WordPress 4.4

[autoinstalls/wordpress.git] / wp-includes / random_compat / random.php

diff --git a/wp-includes/random_compat/random.php b/wp-includes/random_compat/random.php
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+<?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;
+}