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Editing: random_bytes_dev_urandom.php
<?php /** * Random_* Compatibility Library * for using the new PHP 7 random_* API in PHP 5 projects * * The MIT License (MIT) * * Copyright (c) 2015 - 2017 Paragon Initiative Enterprises * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ if (!defined('RANDOM_COMPAT_READ_BUFFER')) { define('RANDOM_COMPAT_READ_BUFFER', 8); } if (!is_callable('random_bytes')) { /** * Unless open_basedir is enabled, use /dev/urandom for * random numbers in accordance with best practices * * Why we use /dev/urandom and not /dev/random * @ref http://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers * * @param int $bytes * * @throws Exception * * @return string */ function random_bytes($bytes) { static $fp = null; /** * This block should only be run once */ if (empty($fp)) { /** * We use /dev/urandom if it is a char device. * We never fall back to /dev/random */ $fp = fopen('/dev/urandom', 'rb'); if (!empty($fp)) { $st = fstat($fp); if (($st['mode'] & 0170000) !== 020000) { fclose($fp); $fp = false; } } if (!empty($fp)) { /** * stream_set_read_buffer() does not exist in HHVM * * If we don't set the stream's read buffer to 0, PHP will * internally buffer 8192 bytes, which can waste entropy * * stream_set_read_buffer returns 0 on success */ if (is_callable('stream_set_read_buffer')) { stream_set_read_buffer($fp, RANDOM_COMPAT_READ_BUFFER); } if (is_callable('stream_set_chunk_size')) { stream_set_chunk_size($fp, RANDOM_COMPAT_READ_BUFFER); } } } try { $bytes = RandomCompat_intval($bytes); } catch (TypeError $ex) { throw new TypeError( 'random_bytes(): $bytes must be an integer' ); } if ($bytes < 1) { throw new Error( 'Length must be greater than 0' ); } /** * This if() block only runs if we managed to open a file handle * * It does not belong in an else {} block, because the above * if (empty($fp)) line is logic that should only be run once per * page load. */ if (!empty($fp)) { /** * @var int */ $remaining = $bytes; /** * @var string|bool */ $buf = ''; /** * We use fread() in a loop to protect against partial reads */ do { /** * @var string|bool */ $read = fread($fp, $remaining); if (!is_string($read)) { if ($read === false) { /** * We cannot safely read from the file. Exit the * do-while loop and trigger the exception condition * * @var string|bool */ $buf = false; break; } } /** * Decrease the number of bytes returned from remaining */ $remaining -= RandomCompat_strlen($read); /** * @var string|bool */ $buf = $buf . $read; } while ($remaining > 0); /** * Is our result valid? */ if (is_string($buf)) { if (RandomCompat_strlen($buf) === $bytes) { /** * Return our random entropy buffer here: */ return $buf; } } } /** * If we reach here, PHP has failed us. */ throw new Exception( 'Error reading from source device' ); } }
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