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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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* If the libsodium PHP extension is loaded, we'll use it above any other |
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* solution. |
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* |
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* libsodium-php project: |
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* @ref https://github.com/jedisct1/libsodium-php |
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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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/** |
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* @var string |
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*/ |
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$buf = ''; |
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|
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/** |
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* \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be |
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* generated in one invocation. |
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*/ |
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if ($bytes > 2147483647) { |
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for ($i = 0; $i < $bytes; $i += 1073741824) { |
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$n = ($bytes - $i) > 1073741824 |
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? 1073741824 |
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: $bytes - $i; |
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$buf .= Sodium::randombytes_buf((int) $n); |
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} |
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} else { |
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$buf .= Sodium::randombytes_buf((int) $bytes); |
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} |
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|
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if (is_string($buf)) { |
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if (RandomCompat_strlen($buf) === $bytes) { |
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return $buf; |
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} |
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} |
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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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|
