mirror of
https://github.com/Mbed-TLS/mbedtls.git
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137 lines
3.1 KiB
C
137 lines
3.1 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 OR GPL-2.0-or-later
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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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#include <mbedtls/entropy.h>
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#include <alignment.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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}
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for (i = 0; i < len; ++i) {
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output[i] = rand();
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}
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#else
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if (rng_state != NULL) {
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rng_state = NULL;
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}
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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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}
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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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}
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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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}
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if (use_len) {
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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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if (info->fallback_f_rng != NULL) {
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return info->fallback_f_rng(info->fallback_p_rng,
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output + use_len,
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len - use_len);
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} else {
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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}
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}
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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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}
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k = info->key;
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while (len > 0) {
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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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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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MBEDTLS_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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