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dis-bench / src /php /php-src /ext /random /engine_xoshiro256starstar.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Go Kudo <zeriyoshi@php.net> |
| |
| Based on code from: David Blackman |
| Sebastiano Vigna <vigna@acm.org> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "php.h"
#include "php_random.h"
#include "php_random_csprng.h"
#include "Zend/zend_exceptions.h"
static inline uint64_t splitmix64(uint64_t *seed)
{
uint64_t r;
r = (*seed += 0x9e3779b97f4a7c15ULL);
r = (r ^ (r >> 30)) * 0xbf58476d1ce4e5b9ULL;
r = (r ^ (r >> 27)) * 0x94d049bb133111ebULL;
return (r ^ (r >> 31));
}
ZEND_ATTRIBUTE_CONST static inline uint64_t rotl(const uint64_t x, int k)
{
return (x << k) | (x >> (64 - k));
}
static inline uint64_t generate_state(php_random_status_state_xoshiro256starstar *s)
{
const uint64_t r = rotl(s->state[1] * 5, 7) * 9;
const uint64_t t = s->state[1] << 17;
s->state[2] ^= s->state[0];
s->state[3] ^= s->state[1];
s->state[1] ^= s->state[2];
s->state[0] ^= s->state[3];
s->state[2] ^= t;
s->state[3] = rotl(s->state[3], 45);
return r;
}
static inline void jump(php_random_status_state_xoshiro256starstar *state, const uint64_t *jmp)
{
uint64_t s0 = 0, s1 = 0, s2 = 0, s3 = 0;
for (uint32_t i = 0; i < 4; i++) {
for (uint32_t j = 0; j < 64; j++) {
if (jmp[i] & 1ULL << j) {
s0 ^= state->state[0];
s1 ^= state->state[1];
s2 ^= state->state[2];
s3 ^= state->state[3];
}
generate_state(state);
}
}
state->state[0] = s0;
state->state[1] = s1;
state->state[2] = s2;
state->state[3] = s3;
}
PHPAPI inline void php_random_xoshiro256starstar_seed256(php_random_status_state_xoshiro256starstar *state, uint64_t s0, uint64_t s1, uint64_t s2, uint64_t s3)
{
state->state[0] = s0;
state->state[1] = s1;
state->state[2] = s2;
state->state[3] = s3;
}
PHPAPI inline void php_random_xoshiro256starstar_seed64(php_random_status_state_xoshiro256starstar *state, uint64_t seed)
{
uint64_t s[4];
s[0] = splitmix64(&seed);
s[1] = splitmix64(&seed);
s[2] = splitmix64(&seed);
s[3] = splitmix64(&seed);
php_random_xoshiro256starstar_seed256(state, s[0], s[1], s[2], s[3]);
}
static php_random_result generate(void *state)
{
return (php_random_result){
.size = sizeof(uint64_t),
.result = generate_state(state),
};
}
static zend_long range(void *state, zend_long min, zend_long max)
{
return php_random_range((php_random_algo_with_state){
.algo = &php_random_algo_xoshiro256starstar,
.state = state,
}, min, max);
}
static bool serialize(void *state, HashTable *data)
{
php_random_status_state_xoshiro256starstar *s = state;
zval t;
for (uint32_t i = 0; i < 4; i++) {
ZVAL_STR(&t, php_random_bin2hex_le(&s->state[i], sizeof(uint64_t)));
zend_hash_next_index_insert(data, &t);
}
return true;
}
static bool unserialize(void *state, HashTable *data)
{
php_random_status_state_xoshiro256starstar *s = state;
zval *t;
/* Verify the expected number of elements, this implicitly ensures that no additional elements are present. */
if (zend_hash_num_elements(data) != 4) {
return false;
}
for (uint32_t i = 0; i < 4; i++) {
t = zend_hash_index_find(data, i);
if (!t || Z_TYPE_P(t) != IS_STRING || Z_STRLEN_P(t) != (2 * sizeof(uint64_t))) {
return false;
}
if (!php_random_hex2bin_le(Z_STR_P(t), &s->state[i])) {
return false;
}
}
return true;
}
PHPAPI const php_random_algo php_random_algo_xoshiro256starstar = {
sizeof(php_random_status_state_xoshiro256starstar),
generate,
range,
serialize,
unserialize
};
PHPAPI void php_random_xoshiro256starstar_jump(php_random_status_state_xoshiro256starstar *state)
{
static const uint64_t jmp[] = {0x180ec6d33cfd0aba, 0xd5a61266f0c9392c, 0xa9582618e03fc9aa, 0x39abdc4529b1661c};
jump(state, jmp);
}
PHPAPI void php_random_xoshiro256starstar_jump_long(php_random_status_state_xoshiro256starstar *state)
{
static const uint64_t jmp[] = {0x76e15d3efefdcbbf, 0xc5004e441c522fb3, 0x77710069854ee241, 0x39109bb02acbe635};
jump(state, jmp);
}
/* {{{ Random\Engine\Xoshiro256StarStar::jump() */
PHP_METHOD(Random_Engine_Xoshiro256StarStar, jump)
{
php_random_algo_with_state engine = Z_RANDOM_ENGINE_P(ZEND_THIS)->engine;
php_random_status_state_xoshiro256starstar *state = engine.state;
ZEND_PARSE_PARAMETERS_NONE();
php_random_xoshiro256starstar_jump(state);
}
/* }}} */
/* {{{ Random\Engine\Xoshiro256StarStar::jumpLong() */
PHP_METHOD(Random_Engine_Xoshiro256StarStar, jumpLong)
{
php_random_algo_with_state engine = Z_RANDOM_ENGINE_P(ZEND_THIS)->engine;
php_random_status_state_xoshiro256starstar *state = engine.state;
ZEND_PARSE_PARAMETERS_NONE();
php_random_xoshiro256starstar_jump_long(state);
}
/* }}} */
/* {{{ Random\Engine\Xoshiro256StarStar::__construct */
PHP_METHOD(Random_Engine_Xoshiro256StarStar, __construct)
{
php_random_algo_with_state engine = Z_RANDOM_ENGINE_P(ZEND_THIS)->engine;
php_random_status_state_xoshiro256starstar *state = engine.state;
zend_string *str_seed = NULL;
zend_long int_seed = 0;
bool seed_is_null = true;
ZEND_PARSE_PARAMETERS_START(0, 1)
Z_PARAM_OPTIONAL;
Z_PARAM_STR_OR_LONG_OR_NULL(str_seed, int_seed, seed_is_null);
ZEND_PARSE_PARAMETERS_END();
if (seed_is_null) {
uint64_t t[4];
do {
if (php_random_bytes_throw(&t, sizeof(t)) == FAILURE) {
zend_throw_exception(random_ce_Random_RandomException, "Failed to generate a random seed", 0);
RETURN_THROWS();
}
} while (UNEXPECTED(t[0] == 0 && t[1] == 0 && t[2] == 0 && t[3] == 0));
php_random_xoshiro256starstar_seed256(state, t[0], t[1], t[2], t[3]);
} else {
if (str_seed) {
/* char (byte: 8 bit) * 32 = 256 bits */
if (ZSTR_LEN(str_seed) == 32) {
uint64_t t[4];
/* Endianness safe copy */
for (uint32_t i = 0; i < 4; i++) {
t[i] = 0;
for (uint32_t j = 0; j < 8; j++) {
t[i] += ((uint64_t) (unsigned char) ZSTR_VAL(str_seed)[(i * 8) + j]) << (j * 8);
}
}
if (UNEXPECTED(t[0] == 0 && t[1] == 0 && t[2] == 0 && t[3] == 0)) {
zend_argument_value_error(1, "must not consist entirely of NUL bytes");
RETURN_THROWS();
}
php_random_xoshiro256starstar_seed256(state, t[0], t[1], t[2], t[3]);
} else {
zend_argument_value_error(1, "must be a 32 byte (256 bit) string");
RETURN_THROWS();
}
} else {
php_random_xoshiro256starstar_seed64(state, (uint64_t) int_seed);
}
}
}
/* }}} */