98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/**
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* \brief Use and generate multiple entropies calls into a file
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*
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* Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#define mbedtls_fprintf fprintf
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#define mbedtls_printf printf
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#endif
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#if defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO)
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#include "mbedtls/entropy.h"
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#include <stdio.h>
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#endif
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#if !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO)
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int main( void )
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{
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mbedtls_printf("MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO not defined.\n");
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return( 0 );
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}
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#else
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int main( int argc, char *argv[] )
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{
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FILE *f;
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int i, k, ret;
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mbedtls_entropy_context entropy;
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
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if( argc < 2 )
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{
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mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
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return( 1 );
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}
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if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
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{
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mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
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return( 1 );
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}
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mbedtls_entropy_init( &entropy );
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for( i = 0, k = 768; i < k; i++ )
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{
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ret = mbedtls_entropy_func( &entropy, buf, sizeof( buf ) );
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if( ret != 0 )
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{
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mbedtls_printf("failed!\n");
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goto cleanup;
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}
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fwrite( buf, 1, sizeof( buf ), f );
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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 );
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fflush( stdout );
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}
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ret = 0;
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cleanup:
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mbedtls_printf( "\n" );
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fclose( f );
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mbedtls_entropy_free( &entropy );
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return( ret );
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}
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#endif /* MBEDTLS_ENTROPY_C */
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