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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: Melissa O'Neill <oneill@pcg-random.org> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "php.h"
#include "php_random.h"
#include "php_random_csprng.h"
#include "php_random_uint128.h"
#include "Zend/zend_exceptions.h"
static inline void step(php_random_status_state_pcgoneseq128xslrr64 *s)
{
s->state = php_random_uint128_add(
php_random_uint128_multiply(s->state, php_random_uint128_constant(2549297995355413924ULL,4865540595714422341ULL)),
php_random_uint128_constant(6364136223846793005ULL,1442695040888963407ULL)
);
}
PHPAPI inline void php_random_pcgoneseq128xslrr64_seed128(php_random_status_state_pcgoneseq128xslrr64 *s, php_random_uint128_t seed)
{
s->state = php_random_uint128_constant(0ULL, 0ULL);
step(s);
s->state = php_random_uint128_add(s->state, seed);
step(s);
}
static php_random_result generate(void *state)
{
php_random_status_state_pcgoneseq128xslrr64 *s = state;
step(s);
return (php_random_result){
.size = sizeof(uint64_t),
.result = php_random_pcgoneseq128xslrr64_rotr64(s->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_pcgoneseq128xslrr64,
.state = state,
}, min, max);
}
static bool serialize(void *state, HashTable *data)
{
php_random_status_state_pcgoneseq128xslrr64 *s = state;
uint64_t u;
zval z;
u = php_random_uint128_hi(s->state);
ZVAL_STR(&z, php_random_bin2hex_le(&u, sizeof(uint64_t)));
zend_hash_next_index_insert(data, &z);
u = php_random_uint128_lo(s->state);
ZVAL_STR(&z, php_random_bin2hex_le(&u, sizeof(uint64_t)));
zend_hash_next_index_insert(data, &z);
return true;
}
static bool unserialize(void *state, HashTable *data)
{
php_random_status_state_pcgoneseq128xslrr64 *s = state;
uint64_t u[2];
zval *t;
/* Verify the expected number of elements, this implicitly ensures that no additional elements are present. */
if (zend_hash_num_elements(data) != 2) {
return false;
}
for (uint32_t i = 0; i < 2; 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), &u[i])) {
return false;
}
}
s->state = php_random_uint128_constant(u[0], u[1]);
return true;
}
PHPAPI const php_random_algo php_random_algo_pcgoneseq128xslrr64 = {
sizeof(php_random_status_state_pcgoneseq128xslrr64),
generate,
range,
serialize,
unserialize
};
/* {{{ php_random_pcgoneseq128xslrr64_advance */
PHPAPI void php_random_pcgoneseq128xslrr64_advance(php_random_status_state_pcgoneseq128xslrr64 *state, uint64_t advance)
{
php_random_uint128_t
cur_mult = php_random_uint128_constant(2549297995355413924ULL,4865540595714422341ULL),
cur_plus = php_random_uint128_constant(6364136223846793005ULL,1442695040888963407ULL),
acc_mult = php_random_uint128_constant(0ULL, 1ULL),
acc_plus = php_random_uint128_constant(0ULL, 0ULL);
while (advance > 0) {
if (advance & 1) {
acc_mult = php_random_uint128_multiply(acc_mult, cur_mult);
acc_plus = php_random_uint128_add(php_random_uint128_multiply(acc_plus, cur_mult), cur_plus);
}
cur_plus = php_random_uint128_multiply(php_random_uint128_add(cur_mult, php_random_uint128_constant(0ULL, 1ULL)), cur_plus);
cur_mult = php_random_uint128_multiply(cur_mult, cur_mult);
advance /= 2;
}
state->state = php_random_uint128_add(php_random_uint128_multiply(acc_mult, state->state), acc_plus);
}
/* }}} */
/* {{{ Random\Engine\PcgOneseq128XslRr64::__construct */
PHP_METHOD(Random_Engine_PcgOneseq128XslRr64, __construct)
{
php_random_algo_with_state engine = Z_RANDOM_ENGINE_P(ZEND_THIS)->engine;
php_random_status_state_pcgoneseq128xslrr64 *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) {
php_random_uint128_t s;
if (php_random_bytes_throw(&s, sizeof(s)) == FAILURE) {
zend_throw_exception(random_ce_Random_RandomException, "Failed to generate a random seed", 0);
RETURN_THROWS();
}
php_random_pcgoneseq128xslrr64_seed128(state, s);
} else {
if (str_seed) {
/* char (byte: 8 bit) * 16 = 128 bits */
if (ZSTR_LEN(str_seed) == 16) {
uint64_t t[2];
/* Endianness safe copy */
for (uint32_t i = 0; i < 2; 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);
}
}
php_random_pcgoneseq128xslrr64_seed128(state, php_random_uint128_constant(t[0], t[1]));
} else {
zend_argument_value_error(1, "must be a 16 byte (128 bit) string");
RETURN_THROWS();
}
} else {
php_random_pcgoneseq128xslrr64_seed128(state, php_random_uint128_constant(0ULL, (uint64_t) int_seed));
}
}
}
/* }}} */
/* {{{ Random\Engine\PcgOneseq128XslRr64::jump() */
PHP_METHOD(Random_Engine_PcgOneseq128XslRr64, jump)
{
php_random_algo_with_state engine = Z_RANDOM_ENGINE_P(ZEND_THIS)->engine;
php_random_status_state_pcgoneseq128xslrr64 *state = engine.state;
zend_long advance = 0;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(advance);
ZEND_PARSE_PARAMETERS_END();
if (UNEXPECTED(advance < 0)) {
zend_argument_value_error(1, "must be greater than or equal to 0");
RETURN_THROWS();
}
php_random_pcgoneseq128xslrr64_advance(state, advance);
}
/* }}} */
|
