yuzu/externals/mbedtls/programs/random/gen_random_ctr_drbg.c

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2020-12-28 19:15:37 +04:00
/**
* \brief Use and generate random data into a file via the CTR_DBRG based on AES
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: GPL-2.0
*
* 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.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_fprintf fprintf
#define mbedtls_printf printf
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif /* MBEDTLS_PLATFORM_C */
#if defined(MBEDTLS_CTR_DRBG_C) && defined(MBEDTLS_ENTROPY_C) && \
defined(MBEDTLS_FS_IO)
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include <stdio.h>
#endif
#if !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_ENTROPY_C) || \
!defined(MBEDTLS_FS_IO)
int main( void )
{
mbedtls_printf("MBEDTLS_CTR_DRBG_C and/or 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 = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_entropy_context entropy;
unsigned char buf[1024];
mbedtls_ctr_drbg_init( &ctr_drbg );
if( argc < 2 )
{
mbedtls_fprintf( stderr, "usage: %s <output filename>\n", argv[0] );
return( exit_code );
}
if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
{
mbedtls_printf( "failed to open '%s' for writing.\n", argv[1] );
return( exit_code );
}
mbedtls_entropy_init( &entropy );
ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *) "RANDOM_GEN", 10 );
if( ret != 0 )
{
mbedtls_printf( "failed in mbedtls_ctr_drbg_seed: %d\n", ret );
goto cleanup;
}
mbedtls_ctr_drbg_set_prediction_resistance( &ctr_drbg, MBEDTLS_CTR_DRBG_PR_OFF );
#if defined(MBEDTLS_FS_IO)
ret = mbedtls_ctr_drbg_update_seed_file( &ctr_drbg, "seedfile" );
if( ret == MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR )
{
mbedtls_printf( "Failed to open seedfile. Generating one.\n" );
ret = mbedtls_ctr_drbg_write_seed_file( &ctr_drbg, "seedfile" );
if( ret != 0 )
{
mbedtls_printf( "failed in mbedtls_ctr_drbg_write_seed_file: %d\n", ret );
goto cleanup;
}
}
else if( ret != 0 )
{
mbedtls_printf( "failed in mbedtls_ctr_drbg_update_seed_file: %d\n", ret );
goto cleanup;
}
#endif
for( i = 0, k = 768; i < k; i++ )
{
ret = mbedtls_ctr_drbg_random( &ctr_drbg, 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" \
"%% done\r", (long)(sizeof(buf) * k / 1024), argv[1], (100 * (float) (i + 1)) / k );
fflush( stdout );
}
exit_code = MBEDTLS_EXIT_SUCCESS;
cleanup:
mbedtls_printf("\n");
fclose( f );
mbedtls_ctr_drbg_free( &ctr_drbg );
mbedtls_entropy_free( &entropy );
return( exit_code );
}
#endif /* MBEDTLS_CTR_DRBG_C && MBEDTLS_ENTROPY_C */