mbedtls/programs/random/gen_random_havege.c

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/**
* \brief Generate random data into a file
*
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* Copyright (C) 2006-2011, 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(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#include <stdio.h>
#define polarssl_fprintf fprintf
#define polarssl_printf printf
#endif
#if defined(POLARSSL_HAVEGE_C) && defined(POLARSSL_FS_IO)
#include "polarssl/havege.h"
#include <stdio.h>
#include <time.h>
#endif
#if !defined(POLARSSL_HAVEGE_C) || !defined(POLARSSL_FS_IO)
int main( void )
{
polarssl_printf("POLARSSL_HAVEGE_C not defined.\n");
return( 0 );
}
#else
int main( int argc, char *argv[] )
{
FILE *f;
time_t t;
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int i, k, ret = 0;
havege_state hs;
unsigned char buf[1024];
if( argc < 2 )
{
polarssl_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
return( 1 );
}
if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
{
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polarssl_printf( "failed to open '%s' for writing.\n", argv[1] );
return( 1 );
}
havege_init( &hs );
t = time( NULL );
for( i = 0, k = 768; i < k; i++ )
{
if( havege_random( &hs, buf, sizeof( buf ) ) != 0 )
{
polarssl_printf( "Failed to get random from source.\n" );
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ret = 1;
goto exit;
}
fwrite( buf, sizeof( buf ), 1, f );
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polarssl_printf( "Generating %ldkb of data in file '%s'... %04.1f" \
"%% done\r", (long)(sizeof(buf) * k / 1024), argv[1], (100 * (float) (i + 1)) / k );
fflush( stdout );
}
if( t == time( NULL ) )
t--;
polarssl_printf(" \n ");
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exit:
havege_free( &hs );
fclose( f );
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return( ret );
}
#endif /* POLARSSL_HAVEGE_C */