216 lines
7.8 KiB
PHP
216 lines
7.8 KiB
PHP
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<?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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* @version 2.0.4
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* @released 2016-11-07
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 - 2016 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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$RandomCompatversion = array_map('intval', explode('.', PHP_VERSION));
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define(
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'PHP_VERSION_ID',
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$RandomCompatversion[0] * 10000
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+ $RandomCompatversion[1] * 100
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+ $RandomCompatversion[2]
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);
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$RandomCompatversion = null;
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}
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/**
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* PHP 7.0.0 and newer have these functions natively.
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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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$RandomCompatDIR = dirname(__FILE__);
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require_once $RandomCompatDIR.'/byte_safe_strings.php';
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require_once $RandomCompatDIR.'/cast_to_int.php';
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require_once $RandomCompatDIR.'/error_polyfill.php';
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if (!is_callable('random_bytes')) {
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/**
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* PHP 5.2.0 - 5.6.x way to implement random_bytes()
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*
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* We use conditional statements here to define the function in accordance
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* to the operating environment. It's a micro-optimization.
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*
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* In order of preference:
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* 1. Use libsodium if available.
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* 2. fread() /dev/urandom if available (never on Windows)
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* 3. mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM)
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* 4. COM('CAPICOM.Utilities.1')->GetRandom()
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* 5. openssl_random_pseudo_bytes() (absolute last resort)
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*
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* See RATIONALE.md for our reasoning behind this particular order
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*/
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if (extension_loaded('libsodium')) {
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// See random_bytes_libsodium.php
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if (PHP_VERSION_ID >= 50300 && is_callable('\\Sodium\\randombytes_buf')) {
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require_once $RandomCompatDIR.'/random_bytes_libsodium.php';
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} elseif (method_exists('Sodium', 'randombytes_buf')) {
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require_once $RandomCompatDIR.'/random_bytes_libsodium_legacy.php';
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}
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}
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/**
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* Reading directly from /dev/urandom:
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*/
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if (DIRECTORY_SEPARATOR === '/') {
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// DIRECTORY_SEPARATOR === '/' on Unix-like OSes -- this is a fast
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// way to exclude Windows.
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$RandomCompatUrandom = true;
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$RandomCompat_basedir = ini_get('open_basedir');
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if (!empty($RandomCompat_basedir)) {
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$RandomCompat_open_basedir = explode(
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PATH_SEPARATOR,
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strtolower($RandomCompat_basedir)
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);
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$RandomCompatUrandom = (array() !== array_intersect(
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array('/dev', '/dev/', '/dev/urandom'),
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$RandomCompat_open_basedir
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));
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$RandomCompat_open_basedir = null;
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}
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if (
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!is_callable('random_bytes')
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&&
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$RandomCompatUrandom
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&&
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@is_readable('/dev/urandom')
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) {
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// Error suppression on is_readable() in case of an open_basedir
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// or safe_mode failure. All we care about is whether or not we
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// can read it at this point. If the PHP environment is going to
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// panic over trying to see if the file can be read in the first
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// place, that is not helpful to us here.
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// See random_bytes_dev_urandom.php
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require_once $RandomCompatDIR.'/random_bytes_dev_urandom.php';
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}
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// Unset variables after use
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$RandomCompat_basedir = null;
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} else {
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$RandomCompatUrandom = false;
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}
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/**
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* mcrypt_create_iv()
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*
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* We only want to use mcypt_create_iv() if:
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*
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* - random_bytes() hasn't already been defined
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* - PHP >= 5.3.7
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* - the mcrypt extensions is loaded
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* - One of these two conditions is true:
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* - We're on Windows (DIRECTORY_SEPARATOR !== '/')
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* - We're not on Windows and /dev/urandom is readabale
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* (i.e. we're not in a chroot jail)
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* - Special case:
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* - If we're not on Windows, but the PHP version is between
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* 5.6.10 and 5.6.12, we don't want to use mcrypt. It will
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* hang indefinitely. This is bad.
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*/
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if (
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!is_callable('random_bytes')
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&&
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PHP_VERSION_ID >= 50307
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&&
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extension_loaded('mcrypt')
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) {
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// Prevent this code from hanging indefinitely on non-Windows;
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// see https://bugs.php.net/bug.php?id=69833
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if (
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DIRECTORY_SEPARATOR !== '/' ||
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(PHP_VERSION_ID <= 50609 || PHP_VERSION_ID >= 50613)
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) {
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// See random_bytes_mcrypt.php
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require_once $RandomCompatDIR.'/random_bytes_mcrypt.php';
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}
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}
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$RandomCompatUrandom = null;
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/**
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* This is a Windows-specific fallback, for when the mcrypt extension
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* isn't loaded.
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*/
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if (
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!is_callable('random_bytes')
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&&
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extension_loaded('com_dotnet')
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&&
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class_exists('COM')
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) {
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$RandomCompat_disabled_classes = preg_split(
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'#\s*,\s*#',
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strtolower(ini_get('disable_classes'))
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);
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if (!in_array('com', $RandomCompat_disabled_classes)) {
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try {
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$RandomCompatCOMtest = new COM('CAPICOM.Utilities.1');
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if (method_exists($RandomCompatCOMtest, 'GetRandom')) {
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// See random_bytes_com_dotnet.php
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require_once $RandomCompatDIR.'/random_bytes_com_dotnet.php';
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}
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} catch (com_exception $e) {
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// Don't try to use it.
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}
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}
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$RandomCompat_disabled_classes = null;
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$RandomCompatCOMtest = null;
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}
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/**
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* throw new Exception
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*/
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if (!is_callable('random_bytes')) {
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/**
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* We don't have any more options, so let's throw an exception right now
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* and hope the developer won't let it fail silently.
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*/
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function random_bytes($length)
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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 (!is_callable('random_int')) {
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require_once $RandomCompatDIR.'/random_int.php';
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}
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$RandomCompatDIR = null;
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}
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