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/**
* \file random.c
*
* \brief This file contains the helper functions to generate random numbers
* for the purpose of testing.
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* for arc4random_buf() from <stdlib.h>
*/
#if defined(__NetBSD__)
#define _NETBSD_SOURCE 1
#elif defined(__OpenBSD__)
#define _BSD_SOURCE 1
#endif
#include <test/macros.h>
#include <test/random.h>
#include <string.h>
#include <mbedtls/entropy.h>
int mbedtls_test_rnd_std_rand( void *rng_state,
unsigned char *output,
size_t len )
{
#if !defined(__OpenBSD__) && !defined(__NetBSD__)
size_t i;
if( rng_state != NULL )
rng_state = NULL;
for( i = 0; i < len; ++i )
output[i] = rand();
#else
if( rng_state != NULL )
rng_state = NULL;
arc4random_buf( output, len );
#endif /* !OpenBSD && !NetBSD */
return( 0 );
}
int mbedtls_test_rnd_zero_rand( void *rng_state,
unsigned char *output,
size_t len )
{
if( rng_state != NULL )
rng_state = NULL;
memset( output, 0, len );
return( 0 );
}
int mbedtls_test_rnd_buffer_rand( void *rng_state,
unsigned char *output,
size_t len )
{
mbedtls_test_rnd_buf_info *info = (mbedtls_test_rnd_buf_info *) rng_state;
size_t use_len;
if( rng_state == NULL )
return( mbedtls_test_rnd_std_rand( NULL, output, len ) );
use_len = len;
if( len > info->length )
use_len = info->length;
if( use_len )
{
memcpy( output, info->buf, use_len );
info->buf += use_len;
info->length -= use_len;
}
if( len - use_len > 0 )
{
if( info->fallback_f_rng != NULL )
{
return( info->fallback_f_rng( info->fallback_p_rng,
output + use_len,
len - use_len ) );
}
else
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
}
return( 0 );
}
int mbedtls_test_rnd_pseudo_rand( void *rng_state,
unsigned char *output,
size_t len )
{
mbedtls_test_rnd_pseudo_info *info =
(mbedtls_test_rnd_pseudo_info *) rng_state;
uint32_t i, *k, sum, delta=0x9E3779B9;
unsigned char result[4], *out = output;
if( rng_state == NULL )
return( mbedtls_test_rnd_std_rand( NULL, output, len ) );
k = info->key;
while( len > 0 )
{
size_t use_len = ( len > 4 ) ? 4 : len;
sum = 0;
for( i = 0; i < 32; i++ )
{
info->v0 += ( ( ( info->v1 << 4 ) ^ ( info->v1 >> 5 ) )
+ info->v1 ) ^ ( sum + k[sum & 3] );
sum += delta;
info->v1 += ( ( ( info->v0 << 4 ) ^ ( info->v0 >> 5 ) )
+ info->v0 ) ^ ( sum + k[( sum>>11 ) & 3] );
}
PUT_UINT32_BE( info->v0, result, 0 );
memcpy( out, result, use_len );
len -= use_len;
out += 4;
}
return( 0 );
}
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