2 * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include "../testutil.h"
13 * This is an implementation of the algorithm used by the GNU C library's
14 * random(3) pseudorandom number generator as described:
15 * https://www.mscs.dal.ca/~selinger/random/
17 static uint32_t test_random_state[31];
19 uint32_t test_random(void) {
20 static unsigned int pos = 3;
24 test_random_state[pos] += test_random_state[(pos + 28) % 31];
25 return test_random_state[pos++] / 2;
28 void test_random_seed(uint32_t sd) {
31 const unsigned int mod = (1u << 31) - 1;
33 test_random_state[0] = sd;
34 for (i = 1; i < 31; i++) {
35 s = (int32_t)test_random_state[i - 1];
36 test_random_state[i] = (uint32_t)((16807 * (int64_t)s) % mod);
38 for (i = 34; i < 344; i++)