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- <?php
- /**
- * Random_* Compatibility Library
- * for using the new PHP 7 random_* API in PHP 5 projects
- *
- * The MIT License (MIT)
- *
- * Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
- if (!is_callable('random_bytes')) {
- /**
- * If the libsodium PHP extension is loaded, we'll use it above any other
- * solution.
- *
- * libsodium-php project:
- * @ref https://github.com/jedisct1/libsodium-php
- *
- * @param int $bytes
- *
- * @throws Exception
- *
- * @return string
- */
- function random_bytes($bytes)
- {
- try {
- $bytes = RandomCompat_intval($bytes);
- } catch (TypeError $ex) {
- throw new TypeError(
- 'random_bytes(): $bytes must be an integer'
- );
- }
- if ($bytes < 1) {
- throw new Error(
- 'Length must be greater than 0'
- );
- }
- /**
- * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
- * generated in one invocation.
- */
- if ($bytes > 2147483647) {
- $buf = '';
- for ($i = 0; $i < $bytes; $i += 1073741824) {
- $n = ($bytes - $i) > 1073741824
- ? 1073741824
- : $bytes - $i;
- $buf .= \Sodium\randombytes_buf($n);
- }
- } else {
- $buf = \Sodium\randombytes_buf($bytes);
- }
- if ($buf !== false) {
- if (RandomCompat_strlen($buf) === $bytes) {
- return $buf;
- }
- }
- /**
- * If we reach here, PHP has failed us.
- */
- throw new Exception(
- 'Could not gather sufficient random data'
- );
- }
- }
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