C++ (Cpp) mbedtls_hmac_drbg_random Examples

Example #1

File: hmac_drbg.c Project: hypotext/HMAC-DRBG

/*
 * Checkup routine for HMAC_DRBG with SHA-1
 */
int mbedtls_hmac_drbg_self_test( int verbose )
{
    mbedtls_hmac_drbg_context ctx;
    unsigned char buf[OUTPUT_LEN];
    const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );

    mbedtls_hmac_drbg_init( &ctx );

    /*
     * PR = True
     */
    if( verbose != 0 )
        mbedtls_printf( "  HMAC_DRBG (PR = True) : " );

    test_offset = 0;
    CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
                         hmac_drbg_self_test_entropy, (void *) entropy_pr,
                         NULL, 0 ) );
    mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
    CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
    CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
    CHK( memcmp( buf, result_pr, OUTPUT_LEN ) );
    mbedtls_hmac_drbg_free( &ctx );

    mbedtls_hmac_drbg_free( &ctx );

    if( verbose != 0 )
        mbedtls_printf( "passed\n" );

    /*
     * PR = False
     */
    if( verbose != 0 )
        mbedtls_printf( "  HMAC_DRBG (PR = False) : " );

    mbedtls_hmac_drbg_init( &ctx );

    test_offset = 0;
    CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
                         hmac_drbg_self_test_entropy, (void *) entropy_nopr,
                         NULL, 0 ) );
    CHK( mbedtls_hmac_drbg_reseed( &ctx, NULL, 0 ) );
    CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
    CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
    CHK( memcmp( buf, result_nopr, OUTPUT_LEN ) );
    mbedtls_hmac_drbg_free( &ctx );

    mbedtls_hmac_drbg_free( &ctx );

    if( verbose != 0 )
        mbedtls_printf( "passed\n" );

    if( verbose != 0 )
        mbedtls_printf( "\n" );

    return( 0 );
}

Example #2

File: hmac_drbg.c Project: ARMmbed/mbedtls

int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
{
    int ret;
    FILE *f;
    unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];

    if( ( f = fopen( path, "wb" ) ) == NULL )
        return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );

    if( ( ret = mbedtls_hmac_drbg_random( ctx, buf, sizeof( buf ) ) ) != 0 )
        goto exit;

    if( fwrite( buf, 1, sizeof( buf ), f ) != sizeof( buf ) )
    {
        ret = MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR;
        goto exit;
    }

    ret = 0;

exit:
    fclose( f );
    mbedtls_platform_zeroize( buf, sizeof( buf ) );

    return( ret );
}