--- /dev/null
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * 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_CREATE_IV)
+ * 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
+ require_once $RandomCompatDIR.'/random_bytes_libsodium.php';
+ }
+ if (
+ !function_exists('random_bytes') &&
+ DIRECTORY_SEPARATOR === '/' &&
+ @is_readable('/dev/urandom')
+ ) {
+ // DIRECTORY_SEPARATOR === '/' on Unix-like OSes -- this is a fast
+ // way to exclude Windows.
+ //
+ // 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';
+ }
+ if (
+ !function_exists('random_bytes') &&
+ PHP_VERSION_ID >= 50307 &&
+ extension_loaded('mcrypt')
+ ) {
+ // See random_bytes_mcrypt.php
+ require_once $RandomCompatDIR.'/random_bytes_mcrypt.php';
+ }
+ if (
+ !function_exists('random_bytes') &&
+ extension_loaded('com_dotnet') &&
+ class_exists('COM')
+ ) {
+ 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.
+ }
+ $RandomCompatCOMtest = null;
+ }
+ if (
+ !function_exists('random_bytes') &&
+ extension_loaded('openssl') &&
+ (
+ // Unix-like with PHP >= 5.3.0 or
+ (
+ DIRECTORY_SEPARATOR === '/' &&
+ PHP_VERSION_ID >= 50300
+ ) ||
+ // Windows with PHP >= 5.4.1
+ PHP_VERSION_ID >= 50401
+ )
+ ) {
+ // See random_bytes_openssl.php
+ require_once $RandomCompatDIR.'/random_bytes_openssl.php';
+ }
+ 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()
+ {
+ 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;
+}