8. Setup the AES-256 encryption key
+     *
+     * This is an overly simplified example; best practice is
+     * to hash the shared secret with a random value to derive
+     * the keying material for the encryption/decryption keys
+     * and MACs.
+     */
+    mbedtls_printf( "...\n  . Encrypting and sending the ciphertext" );
+    fflush( stdout );
+
+    mbedtls_aes_setkey_enc( &aes, buf, 256 );
+    memcpy( buf, PLAINTEXT, 16 );
+    mbedtls_aes_crypt_ecb( &aes, MBEDTLS_AES_ENCRYPT, buf, buf );
+
+    if( ( ret = mbedtls_net_send( &client_fd, buf, 16 ) ) != 16 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_net_send returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n\n" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
+    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E );
+
+    mbedtls_net_free( &client_fd );
+    mbedtls_net_free( &listen_fd );
+
+    mbedtls_aes_free( &aes );
+    mbedtls_rsa_free( &rsa );
+    mbedtls_dhm_free( &dhm );
+    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_AES_C && MBEDTLS_DHM_C && MBEDTLS_ENTROPY_C &&
+          MBEDTLS_NET_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
+          MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/ecdh_curve25519.c b/lib/mbedtls-2.27.0/programs/pkey/ecdh_curve25519.c
new file mode 100644
index 0000000..67f1363
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/ecdh_curve25519.c
@@ -0,0 +1,242 @@
+/*
+ *  Example ECDHE with Curve25519 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_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
+
+#if !defined(MBEDTLS_ECDH_C) || !defined(MBEDTLS_ECDH_LEGACY_CONTEXT) || \
+    !defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) || \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf( "MBEDTLS_ECDH_C and/or MBEDTLS_ECDH_LEGACY_CONTEXT and/or "
+                    "MBEDTLS_ECP_DP_CURVE25519_ENABLED and/or "
+                    "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C "
+                    "not defined\n" );
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/ecdh.h"
+
+
+int main( int argc, char *argv[] )
+{
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_ecdh_context ctx_cli, ctx_srv;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    unsigned char cli_to_srv[32], srv_to_cli[32];
+    const char pers[] = "ecdh";
+    ((void) argc);
+    ((void) argv);
+
+    mbedtls_ecdh_init( &ctx_cli );
+    mbedtls_ecdh_init( &ctx_srv );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    /*
+     * Initialize random number generation
+     */
+    mbedtls_printf( "  . 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,
+                               sizeof pers ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * Client: initialize context and generate keypair
+     */
+    mbedtls_printf( "  . Setting up client context..." );
+    fflush( stdout );
+
+    ret = mbedtls_ecp_group_load( &ctx_cli.grp, MBEDTLS_ECP_DP_CURVE25519 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecp_group_load returned %d\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_ecdh_gen_public( &ctx_cli.grp, &ctx_cli.d, &ctx_cli.Q,
+                                   mbedtls_ctr_drbg_random, &ctr_drbg );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecdh_gen_public returned %d\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_mpi_write_binary( &ctx_cli.Q.X, cli_to_srv, 32 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_write_binary returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * Server: initialize context and generate keypair
+     */
+    mbedtls_printf( "  . Setting up server context..." );
+    fflush( stdout );
+
+    ret = mbedtls_ecp_group_load( &ctx_srv.grp, MBEDTLS_ECP_DP_CURVE25519 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecp_group_load returned %d\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_ecdh_gen_public( &ctx_srv.grp, &ctx_srv.d, &ctx_srv.Q,
+                                   mbedtls_ctr_drbg_random, &ctr_drbg );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecdh_gen_public returned %d\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_mpi_write_binary( &ctx_srv.Q.X, srv_to_cli, 32 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_write_binary returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * Server: read peer's key and generate shared secret
+     */
+    mbedtls_printf( "  . Server reading client key and computing secret..." );
+    fflush( stdout );
+
+    ret = mbedtls_mpi_lset( &ctx_srv.Qp.Z, 1 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_lset returned %d\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_mpi_read_binary( &ctx_srv.Qp.X, cli_to_srv, 32 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_binary returned %d\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_ecdh_compute_shared( &ctx_srv.grp, &ctx_srv.z,
+                                       &ctx_srv.Qp, &ctx_srv.d,
+                                       mbedtls_ctr_drbg_random, &ctr_drbg );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecdh_compute_shared returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * Client: read peer's key and generate shared secret
+     */
+    mbedtls_printf( "  . Client reading server key and computing secret..." );
+    fflush( stdout );
+
+    ret = mbedtls_mpi_lset( &ctx_cli.Qp.Z, 1 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_lset returned %d\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_mpi_read_binary( &ctx_cli.Qp.X, srv_to_cli, 32 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_binary returned %d\n", ret );
+        goto exit;
+    }
+
+    ret = mbedtls_ecdh_compute_shared( &ctx_cli.grp, &ctx_cli.z,
+                                       &ctx_cli.Qp, &ctx_cli.d,
+                                       mbedtls_ctr_drbg_random, &ctr_drbg );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecdh_compute_shared returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    /*
+     * Verification: are the computed secrets equal?
+     */
+    mbedtls_printf( "  . Checking if both computed secrets are equal..." );
+    fflush( stdout );
+
+    ret = mbedtls_mpi_cmp_mpi( &ctx_cli.z, &ctx_srv.z );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecdh_compute_shared returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+#if defined(_WIN32)
+    mbedtls_printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    mbedtls_ecdh_free( &ctx_srv );
+    mbedtls_ecdh_free( &ctx_cli );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+    mbedtls_exit( exit_code );
+}
+#endif /* MBEDTLS_ECDH_C && MBEDTLS_ECP_DP_CURVE25519_ENABLED &&
+          MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/ecdsa.c b/lib/mbedtls-2.27.0/programs/pkey/ecdsa.c
new file mode 100644
index 0000000..1bbf826
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/ecdsa.c
@@ -0,0 +1,252 @@
+/*
+ *  Example ECDSA 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_exit            exit
+#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#endif /* MBEDTLS_PLATFORM_C */
+
+#if defined(MBEDTLS_ECDSA_C) && \
+    defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_CTR_DRBG_C)
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/ecdsa.h"
+#include "mbedtls/sha256.h"
+
+#include <string.h>
+#endif
+
+/*
+ * Uncomment to show key and signature details
+ */
+#define VERBOSE
+
+/*
+ * Uncomment to force use of a specific curve
+ */
+#define ECPARAMS    MBEDTLS_ECP_DP_SECP192R1
+
+#if !defined(ECPARAMS)
+#define ECPARAMS    mbedtls_ecp_curve_list()->grp_id
+#endif
+
+#if !defined(MBEDTLS_ECDSA_C) || !defined(MBEDTLS_SHA256_C) || \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_ECDSA_C and/or MBEDTLS_SHA256_C and/or "
+           "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C not defined\n");
+    mbedtls_exit( 0 );
+}
+#else
+#if defined(VERBOSE)
+static void dump_buf( const char *title, unsigned char *buf, size_t len )
+{
+    size_t i;
+
+    mbedtls_printf( "%s", title );
+    for( i = 0; i < len; i++ )
+        mbedtls_printf("%c%c", "0123456789ABCDEF" [buf[i] / 16],
+                       "0123456789ABCDEF" [buf[i] % 16] );
+    mbedtls_printf( "\n" );
+}
+
+static void dump_pubkey( const char *title, mbedtls_ecdsa_context *key )
+{
+    unsigned char buf[300];
+    size_t len;
+
+    if( mbedtls_ecp_point_write_binary( &key->grp, &key->Q,
+                MBEDTLS_ECP_PF_UNCOMPRESSED, &len, buf, sizeof buf ) != 0 )
+    {
+        mbedtls_printf("internal error\n");
+        return;
+    }
+
+    dump_buf( title, buf, len );
+}
+#else
+#define dump_buf( a, b, c )
+#define dump_pubkey( a, b )
+#endif
+
+
+int main( int argc, char *argv[] )
+{
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_ecdsa_context ctx_sign, ctx_verify;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    unsigned char message[100];
+    unsigned char hash[32];
+    unsigned char sig[MBEDTLS_ECDSA_MAX_LEN];
+    size_t sig_len;
+    const char *pers = "ecdsa";
+    ((void) argv);
+
+    mbedtls_ecdsa_init( &ctx_sign );
+    mbedtls_ecdsa_init( &ctx_verify );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    memset( sig, 0, sizeof( sig ) );
+    memset( message, 0x25, sizeof( message ) );
+
+    if( argc != 1 )
+    {
+        mbedtls_printf( "usage: ecdsa\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    /*
+     * Generate a key pair for signing
+     */
+    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  . Generating key pair..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ecdsa_genkey( &ctx_sign, ECPARAMS,
+                              mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecdsa_genkey returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok (key size: %d bits)\n", (int) ctx_sign.grp.pbits );
+
+    dump_pubkey( "  + Public key: ", &ctx_sign );
+
+    /*
+     * Compute message hash
+     */
+    mbedtls_printf( "  . Computing message hash..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_sha256_ret( message, sizeof( message ), hash, 0 ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_sha256_ret returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    dump_buf( "  + Hash: ", hash, sizeof( hash ) );
+
+    /*
+     * Sign message hash
+     */
+    mbedtls_printf( "  . Signing message hash..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ecdsa_write_signature( &ctx_sign, MBEDTLS_MD_SHA256,
+                                       hash, sizeof( hash ),
+                                       sig, &sig_len,
+                                       mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecdsa_write_signature returned %d\n", ret );
+        goto exit;
+    }
+    mbedtls_printf( " ok (signature length = %u)\n", (unsigned int) sig_len );
+
+    dump_buf( "  + Signature: ", sig, sig_len );
+
+    /*
+     * Transfer public information to verifying context
+     *
+     * We could use the same context for verification and signatures, but we
+     * chose to use a new one in order to make it clear that the verifying
+     * context only needs the public key (Q), and not the private key (d).
+     */
+    mbedtls_printf( "  . Preparing verification context..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ecp_group_copy( &ctx_verify.grp, &ctx_sign.grp ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecp_group_copy returned %d\n", ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_ecp_copy( &ctx_verify.Q, &ctx_sign.Q ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecp_copy returned %d\n", ret );
+        goto exit;
+    }
+
+    /*
+     * Verify signature
+     */
+    mbedtls_printf( " ok\n  . Verifying signature..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_ecdsa_read_signature( &ctx_verify,
+                                      hash, sizeof( hash ),
+                                      sig, sig_len ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ecdsa_read_signature returned %d\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+#if defined(_WIN32)
+    mbedtls_printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    mbedtls_ecdsa_free( &ctx_verify );
+    mbedtls_ecdsa_free( &ctx_sign );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+    mbedtls_exit( exit_code );
+}
+#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
+          ECPARAMS */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/gen_key.c b/lib/mbedtls-2.27.0/programs/pkey/gen_key.c
new file mode 100644
index 0000000..63cc11e
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/gen_key.c
@@ -0,0 +1,450 @@
+/*
+ *  Key generation application
+ *
+ *  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 /* MBEDTLS_PLATFORM_C */
+
+#if defined(MBEDTLS_PK_WRITE_C) && defined(MBEDTLS_FS_IO) && \
+    defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_CTR_DRBG_C)
+#include "mbedtls/error.h"
+#include "mbedtls/pk.h"
+#include "mbedtls/ecdsa.h"
+#include "mbedtls/rsa.h"
+#include "mbedtls/error.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if !defined(_WIN32)
+#include <unistd.h>
+
+#define DEV_RANDOM_THRESHOLD        32
+
+int dev_random_entropy_poll( void *data, unsigned char *output,
+                             size_t len, size_t *olen )
+{
+    FILE *file;
+    size_t ret, left = len;
+    unsigned char *p = output;
+    ((void) data);
+
+    *olen = 0;
+
+    file = fopen( "/dev/random", "rb" );
+    if( file == NULL )
+        return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
+
+    while( left > 0 )
+    {
+        /* /dev/random can return much less than requested. If so, try again */
+        ret = fread( p, 1, left, file );
+        if( ret == 0 && ferror( file ) )
+        {
+            fclose( file );
+            return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
+        }
+
+        p += ret;
+        left -= ret;
+        sleep( 1 );
+    }
+    fclose( file );
+    *olen = len;
+
+    return( 0 );
+}
+#endif /* !_WIN32 */
+#endif
+
+#if defined(MBEDTLS_ECP_C)
+#define DFL_EC_CURVE            mbedtls_ecp_curve_list()->grp_id
+#else
+#define DFL_EC_CURVE            0
+#endif
+
+#if !defined(_WIN32) && defined(MBEDTLS_FS_IO)
+#define USAGE_DEV_RANDOM \
+    "    use_dev_random=0|1    default: 0\n"
+#else
+#define USAGE_DEV_RANDOM ""
+#endif /* !_WIN32 && MBEDTLS_FS_IO */
+
+#define FORMAT_PEM              0
+#define FORMAT_DER              1
+
+#define DFL_TYPE                MBEDTLS_PK_RSA
+#define DFL_RSA_KEYSIZE         4096
+#define DFL_FILENAME            "keyfile.key"
+#define DFL_FORMAT              FORMAT_PEM
+#define DFL_USE_DEV_RANDOM      0
+
+#define USAGE \
+    "\n usage: gen_key param=<>...\n"                   \
+    "\n acceptable parameters:\n"                       \
+    "    type=rsa|ec           default: rsa\n"          \
+    "    rsa_keysize=%%d        default: 4096\n"        \
+    "    ec_curve=%%s           see below\n"            \
+    "    filename=%%s           default: keyfile.key\n" \
+    "    format=pem|der        default: pem\n"          \
+    USAGE_DEV_RANDOM                                    \
+    "\n"
+
+#if !defined(MBEDTLS_PK_WRITE_C) || !defined(MBEDTLS_PEM_WRITE_C) || \
+    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \
+    !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf( "MBEDTLS_PK_WRITE_C and/or MBEDTLS_FS_IO and/or "
+            "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
+            "MBEDTLS_PEM_WRITE_C"
+            "not defined.\n" );
+    mbedtls_exit( 0 );
+}
+#else
+
+
+/*
+ * global options
+ */
+struct options
+{
+    int type;                   /* the type of key to generate          */
+    int rsa_keysize;            /* length of key in bits                */
+    int ec_curve;               /* curve identifier for EC keys         */
+    const char *filename;       /* filename of the key file             */
+    int format;                 /* the output format to use             */
+    int use_dev_random;         /* use /dev/random as entropy source    */
+} opt;
+
+static int write_private_key( mbedtls_pk_context *key, const char *output_file )
+{
+    int ret;
+    FILE *f;
+    unsigned char output_buf[16000];
+    unsigned char *c = output_buf;
+    size_t len = 0;
+
+    memset(output_buf, 0, 16000);
+    if( opt.format == FORMAT_PEM )
+    {
+        if( ( ret = mbedtls_pk_write_key_pem( key, output_buf, 16000 ) ) != 0 )
+            return( ret );
+
+        len = strlen( (char *) output_buf );
+    }
+    else
+    {
+        if( ( ret = mbedtls_pk_write_key_der( key, output_buf, 16000 ) ) < 0 )
+            return( ret );
+
+        len = ret;
+        c = output_buf + sizeof(output_buf) - len;
+    }
+
+    if( ( f = fopen( output_file, "wb" ) ) == NULL )
+        return( -1 );
+
+    if( fwrite( c, 1, len, f ) != len )
+    {
+        fclose( f );
+        return( -1 );
+    }
+
+    fclose( f );
+
+    return( 0 );
+}
+
+int main( int argc, char *argv[] )
+{
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_pk_context key;
+    char buf[1024];
+    int i;
+    char *p, *q;
+    mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    const char *pers = "gen_key";
+#if defined(MBEDTLS_ECP_C)
+    const mbedtls_ecp_curve_info *curve_info;
+#endif
+
+    /*
+     * Set to sane values
+     */
+
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
+    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
+    mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
+
+    mbedtls_pk_init( &key );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+    memset( buf, 0, sizeof( buf ) );
+
+    if( argc == 0 )
+    {
+    usage:
+        mbedtls_printf( USAGE );
+#if defined(MBEDTLS_ECP_C)
+        mbedtls_printf( " available ec_curve values:\n" );
+        curve_info = mbedtls_ecp_curve_list();
+        mbedtls_printf( "    %s (default)\n", curve_info->name );
+        while( ( ++curve_info )->name != NULL )
+            mbedtls_printf( "    %s\n", curve_info->name );
+#endif /* MBEDTLS_ECP_C */
+        goto exit;
+    }
+
+    opt.type                = DFL_TYPE;
+    opt.rsa_keysize         = DFL_RSA_KEYSIZE;
+    opt.ec_curve            = DFL_EC_CURVE;
+    opt.filename            = DFL_FILENAME;
+    opt.format              = DFL_FORMAT;
+    opt.use_dev_random      = DFL_USE_DEV_RANDOM;
+
+    for( i = 1; i < argc; i++ )
+    {
+        p = argv[i];
+        if( ( q = strchr( p, '=' ) ) == NULL )
+            goto usage;
+        *q++ = '\0';
+
+        if( strcmp( p, "type" ) == 0 )
+        {
+            if( strcmp( q, "rsa" ) == 0 )
+                opt.type = MBEDTLS_PK_RSA;
+            else if( strcmp( q, "ec" ) == 0 )
+                opt.type = MBEDTLS_PK_ECKEY;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "format" ) == 0 )
+        {
+            if( strcmp( q, "pem" ) == 0 )
+                opt.format = FORMAT_PEM;
+            else if( strcmp( q, "der" ) == 0 )
+                opt.format = FORMAT_DER;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "rsa_keysize" ) == 0 )
+        {
+            opt.rsa_keysize = atoi( q );
+            if( opt.rsa_keysize < 1024 ||
+                opt.rsa_keysize > MBEDTLS_MPI_MAX_BITS )
+                goto usage;
+        }
+#if defined(MBEDTLS_ECP_C)
+        else if( strcmp( p, "ec_curve" ) == 0 )
+        {
+            if( ( curve_info = mbedtls_ecp_curve_info_from_name( q ) ) == NULL )
+                goto usage;
+            opt.ec_curve = curve_info->grp_id;
+        }
+#endif
+        else if( strcmp( p, "filename" ) == 0 )
+            opt.filename = q;
+        else if( strcmp( p, "use_dev_random" ) == 0 )
+        {
+            opt.use_dev_random = atoi( q );
+            if( opt.use_dev_random < 0 || opt.use_dev_random > 1 )
+                goto usage;
+        }
+        else
+            goto usage;
+    }
+
+    mbedtls_printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    mbedtls_entropy_init( &entropy );
+#if !defined(_WIN32) && defined(MBEDTLS_FS_IO)
+    if( opt.use_dev_random )
+    {
+        if( ( ret = mbedtls_entropy_add_source( &entropy, dev_random_entropy_poll,
+                                        NULL, DEV_RANDOM_THRESHOLD,
+                                        MBEDTLS_ENTROPY_SOURCE_STRONG ) ) != 0 )
+        {
+            mbedtls_printf( " failed\n  ! mbedtls_entropy_add_source returned -0x%04x\n", (unsigned int) -ret );
+            goto exit;
+        }
+
+        mbedtls_printf("\n    Using /dev/random, so can take a long time! " );
+        fflush( stdout );
+    }
+#endif /* !_WIN32 && MBEDTLS_FS_IO */
+
+    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 -0x%04x\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    /*
+     * 1.1. Generate the key
+     */
+    mbedtls_printf( "\n  . Generating the private key ..." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_pk_setup( &key,
+            mbedtls_pk_info_from_type( (mbedtls_pk_type_t) opt.type ) ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  !  mbedtls_pk_setup returned -0x%04x", (unsigned int) -ret );
+        goto exit;
+    }
+
+#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
+    if( opt.type == MBEDTLS_PK_RSA )
+    {
+        ret = mbedtls_rsa_gen_key( mbedtls_pk_rsa( key ), mbedtls_ctr_drbg_random, &ctr_drbg,
+                                   opt.rsa_keysize, 65537 );
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_rsa_gen_key returned -0x%04x", (unsigned int) -ret );
+            goto exit;
+        }
+    }
+    else
+#endif /* MBEDTLS_RSA_C */
+#if defined(MBEDTLS_ECP_C)
+    if( opt.type == MBEDTLS_PK_ECKEY )
+    {
+        ret = mbedtls_ecp_gen_key( (mbedtls_ecp_group_id) opt.ec_curve,
+                                   mbedtls_pk_ec( key ),
+                                   mbedtls_ctr_drbg_random, &ctr_drbg );
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_ecp_gen_key returned -0x%04x", (unsigned int) -ret );
+            goto exit;
+        }
+    }
+    else
+#endif /* MBEDTLS_ECP_C */
+    {
+        mbedtls_printf( " failed\n  !  key type not supported\n" );
+        goto exit;
+    }
+
+    /*
+     * 1.2 Print the key
+     */
+    mbedtls_printf( " ok\n  . Key information:\n" );
+
+#if defined(MBEDTLS_RSA_C)
+    if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_RSA )
+    {
+        mbedtls_rsa_context *rsa = mbedtls_pk_rsa( key );
+
+        if( ( ret = mbedtls_rsa_export    ( rsa, &N, &P, &Q, &D, &E ) ) != 0 ||
+            ( ret = mbedtls_rsa_export_crt( rsa, &DP, &DQ, &QP ) )      != 0 )
+        {
+            mbedtls_printf( " failed\n  ! could not export RSA parameters\n\n" );
+            goto exit;
+        }
+
+        mbedtls_mpi_write_file( "N:  ",  &N,  16, NULL );
+        mbedtls_mpi_write_file( "E:  ",  &E,  16, NULL );
+        mbedtls_mpi_write_file( "D:  ",  &D,  16, NULL );
+        mbedtls_mpi_write_file( "P:  ",  &P,  16, NULL );
+        mbedtls_mpi_write_file( "Q:  ",  &Q,  16, NULL );
+        mbedtls_mpi_write_file( "DP: ",  &DP, 16, NULL );
+        mbedtls_mpi_write_file( "DQ:  ", &DQ, 16, NULL );
+        mbedtls_mpi_write_file( "QP:  ", &QP, 16, NULL );
+    }
+    else
+#endif
+#if defined(MBEDTLS_ECP_C)
+    if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_ECKEY )
+    {
+        mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( key );
+        mbedtls_printf( "curve: %s\n",
+                mbedtls_ecp_curve_info_from_grp_id( ecp->grp.id )->name );
+        mbedtls_mpi_write_file( "X_Q:   ", &ecp->Q.X, 16, NULL );
+        mbedtls_mpi_write_file( "Y_Q:   ", &ecp->Q.Y, 16, NULL );
+        mbedtls_mpi_write_file( "D:     ", &ecp->d  , 16, NULL );
+    }
+    else
+#endif
+        mbedtls_printf("  ! key type not supported\n");
+
+    /*
+     * 1.3 Export key
+     */
+    mbedtls_printf( "  . Writing key to file..." );
+
+    if( ( ret = write_private_key( &key, opt.filename ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n" );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
+    {
+#ifdef MBEDTLS_ERROR_C
+        mbedtls_strerror( ret, buf, sizeof( buf ) );
+        mbedtls_printf( " - %s\n", buf );
+#else
+        mbedtls_printf("\n");
+#endif
+    }
+
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
+    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
+    mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
+
+    mbedtls_pk_free( &key );
+    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_PK_WRITE_C && MBEDTLS_PEM_WRITE_C && MBEDTLS_FS_IO &&
+        * MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/key_app.c b/lib/mbedtls-2.27.0/programs/pkey/key_app.c
new file mode 100644
index 0000000..7f39e5c
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/key_app.c
@@ -0,0 +1,314 @@
+/*
+ *  Key reading application
+ *
+ *  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 /* MBEDTLS_PLATFORM_C */
+
+#if defined(MBEDTLS_BIGNUM_C) && \
+    defined(MBEDTLS_PK_PARSE_C) && defined(MBEDTLS_FS_IO)
+#include "mbedtls/error.h"
+#include "mbedtls/rsa.h"
+#include "mbedtls/pk.h"
+
+#include <string.h>
+#endif
+
+#define MODE_NONE               0
+#define MODE_PRIVATE            1
+#define MODE_PUBLIC             2
+
+#define DFL_MODE                MODE_NONE
+#define DFL_FILENAME            "keyfile.key"
+#define DFL_PASSWORD            ""
+#define DFL_PASSWORD_FILE       ""
+#define DFL_DEBUG_LEVEL         0
+
+#define USAGE \
+    "\n usage: key_app param=<>...\n"                   \
+    "\n acceptable parameters:\n"                       \
+    "    mode=private|public default: none\n"           \
+    "    filename=%%s         default: keyfile.key\n"   \
+    "    password=%%s         default: \"\"\n"          \
+    "    password_file=%%s    default: \"\"\n"          \
+    "\n"
+
+#if !defined(MBEDTLS_BIGNUM_C) ||                                  \
+    !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or "
+           "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+
+/*
+ * global options
+ */
+struct options
+{
+    int mode;                   /* the mode to run the application in   */
+    const char *filename;       /* filename of the key file             */
+    const char *password;       /* password for the private key         */
+    const char *password_file;  /* password_file for the private key    */
+} opt;
+
+int main( int argc, char *argv[] )
+{
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    char buf[1024];
+    int i;
+    char *p, *q;
+
+    mbedtls_pk_context pk;
+    mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
+
+    /*
+     * Set to sane values
+     */
+    mbedtls_pk_init( &pk );
+    memset( buf, 0, sizeof(buf) );
+
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
+    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
+    mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
+
+    if( argc == 0 )
+    {
+    usage:
+        mbedtls_printf( USAGE );
+        goto cleanup;
+    }
+
+    opt.mode                = DFL_MODE;
+    opt.filename            = DFL_FILENAME;
+    opt.password            = DFL_PASSWORD;
+    opt.password_file       = DFL_PASSWORD_FILE;
+
+    for( i = 1; i < argc; i++ )
+    {
+        p = argv[i];
+        if( ( q = strchr( p, '=' ) ) == NULL )
+            goto usage;
+        *q++ = '\0';
+
+        if( strcmp( p, "mode" ) == 0 )
+        {
+            if( strcmp( q, "private" ) == 0 )
+                opt.mode = MODE_PRIVATE;
+            else if( strcmp( q, "public" ) == 0 )
+                opt.mode = MODE_PUBLIC;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "filename" ) == 0 )
+            opt.filename = q;
+        else if( strcmp( p, "password" ) == 0 )
+            opt.password = q;
+        else if( strcmp( p, "password_file" ) == 0 )
+            opt.password_file = q;
+        else
+            goto usage;
+    }
+
+    if( opt.mode == MODE_PRIVATE )
+    {
+        if( strlen( opt.password ) && strlen( opt.password_file ) )
+        {
+            mbedtls_printf( "Error: cannot have both password and password_file\n" );
+            goto usage;
+        }
+
+        if( strlen( opt.password_file ) )
+        {
+            FILE *f;
+
+            mbedtls_printf( "\n  . Loading the password file ..." );
+            if( ( f = fopen( opt.password_file, "rb" ) ) == NULL )
+            {
+                mbedtls_printf( " failed\n  !  fopen returned NULL\n" );
+                goto cleanup;
+            }
+            if( fgets( buf, sizeof(buf), f ) == NULL )
+            {
+                fclose( f );
+                mbedtls_printf( "Error: fgets() failed to retrieve password\n" );
+                goto cleanup;
+            }
+            fclose( f );
+
+            i = (int) strlen( buf );
+            if( buf[i - 1] == '\n' ) buf[i - 1] = '\0';
+            if( buf[i - 2] == '\r' ) buf[i - 2] = '\0';
+            opt.password = buf;
+        }
+
+        /*
+         * 1.1. Load the key
+         */
+        mbedtls_printf( "\n  . Loading the private key ..." );
+        fflush( stdout );
+
+        ret = mbedtls_pk_parse_keyfile( &pk, opt.filename, opt.password );
+
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_pk_parse_keyfile returned -0x%04x\n", (unsigned int) -ret );
+            goto cleanup;
+        }
+
+        mbedtls_printf( " ok\n" );
+
+        /*
+         * 1.2 Print the key
+         */
+        mbedtls_printf( "  . Key information    ...\n" );
+#if defined(MBEDTLS_RSA_C)
+        if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_RSA )
+        {
+            mbedtls_rsa_context *rsa = mbedtls_pk_rsa( pk );
+
+            if( ( ret = mbedtls_rsa_export    ( rsa, &N, &P, &Q, &D, &E ) ) != 0 ||
+                ( ret = mbedtls_rsa_export_crt( rsa, &DP, &DQ, &QP ) )      != 0 )
+            {
+                mbedtls_printf( " failed\n  ! could not export RSA parameters\n\n" );
+                goto cleanup;
+            }
+
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "N:  ", &N, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "E:  ", &E, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "D:  ", &D, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "P:  ", &P, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "Q:  ", &Q, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "DP: ", &DP, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "DQ:  ", &DQ, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "QP:  ", &QP, 16, NULL ) );
+        }
+        else
+#endif
+#if defined(MBEDTLS_ECP_C)
+        if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY )
+        {
+            mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( pk );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "Q(X): ", &ecp->Q.X, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "D   : ", &ecp->d  , 16, NULL ) );
+        }
+        else
+#endif
+        {
+            mbedtls_printf("Do not know how to print key information for this type\n" );
+            goto cleanup;
+        }
+    }
+    else if( opt.mode == MODE_PUBLIC )
+    {
+        /*
+         * 1.1. Load the key
+         */
+        mbedtls_printf( "\n  . Loading the public key ..." );
+        fflush( stdout );
+
+        ret = mbedtls_pk_parse_public_keyfile( &pk, opt.filename );
+
+        if( ret != 0 )
+        {
+            mbedtls_printf( " failed\n  !  mbedtls_pk_parse_public_keyfile returned -0x%04x\n", (unsigned int) -ret );
+            goto cleanup;
+        }
+
+        mbedtls_printf( " ok\n" );
+
+        mbedtls_printf( "  . Key information    ...\n" );
+#if defined(MBEDTLS_RSA_C)
+        if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_RSA )
+        {
+            mbedtls_rsa_context *rsa = mbedtls_pk_rsa( pk );
+
+            if( ( ret = mbedtls_rsa_export( rsa, &N, NULL, NULL,
+                                            NULL, &E ) ) != 0 )
+            {
+                mbedtls_printf( " failed\n  ! could not export RSA parameters\n\n" );
+                goto cleanup;
+            }
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "N:  ", &N, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "E:  ", &E, 16, NULL ) );
+        }
+        else
+#endif
+#if defined(MBEDTLS_ECP_C)
+        if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY )
+        {
+            mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( pk );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "Q(X): ", &ecp->Q.X, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL ) );
+            MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL ) );
+        }
+        else
+#endif
+        {
+            mbedtls_printf("Do not know how to print key information for this type\n" );
+            goto cleanup;
+        }
+    }
+    else
+        goto usage;
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+cleanup:
+
+#if defined(MBEDTLS_ERROR_C)
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
+    {
+        mbedtls_strerror( ret, buf, sizeof( buf ) );
+        mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
+#endif
+
+    mbedtls_pk_free( &pk );
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
+    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
+    mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
+
+#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_PK_PARSE_C && MBEDTLS_FS_IO */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/key_app_writer.c b/lib/mbedtls-2.27.0/programs/pkey/key_app_writer.c
new file mode 100644
index 0000000..6a4d0e4
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/key_app_writer.c
@@ -0,0 +1,439 @@
+/*
+ *  Key writing application
+ *
+ *  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 /* MBEDTLS_PLATFORM_C */
+
+#if defined(MBEDTLS_PK_WRITE_C) && defined(MBEDTLS_FS_IO)
+#include "mbedtls/error.h"
+#include "mbedtls/pk.h"
+#include "mbedtls/error.h"
+
+#include <stdio.h>
+#include <string.h>
+#endif
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+#define USAGE_OUT \
+    "    output_file=%%s      default: keyfile.pem\n"   \
+    "    output_format=pem|der default: pem\n"
+#else
+#define USAGE_OUT \
+    "    output_file=%%s      default: keyfile.der\n"   \
+    "    output_format=der     default: der\n"
+#endif
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+#define DFL_OUTPUT_FILENAME     "keyfile.pem"
+#define DFL_OUTPUT_FORMAT       OUTPUT_FORMAT_PEM
+#else
+#define DFL_OUTPUT_FILENAME     "keyfile.der"
+#define DFL_OUTPUT_FORMAT       OUTPUT_FORMAT_DER
+#endif
+
+#define DFL_MODE                MODE_NONE
+#define DFL_FILENAME            "keyfile.key"
+#define DFL_DEBUG_LEVEL         0
+#define DFL_OUTPUT_MODE         OUTPUT_MODE_NONE
+
+#define MODE_NONE               0
+#define MODE_PRIVATE            1
+#define MODE_PUBLIC             2
+
+#define OUTPUT_MODE_NONE               0
+#define OUTPUT_MODE_PRIVATE            1
+#define OUTPUT_MODE_PUBLIC             2
+
+#define OUTPUT_FORMAT_PEM              0
+#define OUTPUT_FORMAT_DER              1
+
+#define USAGE \
+    "\n usage: key_app_writer param=<>...\n"            \
+    "\n acceptable parameters:\n"                       \
+    "    mode=private|public default: none\n"           \
+    "    filename=%%s         default: keyfile.key\n"   \
+    "    output_mode=private|public default: none\n"    \
+    USAGE_OUT                                           \
+    "\n"
+
+#if !defined(MBEDTLS_PK_PARSE_C) || \
+    !defined(MBEDTLS_PK_WRITE_C) || \
+    !defined(MBEDTLS_FS_IO)
+int main( void )
+{
+    mbedtls_printf( "MBEDTLS_PK_PARSE_C and/or MBEDTLS_PK_WRITE_C and/or MBEDTLS_FS_IO not defined.\n" );
+    mbedtls_exit( 0 );
+}
+#else
+
+
+/*
+ * global options
+ */
+struct options
+{
+    int mode;                   /* the mode to run the application in   */
+    const char *filename;       /* filename of the key file             */
+    int output_mode;            /* the output mode to use               */
+    const char *output_file;    /* where to store the constructed key file  */
+    int output_format;          /* the output format to use             */
+} opt;
+
+static int write_public_key( mbedtls_pk_context *key, const char *output_file )
+{
+    int ret;
+    FILE *f;
+    unsigned char output_buf[16000];
+    unsigned char *c = output_buf;
+    size_t len = 0;
+
+    memset(output_buf, 0, 16000);
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+    if( opt.output_format == OUTPUT_FORMAT_PEM )
+    {
+        if( ( ret = mbedtls_pk_write_pubkey_pem( key, output_buf, 16000 ) ) != 0 )
+            return( ret );
+
+        len = strlen( (char *) output_buf );
+    }
+    else
+#endif
+    {
+        if( ( ret = mbedtls_pk_write_pubkey_der( key, output_buf, 16000 ) ) < 0 )
+            return( ret );
+
+        len = ret;
+        c = output_buf + sizeof(output_buf) - len;
+    }
+
+    if( ( f = fopen( output_file, "w" ) ) == NULL )
+        return( -1 );
+
+    if( fwrite( c, 1, len, f ) != len )
+    {
+        fclose( f );
+        return( -1 );
+    }
+
+    fclose( f );
+
+    return( 0 );
+}
+
+static int write_private_key( mbedtls_pk_context *key, const char *output_file )
+{
+    int ret;
+    FILE *f;
+    unsigned char output_buf[16000];
+    unsigned char *c = output_buf;
+    size_t len = 0;
+
+    memset(output_buf, 0, 16000);
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+    if( opt.output_format == OUTPUT_FORMAT_PEM )
+    {
+        if( ( ret = mbedtls_pk_write_key_pem( key, output_buf, 16000 ) ) != 0 )
+            return( ret );
+
+        len = strlen( (char *) output_buf );
+    }
+    else
+#endif
+    {
+        if( ( ret = mbedtls_pk_write_key_der( key, output_buf, 16000 ) ) < 0 )
+            return( ret );
+
+        len = ret;
+        c = output_buf + sizeof(output_buf) - len;
+    }
+
+    if( ( f = fopen( output_file, "w" ) ) == NULL )
+        return( -1 );
+
+    if( fwrite( c, 1, len, f ) != len )
+    {
+        fclose( f );
+        return( -1 );
+    }
+
+    fclose( f );
+
+    return( 0 );
+}
+
+int main( int argc, char *argv[] )
+{
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    char buf[1024];
+    int i;
+    char *p, *q;
+
+    mbedtls_pk_context key;
+    mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
+
+    /*
+     * Set to sane values
+     */
+    mbedtls_pk_init( &key );
+    memset( buf, 0, sizeof( buf ) );
+
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
+    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
+    mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
+
+    if( argc == 0 )
+    {
+    usage:
+        mbedtls_printf( USAGE );
+        goto exit;
+    }
+
+    opt.mode                = DFL_MODE;
+    opt.filename            = DFL_FILENAME;
+    opt.output_mode         = DFL_OUTPUT_MODE;
+    opt.output_file         = DFL_OUTPUT_FILENAME;
+    opt.output_format       = DFL_OUTPUT_FORMAT;
+
+    for( i = 1; i < argc; i++ )
+    {
+        p = argv[i];
+        if( ( q = strchr( p, '=' ) ) == NULL )
+            goto usage;
+        *q++ = '\0';
+
+        if( strcmp( p, "mode" ) == 0 )
+        {
+            if( strcmp( q, "private" ) == 0 )
+                opt.mode = MODE_PRIVATE;
+            else if( strcmp( q, "public" ) == 0 )
+                opt.mode = MODE_PUBLIC;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "output_mode" ) == 0 )
+        {
+            if( strcmp( q, "private" ) == 0 )
+                opt.output_mode = OUTPUT_MODE_PRIVATE;
+            else if( strcmp( q, "public" ) == 0 )
+                opt.output_mode = OUTPUT_MODE_PUBLIC;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "output_format" ) == 0 )
+        {
+#if defined(MBEDTLS_PEM_WRITE_C)
+            if( strcmp( q, "pem" ) == 0 )
+                opt.output_format = OUTPUT_FORMAT_PEM;
+            else
+#endif
+            if( strcmp( q, "der" ) == 0 )
+                opt.output_format = OUTPUT_FORMAT_DER;
+            else
+                goto usage;
+        }
+        else if( strcmp( p, "filename" ) == 0 )
+            opt.filename = q;
+        else if( strcmp( p, "output_file" ) == 0 )
+            opt.output_file = q;
+        else
+            goto usage;
+    }
+
+    if( opt.mode == MODE_NONE && opt.output_mode != OUTPUT_MODE_NONE )
+    {
+        mbedtls_printf( "\nCannot output a key without reading one.\n");
+        goto exit;
+    }
+
+    if( opt.mode == MODE_PUBLIC && opt.output_mode == OUTPUT_MODE_PRIVATE )
+    {
+        mbedtls_printf( "\nCannot output a private key from a public key.\n");
+        goto exit;
+    }
+
+    if( opt.mode == MODE_PRIVATE )
+    {
+        /*
+         * 1.1. Load the key
+         */
+        mbedtls_printf( "\n  . Loading the private key ..." );
+        fflush( stdout );
+
+        ret = mbedtls_pk_parse_keyfile( &key, opt.filename, NULL );
+
+        if( ret != 0 )
+        {
+            mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
+            mbedtls_printf( " failed\n  !  mbedtls_pk_parse_keyfile returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+            goto exit;
+        }
+
+        mbedtls_printf( " ok\n" );
+
+        /*
+         * 1.2 Print the key
+         */
+        mbedtls_printf( "  . Key information    ...\n" );
+
+#if defined(MBEDTLS_RSA_C)
+        if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_RSA )
+        {
+            mbedtls_rsa_context *rsa = mbedtls_pk_rsa( key );
+
+            if( ( ret = mbedtls_rsa_export    ( rsa, &N, &P, &Q, &D, &E ) ) != 0 ||
+                ( ret = mbedtls_rsa_export_crt( rsa, &DP, &DQ, &QP ) )      != 0 )
+            {
+                mbedtls_printf( " failed\n  ! could not export RSA parameters\n\n" );
+                goto exit;
+            }
+
+            mbedtls_mpi_write_file( "N:  ",  &N,  16, NULL );
+            mbedtls_mpi_write_file( "E:  ",  &E,  16, NULL );
+            mbedtls_mpi_write_file( "D:  ",  &D,  16, NULL );
+            mbedtls_mpi_write_file( "P:  ",  &P,  16, NULL );
+            mbedtls_mpi_write_file( "Q:  ",  &Q,  16, NULL );
+            mbedtls_mpi_write_file( "DP: ",  &DP, 16, NULL );
+            mbedtls_mpi_write_file( "DQ:  ", &DQ, 16, NULL );
+            mbedtls_mpi_write_file( "QP:  ", &QP, 16, NULL );
+        }
+        else
+#endif
+#if defined(MBEDTLS_ECP_C)
+        if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_ECKEY )
+        {
+            mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( key );
+            mbedtls_mpi_write_file( "Q(X): ", &ecp->Q.X, 16, NULL );
+            mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL );
+            mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL );
+            mbedtls_mpi_write_file( "D   : ", &ecp->d  , 16, NULL );
+        }
+        else
+#endif
+            mbedtls_printf("key type not supported yet\n");
+
+    }
+    else if( opt.mode == MODE_PUBLIC )
+    {
+        /*
+         * 1.1. Load the key
+         */
+        mbedtls_printf( "\n  . Loading the public key ..." );
+        fflush( stdout );
+
+        ret = mbedtls_pk_parse_public_keyfile( &key, opt.filename );
+
+        if( ret != 0 )
+        {
+            mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
+            mbedtls_printf( " failed\n  !  mbedtls_pk_parse_public_key returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+            goto exit;
+        }
+
+        mbedtls_printf( " ok\n" );
+
+        /*
+         * 1.2 Print the key
+         */
+        mbedtls_printf( "  . Key information    ...\n" );
+
+#if defined(MBEDTLS_RSA_C)
+        if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_RSA )
+        {
+            mbedtls_rsa_context *rsa = mbedtls_pk_rsa( key );
+
+            if( ( ret = mbedtls_rsa_export( rsa, &N, NULL, NULL,
+                                            NULL, &E ) ) != 0 )
+            {
+                mbedtls_printf( " failed\n  ! could not export RSA parameters\n\n" );
+                goto exit;
+            }
+            mbedtls_mpi_write_file( "N: ", &N, 16, NULL );
+            mbedtls_mpi_write_file( "E: ", &E, 16, NULL );
+        }
+        else
+#endif
+#if defined(MBEDTLS_ECP_C)
+        if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_ECKEY )
+        {
+            mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( key );
+            mbedtls_mpi_write_file( "Q(X): ", &ecp->Q.X, 16, NULL );
+            mbedtls_mpi_write_file( "Q(Y): ", &ecp->Q.Y, 16, NULL );
+            mbedtls_mpi_write_file( "Q(Z): ", &ecp->Q.Z, 16, NULL );
+        }
+        else
+#endif
+            mbedtls_printf("key type not supported yet\n");
+    }
+    else
+        goto usage;
+
+    if( opt.output_mode == OUTPUT_MODE_PUBLIC )
+    {
+        write_public_key( &key, opt.output_file );
+    }
+    if( opt.output_mode == OUTPUT_MODE_PRIVATE )
+    {
+        write_private_key( &key, opt.output_file );
+    }
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
+    {
+#ifdef MBEDTLS_ERROR_C
+        mbedtls_strerror( ret, buf, sizeof( buf ) );
+        mbedtls_printf( " - %s\n", buf );
+#else
+        mbedtls_printf("\n");
+#endif
+    }
+
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
+    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
+    mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
+
+    mbedtls_pk_free( &key );
+
+#if defined(_WIN32)
+    mbedtls_printf( "  + Press Enter to exit this program.\n" );
+    fflush( stdout ); getchar();
+#endif
+
+    mbedtls_exit( exit_code );
+}
+#endif /* MBEDTLS_PK_PARSE_C && MBEDTLS_PK_WRITE_C && MBEDTLS_FS_IO */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/mpi_demo.c b/lib/mbedtls-2.27.0/programs/pkey/mpi_demo.c
new file mode 100644
index 0000000..8245d01
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/mpi_demo.c
@@ -0,0 +1,115 @@
+/*
+ *  Simple MPI 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_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_FS_IO)
+#include "mbedtls/bignum.h"
+
+#include <stdio.h>
+#endif
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_FS_IO)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_FS_IO not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+
+int main( void )
+{
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_mpi E, P, Q, N, H, D, X, Y, Z;
+
+    mbedtls_mpi_init( &E ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &N );
+    mbedtls_mpi_init( &H ); mbedtls_mpi_init( &D ); mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
+    mbedtls_mpi_init( &Z );
+
+    MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &P, 10, "2789" ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &Q, 10, "3203" ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &E, 10,  "257" ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &N, &P, &Q ) );
+
+    mbedtls_printf( "\n  Public key:\n\n" );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "  N = ", &N, 10, NULL ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "  E = ", &E, 10, NULL ) );
+
+    mbedtls_printf( "\n  Private key:\n\n" );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "  P = ", &P, 10, NULL ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "  Q = ", &Q, 10, NULL ) );
+
+#if defined(MBEDTLS_GENPRIME)
+    MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P, &P, 1 ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q, &Q, 1 ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P, &Q ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &D, &E, &H ) );
+
+    mbedtls_mpi_write_file( "  D = E^-1 mod (P-1)*(Q-1) = ",
+                    &D, 10, NULL );
+#else
+    mbedtls_printf("\nTest skipped (MBEDTLS_GENPRIME not defined).\n\n");
+#endif
+    MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &X, 10, "55555" ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &Y, &X, &E, &N, NULL ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &Z, &Y, &D, &N, NULL ) );
+
+    mbedtls_printf( "\n  RSA operation:\n\n" );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "  X (plaintext)  = ", &X, 10, NULL ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "  Y (ciphertext) = X^E mod N = ", &Y, 10, NULL ) );
+    MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( "  Z (decrypted)  = Y^D mod N = ", &Z, 10, NULL ) );
+    mbedtls_printf( "\n" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+cleanup:
+    mbedtls_mpi_free( &E ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &N );
+    mbedtls_mpi_free( &H ); mbedtls_mpi_free( &D ); mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
+    mbedtls_mpi_free( &Z );
+
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
+    {
+        mbedtls_printf( "\nAn error occurred.\n" );
+    }
+
+#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_FS_IO */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/pk_decrypt.c b/lib/mbedtls-2.27.0/programs/pkey/pk_decrypt.c
new file mode 100644
index 0000000..810d6fb
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/pk_decrypt.c
@@ -0,0 +1,176 @@
+/*
+ *  Public key-based simple decryption 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_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_PK_PARSE_C) && \
+    defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_C) && \
+    defined(MBEDTLS_CTR_DRBG_C)
+#include "mbedtls/error.h"
+#include "mbedtls/pk.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <stdio.h>
+#include <string.h>
+#endif
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_PK_PARSE_C) ||  \
+    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \
+    !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_PK_PARSE_C and/or "
+           "MBEDTLS_FS_IO and/or MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    unsigned c;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t i, olen = 0;
+    mbedtls_pk_context pk;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    unsigned char result[1024];
+    unsigned char buf[512];
+    const char *pers = "mbedtls_pk_decrypt";
+    ((void) argv);
+
+    mbedtls_pk_init( &pk );
+    mbedtls_entropy_init( &entropy );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    memset(result, 0, sizeof( result ) );
+
+    if( argc != 2 )
+    {
+        mbedtls_printf( "usage: mbedtls_pk_decrypt <key_file>\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . 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 -0x%04x\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Reading private key from '%s'", argv[1] );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "" ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_pk_parse_keyfile returned -0x%04x\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    /*
+     * Extract the RSA encrypted value from the text file
+     */
+    if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
+    {
+        mbedtls_printf( "\n  ! Could not open %s\n\n", "result-enc.txt" );
+        ret = 1;
+        goto exit;
+    }
+
+    i = 0;
+    while( fscanf( f, "%02X", (unsigned int*) &c ) > 0 &&
+           i < (int) sizeof( buf ) )
+    {
+        buf[i++] = (unsigned char) c;
+    }
+
+    fclose( f );
+
+    /*
+     * Decrypt the encrypted RSA data and print the result.
+     */
+    mbedtls_printf( "\n  . Decrypting the encrypted data" );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_pk_decrypt( &pk, buf, i, result, &olen, sizeof(result),
+                            mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_pk_decrypt returned -0x%04x\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . OK\n\n" );
+
+    mbedtls_printf( "The decrypted result is: '%s'\n\n", result );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    mbedtls_pk_free( &pk );
+    mbedtls_entropy_free( &entropy );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+
+#if defined(MBEDTLS_ERROR_C)
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
+    {
+        mbedtls_strerror( ret, (char *) buf, sizeof( buf ) );
+        mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
+#endif
+
+#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_PK_PARSE_C && MBEDTLS_FS_IO &&
+          MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/pk_encrypt.c b/lib/mbedtls-2.27.0/programs/pkey/pk_encrypt.c
new file mode 100644
index 0000000..e629dc1
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/pk_encrypt.c
@@ -0,0 +1,180 @@
+/*
+ *  RSA simple data encryption 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_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_PK_PARSE_C) && \
+    defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
+    defined(MBEDTLS_CTR_DRBG_C)
+#include "mbedtls/error.h"
+#include "mbedtls/pk.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <stdio.h>
+#include <string.h>
+#endif
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_PK_PARSE_C) ||  \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO) || \
+    !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_PK_PARSE_C and/or "
+           "MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO and/or "
+           "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t i, olen = 0;
+    mbedtls_pk_context pk;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    unsigned char input[1024];
+    unsigned char buf[512];
+    const char *pers = "mbedtls_pk_encrypt";
+
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+    mbedtls_entropy_init( &entropy );
+    mbedtls_pk_init( &pk );
+
+    if( argc != 3 )
+    {
+        mbedtls_printf( "usage: mbedtls_pk_encrypt <key_file> <string of max 100 characters>\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . 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 -0x%04x\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Reading public key from '%s'", argv[1] );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    if( strlen( argv[2] ) > 100 )
+    {
+        mbedtls_printf( " Input data larger than 100 characters.\n\n" );
+        goto exit;
+    }
+
+    memcpy( input, argv[2], strlen( argv[2] ) );
+
+    /*
+     * Calculate the RSA encryption of the hash.
+     */
+    mbedtls_printf( "\n  . Generating the encrypted value" );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_pk_encrypt( &pk, input, strlen( argv[2] ),
+                            buf, &olen, sizeof(buf),
+                            mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_pk_encrypt returned -0x%04x\n",
+                        (unsigned int) -ret );
+        goto exit;
+    }
+
+    /*
+     * Write the signature into result-enc.txt
+     */
+    if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not create %s\n\n",
+                        "result-enc.txt" );
+        ret = 1;
+        goto exit;
+    }
+
+    for( i = 0; i < olen; i++ )
+    {
+        mbedtls_fprintf( f, "%02X%s", buf[i],
+                 ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
+    }
+
+    fclose( f );
+
+    mbedtls_printf( "\n  . Done (created \"%s\")\n\n", "result-enc.txt" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    mbedtls_pk_free( &pk );
+    mbedtls_entropy_free( &entropy );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+
+#if defined(MBEDTLS_ERROR_C)
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
+    {
+        mbedtls_strerror( ret, (char *) buf, sizeof( buf ) );
+        mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
+#endif
+
+#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_PK_PARSE_C && MBEDTLS_ENTROPY_C &&
+          MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/pk_sign.c b/lib/mbedtls-2.27.0/programs/pkey/pk_sign.c
new file mode 100644
index 0000000..451e3de
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/pk_sign.c
@@ -0,0 +1,178 @@
+/*
+ *  Public key-based signature creation 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_snprintf        snprintf
+#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_SHA256_C) || !defined(MBEDTLS_MD_C) || \
+    !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) ||    \
+    !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_SHA256_C and/or MBEDTLS_MD_C and/or "
+           "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
+           "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/error.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/md.h"
+#include "mbedtls/pk.h"
+
+#include <stdio.h>
+#include <string.h>
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_pk_context pk;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    unsigned char hash[32];
+    unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
+    char filename[512];
+    const char *pers = "mbedtls_pk_sign";
+    size_t olen = 0;
+
+    mbedtls_entropy_init( &entropy );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+    mbedtls_pk_init( &pk );
+
+    if( argc != 3 )
+    {
+        mbedtls_printf( "usage: mbedtls_pk_sign <key_file> <filename>\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . 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 -0x%04x\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Reading private key from '%s'", argv[1] );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "" ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Could not parse '%s'\n", argv[1] );
+        goto exit;
+    }
+
+    /*
+     * Compute the SHA-256 hash of the input file,
+     * then calculate the signature of the hash.
+     */
+    mbedtls_printf( "\n  . Generating the SHA-256 signature" );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_md_file(
+                    mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
+                    argv[2], hash ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Could not open or read %s\n\n", argv[2] );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, 0, buf, &olen,
+                         mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_pk_sign returned -0x%04x\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    /*
+     * Write the signature into <filename>.sig
+     */
+    mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
+
+    if( ( f = fopen( filename, "wb+" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not create %s\n\n", filename );
+        goto exit;
+    }
+
+    if( fwrite( buf, 1, olen, f ) != olen )
+    {
+        mbedtls_printf( "failed\n  ! fwrite failed\n\n" );
+        fclose( f );
+        goto exit;
+    }
+
+    fclose( f );
+
+    mbedtls_printf( "\n  . Done (created \"%s\")\n\n", filename );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+    mbedtls_pk_free( &pk );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+
+#if defined(MBEDTLS_ERROR_C)
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
+    {
+        mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
+        mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
+#endif
+
+#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_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
+          MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/pk_verify.c b/lib/mbedtls-2.27.0/programs/pkey/pk_verify.c
new file mode 100644
index 0000000..ee72243
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/pk_verify.c
@@ -0,0 +1,151 @@
+/*
+ *  Public key-based signature verification 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_snprintf        snprintf
+#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_MD_C) || \
+    !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_PK_PARSE_C) ||   \
+    !defined(MBEDTLS_FS_IO)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_MD_C and/or "
+           "MBEDTLS_SHA256_C and/or MBEDTLS_PK_PARSE_C and/or "
+           "MBEDTLS_FS_IO not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/error.h"
+#include "mbedtls/md.h"
+#include "mbedtls/pk.h"
+
+#include <stdio.h>
+#include <string.h>
+
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t i;
+    mbedtls_pk_context pk;
+    unsigned char hash[32];
+    unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
+    char filename[512];
+
+    mbedtls_pk_init( &pk );
+
+    if( argc != 3 )
+    {
+        mbedtls_printf( "usage: mbedtls_pk_verify <key_file> <filename>\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Reading public key from '%s'", argv[1] );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    /*
+     * Extract the signature from the file
+     */
+    mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
+
+    if( ( f = fopen( filename, "rb" ) ) == NULL )
+    {
+        mbedtls_printf( "\n  ! Could not open %s\n\n", filename );
+        goto exit;
+    }
+
+    i = fread( buf, 1, sizeof(buf), f );
+
+    fclose( f );
+
+    /*
+     * Compute the SHA-256 hash of the input file and
+     * verify the signature
+     */
+    mbedtls_printf( "\n  . Verifying the SHA-256 signature" );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_md_file(
+                    mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
+                    argv[2], hash ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Could not open or read %s\n\n", argv[2] );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256, hash, 0,
+                           buf, i ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_pk_verify returned -0x%04x\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+    mbedtls_pk_free( &pk );
+
+#if defined(MBEDTLS_ERROR_C)
+    if( exit_code != MBEDTLS_EXIT_SUCCESS )
+    {
+        mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
+        mbedtls_printf( "  !  Last error was: %s\n", buf );
+    }
+#endif
+
+#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_SHA256_C &&
+          MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_decrypt.c b/lib/mbedtls-2.27.0/programs/pkey/rsa_decrypt.c
new file mode 100644
index 0000000..01bf3a6
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_decrypt.c
@@ -0,0 +1,210 @@
+/*
+ *  RSA simple decryption 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_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_RSA_C) && \
+    defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_C) && \
+    defined(MBEDTLS_CTR_DRBG_C)
+#include "mbedtls/rsa.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <string.h>
+
+#endif
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
+    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \
+    !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
+           "MBEDTLS_FS_IO and/or MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    unsigned c;
+    size_t i;
+    mbedtls_rsa_context rsa;
+    mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    unsigned char result[1024];
+    unsigned char buf[512];
+    const char *pers = "rsa_decrypt";
+    ((void) argv);
+
+    memset(result, 0, sizeof( result ) );
+
+    if( argc != 1 )
+    {
+        mbedtls_printf( "usage: rsa_decrypt\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        mbedtls_exit( exit_code );
+    }
+
+    mbedtls_printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+    mbedtls_entropy_init( &entropy );
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
+    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
+    mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
+
+    ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
+                                        &entropy, (const unsigned char *) pers,
+                                        strlen( pers ) );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n",
+                        ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Reading private key from rsa_priv.txt" );
+    fflush( stdout );
+
+    if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not open rsa_priv.txt\n" \
+                "  ! Please run rsa_genkey first\n\n" );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &E , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &D , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &P , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &Q , 16, f ) )  != 0 ||
+        ( ret = mbedtls_mpi_read_file( &DP , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &DQ , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &QP , 16, f ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n",
+                        ret );
+        fclose( f );
+        goto exit;
+    }
+    fclose( f );
+
+    if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_import returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_complete returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+
+    /*
+     * Extract the RSA encrypted value from the text file
+     */
+    if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL )
+    {
+        mbedtls_printf( "\n  ! Could not open %s\n\n", "result-enc.txt" );
+        goto exit;
+    }
+
+    i = 0;
+
+    while( fscanf( f, "%02X", (unsigned int*) &c ) > 0 &&
+           i < (int) sizeof( buf ) )
+        buf[i++] = (unsigned char) c;
+
+    fclose( f );
+
+    if( i != rsa.len )
+    {
+        mbedtls_printf( "\n  ! Invalid RSA signature format\n\n" );
+        goto exit;
+    }
+
+    /*
+     * Decrypt the encrypted RSA data and print the result.
+     */
+    mbedtls_printf( "\n  . Decrypting the encrypted data" );
+    fflush( stdout );
+
+    ret = mbedtls_rsa_pkcs1_decrypt( &rsa, mbedtls_ctr_drbg_random,
+                                            &ctr_drbg, MBEDTLS_RSA_PRIVATE, &i,
+                                            buf, result, 1024 );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_decrypt returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . OK\n\n" );
+
+    mbedtls_printf( "The decrypted result is: '%s'\n\n", result );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+    mbedtls_rsa_free( &rsa );
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
+    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
+    mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
+
+#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_RSA_C && MBEDTLS_FS_IO */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_encrypt.c b/lib/mbedtls-2.27.0/programs/pkey/rsa_encrypt.c
new file mode 100644
index 0000000..ba01201
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_encrypt.c
@@ -0,0 +1,188 @@
+/*
+ *  RSA simple data encryption 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_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_RSA_C) && \
+    defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
+    defined(MBEDTLS_CTR_DRBG_C)
+#include "mbedtls/rsa.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+
+#include <string.h>
+#endif
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO) || \
+    !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
+           "MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO and/or "
+           "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t i;
+    mbedtls_rsa_context rsa;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    unsigned char input[1024];
+    unsigned char buf[512];
+    const char *pers = "rsa_encrypt";
+    mbedtls_mpi N, E;
+
+    if( argc != 2 )
+    {
+        mbedtls_printf( "usage: rsa_encrypt <string of max 100 characters>\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        mbedtls_exit( exit_code );
+    }
+
+    mbedtls_printf( "\n  . Seeding the random number generator..." );
+    fflush( stdout );
+
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
+    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+    mbedtls_entropy_init( &entropy );
+
+    ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
+                                 &entropy, (const unsigned char *) pers,
+                                 strlen( pers ) );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_ctr_drbg_seed returned %d\n",
+                        ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Reading public key from rsa_pub.txt" );
+    fflush( stdout );
+
+    if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not open rsa_pub.txt\n" \
+                "  ! Please run rsa_genkey first\n\n" );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_mpi_read_file( &N, 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &E, 16, f ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n",
+                        ret );
+        fclose( f );
+        goto exit;
+    }
+    fclose( f );
+
+    if( ( ret = mbedtls_rsa_import( &rsa, &N, NULL, NULL, NULL, &E ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_import returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+
+    if( strlen( argv[1] ) > 100 )
+    {
+        mbedtls_printf( " Input data larger than 100 characters.\n\n" );
+        goto exit;
+    }
+
+    memcpy( input, argv[1], strlen( argv[1] ) );
+
+    /*
+     * Calculate the RSA encryption of the hash.
+     */
+    mbedtls_printf( "\n  . Generating the RSA encrypted value" );
+    fflush( stdout );
+
+    ret = mbedtls_rsa_pkcs1_encrypt( &rsa, mbedtls_ctr_drbg_random,
+                                     &ctr_drbg, MBEDTLS_RSA_PUBLIC,
+                                     strlen( argv[1] ), input, buf );
+    if( ret != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_encrypt returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+
+    /*
+     * Write the signature into result-enc.txt
+     */
+    if( ( f = fopen( "result-enc.txt", "wb+" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not create %s\n\n", "result-enc.txt" );
+        goto exit;
+    }
+
+    for( i = 0; i < rsa.len; i++ )
+        mbedtls_fprintf( f, "%02X%s", buf[i],
+                 ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
+
+    fclose( f );
+
+    mbedtls_printf( "\n  . Done (created \"%s\")\n\n", "result-enc.txt" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
+    mbedtls_ctr_drbg_free( &ctr_drbg );
+    mbedtls_entropy_free( &entropy );
+    mbedtls_rsa_free( &rsa );
+
+#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_RSA_C && MBEDTLS_ENTROPY_C &&
+          MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_genkey.c b/lib/mbedtls-2.27.0/programs/pkey/rsa_genkey.c
new file mode 100644
index 0000000..26a8925
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_genkey.c
@@ -0,0 +1,176 @@
+/*
+ *  Example RSA key generation 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_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_RSA_C) && defined(MBEDTLS_GENPRIME) && \
+    defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C)
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/bignum.h"
+#include "mbedtls/rsa.h"
+
+#include <stdio.h>
+#include <string.h>
+#endif
+
+#define KEY_SIZE 2048
+#define EXPONENT 65537
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) ||   \
+    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_GENPRIME) ||      \
+    !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_RSA_C and/or MBEDTLS_GENPRIME and/or "
+           "MBEDTLS_FS_IO and/or MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+
+int main( void )
+{
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_rsa_context rsa;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
+    FILE *fpub  = NULL;
+    FILE *fpriv = NULL;
+    const char *pers = "rsa_genkey";
+
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
+    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
+    mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
+
+    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  . Generating the RSA key [ %d-bit ]...", KEY_SIZE );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_rsa_gen_key( &rsa, mbedtls_ctr_drbg_random, &ctr_drbg, KEY_SIZE,
+                                     EXPONENT ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_gen_key returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n  . Exporting the public  key in rsa_pub.txt...." );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_rsa_export    ( &rsa, &N, &P, &Q, &D, &E ) ) != 0 ||
+        ( ret = mbedtls_rsa_export_crt( &rsa, &DP, &DQ, &QP ) )      != 0 )
+    {
+        mbedtls_printf( " failed\n  ! could not export RSA parameters\n\n" );
+        goto exit;
+    }
+
+    if( ( fpub = fopen( "rsa_pub.txt", "wb+" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! could not open rsa_pub.txt for writing\n\n" );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_mpi_write_file( "N = ", &N, 16, fpub ) ) != 0 ||
+        ( ret = mbedtls_mpi_write_file( "E = ", &E, 16, fpub ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_write_file returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( " ok\n  . Exporting the private key in rsa_priv.txt..." );
+    fflush( stdout );
+
+    if( ( fpriv = fopen( "rsa_priv.txt", "wb+" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! could not open rsa_priv.txt for writing\n" );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_mpi_write_file( "N = " , &N , 16, fpriv ) ) != 0 ||
+        ( ret = mbedtls_mpi_write_file( "E = " , &E , 16, fpriv ) ) != 0 ||
+        ( ret = mbedtls_mpi_write_file( "D = " , &D , 16, fpriv ) ) != 0 ||
+        ( ret = mbedtls_mpi_write_file( "P = " , &P , 16, fpriv ) ) != 0 ||
+        ( ret = mbedtls_mpi_write_file( "Q = " , &Q , 16, fpriv ) ) != 0 ||
+        ( ret = mbedtls_mpi_write_file( "DP = ", &DP, 16, fpriv ) ) != 0 ||
+        ( ret = mbedtls_mpi_write_file( "DQ = ", &DQ, 16, fpriv ) ) != 0 ||
+        ( ret = mbedtls_mpi_write_file( "QP = ", &QP, 16, fpriv ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_write_file returned %d\n\n", ret );
+        goto exit;
+    }
+    mbedtls_printf( " ok\n\n" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    if( fpub  != NULL )
+        fclose( fpub );
+
+    if( fpriv != NULL )
+        fclose( fpriv );
+
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
+    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
+    mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
+    mbedtls_rsa_free( &rsa );
+    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_RSA_C &&
+          MBEDTLS_GENPRIME && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_priv.txt b/lib/mbedtls-2.27.0/programs/pkey/rsa_priv.txt
new file mode 100644
index 0000000..254fcf8
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_priv.txt
@@ -0,0 +1,8 @@
+N = A1D46FBA2318F8DCEF16C280948B1CF27966B9B47225ED2989F8D74B45BD36049C0AAB5AD0FF003553BA843C8E12782FC5873BB89A3DC84B883D25666CD22BF3ACD5B675969F8BEBFBCAC93FDD927C7442B178B10D1DFF9398E52316AAE0AF74E594650BDC3C670241D418684593CDA1A7B9DC4F20D2FDC6F66344074003E211
+E = 010001
+D = 589552BB4F2F023ADDDD5586D0C8FD857512D82080436678D07F984A29D892D31F1F7000FC5A39A0F73E27D885E47249A4148C8A5653EF69F91F8F736BA9F84841C2D99CD8C24DE8B72B5C9BE0EDBE23F93D731749FEA9CFB4A48DD2B7F35A2703E74AA2D4DB7DE9CEEA7D763AF0ADA7AC176C4E9A22C4CDA65CEC0C65964401
+P = CD083568D2D46C44C40C1FA0101AF2155E59C70B08423112AF0C1202514BBA5210765E29FF13036F56C7495894D80CF8C3BAEE2839BACBB0B86F6A2965F60DB1
+Q = CA0EEEA5E710E8E9811A6B846399420E3AE4A4C16647E426DDF8BBBCB11CD3F35CE2E4B6BCAD07AE2C0EC2ECBFCC601B207CDD77B5673E16382B1130BF465261
+DP = 0D0E21C07BF434B4A83B116472C2147A11D8EB98A33CFBBCF1D275EF19D815941622435AAF3839B6C432CA53CE9E772CFBE1923A937A766FD93E96E6EDEC1DF1
+DQ = 269CEBE6305DFEE4809377F078C814E37B45AE6677114DFC4F76F5097E1F3031D592567AC55B9B98213B40ECD54A4D2361F5FAACA1B1F51F71E4690893C4F081
+QP = 97AC5BB885ABCA314375E9E4DB1BA4B2218C90619F61BD474F5785075ECA81750A735199A8C191FE2D3355E7CF601A70E5CABDE0E02C2538BB9FB4871540B3C1
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_pub.txt b/lib/mbedtls-2.27.0/programs/pkey/rsa_pub.txt
new file mode 100644
index 0000000..1e7ae0c
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_pub.txt
@@ -0,0 +1,2 @@
+N = A1D46FBA2318F8DCEF16C280948B1CF27966B9B47225ED2989F8D74B45BD36049C0AAB5AD0FF003553BA843C8E12782FC5873BB89A3DC84B883D25666CD22BF3ACD5B675969F8BEBFBCAC93FDD927C7442B178B10D1DFF9398E52316AAE0AF74E594650BDC3C670241D418684593CDA1A7B9DC4F20D2FDC6F66344074003E211
+E = 010001
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_sign.c b/lib/mbedtls-2.27.0/programs/pkey/rsa_sign.c
new file mode 100644
index 0000000..c9522c8
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_sign.c
@@ -0,0 +1,192 @@
+/*
+ *  RSA/SHA-256 signature creation 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_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 /* MBEDTLS_PLATFORM_C */
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
+    !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
+    !defined(MBEDTLS_FS_IO)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
+            "MBEDTLS_MD_C and/or "
+            "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/rsa.h"
+#include "mbedtls/md.h"
+
+#include <stdio.h>
+#include <string.h>
+
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t i;
+    mbedtls_rsa_context rsa;
+    unsigned char hash[32];
+    unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
+    char filename[512];
+    mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
+
+    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
+
+    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
+    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
+    mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
+
+    if( argc != 2 )
+    {
+        mbedtls_printf( "usage: rsa_sign <filename>\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Reading private key from rsa_priv.txt" );
+    fflush( stdout );
+
+    if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not open rsa_priv.txt\n" \
+                "  ! Please run rsa_genkey first\n\n" );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &D , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &P , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &Q , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &DP , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &DQ , 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &QP , 16, f ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n", ret );
+        fclose( f );
+        goto exit;
+    }
+    fclose( f );
+
+    if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_import returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_complete returned %d\n\n",
+                        ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Checking the private key" );
+    fflush( stdout );
+    if( ( ret = mbedtls_rsa_check_privkey( &rsa ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_check_privkey failed with -0x%0x\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    /*
+     * Compute the SHA-256 hash of the input file,
+     * then calculate the RSA signature of the hash.
+     */
+    mbedtls_printf( "\n  . Generating the RSA/SHA-256 signature" );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_md_file(
+                    mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
+                    argv[1], hash ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Could not open or read %s\n\n", argv[1] );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256,
+                                20, hash, buf ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_sign returned -0x%0x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    /*
+     * Write the signature into <filename>.sig
+     */
+    mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
+
+    if( ( f = fopen( filename, "wb+" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not create %s\n\n", argv[1] );
+        goto exit;
+    }
+
+    for( i = 0; i < rsa.len; i++ )
+        mbedtls_fprintf( f, "%02X%s", buf[i],
+                 ( i + 1 ) % 16 == 0 ? "\r\n" : " " );
+
+    fclose( f );
+
+    mbedtls_printf( "\n  . Done (created \"%s\")\n\n", filename );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    mbedtls_rsa_free( &rsa );
+    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
+    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
+    mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
+
+#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_RSA_C && MBEDTLS_SHA256_C &&
+          MBEDTLS_FS_IO */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_sign_pss.c b/lib/mbedtls-2.27.0/programs/pkey/rsa_sign_pss.c
new file mode 100644
index 0000000..9d5053a
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_sign_pss.c
@@ -0,0 +1,180 @@
+/*
+ *  RSASSA-PSS/SHA-256 signature creation 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_snprintf        snprintf
+#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_MD_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
+    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) ||        \
+    !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) ||    \
+    !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_MD_C and/or MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_RSA_C and/or MBEDTLS_SHA256_C and/or "
+           "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
+           "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/md.h"
+#include "mbedtls/rsa.h"
+#include "mbedtls/pk.h"
+
+#include <stdio.h>
+#include <string.h>
+
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    mbedtls_pk_context pk;
+    mbedtls_entropy_context entropy;
+    mbedtls_ctr_drbg_context ctr_drbg;
+    unsigned char hash[32];
+    unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
+    char filename[512];
+    const char *pers = "rsa_sign_pss";
+    size_t olen = 0;
+
+    mbedtls_entropy_init( &entropy );
+    mbedtls_pk_init( &pk );
+    mbedtls_ctr_drbg_init( &ctr_drbg );
+
+    if( argc != 3 )
+    {
+        mbedtls_printf( "usage: rsa_sign_pss <key_file> <filename>\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . 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( "\n  . Reading private key from '%s'", argv[1] );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_pk_parse_keyfile( &pk, argv[1], "" ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Could not read key from '%s'\n", argv[1] );
+        mbedtls_printf( "  ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( !mbedtls_pk_can_do( &pk, MBEDTLS_PK_RSA ) )
+    {
+        mbedtls_printf( " failed\n  ! Key is not an RSA key\n" );
+        goto exit;
+    }
+
+    mbedtls_rsa_set_padding( mbedtls_pk_rsa( pk ), MBEDTLS_RSA_PKCS_V21, MBEDTLS_MD_SHA256 );
+
+    /*
+     * Compute the SHA-256 hash of the input file,
+     * then calculate the RSA signature of the hash.
+     */
+    mbedtls_printf( "\n  . Generating the RSA/SHA-256 signature" );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_md_file(
+                    mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
+                    argv[2], hash ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Could not open or read %s\n\n", argv[2] );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, 0, buf, &olen,
+                         mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_pk_sign returned %d\n\n", ret );
+        goto exit;
+    }
+
+    /*
+     * Write the signature into <filename>.sig
+     */
+    mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
+
+    if( ( f = fopen( filename, "wb+" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not create %s\n\n", filename );
+        goto exit;
+    }
+
+    if( fwrite( buf, 1, olen, f ) != olen )
+    {
+        mbedtls_printf( "failed\n  ! fwrite failed\n\n" );
+        fclose( f );
+        goto exit;
+    }
+
+    fclose( f );
+
+    mbedtls_printf( "\n  . Done (created \"%s\")\n\n", filename );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+    mbedtls_pk_free( &pk );
+    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_RSA_C &&
+          MBEDTLS_SHA256_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
+          MBEDTLS_CTR_DRBG_C */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_verify.c b/lib/mbedtls-2.27.0/programs/pkey/rsa_verify.c
new file mode 100644
index 0000000..fbc0779
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_verify.c
@@ -0,0 +1,166 @@
+/*
+ *  RSA/SHA-256 signature verification 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_snprintf        snprintf
+#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_RSA_C) ||  \
+    !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \
+    !defined(MBEDTLS_FS_IO)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
+            "MBEDTLS_MD_C and/or "
+            "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/rsa.h"
+#include "mbedtls/md.h"
+
+#include <stdio.h>
+#include <string.h>
+
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    unsigned c;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t i;
+    mbedtls_rsa_context rsa;
+    unsigned char hash[32];
+    unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
+    char filename[512];
+
+    mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
+
+    if( argc != 2 )
+    {
+        mbedtls_printf( "usage: rsa_verify <filename>\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Reading public key from rsa_pub.txt" );
+    fflush( stdout );
+
+    if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
+    {
+        mbedtls_printf( " failed\n  ! Could not open rsa_pub.txt\n" \
+                "  ! Please run rsa_genkey first\n\n" );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
+        ( ret = mbedtls_mpi_read_file( &rsa.E, 16, f ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_mpi_read_file returned %d\n\n", ret );
+        fclose( f );
+        goto exit;
+    }
+
+    rsa.len = ( mbedtls_mpi_bitlen( &rsa.N ) + 7 ) >> 3;
+
+    fclose( f );
+
+    /*
+     * Extract the RSA signature from the text file
+     */
+    mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] );
+
+    if( ( f = fopen( filename, "rb" ) ) == NULL )
+    {
+        mbedtls_printf( "\n  ! Could not open %s\n\n", filename );
+        goto exit;
+    }
+
+    i = 0;
+    while( fscanf( f, "%02X", (unsigned int*) &c ) > 0 &&
+           i < (int) sizeof( buf ) )
+        buf[i++] = (unsigned char) c;
+
+    fclose( f );
+
+    if( i != rsa.len )
+    {
+        mbedtls_printf( "\n  ! Invalid RSA signature format\n\n" );
+        goto exit;
+    }
+
+    /*
+     * Compute the SHA-256 hash of the input file and
+     * verify the signature
+     */
+    mbedtls_printf( "\n  . Verifying the RSA/SHA-256 signature" );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_md_file(
+                    mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
+                    argv[1], hash ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Could not open or read %s\n\n", argv[1] );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_rsa_pkcs1_verify( &rsa, NULL, NULL, MBEDTLS_RSA_PUBLIC,
+                                  MBEDTLS_MD_SHA256, 20, hash, buf ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_rsa_pkcs1_verify returned -0x%0x\n\n", (unsigned int) -ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+
+    mbedtls_rsa_free( &rsa );
+
+#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_RSA_C && MBEDTLS_SHA256_C &&
+          MBEDTLS_FS_IO */
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_verify_pss.c b/lib/mbedtls-2.27.0/programs/pkey/rsa_verify_pss.c
new file mode 100644
index 0000000..81b0fd6
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_verify_pss.c
@@ -0,0 +1,155 @@
+/*
+ *  RSASSA-PSS/SHA-256 signature verification 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_snprintf        snprintf
+#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_MD_C) || !defined(MBEDTLS_ENTROPY_C) ||  \
+    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) ||        \
+    !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) ||    \
+    !defined(MBEDTLS_CTR_DRBG_C)
+int main( void )
+{
+    mbedtls_printf("MBEDTLS_MD_C and/or MBEDTLS_ENTROPY_C and/or "
+           "MBEDTLS_RSA_C and/or MBEDTLS_SHA256_C and/or "
+           "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
+           "MBEDTLS_CTR_DRBG_C not defined.\n");
+    mbedtls_exit( 0 );
+}
+#else
+
+#include "mbedtls/md.h"
+#include "mbedtls/pem.h"
+#include "mbedtls/pk.h"
+#include "mbedtls/md.h"
+
+#include <stdio.h>
+#include <string.h>
+
+
+int main( int argc, char *argv[] )
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t i;
+    mbedtls_pk_context pk;
+    unsigned char hash[32];
+    unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
+    char filename[512];
+
+    mbedtls_pk_init( &pk );
+
+    if( argc != 3 )
+    {
+        mbedtls_printf( "usage: rsa_verify_pss <key_file> <filename>\n" );
+
+#if defined(_WIN32)
+        mbedtls_printf( "\n" );
+#endif
+
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . Reading public key from '%s'", argv[1] );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Could not read key from '%s'\n", argv[1] );
+        mbedtls_printf( "  ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret );
+        goto exit;
+    }
+
+    if( !mbedtls_pk_can_do( &pk, MBEDTLS_PK_RSA ) )
+    {
+        mbedtls_printf( " failed\n  ! Key is not an RSA key\n" );
+        goto exit;
+    }
+
+    mbedtls_rsa_set_padding( mbedtls_pk_rsa( pk ), MBEDTLS_RSA_PKCS_V21, MBEDTLS_MD_SHA256 );
+
+    /*
+     * Extract the RSA signature from the file
+     */
+    mbedtls_snprintf( filename, 512, "%s.sig", argv[2] );
+
+    if( ( f = fopen( filename, "rb" ) ) == NULL )
+    {
+        mbedtls_printf( "\n  ! Could not open %s\n\n", filename );
+        goto exit;
+    }
+
+    i = fread( buf, 1, MBEDTLS_MPI_MAX_SIZE, f );
+
+    fclose( f );
+
+    /*
+     * Compute the SHA-256 hash of the input file and
+     * verify the signature
+     */
+    mbedtls_printf( "\n  . Verifying the RSA/SHA-256 signature" );
+    fflush( stdout );
+
+    if( ( ret = mbedtls_md_file(
+                    mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
+                    argv[2], hash ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! Could not open or read %s\n\n", argv[2] );
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256, hash, 0,
+                           buf, i ) ) != 0 )
+    {
+        mbedtls_printf( " failed\n  ! mbedtls_pk_verify returned %d\n\n", ret );
+        goto exit;
+    }
+
+    mbedtls_printf( "\n  . OK (the signature is valid)\n\n" );
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+    mbedtls_pk_free( &pk );
+
+#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_RSA_C && MBEDTLS_SHA256_C &&
+          MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */