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`random_compat` offers a set of compatible functions for older versions of PHP, filling in the gap by using other PHP extensions when available. We still include our existing `wp_rand()` functionality as a fallback for when no proper CSPRNG exists on the system. Take Two, this was previously committed in [34922] but had an issue on PHP 5.2 which sarciszewski has now resolved. Props sarciszewski See #28633 Built from https://develop.svn.wordpress.org/trunk@34981 git-svn-id: http://core.svn.wordpress.org/trunk@34946 1a063a9b-81f0-0310-95a4-ce76da25c4cd
84 lines
3.4 KiB
PHP
84 lines
3.4 KiB
PHP
<?php
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/**
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* Random_* Compatibility Library
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* for using the new PHP 7 random_* API in PHP 5 projects
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Paragon Initiative Enterprises
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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if (!defined('PHP_VERSION_ID')) {
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// This constant was introduced in PHP 5.2.7
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$version = explode('.', PHP_VERSION);
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define('PHP_VERSION_ID', ($version[0] * 10000 + $version[1] * 100 + $version[2]));
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}
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if (PHP_VERSION_ID < 70000) {
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if (!defined('RANDOM_COMPAT_READ_BUFFER')) {
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define('RANDOM_COMPAT_READ_BUFFER', 8);
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}
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require_once "byte_safe_strings.php";
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require_once "error_polyfill.php";
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if (!function_exists('random_bytes')) {
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/**
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* PHP 5.2.0 - 5.6.x way to implement random_bytes()
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*
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* We use conditional statements here to define the function in accordance
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* to the operating environment. It's a micro-optimization.
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*
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* In order of preference:
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* 1. fread() /dev/urandom if available
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* 2. mcrypt_create_iv($bytes, MCRYPT_CREATE_IV)
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* 3. COM('CAPICOM.Utilities.1')->GetRandom()
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* 4. openssl_random_pseudo_bytes()
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*
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* See ERRATA.md for our reasoning behind this particular order
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*/
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if (!ini_get('open_basedir') && is_readable('/dev/urandom')) {
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// See random_bytes_dev_urandom.php
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require_once "random_bytes_dev_urandom.php";
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} elseif (PHP_VERSION_ID >= 50307 && function_exists('mcrypt_create_iv')) {
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// See random_bytes_mcrypt.php
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require_once "random_bytes_mcrypt.php";
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} elseif (extension_loaded('com_dotnet')) {
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// See random_bytes_com_dotnet.php
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require_once "random_bytes_com_dotnet.php";
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} elseif (function_exists('openssl_random_pseudo_bytes')) {
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// See random_bytes_openssl.php
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require_once "random_bytes_openssl.php";
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} else {
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/**
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* We don't have any more options, so let's throw an exception right now
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* and hope the developer won't let it fail silently.
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*/
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function random_bytes()
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{
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throw new Exception(
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'There is no suitable CSPRNG installed on your system'
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);
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}
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}
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}
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if (!function_exists('random_int')) {
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require_once "random_int.php";
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}
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}
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