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Add zend_random_bytes(), zend_random_bytes_insecure() functions (#14054)

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Co-authored-by: Tim Düsterhus <tim@bastelstu.be>
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Arnaud Le Blanc 2024-06-12 13:57:54 +02:00
parent d545b1d643
commit d1048a0869
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10 changed files with 169 additions and 12 deletions
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ext/random/zend_utils.c Normal file
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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. |
+----------------------------------------------------------------------+
| Authors: Arnaud Le Blanc <arnaud.lb@gmail.com> |
| Tim Düsterhus <timwolla@php.net> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "php_random_zend_utils.h"
ZEND_ATTRIBUTE_NONNULL PHPAPI void php_random_bytes_insecure_for_zend(
zend_random_bytes_insecure_state *opaque_state, void *bytes, size_t size)
{
php_random_bytes_insecure_state_for_zend *state = (php_random_bytes_insecure_state_for_zend*) opaque_state;
if (UNEXPECTED(!state->initialized)) {
uint64_t t[4];
php_random_fallback_seed_state fallback_state;
fallback_state.initialized = false;
do {
/* Skip the CSPRNG if it has already failed */
if (!fallback_state.initialized) {
char errstr[128];
if (php_random_bytes_ex(&t, sizeof(t), errstr, sizeof(errstr)) == FAILURE) {
#if ZEND_DEBUG
fprintf(stderr, "php_random_bytes_ex: Failed to generate a random seed: %s\n", errstr);
#endif
goto fallback;
}
} else {
fallback:
t[0] = php_random_generate_fallback_seed_ex(&fallback_state);
t[1] = php_random_generate_fallback_seed_ex(&fallback_state);
t[2] = php_random_generate_fallback_seed_ex(&fallback_state);
t[3] = php_random_generate_fallback_seed_ex(&fallback_state);
}
} while (UNEXPECTED(t[0] == 0 && t[1] == 0 && t[2] == 0 && t[3] == 0));
php_random_xoshiro256starstar_seed256(&state->xoshiro256starstar_state, t[0], t[1], t[2], t[3]);
state->initialized = true;
}
while (size > 0) {
php_random_result result = php_random_algo_xoshiro256starstar.generate(&state->xoshiro256starstar_state);
ZEND_ASSERT(result.size == 8 && sizeof(result.result) == 8);
size_t chunk_size = MIN(size, 8);
bytes = zend_mempcpy(bytes, &result.result, chunk_size);
size -= chunk_size;
}
}