annotate vendor/paragonie/random_compat/lib/random_bytes_com_dotnet.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@17 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 * Windows with PHP < 5.3.0 will not have the function
Chris@0 32 * openssl_random_pseudo_bytes() available, so let's use
Chris@0 33 * CAPICOM to work around this deficiency.
Chris@0 34 *
Chris@0 35 * @param int $bytes
Chris@0 36 *
Chris@0 37 * @throws Exception
Chris@0 38 *
Chris@0 39 * @return string
Chris@0 40 */
Chris@0 41 function random_bytes($bytes)
Chris@0 42 {
Chris@0 43 try {
Chris@16 44 /** @var int $bytes */
Chris@0 45 $bytes = RandomCompat_intval($bytes);
Chris@0 46 } catch (TypeError $ex) {
Chris@0 47 throw new TypeError(
Chris@0 48 'random_bytes(): $bytes must be an integer'
Chris@0 49 );
Chris@0 50 }
Chris@0 51
Chris@0 52 if ($bytes < 1) {
Chris@0 53 throw new Error(
Chris@0 54 'Length must be greater than 0'
Chris@0 55 );
Chris@0 56 }
Chris@0 57
Chris@16 58 /** @var string $buf */
Chris@0 59 $buf = '';
Chris@0 60 if (!class_exists('COM')) {
Chris@0 61 throw new Error(
Chris@0 62 'COM does not exist'
Chris@0 63 );
Chris@0 64 }
Chris@16 65 /** @var COM $util */
Chris@0 66 $util = new COM('CAPICOM.Utilities.1');
Chris@0 67 $execCount = 0;
Chris@0 68
Chris@0 69 /**
Chris@0 70 * Let's not let it loop forever. If we run N times and fail to
Chris@0 71 * get N bytes of random data, then CAPICOM has failed us.
Chris@0 72 */
Chris@0 73 do {
Chris@16 74 $buf .= base64_decode((string) $util->GetRandom($bytes, 0));
Chris@0 75 if (RandomCompat_strlen($buf) >= $bytes) {
Chris@0 76 /**
Chris@0 77 * Return our random entropy buffer here:
Chris@0 78 */
Chris@16 79 return (string) RandomCompat_substr($buf, 0, $bytes);
Chris@0 80 }
Chris@0 81 ++$execCount;
Chris@0 82 } while ($execCount < $bytes);
Chris@0 83
Chris@0 84 /**
Chris@0 85 * If we reach here, PHP has failed us.
Chris@0 86 */
Chris@0 87 throw new Exception(
Chris@0 88 'Could not gather sufficient random data'
Chris@0 89 );
Chris@0 90 }
Chris@17 91 }