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random_compat
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random.php
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<?php /** * Random_* Compatibility Library * for using the new PHP 7 random_* API in PHP 5 projects * * @version 2.0.10 * @released 2017-03-13 * * 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('PHP_VERSION_ID')) { // This constant was introduced in PHP 5.2.7 $RandomCompatversion = array_map('intval', explode('.', PHP_VERSION)); define( 'PHP_VERSION_ID', $RandomCompatversion[0] * 10000 + $RandomCompatversion[1] * 100 + $RandomCompatversion[2] ); $RandomCompatversion = null; } /** * PHP 7.0.0 and newer have these functions natively. */ if (PHP_VERSION_ID >= 70000) { return; } if (!defined('RANDOM_COMPAT_READ_BUFFER')) { define('RANDOM_COMPAT_READ_BUFFER', 8); } $RandomCompatDIR = dirname(__FILE__); require_once $RandomCompatDIR . '/byte_safe_strings.php'; require_once $RandomCompatDIR . '/cast_to_int.php'; require_once $RandomCompatDIR . '/error_polyfill.php'; if (!is_callable('random_bytes')) { /** * PHP 5.2.0 - 5.6.x way to implement random_bytes() * * We use conditional statements here to define the function in accordance * to the operating environment. It's a micro-optimization. * * In order of preference: * 1. Use libsodium if available. * 2. fread() /dev/urandom if available (never on Windows) * 3. mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM) * 4. COM('CAPICOM.Utilities.1')->GetRandom() * * See RATIONALE.md for our reasoning behind this particular order */ if (extension_loaded('libsodium')) { // See random_bytes_libsodium.php if (PHP_VERSION_ID >= 50300 && is_callable('\\Sodium\\randombytes_buf')) { require_once $RandomCompatDIR . '/random_bytes_libsodium.php'; } elseif (method_exists('Sodium', 'randombytes_buf')) { require_once $RandomCompatDIR . '/random_bytes_libsodium_legacy.php'; } } /** * Reading directly from /dev/urandom: */ if (DIRECTORY_SEPARATOR === '/') { // DIRECTORY_SEPARATOR === '/' on Unix-like OSes -- this is a fast // way to exclude Windows. $RandomCompatUrandom = true; $RandomCompat_basedir = ini_get('open_basedir'); if (!empty($RandomCompat_basedir)) { $RandomCompat_open_basedir = explode( PATH_SEPARATOR, strtolower($RandomCompat_basedir) ); $RandomCompatUrandom = (array() !== array_intersect( array('/dev', '/dev/', '/dev/urandom'), $RandomCompat_open_basedir )); $RandomCompat_open_basedir = null; } if ( !is_callable('random_bytes') && $RandomCompatUrandom && @is_readable('/dev/urandom') ) { // Error suppression on is_readable() in case of an open_basedir // or safe_mode failure. All we care about is whether or not we // can read it at this point. If the PHP environment is going to // panic over trying to see if the file can be read in the first // place, that is not helpful to us here. // See random_bytes_dev_urandom.php require_once $RandomCompatDIR . '/random_bytes_dev_urandom.php'; } // Unset variables after use $RandomCompat_basedir = null; } else { $RandomCompatUrandom = false; } /** * mcrypt_create_iv() * * We only want to use mcypt_create_iv() if: * * - random_bytes() hasn't already been defined * - the mcrypt extensions is loaded * - One of these two conditions is true: * - We're on Windows (DIRECTORY_SEPARATOR !== '/') * - We're not on Windows and /dev/urandom is readabale * (i.e. we're not in a chroot jail) * - Special case: * - If we're not on Windows, but the PHP version is between * 5.6.10 and 5.6.12, we don't want to use mcrypt. It will * hang indefinitely. This is bad. * - If we're on Windows, we want to use PHP >= 5.3.7 or else * we get insufficient entropy errors. */ if ( !is_callable('random_bytes') && // Windows on PHP < 5.3.7 is broken, but non-Windows is not known to be. (DIRECTORY_SEPARATOR === '/' || PHP_VERSION_ID >= 50307) && // Prevent this code from hanging indefinitely on non-Windows; // see https://bugs.php.net/bug.php?id=69833 ( DIRECTORY_SEPARATOR !== '/' || (PHP_VERSION_ID <= 50609 || PHP_VERSION_ID >= 50613) ) && extension_loaded('mcrypt') ) { // See random_bytes_mcrypt.php require_once $RandomCompatDIR . '/random_bytes_mcrypt.php'; } $RandomCompatUrandom = null; /** * This is a Windows-specific fallback, for when the mcrypt extension * isn't loaded. */ if ( !is_callable('random_bytes') && extension_loaded('com_dotnet') && class_exists('COM') ) { $RandomCompat_disabled_classes = preg_split( '#\s*,\s*#', strtolower(ini_get('disable_classes')) ); if (!in_array('com', $RandomCompat_disabled_classes)) { try { $RandomCompatCOMtest = new COM('CAPICOM.Utilities.1'); if (method_exists($RandomCompatCOMtest, 'GetRandom')) { // See random_bytes_com_dotnet.php require_once $RandomCompatDIR . '/random_bytes_com_dotnet.php'; } } catch (com_exception $e) { // Don't try to use it. } } $RandomCompat_disabled_classes = null; $RandomCompatCOMtest = null; } /** * throw new Exception */ if (!is_callable('random_bytes')) { /** * We don't have any more options, so let's throw an exception right now * and hope the developer won't let it fail silently. * * @param mixed $length * @return void * @throws Exception */ function random_bytes($length) { unset($length); // Suppress "variable not used" warnings. throw new Exception( 'There is no suitable CSPRNG installed on your system' ); } } } if (!is_callable('random_int')) { require_once $RandomCompatDIR . '/random_int.php'; } $RandomCompatDIR = null;