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<?php |
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/** |
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* Random_* Compatibility Library |
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* for using the new PHP 7 random_* API in PHP 5 projects |
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* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2015 - 2018 Paragon Initiative Enterprises |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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|
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if (!is_callable('random_bytes')) { |
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/** |
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* Windows with PHP < 5.3.0 will not have the function |
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* openssl_random_pseudo_bytes() available, so let's use |
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* CAPICOM to work around this deficiency. |
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* |
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* @param int $bytes |
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* |
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* @throws Exception |
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* |
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* @return string |
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*/ |
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function random_bytes($bytes) |
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{ |
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try { |
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/** @var int $bytes */ |
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$bytes = RandomCompat_intval($bytes); |
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} catch (TypeError $ex) { |
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throw new TypeError( |
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'random_bytes(): $bytes must be an integer' |
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); |
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} |
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|
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if ($bytes < 1) { |
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throw new Error( |
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'Length must be greater than 0' |
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); |
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} |
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|
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/** @var string $buf */ |
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$buf = ''; |
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if (!class_exists('COM')) { |
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throw new Error( |
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'COM does not exist' |
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); |
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} |
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/** @var COM $util */ |
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$util = new COM('CAPICOM.Utilities.1'); |
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$execCount = 0; |
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|
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/** |
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* Let's not let it loop forever. If we run N times and fail to |
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* get N bytes of random data, then CAPICOM has failed us. |
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*/ |
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do { |
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$buf .= base64_decode((string) $util->GetRandom($bytes, 0)); |
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if (RandomCompat_strlen($buf) >= $bytes) { |
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/** |
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* Return our random entropy buffer here: |
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*/ |
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return (string) RandomCompat_substr($buf, 0, $bytes); |
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} |
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++$execCount; |
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} while ($execCount < $bytes); |
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|
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/** |
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* If we reach here, PHP has failed us. |
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*/ |
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throw new Exception( |
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'Could not gather sufficient random data' |
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); |
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} |
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} |
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|
