63 lines
2.5 KiB
C
63 lines
2.5 KiB
C
/*
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+----------------------------------------------------------------------+
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| Copyright © The PHP Group and Contributors. |
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+----------------------------------------------------------------------+
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| This source file is subject to the Modified BSD License that is |
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| bundled with this package in the file LICENSE, and is available |
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| through the World Wide Web at <https://www.php.net/license/>. |
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| |
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| SPDX-License-Identifier: BSD-3-Clause |
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+----------------------------------------------------------------------+
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| Authors: Arnaud Le Blanc <arnaud.lb@gmail.com> |
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| Tim Düsterhus <timwolla@php.net> |
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+----------------------------------------------------------------------+
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "php_random_zend_utils.h"
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ZEND_ATTRIBUTE_NONNULL PHPAPI void php_random_bytes_insecure_for_zend(
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zend_random_bytes_insecure_state *opaque_state, void *bytes, size_t size)
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{
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php_random_bytes_insecure_state_for_zend *state = (php_random_bytes_insecure_state_for_zend*) opaque_state;
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if (UNEXPECTED(!state->initialized)) {
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uint64_t t[4];
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php_random_fallback_seed_state fallback_state;
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fallback_state.initialized = false;
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do {
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/* Skip the CSPRNG if it has already failed */
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if (!fallback_state.initialized) {
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char errstr[128];
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if (php_random_bytes_ex(&t, sizeof(t), errstr, sizeof(errstr)) == FAILURE) {
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#if ZEND_DEBUG
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fprintf(stderr, "php_random_bytes_ex: Failed to generate a random seed: %s\n", errstr);
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#endif
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goto fallback;
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}
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} else {
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fallback:
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t[0] = php_random_generate_fallback_seed_ex(&fallback_state);
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t[1] = php_random_generate_fallback_seed_ex(&fallback_state);
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t[2] = php_random_generate_fallback_seed_ex(&fallback_state);
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t[3] = php_random_generate_fallback_seed_ex(&fallback_state);
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}
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} while (UNEXPECTED(t[0] == 0 && t[1] == 0 && t[2] == 0 && t[3] == 0));
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php_random_xoshiro256starstar_seed256(&state->xoshiro256starstar_state, t[0], t[1], t[2], t[3]);
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state->initialized = true;
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}
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while (size > 0) {
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php_random_result result = php_random_algo_xoshiro256starstar.generate(&state->xoshiro256starstar_state);
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ZEND_ASSERT(result.size == 8 && sizeof(result.result) == 8);
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size_t chunk_size = MIN(size, 8);
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bytes = zend_mempcpy(bytes, &result.result, chunk_size);
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size -= chunk_size;
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}
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}
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