summaryrefslogtreecommitdiffstats
path: root/system/core/compat/hash.php
blob: 532c58494c4edf8ddac83aeacf63e4e6a425ecf3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2018, British Columbia Institute of Technology
 *
 * 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.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2018, British Columbia Institute of Technology (https://bcit.ca/)
 * @license	https://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 3.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * PHP ext/hash compatibility package
 *
 * @package		CodeIgniter
 * @subpackage	CodeIgniter
 * @category	Compatibility
 * @author		Andrey Andreev
 * @link		https://codeigniter.com/user_guide/
 * @link		https://secure.php.net/hash
 */

// ------------------------------------------------------------------------

if (is_php('5.6'))
{
	return;
}

// ------------------------------------------------------------------------

if ( ! function_exists('hash_equals'))
{
	/**
	 * hash_equals()
	 *
	 * @link	https://secure.php.net/hash_equals
	 * @param	string	$known_string
	 * @param	string	$user_string
	 * @return	bool
	 */
	function hash_equals($known_string, $user_string)
	{
		if ( ! is_string($known_string))
		{
			trigger_error('hash_equals(): Expected known_string to be a string, '.strtolower(gettype($known_string)).' given', E_USER_WARNING);
			return FALSE;
		}
		elseif ( ! is_string($user_string))
		{
			trigger_error('hash_equals(): Expected user_string to be a string, '.strtolower(gettype($user_string)).' given', E_USER_WARNING);
			return FALSE;
		}
		elseif (($length = strlen($known_string)) !== strlen($user_string))
		{
			return FALSE;
		}

		$diff = 0;
		for ($i = 0; $i < $length; $i++)
		{
			$diff |= ord($known_string[$i]) ^ ord($user_string[$i]);
		}

		return ($diff === 0);
	}
}

// ------------------------------------------------------------------------

if (is_php('5.5'))
{
	return;
}

// ------------------------------------------------------------------------

if ( ! function_exists('hash_pbkdf2'))
{
	/**
	 * hash_pbkdf2()
	 *
	 * @link	https://secure.php.net/hash_pbkdf2
	 * @param	string	$algo
	 * @param	string	$password
	 * @param	string	$salt
	 * @param	int	$iterations
	 * @param	int	$length
	 * @param	bool	$raw_output
	 * @return	string
	 */
	function hash_pbkdf2($algo, $password, $salt, $iterations, $length = 0, $raw_output = FALSE)
	{
		if ( ! in_array(strtolower($algo), hash_algos(), TRUE))
		{
			trigger_error('hash_pbkdf2(): Unknown hashing algorithm: '.$algo, E_USER_WARNING);
			return FALSE;
		}

		if (($type = gettype($iterations)) !== 'integer')
		{
			if ($type === 'object' && method_exists($iterations, '__toString'))
			{
				$iterations = (string) $iterations;
			}

			if (is_string($iterations) && is_numeric($iterations))
			{
				$iterations = (int) $iterations;
			}
			else
			{
				trigger_error('hash_pbkdf2() expects parameter 4 to be long, '.$type.' given', E_USER_WARNING);
				return NULL;
			}
		}

		if ($iterations < 1)
		{
			trigger_error('hash_pbkdf2(): Iterations must be a positive integer: '.$iterations, E_USER_WARNING);
			return FALSE;
		}

		if (($type = gettype($length)) !== 'integer')
		{
			if ($type === 'object' && method_exists($length, '__toString'))
			{
				$length = (string) $length;
			}

			if (is_string($length) && is_numeric($length))
			{
				$length = (int) $length;
			}
			else
			{
				trigger_error('hash_pbkdf2() expects parameter 5 to be long, '.$type.' given', E_USER_WARNING);
				return NULL;
			}
		}

		if ($length < 0)
		{
			trigger_error('hash_pbkdf2(): Length must be greater than or equal to 0: '.$length, E_USER_WARNING);
			return FALSE;
		}

		$hash_length = defined('MB_OVERLOAD_STRING')
			? mb_strlen(hash($algo, NULL, TRUE), '8bit')
			: strlen(hash($algo, NULL, TRUE));
		empty($length) && $length = $hash_length;

		// Pre-hash password inputs longer than the algorithm's block size
		// (i.e. prepare HMAC key) to mitigate potential DoS attacks.
		static $block_sizes;
		empty($block_sizes) && $block_sizes = array(
			'gost' => 32,
			'haval128,3' => 128,
			'haval160,3' => 128,
			'haval192,3' => 128,
			'haval224,3' => 128,
			'haval256,3' => 128,
			'haval128,4' => 128,
			'haval160,4' => 128,
			'haval192,4' => 128,
			'haval224,4' => 128,
			'haval256,4' => 128,
			'haval128,5' => 128,
			'haval160,5' => 128,
			'haval192,5' => 128,
			'haval224,5' => 128,
			'haval256,5' => 128,
			'md2' => 16,
			'md4' => 64,
			'md5' => 64,
			'ripemd128' => 64,
			'ripemd160' => 64,
			'ripemd256' => 64,
			'ripemd320' => 64,
			'sha1' => 64,
			'sha224' => 64,
			'sha256' => 64,
			'sha384' => 128,
			'sha512' => 128,
			'snefru' => 32,
			'snefru256' => 32,
			'tiger128,3' => 64,
			'tiger160,3' => 64,
			'tiger192,3' => 64,
			'tiger128,4' => 64,
			'tiger160,4' => 64,
			'tiger192,4' => 64,
			'whirlpool' => 64
		);

		if (isset($block_sizes[$algo], $password[$block_sizes[$algo]]))
		{
			$password = hash($algo, $password, TRUE);
		}

		$hash = '';
		// Note: Blocks are NOT 0-indexed
		for ($bc = (int) ceil($length / $hash_length), $bi = 1; $bi <= $bc; $bi++)
		{
			$key = $derived_key = hash_hmac($algo, $salt.pack('N', $bi), $password, TRUE);
			for ($i = 1; $i < $iterations; $i++)
			{
				$derived_key ^= $key = hash_hmac($algo, $key, $password, TRUE);
			}

			$hash .= $derived_key;
		}

		// This is not RFC-compatible, but we're aiming for natural PHP compatibility
		if ( ! $raw_output)
		{
			$hash = bin2hex($hash);
		}

		return defined('MB_OVERLOAD_STRING')
			? mb_substr($hash, 0, $length, '8bit')
			: substr($hash, 0, $length);
	}
}