3 * Random_* Compatibility Library
4 * for using the new PHP 7 random_* API in PHP 5 projects
6 * The MIT License (MIT)
8 * Copyright (c) 2015 - 2017 Paragon Initiative Enterprises
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 if (!is_callable('random_bytes')) {
31 * If the libsodium PHP extension is loaded, we'll use it above any other
34 * libsodium-php project:
35 * @ref https://github.com/jedisct1/libsodium-php
43 function random_bytes($bytes)
46 $bytes = RandomCompat_intval($bytes);
47 } catch (TypeError $ex) {
49 'random_bytes(): $bytes must be an integer'
55 'Length must be greater than 0'
65 * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
66 * generated in one invocation.
68 if ($bytes > 2147483647) {
69 for ($i = 0; $i < $bytes; $i += 1073741824) {
70 $n = ($bytes - $i) > 1073741824
73 $buf .= Sodium::randombytes_buf($n);
76 $buf .= Sodium::randombytes_buf($bytes);
79 if (is_string($buf)) {
80 if (RandomCompat_strlen($buf) === $bytes) {
86 * If we reach here, PHP has failed us.
89 'Could not gather sufficient random data'