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.

1 files changed, 1112 insertions, 0 deletions

diff --git a/lib/mbedtls-2.27.0/programs/ssl/ssl_context_info.c b/lib/mbedtls-2.27.0/programs/ssl/ssl_context_info.c
new file mode 100644
index 0000000..a204d9e
--- /dev/null
+++ b/lib/mbedtls-2.27.0/programs/ssl/ssl_context_info.c
@@ -0,0 +1,1112 @@
+/*
+ *  MbedTLS SSL context deserializer from base64 code
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#if !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_ERROR_C) || \
+    !defined(MBEDTLS_SSL_TLS_C)
+int main( void )
+{
+    printf("MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_ERROR_C and/or "
+           "MBEDTLS_SSL_TLS_C not defined.\n");
+    return( 0 );
+}
+#else
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_DEPRECATE)
+#define _CRT_SECURE_NO_DEPRECATE 1
+#endif
+
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <time.h>
+#include "mbedtls/ssl.h"
+#include "mbedtls/error.h"
+#include "mbedtls/base64.h"
+#include "mbedtls/md.h"
+#include "mbedtls/md_internal.h"
+#include "mbedtls/x509_crt.h"
+#include "mbedtls/ssl_ciphersuites.h"
+
+/*
+ * This program version
+ */
+#define PROG_NAME "ssl_context_info"
+#define VER_MAJOR 0
+#define VER_MINOR 1
+
+/*
+ * Flags copied from the Mbed TLS library.
+ */
+#define SESSION_CONFIG_TIME_BIT          ( 1 << 0 )
+#define SESSION_CONFIG_CRT_BIT           ( 1 << 1 )
+#define SESSION_CONFIG_CLIENT_TICKET_BIT ( 1 << 2 )
+#define SESSION_CONFIG_MFL_BIT           ( 1 << 3 )
+#define SESSION_CONFIG_TRUNC_HMAC_BIT    ( 1 << 4 )
+#define SESSION_CONFIG_ETM_BIT           ( 1 << 5 )
+#define SESSION_CONFIG_TICKET_BIT        ( 1 << 6 )
+
+#define CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT    ( 1 << 0 )
+#define CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT     ( 1 << 1 )
+#define CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT      ( 1 << 2 )
+#define CONTEXT_CONFIG_ALPN_BIT                  ( 1 << 3 )
+
+#define TRANSFORM_RANDBYTE_LEN  64
+
+/*
+ * Minimum and maximum number of bytes for specific data: context, sessions,
+ * certificates, tickets and buffers in the program. The context and session
+ * size values have been calculated based on the 'print_deserialized_ssl_context()'
+ * and 'print_deserialized_ssl_session()' content.
+ */
+#define MIN_CONTEXT_LEN     84
+#define MIN_SESSION_LEN     88
+
+#define MAX_CONTEXT_LEN     875     /* without session data */
+#define MAX_SESSION_LEN     109     /* without certificate and ticket data */
+#define MAX_CERTIFICATE_LEN ( ( 1 << 24 ) - 1 )
+#define MAX_TICKET_LEN      ( ( 1 << 24 ) - 1 )
+
+#define MIN_SERIALIZED_DATA ( MIN_CONTEXT_LEN + MIN_SESSION_LEN )
+#define MAX_SERIALIZED_DATA ( MAX_CONTEXT_LEN + MAX_SESSION_LEN + \
+                              MAX_CERTIFICATE_LEN + MAX_TICKET_LEN )
+
+#define MIN_BASE64_LEN      ( MIN_SERIALIZED_DATA * 4 / 3 )
+#define MAX_BASE64_LEN      ( MAX_SERIALIZED_DATA * 4 / 3 + 3 )
+
+/*
+ * A macro that prevents from reading out of the ssl buffer range.
+ */
+#define CHECK_SSL_END( LEN )            \
+do                                      \
+{                                       \
+    if( end - ssl < (int)( LEN ) )      \
+    {                                   \
+        printf_err( "%s", buf_ln_err ); \
+        return;                         \
+    }                                   \
+} while( 0 )
+
+/*
+ * Global values
+ */
+FILE *b64_file = NULL;                  /* file with base64 codes to deserialize */
+char conf_keep_peer_certificate = 1;    /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE from mbedTLS configuration */
+char conf_dtls_proto = 1;               /* MBEDTLS_SSL_PROTO_DTLS from mbedTLS configuration */
+char debug = 0;                         /* flag for debug messages */
+const char alloc_err[] = "Cannot allocate memory\n";
+const char buf_ln_err[] = "Buffer does not have enough data to complete the parsing\n";
+
+/*
+ * Basic printing functions
+ */
+void print_version( )
+{
+    printf( "%s v%d.%d\n", PROG_NAME, VER_MAJOR, VER_MINOR );
+}
+
+void print_usage( )
+{
+    print_version();
+    printf( "\nThis program is used to deserialize an Mbed TLS SSL session from the base64 code provided\n"
+            "in the text file. The program can deserialize many codes from one file, but they must be\n"
+            "separated, e.g. by a newline.\n\n" );
+    printf(
+        "Usage:\n"
+        "\t-f path            - Path to the file with base64 code\n"
+        "\t-v                 - Show version\n"
+        "\t-h                 - Show this usage\n"
+        "\t-d                 - Print more information\n"
+        "\t--keep-peer-cert=0 - Use this option if you know that the Mbed TLS library\n"
+        "\t                     has been compiled with the MBEDTLS_SSL_KEEP_PEER_CERTIFICATE\n"
+        "\t                     flag. You can also use it if there are some problems with reading\n"
+        "\t                     the information about certificate\n"
+        "\t--dtls-protocol=0  - Use this option if you know that the Mbed TLS library\n"
+        "\t                     has been compiled without the MBEDTLS_SSL_PROTO_DTLS flag\n"
+        "\n"
+    );
+}
+
+void printf_dbg( const char *str, ... )
+{
+    if( debug )
+    {
+        va_list args;
+        va_start( args, str );
+        printf( "debug: " );
+        vprintf( str, args );
+        fflush( stdout );
+        va_end( args );
+    }
+}
+
+void printf_err( const char *str, ... )
+{
+    va_list args;
+    va_start( args, str );
+    fflush( stdout );
+    fprintf( stderr, "ERROR: " );
+    vfprintf( stderr, str, args );
+    fflush( stderr );
+    va_end( args );
+}
+
+/*
+ * Exit from the program in case of error
+ */
+void error_exit()
+{
+    if( NULL != b64_file )
+    {
+        fclose( b64_file );
+    }
+    exit( -1 );
+}
+
+/*
+ * This function takes the input arguments of this program
+ */
+void parse_arguments( int argc, char *argv[] )
+{
+    int i = 1;
+
+    if( argc < 2 )
+    {
+        print_usage();
+        error_exit();
+    }
+
+    while( i < argc )
+    {
+        if( strcmp( argv[i], "-d" ) == 0 )
+        {
+            debug = 1;
+        }
+        else if( strcmp( argv[i], "-h" ) == 0 )
+        {
+            print_usage();
+        }
+        else if( strcmp( argv[i], "-v" ) == 0 )
+        {
+            print_version();
+        }
+        else if( strcmp( argv[i], "-f" ) == 0 )
+        {
+            if( ++i >= argc )
+            {
+                printf_err( "File path is empty\n" );
+                error_exit();
+            }
+
+            if( ( b64_file = fopen( argv[i], "r" ) ) == NULL )
+            {
+                printf_err( "Cannot find file \"%s\"\n", argv[i] );
+                error_exit();
+            }
+        }
+        else if( strcmp( argv[i], "--keep-peer-cert=0" ) == 0 )
+        {
+            conf_keep_peer_certificate = 0;
+        }
+        else if( strcmp( argv[i], "--dtls-protocol=0" ) == 0 )
+        {
+            conf_dtls_proto = 0;
+        }
+        else
+        {
+            print_usage();
+            error_exit();
+        }
+
+        i++;
+    }
+}
+
+/*
+ * This function prints base64 code to the stdout
+ */
+void print_b64( const uint8_t *b, size_t len )
+{
+    size_t i = 0;
+    const uint8_t *end = b + len;
+    printf("\t");
+    while( b < end )
+    {
+        if( ++i > 75 )
+        {
+            printf( "\n\t" );
+            i = 0;
+        }
+        printf( "%c", *b++ );
+    }
+    printf( "\n" );
+    fflush( stdout );
+}
+
+/*
+ * This function prints hex code from the buffer to the stdout.
+ *
+ * /p b         buffer with data to print
+ * /p len       number of bytes to print
+ * /p in_line   number of bytes in one line
+ * /p prefix    prefix for the new lines
+ */
+void print_hex( const uint8_t *b, size_t len,
+                const size_t in_line, const char *prefix )
+{
+    size_t i = 0;
+    const uint8_t *end = b + len;
+
+    if( prefix == NULL )
+    {
+        prefix = "";
+    }
+
+    while( b < end )
+    {
+        if( ++i > in_line )
+        {
+            printf( "\n%s", prefix );
+            i = 1;
+        }
+        printf( "%02X ", (uint8_t) *b++ );
+    }
+    printf("\n");
+    fflush(stdout);
+}
+
+/*
+ *  Print the value of time_t in format e.g. 2020-01-23 13:05:59
+ */
+void print_time( const time_t *time )
+{
+    char buf[20];
+    struct tm *t = gmtime( time );
+    static const char format[] = "%Y-%m-%d %H:%M:%S";
+    if( NULL != t )
+    {
+        strftime( buf, sizeof( buf ), format, t );
+        printf( "%s\n", buf );
+    }
+    else
+    {
+        printf( "unknown\n" );
+    }
+}
+
+/*
+ * Print the input string if the bit is set in the value
+ */
+void print_if_bit( const char *str, int bit, int val )
+{
+    if( bit & val )
+    {
+        printf( "\t%s\n", str );
+    }
+}
+
+/*
+ * Return pointer to hardcoded "enabled" or "disabled" depending on the input value
+ */
+const char * get_enabled_str( int is_en )
+{
+    return ( is_en ) ? "enabled" : "disabled";
+}
+
+/*
+ * Return pointer to hardcoded MFL string value depending on the MFL code at the input
+ */
+const char * get_mfl_str( int mfl_code )
+{
+    switch( mfl_code )
+    {
+        case MBEDTLS_SSL_MAX_FRAG_LEN_NONE:
+            return "none";
+        case MBEDTLS_SSL_MAX_FRAG_LEN_512:
+            return "512";
+        case MBEDTLS_SSL_MAX_FRAG_LEN_1024:
+            return "1024";
+        case MBEDTLS_SSL_MAX_FRAG_LEN_2048:
+            return "2048";
+        case MBEDTLS_SSL_MAX_FRAG_LEN_4096:
+            return "4096";
+        default:
+            return "error";
+    }
+}
+
+/*
+ * Read next base64 code from the 'b64_file'. The 'b64_file' must be opened
+ * previously. After each call to this function, the internal file position
+ * indicator of the global b64_file is advanced.
+ *
+ * Note - This function checks the size of the input buffer and if necessary,
+ *        increases it to the maximum MAX_BASE64_LEN
+ *
+ * /p b64       pointer to the pointer of the buffer for input data
+ * /p max_len   pointer to the current buffer capacity. It can be changed if
+ *              the buffer needs to be increased
+ *
+ * \retval      number of bytes written in to the b64 buffer or 0 in case no more
+ *              data was found
+ */
+size_t read_next_b64_code( uint8_t **b64, size_t *max_len )
+{
+    int valid_balance = 0;  /* balance between valid and invalid characters */
+    size_t len = 0;
+    char pad = 0;
+    int c = 0;
+
+    while( EOF != c )
+    {
+        char c_valid = 0;
+
+        c = fgetc( b64_file );
+
+        if( pad > 0 )
+        {
+            if( c == '=' && pad == 1 )
+            {
+                c_valid = 1;
+                pad = 2;
+            }
+        }
+        else if( ( c >= 'A' && c <= 'Z' ) ||
+                 ( c >= 'a' && c <= 'z' ) ||
+                 ( c >= '0' && c <= '9' ) ||
+                   c == '+' || c == '/' )
+        {
+            c_valid = 1;
+        }
+        else if( c == '=' )
+        {
+            c_valid = 1;
+            pad = 1;
+        }
+        else if( c == '-' )
+        {
+            c = '+';
+            c_valid = 1;
+        }
+        else if( c == '_' )
+        {
+            c = '/';
+            c_valid = 1;
+        }
+
+        if( c_valid )
+        {
+            /* A string of characters that could be a base64 code. */
+            valid_balance++;
+
+            if( len < *max_len )
+            {
+                ( *b64 )[ len++ ] = c;
+            }
+            else if( *max_len < MAX_BASE64_LEN )
+            {
+                /* Current buffer is too small, but can be resized. */
+                void *ptr;
+                size_t new_size = ( MAX_BASE64_LEN - 4096 > *max_len ) ?
+                                  *max_len + 4096 : MAX_BASE64_LEN;
+
+                ptr = realloc( *b64, new_size );
+                if( NULL == ptr )
+                {
+                    printf_err( alloc_err );
+                    return 0;
+                }
+                *b64 = ptr;
+                *max_len = new_size;
+                ( *b64 )[ len++ ] = c;
+            }
+            else
+            {
+                /* Too much data so it will be treated as invalid */
+                len++;
+            }
+        }
+        else if( len > 0 )
+        {
+            /* End of a string that could be a base64 code, but need to check
+             * that the length of the characters is correct. */
+
+            valid_balance--;
+
+            if( len < MIN_CONTEXT_LEN )
+            {
+                printf_dbg( "The code found is too small to be a SSL context.\n" );
+                len = pad = 0;
+            }
+            else if( len > *max_len )
+            {
+                printf_err( "The code found is too large by %u bytes.\n", len - *max_len );
+                len = pad = 0;
+            }
+            else if( len % 4 != 0 )
+            {
+                printf_err( "The length of the base64 code found should be a multiple of 4.\n" );
+                len = pad = 0;
+            }
+            else
+            {
+                /* Base64 code with valid character length. */
+                return len;
+            }
+        }
+        else
+        {
+            valid_balance--;
+        }
+
+        /* Detection of potentially wrong file format like: binary, zip, ISO, etc. */
+        if( valid_balance < -100 )
+        {
+            printf_err( "Too many bad symbols detected. File check aborted.\n" );
+            return 0;
+        }
+    }
+
+    printf_dbg( "End of file\n" );
+    return 0;
+}
+
+/*
+ * This function deserializes and prints to the stdout all obtained information
+ * about the certificates from provided data.
+ *
+ * /p ssl   pointer to serialized certificate
+ * /p len   number of bytes in the buffer
+*/
+void print_deserialized_ssl_cert( const uint8_t *ssl, uint32_t len )
+{
+    enum { STRLEN = 4096 };
+    mbedtls_x509_crt crt;
+    int ret;
+    char str[STRLEN];
+
+    printf( "\nCertificate:\n" );
+
+    mbedtls_x509_crt_init( &crt );
+    ret = mbedtls_x509_crt_parse_der( &crt, ssl, len );
+    if( 0 != ret )
+    {
+        mbedtls_strerror( ret, str, STRLEN );
+        printf_err( "Invalid format of X.509 - %s\n", str );
+        printf( "Cannot deserialize:\n\t" );
+        print_hex( ssl, len, 25, "\t" );
+    }
+    else
+    {
+        mbedtls_x509_crt *current = &crt;
+
+        while( current != NULL )
+        {
+            ret = mbedtls_x509_crt_info( str, STRLEN, "\t", current );
+            if( 0 > ret )
+            {
+                mbedtls_strerror( ret, str, STRLEN );
+                printf_err( "Cannot write to the output - %s\n", str );
+            }
+            else
+            {
+                printf( "%s", str );
+            }
+
+            current = current->next;
+
+            if( current )
+            {
+                printf( "\n" );
+            }
+
+        }
+    }
+
+   mbedtls_x509_crt_free( &crt );
+}
+
+/*
+ * This function deserializes and prints to the stdout all obtained information
+ * about the session from provided data. This function was built based on
+ * mbedtls_ssl_session_load(). mbedtls_ssl_session_load() could not be used
+ * due to dependencies on the mbedTLS configuration.
+ *
+ * The data structure in the buffer:
+ *  uint64 start_time;
+ *  uint8 ciphersuite[2];        // defined by the standard
+ *  uint8 compression;           // 0 or 1
+ *  uint8 session_id_len;        // at most 32
+ *  opaque session_id[32];
+ *  opaque master[48];           // fixed length in the standard
+ *  uint32 verify_result;
+ *  opaque peer_cert<0..2^24-1>; // length 0 means no peer cert
+ *  opaque ticket<0..2^24-1>;    // length 0 means no ticket
+ *  uint32 ticket_lifetime;
+ *  uint8 mfl_code;              // up to 255 according to standard
+ *  uint8 trunc_hmac;            // 0 or 1
+ *  uint8 encrypt_then_mac;      // 0 or 1
+ *
+ * /p ssl               pointer to serialized session
+ * /p len               number of bytes in the buffer
+ * /p session_cfg_flag  session configuration flags
+ */
+void print_deserialized_ssl_session( const uint8_t *ssl, uint32_t len,
+                                     int session_cfg_flag )
+{
+    const struct mbedtls_ssl_ciphersuite_t * ciphersuite_info;
+    int ciphersuite_id;
+    uint32_t cert_len, ticket_len;
+    uint32_t verify_result, ticket_lifetime;
+    const uint8_t *end = ssl + len;
+
+    printf( "\nSession info:\n" );
+
+    if( session_cfg_flag & SESSION_CONFIG_TIME_BIT )
+    {
+        uint64_t start;
+        CHECK_SSL_END( 8 );
+        start = ( (uint64_t) ssl[0] << 56 ) |
+                ( (uint64_t) ssl[1] << 48 ) |
+                ( (uint64_t) ssl[2] << 40 ) |
+                ( (uint64_t) ssl[3] << 32 ) |
+                ( (uint64_t) ssl[4] << 24 ) |
+                ( (uint64_t) ssl[5] << 16 ) |
+                ( (uint64_t) ssl[6] <<  8 ) |
+                ( (uint64_t) ssl[7] );
+        ssl += 8;
+        printf( "\tstart time     : " );
+        print_time( (time_t*) &start );
+    }
+
+    CHECK_SSL_END( 2 );
+    ciphersuite_id = ( (int) ssl[0] << 8 ) | (int) ssl[1];
+    printf_dbg( "Ciphersuite ID: %d\n", ciphersuite_id );
+    ssl += 2;
+
+    ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuite_id );
+    if( ciphersuite_info == NULL )
+    {
+        printf_err( "Cannot find ciphersuite info\n" );
+    }
+    else
+    {
+        const mbedtls_cipher_info_t *cipher_info;
+        const mbedtls_md_info_t *md_info;
+
+        printf( "\tciphersuite    : %s\n", ciphersuite_info->name );
+        printf( "\tcipher flags   : 0x%02X\n", ciphersuite_info->flags );
+
+        cipher_info = mbedtls_cipher_info_from_type( ciphersuite_info->cipher );
+        if( cipher_info == NULL )
+        {
+            printf_err( "Cannot find cipher info\n" );
+        }
+        else
+        {
+            printf( "\tcipher         : %s\n", cipher_info->name );
+        }
+
+        md_info = mbedtls_md_info_from_type( ciphersuite_info->mac );
+        if( md_info == NULL )
+        {
+            printf_err( "Cannot find Message-Digest info\n" );
+        }
+        else
+        {
+            printf( "\tMessage-Digest : %s\n", md_info->name );
+        }
+    }
+
+    CHECK_SSL_END( 1 );
+    printf( "\tcompression    : %s\n", get_enabled_str( *ssl++ ) );
+
+    /* Note - Here we can get session ID length from serialized data, but we
+     * use hardcoded 32-bytes length. This approach was taken from
+     * 'mbedtls_ssl_session_load()'. */
+    CHECK_SSL_END( 1 + 32 );
+    printf_dbg( "Session id length: %u\n", (uint32_t) *ssl++ );
+    printf( "\tsession ID     : ");
+    print_hex( ssl, 32, 16, "\t                 " );
+    ssl += 32;
+
+    printf( "\tmaster secret  : ");
+    CHECK_SSL_END( 48 );
+    print_hex( ssl, 48, 16, "\t                 " );
+    ssl += 48;
+
+    CHECK_SSL_END( 4 );
+    verify_result = ( (uint32_t) ssl[0] << 24 ) |
+                    ( (uint32_t) ssl[1] << 16 ) |
+                    ( (uint32_t) ssl[2] <<  8 ) |
+                    ( (uint32_t) ssl[3] );
+    ssl += 4;
+    printf( "\tverify result  : 0x%08X\n", verify_result );
+
+    if( SESSION_CONFIG_CRT_BIT & session_cfg_flag )
+    {
+        if( conf_keep_peer_certificate )
+        {
+            CHECK_SSL_END( 3 );
+            cert_len = ( (uint32_t) ssl[0] << 16 ) |
+                       ( (uint32_t) ssl[1] <<  8 ) |
+                       ( (uint32_t) ssl[2] );
+            ssl += 3;
+            printf_dbg( "Certificate length: %u\n", cert_len );
+
+            if( cert_len > 0 )
+            {
+                CHECK_SSL_END( cert_len );
+                print_deserialized_ssl_cert( ssl, cert_len );
+                ssl += cert_len;
+            }
+        }
+        else
+        {
+            printf( "\tPeer digest    : " );
+
+            CHECK_SSL_END( 1 );
+            switch( (mbedtls_md_type_t) *ssl++ )
+            {
+                case MBEDTLS_MD_NONE:
+                    printf( "none\n" );
+                    break;
+                case MBEDTLS_MD_MD2:
+                    printf( "MD2\n" );
+                    break;
+                case MBEDTLS_MD_MD4:
+                    printf( "MD4\n" );
+                    break;
+                case MBEDTLS_MD_MD5:
+                    printf( "MD5\n" );
+                    break;
+                case MBEDTLS_MD_SHA1:
+                    printf( "SHA1\n" );
+                    break;
+                case MBEDTLS_MD_SHA224:
+                    printf( "SHA224\n" );
+                    break;
+                case MBEDTLS_MD_SHA256:
+                    printf( "SHA256\n" );
+                    break;
+                case MBEDTLS_MD_SHA384:
+                    printf( "SHA384\n" );
+                    break;
+                case MBEDTLS_MD_SHA512:
+                    printf( "SHA512\n" );
+                    break;
+                case MBEDTLS_MD_RIPEMD160:
+                    printf( "RIPEMD160\n" );
+                    break;
+                default:
+                    printf( "undefined or erroneous\n" );
+                    break;
+            }
+
+            CHECK_SSL_END( 1 );
+            cert_len  = (uint32_t) *ssl++;
+            printf_dbg( "Message-Digest length: %u\n", cert_len );
+
+            if( cert_len > 0 )
+            {
+                printf( "\tPeer digest cert : " );
+                CHECK_SSL_END( cert_len );
+                print_hex( ssl, cert_len, 16, "\t                   " );
+                ssl += cert_len;
+            }
+        }
+    }
+
+    if( SESSION_CONFIG_CLIENT_TICKET_BIT & session_cfg_flag )
+    {
+        printf( "\nTicket:\n" );
+
+        CHECK_SSL_END( 3 );
+        ticket_len = ( (uint32_t) ssl[0] << 16 ) |
+                     ( (uint32_t) ssl[1] <<  8 ) |
+                     ( (uint32_t) ssl[2] );
+        ssl += 3;
+        printf_dbg( "Ticket length: %u\n", ticket_len );
+
+        if( ticket_len > 0 )
+        {
+            printf( "\t" );
+            CHECK_SSL_END( ticket_len );
+            print_hex( ssl, ticket_len, 22, "\t" );
+            ssl += ticket_len;
+            printf( "\n" );
+        }
+
+        CHECK_SSL_END( 4 );
+        ticket_lifetime = ( (uint32_t) ssl[0] << 24 ) |
+                          ( (uint32_t) ssl[1] << 16 ) |
+                          ( (uint32_t) ssl[2] <<  8 ) |
+                          ( (uint32_t) ssl[3] );
+        ssl += 4;
+        printf( "\tlifetime : %u sec.\n", ticket_lifetime );
+    }
+
+    if( ssl < end )
+    {
+        printf( "\nSession others:\n" );
+    }
+
+    if( SESSION_CONFIG_MFL_BIT & session_cfg_flag )
+    {
+        CHECK_SSL_END( 1 );
+        printf( "\tMFL                      : %s\n", get_mfl_str( *ssl++ ) );
+    }
+
+    if( SESSION_CONFIG_TRUNC_HMAC_BIT & session_cfg_flag )
+    {
+        CHECK_SSL_END( 1 );
+        printf( "\tnegotiate truncated HMAC : %s\n", get_enabled_str( *ssl++ ) );
+    }
+
+    if( SESSION_CONFIG_ETM_BIT & session_cfg_flag )
+    {
+        CHECK_SSL_END( 1 );
+        printf( "\tEncrypt-then-MAC         : %s\n", get_enabled_str( *ssl++ ) );
+    }
+
+    if( 0 != ( end - ssl ) )
+    {
+        printf_err( "%i bytes left to analyze from session\n", (int32_t)( end - ssl ) );
+    }
+}
+
+/*
+ * This function deserializes and prints to the stdout all obtained information
+ * about the context from provided data. This function was built based on
+ * mbedtls_ssl_context_load(). mbedtls_ssl_context_load() could not be used
+ * due to dependencies on the mbedTLS configuration and the configuration of
+ * the context when serialization was created.
+ *
+ * The data structure in the buffer:
+ *  // header
+ *  uint8 version[3];
+ *  uint8 configuration[5];
+ *  // session sub-structure
+ *  uint32_t session_len;
+ *  opaque session<1..2^32-1>;  // see mbedtls_ssl_session_save()
+ *  // transform sub-structure
+ *  uint8 random[64];           // ServerHello.random+ClientHello.random
+ *  uint8 in_cid_len;
+ *  uint8 in_cid<0..2^8-1>      // Connection ID: expected incoming value
+ *  uint8 out_cid_len;
+ *  uint8 out_cid<0..2^8-1>     // Connection ID: outgoing value to use
+ *  // fields from ssl_context
+ *  uint32 badmac_seen;         // DTLS: number of records with failing MAC
+ *  uint64 in_window_top;       // DTLS: last validated record seq_num
+ *  uint64 in_window;           // DTLS: bitmask for replay protection
+ *  uint8 disable_datagram_packing; // DTLS: only one record per datagram
+ *  uint64 cur_out_ctr;         // Record layer: outgoing sequence number
+ *  uint16 mtu;                 // DTLS: path mtu (max outgoing fragment size)
+ *  uint8 alpn_chosen_len;
+ *  uint8 alpn_chosen<0..2^8-1> // ALPN: negotiated application protocol
+ *
+ * /p ssl   pointer to serialized session
+ * /p len   number of bytes in the buffer
+ */
+void print_deserialized_ssl_context( const uint8_t *ssl, size_t len )
+{
+    const uint8_t *end = ssl + len;
+    uint32_t session_len;
+    int session_cfg_flag;
+    int context_cfg_flag;
+
+    printf( "\nMbed TLS version:\n" );
+
+    CHECK_SSL_END( 3 + 2 + 3 );
+
+    printf( "\tmajor    %u\n", (uint32_t) *ssl++ );
+    printf( "\tminor    %u\n", (uint32_t) *ssl++ );
+    printf( "\tpath     %u\n", (uint32_t) *ssl++ );
+
+    printf( "\nEnabled session and context configuration:\n" );
+
+    session_cfg_flag = ( (int) ssl[0] << 8 ) | ( (int) ssl[1] );
+    ssl += 2;
+
+    context_cfg_flag = ( (int) ssl[0] << 16 ) |
+                       ( (int) ssl[1] <<  8 ) |
+                       ( (int) ssl[2] ) ;
+    ssl += 3;
+
+    printf_dbg( "Session config flags 0x%04X\n", session_cfg_flag );
+    printf_dbg( "Context config flags 0x%06X\n", context_cfg_flag );
+
+    print_if_bit( "MBEDTLS_HAVE_TIME", SESSION_CONFIG_TIME_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_X509_CRT_PARSE_C", SESSION_CONFIG_CRT_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_MAX_FRAGMENT_LENGTH", SESSION_CONFIG_MFL_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_TRUNCATED_HMAC", SESSION_CONFIG_TRUNC_HMAC_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_ENCRYPT_THEN_MAC", SESSION_CONFIG_ETM_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_SESSION_TICKETS", SESSION_CONFIG_TICKET_BIT, session_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_SESSION_TICKETS and client", SESSION_CONFIG_CLIENT_TICKET_BIT, session_cfg_flag );
+
+    print_if_bit( "MBEDTLS_SSL_DTLS_CONNECTION_ID", CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT, context_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_DTLS_BADMAC_LIMIT", CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT, context_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_DTLS_ANTI_REPLAY", CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT, context_cfg_flag );
+    print_if_bit( "MBEDTLS_SSL_ALPN", CONTEXT_CONFIG_ALPN_BIT, context_cfg_flag );
+
+    CHECK_SSL_END( 4 );
+    session_len = ( (uint32_t) ssl[0] << 24 ) |
+                  ( (uint32_t) ssl[1] << 16 ) |
+                  ( (uint32_t) ssl[2] <<  8 ) |
+                  ( (uint32_t) ssl[3] );
+    ssl += 4;
+    printf_dbg( "Session length %u\n", session_len );
+
+    CHECK_SSL_END( session_len );
+    print_deserialized_ssl_session( ssl, session_len, session_cfg_flag );
+    ssl += session_len;
+
+    printf( "\nRandom bytes:\n\t");
+
+    CHECK_SSL_END( TRANSFORM_RANDBYTE_LEN );
+    print_hex( ssl, TRANSFORM_RANDBYTE_LEN, 22, "\t" );
+    ssl += TRANSFORM_RANDBYTE_LEN;
+
+    printf( "\nContext others:\n" );
+
+    if( CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT & context_cfg_flag )
+    {
+        uint8_t cid_len;
+
+        CHECK_SSL_END( 1 );
+        cid_len = *ssl++;
+        printf_dbg( "In CID length %u\n", (uint32_t) cid_len );
+
+        printf( "\tin CID                             : " );
+        if( cid_len > 0 )
+        {
+            CHECK_SSL_END( cid_len );
+            print_hex( ssl, cid_len, 20, "\t" );
+            ssl += cid_len;
+        }
+        else
+        {
+            printf( "none\n" );
+        }
+
+        CHECK_SSL_END( 1 );
+        cid_len = *ssl++;
+        printf_dbg( "Out CID length %u\n", (uint32_t) cid_len );
+
+        printf( "\tout CID                            : " );
+        if( cid_len > 0 )
+        {
+            CHECK_SSL_END( cid_len );
+            print_hex( ssl, cid_len, 20, "\t" );
+            ssl += cid_len;
+        }
+        else
+        {
+            printf( "none\n" );
+        }
+    }
+
+    if( CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT & context_cfg_flag )
+    {
+        uint32_t badmac_seen;
+
+        CHECK_SSL_END( 4 );
+        badmac_seen = ( (uint32_t) ssl[0] << 24 ) |
+                      ( (uint32_t) ssl[1] << 16 ) |
+                      ( (uint32_t) ssl[2] <<  8 ) |
+                      ( (uint32_t) ssl[3] );
+        ssl += 4;
+        printf( "\tbad MAC seen number                : %u\n", badmac_seen );
+
+        /* value 'in_window_top' from mbedtls_ssl_context */
+        printf( "\tlast validated record sequence no. : " );
+        CHECK_SSL_END( 8 );
+        print_hex( ssl, 8, 20, "" );
+        ssl += 8;
+
+        /* value 'in_window' from mbedtls_ssl_context */
+        printf( "\tbitmask for replay detection       : " );
+        CHECK_SSL_END( 8 );
+        print_hex( ssl, 8, 20, "" );
+        ssl += 8;
+    }
+
+    if( conf_dtls_proto )
+    {
+        CHECK_SSL_END( 1 );
+        printf( "\tDTLS datagram packing              : %s\n",
+                get_enabled_str( ! ( *ssl++ ) ) );
+    }
+
+    /* value 'cur_out_ctr' from mbedtls_ssl_context */
+    printf( "\toutgoing record sequence no.       : ");
+    CHECK_SSL_END( 8 );
+    print_hex( ssl, 8, 20, "" );
+    ssl += 8;
+
+    if( conf_dtls_proto )
+    {
+        uint16_t mtu;
+        CHECK_SSL_END( 2 );
+        mtu = ( ssl[0] << 8 ) | ssl[1];
+        ssl += 2;
+        printf( "\tMTU                                : %u\n", mtu );
+    }
+
+
+    if( CONTEXT_CONFIG_ALPN_BIT & context_cfg_flag )
+    {
+        uint8_t alpn_len;
+
+        CHECK_SSL_END( 1 );
+        alpn_len = *ssl++;
+        printf_dbg( "ALPN length %u\n", (uint32_t) alpn_len );
+
+        printf( "\tALPN negotiation                   : " );
+        CHECK_SSL_END( alpn_len );
+        if( alpn_len > 0 )
+        {
+            if( strlen( (const char*) ssl ) == alpn_len )
+            {
+                printf( "%s\n", ssl );
+            }
+            else
+            {
+                printf( "\n" );
+                printf_err( "\tALPN negotiation is incorrect\n" );
+            }
+            ssl += alpn_len;
+        }
+        else
+        {
+            printf( "not selected\n" );
+        }
+    }
+
+    if( 0 != ( end - ssl ) )
+    {
+        printf_err( "%i bytes left to analyze from context\n", (int32_t)( end - ssl ) );
+    }
+    printf( "\n" );
+}
+
+int main( int argc, char *argv[] )
+{
+    enum { SSL_INIT_LEN = 4096 };
+
+    uint32_t b64_counter = 0;
+    uint8_t *b64_buf = NULL;
+    uint8_t *ssl_buf = NULL;
+    size_t b64_max_len = SSL_INIT_LEN;
+    size_t ssl_max_len = SSL_INIT_LEN;
+    size_t ssl_len = 0;
+
+     /* The 'b64_file' is opened when parsing arguments to check that the
+      * file name is correct */
+    parse_arguments( argc, argv );
+
+    if( NULL != b64_file )
+    {
+        b64_buf = malloc( SSL_INIT_LEN );
+        ssl_buf = malloc( SSL_INIT_LEN );
+
+        if( NULL == b64_buf || NULL == ssl_buf )
+        {
+            printf_err( alloc_err );
+            fclose( b64_file );
+            b64_file = NULL;
+        }
+    }
+
+    while( NULL != b64_file )
+    {
+        size_t b64_len = read_next_b64_code( &b64_buf, &b64_max_len );
+        if( b64_len > 0)
+        {
+            int ret;
+            size_t ssl_required_len = b64_len * 3 / 4 + 1;
+
+            /* Allocate more memory if necessary. */
+            if( ssl_required_len > ssl_max_len )
+            {
+                void *ptr = realloc( ssl_buf, ssl_required_len );
+                if( NULL == ptr )
+                {
+                    printf_err( alloc_err );
+                    fclose( b64_file );
+                    b64_file = NULL;
+                    break;
+                }
+                ssl_buf = ptr;
+                ssl_max_len = ssl_required_len;
+            }
+
+            printf( "\nDeserializing number %u:\n",  ++b64_counter );
+
+            printf( "\nBase64 code:\n" );
+            print_b64( b64_buf, b64_len );
+
+            ret = mbedtls_base64_decode( ssl_buf, ssl_max_len, &ssl_len, b64_buf, b64_len );
+            if( ret != 0)
+            {
+                mbedtls_strerror( ret, (char*) b64_buf, b64_max_len );
+                printf_err( "base64 code cannot be decoded - %s\n", b64_buf );
+                continue;
+            }
+
+            if( debug )
+            {
+                printf( "\nDecoded data in hex:\n\t");
+                print_hex( ssl_buf, ssl_len, 25, "\t" );
+            }
+
+            print_deserialized_ssl_context( ssl_buf, ssl_len );
+
+        }
+        else
+        {
+            fclose( b64_file );
+            b64_file = NULL;
+        }
+    }
+
+    free( b64_buf );
+    free( ssl_buf );
+
+    if( b64_counter > 0 )
+    {
+        printf_dbg( "Finished. Found %u base64 codes\n", b64_counter );
+    }
+    else
+    {
+        printf( "Finished. No valid base64 code found\n" );
+    }
+
+    return 0;
+}
+
+#endif /* MBEDTLS_X509_CRT_PARSE_C */