mbedtls/programs/random/gen_entropy.c

88 lines
2.2 KiB
C

/**
* \brief Use and generate multiple entropies calls into a file
*
* Copyright (C) 2006-2011, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* 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.
*/
#include "polarssl/config.h"
#include "polarssl/entropy.h"
#include <stdio.h>
#if !defined(POLARSSL_ENTROPY_C)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
printf("POLARSSL_ENTROPY_C not defined.\n");
return( 0 );
}
#else
int main( int argc, char *argv[] )
{
FILE *f;
int i, k, ret;
entropy_context entropy;
unsigned char buf[ENTROPY_BLOCK_SIZE];
if( argc < 2 )
{
fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
return( 1 );
}
if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
{
printf( "failed to open '%s' for writing.\n", argv[0] );
return( 1 );
}
entropy_init( &entropy );
for( i = 0, k = 768; i < k; i++ )
{
ret = entropy_func( &entropy, buf, sizeof( buf ) );
if( ret != 0 )
{
printf("failed!\n");
goto cleanup;
}
fwrite( buf, 1, sizeof( buf ), f );
printf( "Generating 32Mb of data in file '%s'... %04.1f" \
"%% done\r", argv[1], (100 * (float) (i + 1)) / k );
fflush( stdout );
}
ret = 0;
cleanup:
fclose( f );
return( ret );
}
#endif /* POLARSSL_ENTROPY_C */