mbedtls/programs/random/gen_entropy.c

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/**
* \brief Use and generate multiple entropies calls into a file
*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
*
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* This file is part of mbed TLS (https://tls.mbed.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
#else
#include <stdio.h>
#define mbedtls_fprintf fprintf
#define mbedtls_printf printf
#endif
#if defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO)
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#include "mbedtls/entropy.h"
#include <stdio.h>
#endif
#if !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO)
int main( void )
{
mbedtls_printf("MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
return( 0 );
}
#else
int main( int argc, char *argv[] )
{
FILE *f;
int i, k, ret;
mbedtls_entropy_context entropy;
unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
if( argc < 2 )
{
mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
return( 1 );
}
if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
{
mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
return( 1 );
}
mbedtls_entropy_init( &entropy );
for( i = 0, k = 768; i < k; i++ )
{
ret = mbedtls_entropy_func( &entropy, buf, sizeof( buf ) );
if( ret != 0 )
{
mbedtls_printf("failed!\n");
goto cleanup;
}
fwrite( buf, 1, sizeof( buf ), f );
mbedtls_printf( "Generating %ldkb of data in file '%s'... %04.1f" \
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"%% done\r", (long)(sizeof(buf) * k / 1024), argv[1], (100 * (float) (i + 1)) / k );
fflush( stdout );
}
ret = 0;
cleanup:
mbedtls_printf( "\n" );
fclose( f );
mbedtls_entropy_free( &entropy );
return( ret );
}
#endif /* MBEDTLS_ENTROPY_C */