mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-27 18:44:27 +01:00
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/**
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* \file random.c
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*
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* \brief This file contains the helper functions to generate random numbers
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* for the purpose of testing.
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* for arc4random_buf() from <stdlib.h>
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*/
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#if defined(__NetBSD__)
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#define _NETBSD_SOURCE 1
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#elif defined(__OpenBSD__)
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#define _BSD_SOURCE 1
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#endif
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#include <test/macros.h>
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#include <test/random.h>
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#include <string.h>
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int mbedtls_test_rnd_std_rand( void *rng_state,
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unsigned char *output,
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size_t len )
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{
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#if !defined(__OpenBSD__) && !defined(__NetBSD__)
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size_t i;
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if( rng_state != NULL )
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rng_state = NULL;
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for( i = 0; i < len; ++i )
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output[i] = rand();
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#else
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if( rng_state != NULL )
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rng_state = NULL;
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arc4random_buf( output, len );
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#endif /* !OpenBSD && !NetBSD */
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return( 0 );
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}
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int mbedtls_test_rnd_zero_rand( void *rng_state,
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unsigned char *output,
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size_t len )
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{
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if( rng_state != NULL )
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rng_state = NULL;
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memset( output, 0, len );
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return( 0 );
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}
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int mbedtls_test_rnd_buffer_rand( void *rng_state,
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unsigned char *output,
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size_t len )
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{
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mbedtls_test_rnd_buf_info *info = (mbedtls_test_rnd_buf_info *) rng_state;
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size_t use_len;
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if( rng_state == NULL )
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return( mbedtls_test_rnd_std_rand( NULL, output, len ) );
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use_len = len;
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if( len > info->length )
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use_len = info->length;
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if( use_len )
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{
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memcpy( output, info->buf, use_len );
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info->buf += use_len;
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info->length -= use_len;
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}
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if( len - use_len > 0 )
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return( mbedtls_test_rnd_std_rand( NULL, output + use_len,
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len - use_len ) );
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return( 0 );
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}
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int mbedtls_test_rnd_pseudo_rand( void *rng_state,
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unsigned char *output,
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size_t len )
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{
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mbedtls_test_rnd_pseudo_info *info =
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(mbedtls_test_rnd_pseudo_info *) rng_state;
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uint32_t i, *k, sum, delta=0x9E3779B9;
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unsigned char result[4], *out = output;
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if( rng_state == NULL )
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return( mbedtls_test_rnd_std_rand( NULL, output, len ) );
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k = info->key;
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while( len > 0 )
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{
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size_t use_len = ( len > 4 ) ? 4 : len;
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sum = 0;
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for( i = 0; i < 32; i++ )
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{
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info->v0 += ( ( ( info->v1 << 4 ) ^ ( info->v1 >> 5 ) )
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+ info->v1 ) ^ ( sum + k[sum & 3] );
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sum += delta;
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info->v1 += ( ( ( info->v0 << 4 ) ^ ( info->v0 >> 5 ) )
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+ info->v0 ) ^ ( sum + k[( sum>>11 ) & 3] );
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}
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PUT_UINT32_BE( info->v0, result, 0 );
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memcpy( out, result, use_len );
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len -= use_len;
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out += 4;
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}
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return( 0 );
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}
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