C++ (Cpp) ctr_drbg_write_seed_file Examples

Example #1

File: ctr_drbg.c Project: azazel7/chiffreur

int ctr_drbg_update_seed_file( ctr_drbg_context *ctx, const char *path )
{
    FILE *f;
    size_t n;
    unsigned char buf[ CTR_DRBG_MAX_INPUT ];

    if( ( f = fopen( path, "rb" ) ) == NULL )
        return( POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR );

    fseek( f, 0, SEEK_END );
    n = (size_t) ftell( f );
    fseek( f, 0, SEEK_SET );

    if( n > CTR_DRBG_MAX_INPUT )
        return( POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG );

    if( fread( buf, 1, n, f ) != n )
    {
        fclose( f );
        return( POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR );
    }

    ctr_drbg_update( ctx, buf, n );
    
    fclose( f );
    
    return( ctr_drbg_write_seed_file( ctx, path ) );
}

Example #2

File: gen_random_ctr_drbg.c Project: BenKoerber/clearskies_core

int main( int argc, char *argv[] )
{
    FILE *f;
    int i, k, ret;
    ctr_drbg_context ctr_drbg;
    entropy_context entropy;
    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 );
    }

    entropy_init( &entropy );
    ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy, (const unsigned char *) "RANDOM_GEN", 10 );
    if( ret != 0 )
    {
        printf( "failed in ctr_drbg_init: %d\n", ret );
        goto cleanup;
    }
    ctr_drbg_set_prediction_resistance( &ctr_drbg, CTR_DRBG_PR_OFF );

#if defined(POLARSSL_FS_IO)
    ret = ctr_drbg_update_seed_file( &ctr_drbg, "seedfile" );

    if( ret == POLARSSL_ERR_CTR_DRBG_FILE_IO_ERROR )
    {
        printf( "Failed to open seedfile. Generating one.\n" );
        ret = ctr_drbg_write_seed_file( &ctr_drbg, "seedfile" );
        if( ret != 0 )
        {
            printf( "failed in ctr_drbg_write_seed_file: %d\n", ret );
            goto cleanup;
        }
    }
    else if( ret != 0 )
    {
        printf( "failed in ctr_drbg_update_seed_file: %d\n", ret );
        goto cleanup;
    }
#endif

    for( i = 0, k = 768; i < k; i++ )
    {
        ret = ctr_drbg_random( &ctr_drbg, 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:
    printf("\n");

    fclose( f );
    entropy_free( &entropy );

    return( ret );
}