programs/random/gen_random.c

/**
 *  \brief Generate random data into a file
 *
 *  Copyright (C) 2006-2010, 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/havege.h"
#include <time.h>
#include <stdio.h>

int main( int argc, char *argv[] )
{
    FILE *f;
    time_t t;
    int i, j, k;
    havege_state hs;
    unsigned char buf[1024];

    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 );
    }

    havege_init( &hs );

    t = time( NULL );

    for( i = 0, k = 768; i < k; i++ )
    {
        for( j = 0; j < (int) sizeof( buf ); j++ )
            buf[j] = havege_rand( &hs );

        fwrite( buf, sizeof( buf ), 1, f );

        printf( "Generating 32Mb of data in file '%s'... %04.1f" \
                "%% done\r", argv[1], (100 * (float) (i + 1)) / k );
        fflush( stdout );
    }

    if( t == time( NULL ) )
        t--;

    fclose( f );
    return( 0 );
}