255 lines
6.7 KiB
PHP
255 lines
6.7 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2019, British Columbia Institute of Technology
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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
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 3.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* PHP ext/hash compatibility package
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*
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* @package CodeIgniter
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* @subpackage CodeIgniter
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* @category Compatibility
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* @author Andrey Andreev
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* @link https://codeigniter.com/user_guide/
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* @link http://php.net/hash
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*/
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// ------------------------------------------------------------------------
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if (is_php('5.6'))
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{
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return;
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('hash_equals'))
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{
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/**
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* hash_equals()
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*
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* @link http://php.net/hash_equals
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* @param string $known_string
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* @param string $user_string
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* @return bool
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*/
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function hash_equals($known_string, $user_string)
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{
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if ( ! is_string($known_string))
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{
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trigger_error('hash_equals(): Expected known_string to be a string, '.strtolower(gettype($known_string)).' given', E_USER_WARNING);
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return FALSE;
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}
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elseif ( ! is_string($user_string))
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{
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trigger_error('hash_equals(): Expected user_string to be a string, '.strtolower(gettype($user_string)).' given', E_USER_WARNING);
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return FALSE;
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}
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elseif (($length = strlen($known_string)) !== strlen($user_string))
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{
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return FALSE;
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}
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$diff = 0;
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for ($i = 0; $i < $length; $i++)
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{
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$diff |= ord($known_string[$i]) ^ ord($user_string[$i]);
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}
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return ($diff === 0);
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}
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}
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// ------------------------------------------------------------------------
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if (is_php('5.5'))
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{
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return;
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('hash_pbkdf2'))
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{
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/**
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* hash_pbkdf2()
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*
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* @link http://php.net/hash_pbkdf2
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* @param string $algo
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* @param string $password
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* @param string $salt
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* @param int $iterations
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* @param int $length
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* @param bool $raw_output
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* @return string
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*/
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function hash_pbkdf2($algo, $password, $salt, $iterations, $length = 0, $raw_output = FALSE)
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{
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if ( ! in_array(strtolower($algo), hash_algos(), TRUE))
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{
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trigger_error('hash_pbkdf2(): Unknown hashing algorithm: '.$algo, E_USER_WARNING);
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return FALSE;
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}
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if (($type = gettype($iterations)) !== 'integer')
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{
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if ($type === 'object' && method_exists($iterations, '__toString'))
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{
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$iterations = (string) $iterations;
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}
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if (is_string($iterations) && is_numeric($iterations))
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{
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$iterations = (int) $iterations;
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}
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else
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{
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trigger_error('hash_pbkdf2() expects parameter 4 to be long, '.$type.' given', E_USER_WARNING);
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return NULL;
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}
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}
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if ($iterations < 1)
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{
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trigger_error('hash_pbkdf2(): Iterations must be a positive integer: '.$iterations, E_USER_WARNING);
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return FALSE;
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}
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if (($type = gettype($length)) !== 'integer')
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{
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if ($type === 'object' && method_exists($length, '__toString'))
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{
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$length = (string) $length;
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}
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if (is_string($length) && is_numeric($length))
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{
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$length = (int) $length;
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}
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else
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{
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trigger_error('hash_pbkdf2() expects parameter 5 to be long, '.$type.' given', E_USER_WARNING);
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return NULL;
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}
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}
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if ($length < 0)
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{
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trigger_error('hash_pbkdf2(): Length must be greater than or equal to 0: '.$length, E_USER_WARNING);
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return FALSE;
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}
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$hash_length = defined('MB_OVERLOAD_STRING')
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? mb_strlen(hash($algo, NULL, TRUE), '8bit')
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: strlen(hash($algo, NULL, TRUE));
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empty($length) && $length = $hash_length;
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// Pre-hash password inputs longer than the algorithm's block size
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// (i.e. prepare HMAC key) to mitigate potential DoS attacks.
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static $block_sizes;
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empty($block_sizes) && $block_sizes = array(
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'gost' => 32,
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'haval128,3' => 128,
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'haval160,3' => 128,
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'haval192,3' => 128,
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'haval224,3' => 128,
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'haval256,3' => 128,
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'haval128,4' => 128,
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'haval160,4' => 128,
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'haval192,4' => 128,
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'haval224,4' => 128,
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'haval256,4' => 128,
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'haval128,5' => 128,
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'haval160,5' => 128,
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'haval192,5' => 128,
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'haval224,5' => 128,
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'haval256,5' => 128,
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'md2' => 16,
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'md4' => 64,
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'md5' => 64,
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'ripemd128' => 64,
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'ripemd160' => 64,
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'ripemd256' => 64,
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'ripemd320' => 64,
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'salsa10' => 64,
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'salsa20' => 64,
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'sha1' => 64,
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'sha224' => 64,
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'sha256' => 64,
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'sha384' => 128,
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'sha512' => 128,
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'snefru' => 32,
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'snefru256' => 32,
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'tiger128,3' => 64,
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'tiger160,3' => 64,
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'tiger192,3' => 64,
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'tiger128,4' => 64,
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'tiger160,4' => 64,
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'tiger192,4' => 64,
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'whirlpool' => 64
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);
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if (isset($block_sizes[$algo], $password[$block_sizes[$algo]]))
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{
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$password = hash($algo, $password, TRUE);
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}
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$hash = '';
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// Note: Blocks are NOT 0-indexed
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for ($bc = (int) ceil($length / $hash_length), $bi = 1; $bi <= $bc; $bi++)
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{
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$key = $derived_key = hash_hmac($algo, $salt.pack('N', $bi), $password, TRUE);
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for ($i = 1; $i < $iterations; $i++)
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{
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$derived_key ^= $key = hash_hmac($algo, $key, $password, TRUE);
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}
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$hash .= $derived_key;
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}
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// This is not RFC-compatible, but we're aiming for natural PHP compatibility
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if ( ! $raw_output)
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{
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$hash = bin2hex($hash);
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}
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return defined('MB_OVERLOAD_STRING')
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? mb_substr($hash, 0, $length, '8bit')
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: substr($hash, 0, $length);
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}
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}
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