annotate vendor/paragonie/random_compat/lib/random_bytes_mcrypt.php @ 19:fa3358dc1485 tip

Add ndrum files
author Chris Cannam
date Wed, 28 Aug 2019 13:14:47 +0100
parents 129ea1e6d783
children
rev   line source
Chris@0 1 <?php
Chris@0 2 /**
Chris@17 3 * Random_* Compatibility Library
Chris@0 4 * for using the new PHP 7 random_* API in PHP 5 projects
Chris@17 5 *
Chris@0 6 * The MIT License (MIT)
Chris@0 7 *
Chris@16 8 * Copyright (c) 2015 - 2018 Paragon Initiative Enterprises
Chris@17 9 *
Chris@0 10 * Permission is hereby granted, free of charge, to any person obtaining a copy
Chris@0 11 * of this software and associated documentation files (the "Software"), to deal
Chris@0 12 * in the Software without restriction, including without limitation the rights
Chris@0 13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Chris@0 14 * copies of the Software, and to permit persons to whom the Software is
Chris@0 15 * furnished to do so, subject to the following conditions:
Chris@17 16 *
Chris@0 17 * The above copyright notice and this permission notice shall be included in
Chris@0 18 * all copies or substantial portions of the Software.
Chris@17 19 *
Chris@0 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Chris@0 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Chris@0 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Chris@0 23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Chris@0 24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Chris@0 25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
Chris@0 26 * SOFTWARE.
Chris@0 27 */
Chris@0 28
Chris@0 29 if (!is_callable('random_bytes')) {
Chris@0 30 /**
Chris@0 31 * Powered by ext/mcrypt (and thankfully NOT libmcrypt)
Chris@0 32 *
Chris@0 33 * @ref https://bugs.php.net/bug.php?id=55169
Chris@0 34 * @ref https://github.com/php/php-src/blob/c568ffe5171d942161fc8dda066bce844bdef676/ext/mcrypt/mcrypt.c#L1321-L1386
Chris@0 35 *
Chris@0 36 * @param int $bytes
Chris@0 37 *
Chris@0 38 * @throws Exception
Chris@0 39 *
Chris@0 40 * @return string
Chris@0 41 */
Chris@0 42 function random_bytes($bytes)
Chris@0 43 {
Chris@0 44 try {
Chris@16 45 /** @var int $bytes */
Chris@0 46 $bytes = RandomCompat_intval($bytes);
Chris@0 47 } catch (TypeError $ex) {
Chris@0 48 throw new TypeError(
Chris@0 49 'random_bytes(): $bytes must be an integer'
Chris@0 50 );
Chris@0 51 }
Chris@0 52
Chris@0 53 if ($bytes < 1) {
Chris@0 54 throw new Error(
Chris@0 55 'Length must be greater than 0'
Chris@0 56 );
Chris@0 57 }
Chris@0 58
Chris@16 59 /** @var string|bool $buf */
Chris@16 60 $buf = @mcrypt_create_iv((int) $bytes, (int) MCRYPT_DEV_URANDOM);
Chris@0 61 if (
Chris@16 62 is_string($buf)
Chris@16 63 &&
Chris@0 64 RandomCompat_strlen($buf) === $bytes
Chris@0 65 ) {
Chris@0 66 /**
Chris@0 67 * Return our random entropy buffer here:
Chris@0 68 */
Chris@0 69 return $buf;
Chris@0 70 }
Chris@0 71
Chris@0 72 /**
Chris@0 73 * If we reach here, PHP has failed us.
Chris@0 74 */
Chris@0 75 throw new Exception(
Chris@0 76 'Could not gather sufficient random data'
Chris@0 77 );
Chris@0 78 }
Chris@0 79 }