/src/php-src/ext/random/zend_utils.c
Line | Count | Source |
1 | | /* |
2 | | +----------------------------------------------------------------------+ |
3 | | | Copyright © The PHP Group and Contributors. | |
4 | | +----------------------------------------------------------------------+ |
5 | | | This source file is subject to the Modified BSD License that is | |
6 | | | bundled with this package in the file LICENSE, and is available | |
7 | | | through the World Wide Web at <https://www.php.net/license/>. | |
8 | | | | |
9 | | | SPDX-License-Identifier: BSD-3-Clause | |
10 | | +----------------------------------------------------------------------+ |
11 | | | Authors: Arnaud Le Blanc <arnaud.lb@gmail.com> | |
12 | | | Tim Düsterhus <timwolla@php.net> | |
13 | | +----------------------------------------------------------------------+ |
14 | | */ |
15 | | |
16 | | #ifdef HAVE_CONFIG_H |
17 | | # include "config.h" |
18 | | #endif |
19 | | |
20 | | #include "php_random_zend_utils.h" |
21 | | |
22 | | ZEND_ATTRIBUTE_NONNULL PHPAPI void php_random_bytes_insecure_for_zend( |
23 | | zend_random_bytes_insecure_state *opaque_state, void *bytes, size_t size) |
24 | 0 | { |
25 | 0 | php_random_bytes_insecure_state_for_zend *state = (php_random_bytes_insecure_state_for_zend*) opaque_state; |
26 | |
|
27 | 0 | if (UNEXPECTED(!state->initialized)) { |
28 | 0 | uint64_t t[4]; |
29 | 0 | php_random_fallback_seed_state fallback_state; |
30 | 0 | fallback_state.initialized = false; |
31 | |
|
32 | 0 | do { |
33 | | /* Skip the CSPRNG if it has already failed */ |
34 | 0 | if (!fallback_state.initialized) { |
35 | 0 | char errstr[128]; |
36 | 0 | if (php_random_bytes_ex(&t, sizeof(t), errstr, sizeof(errstr)) == FAILURE) { |
37 | 0 | #if ZEND_DEBUG |
38 | 0 | fprintf(stderr, "php_random_bytes_ex: Failed to generate a random seed: %s\n", errstr); |
39 | 0 | #endif |
40 | 0 | goto fallback; |
41 | 0 | } |
42 | 0 | } else { |
43 | 0 | fallback: |
44 | 0 | t[0] = php_random_generate_fallback_seed_ex(&fallback_state); |
45 | 0 | t[1] = php_random_generate_fallback_seed_ex(&fallback_state); |
46 | 0 | t[2] = php_random_generate_fallback_seed_ex(&fallback_state); |
47 | 0 | t[3] = php_random_generate_fallback_seed_ex(&fallback_state); |
48 | 0 | } |
49 | 0 | } while (UNEXPECTED(t[0] == 0 && t[1] == 0 && t[2] == 0 && t[3] == 0)); |
50 | | |
51 | 0 | php_random_xoshiro256starstar_seed256(&state->xoshiro256starstar_state, t[0], t[1], t[2], t[3]); |
52 | 0 | state->initialized = true; |
53 | 0 | } |
54 | | |
55 | 0 | while (size > 0) { |
56 | 0 | php_random_result result = php_random_algo_xoshiro256starstar.generate(&state->xoshiro256starstar_state); |
57 | 0 | ZEND_ASSERT(result.size == 8 && sizeof(result.result) == 8); |
58 | 0 | size_t chunk_size = MIN(size, 8); |
59 | 0 | bytes = zend_mempcpy(bytes, &result.result, chunk_size); |
60 | 0 | size -= chunk_size; |
61 | 0 | } |
62 | 0 | } |