/** * Random_* Compatibility Library * for using the new PHP 7 random_* API in PHP 5 projects * * @version 1.2.1 * @released 2016-02-29 * * The MIT License (MIT) * * Copyright (c) 2015 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 = explode('.', PHP_VERSION); define( 'PHP_VERSION_ID', $RandomCompatversion[0] * 10000 + $RandomCompatversion[1] * 100 + $RandomCompatversion[2] ); $RandomCompatversion = null; } if (PHP_VERSION_ID < 70000) { 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 $RandomCompatDIR.'/error_polyfill.php'; if (!function_exists('random_bytes')) { /** * PHP 5.2.0 - 5.6.x way to implement random_bytes() * * We use conditional statements here to define the function in accordance * to the operating environment. It's a micro-optimization. * * In order of preference: * 1. Use libsodium if available. * 2. fread() /dev/urandom if available (never on Windows) * 3. mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM) * 4. COM('CAPICOM.Utilities.1')->GetRandom() * 5. openssl_random_pseudo_bytes() (absolute last resort) * * See ERRATA.md for our reasoning behind this particular order */ if (extension_loaded('libsodium')) { // See random_bytes_libsodium.php if (PHP_VERSION_ID >= 50300 && function_exists('\\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 = in_array( '/dev', $RandomCompat_open_basedir ); $RandomCompat_open_basedir = null; } if ( !function_exists('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; $RandomCompatUrandom = null; } /** * mcrypt_create_iv() */ if ( !function_exists('random_bytes') && PHP_VERSION_ID >= 50307 && extension_loaded('mcrypt') ) { // Prevent this code from hanging indefinitely on non-Windows; // see https://bugs.php.net/bug.php?id=69833 if ( DIRECTORY_SEPARATOR !== '/' || (PHP_VERSION_ID <= 50609 || PHP_VERSION_ID >= 50613) ) { // See random_bytes_mcrypt.php require_once $RandomCompatDIR.'/random_bytes_mcrypt.php'; } } if ( !function_exists('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; } /** * openssl_random_pseudo_bytes() */ if ( ( // Unix-like with PHP >= 5.3.0 or ( DIRECTORY_SEPARATOR === '/' && PHP_VERSION_ID >= 50300 ) || // Windows with PHP >= 5.4.1 PHP_VERSION_ID >= 50401 ) && !function_exists('random_bytes') && extension_loaded('openssl') ) { // See random_bytes_openssl.php require_once $RandomCompatDIR.'/random_bytes_openssl.php'; } /** * throw new Exception */ if (!function_exists('random_bytes')) { /** * We don't have any more options, so let's throw an exception right now * and hope the developer won't let it fail silently. */ function random_bytes($length) { throw new Exception( 'There is no suitable CSPRNG installed on your system' ); } } } if (!function_exists('random_int')) { require_once $RandomCompatDIR.'/random_int.php'; } $RandomCompatDIR = null; }