1<?php
2/**
3 * Portable PHP password hashing framework.
4 * @package phpass
5 * @since 2.5.0
6 * @version 0.3 / WordPress
7 * @link http://www.openwall.com/phpass/
8 */
9
10#
11# Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
12# the public domain.  Revised in subsequent years, still public domain.
13#
14# There's absolutely no warranty.
15#
16# Please be sure to update the Version line if you edit this file in any way.
17# It is suggested that you leave the main version number intact, but indicate
18# your project name (after the slash) and add your own revision information.
19#
20# Please do not change the "private" password hashing method implemented in
21# here, thereby making your hashes incompatible.  However, if you must, please
22# change the hash type identifier (the "$P$") to something different.
23#
24# Obviously, since this code is in the public domain, the above are not
25# requirements (there can be none), but merely suggestions.
26#
27
28/**
29 * Portable PHP password hashing framework.
30 *
31 * @package phpass
32 * @version 0.3 / WordPress
33 * @link http://www.openwall.com/phpass/
34 * @since 2.5.0
35 */
36class PasswordHash {
37	var $itoa64;
38	var $iteration_count_log2;
39	var $portable_hashes;
40	var $random_state;
41
42	/**
43	 * PHP5 constructor.
44	 */
45	function __construct( $iteration_count_log2, $portable_hashes )
46	{
47		$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
48
49		if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31)
50			$iteration_count_log2 = 8;
51		$this->iteration_count_log2 = $iteration_count_log2;
52
53		$this->portable_hashes = $portable_hashes;
54
55		$this->random_state = microtime() . uniqid(rand(), TRUE); // removed getmypid() for compatibility reasons
56	}
57
58	/**
59	 * PHP4 constructor.
60	 */
61	public function PasswordHash( $iteration_count_log2, $portable_hashes ) {
62		self::__construct( $iteration_count_log2, $portable_hashes );
63	}
64
65	function get_random_bytes($count)
66	{
67		$output = '';
68		if ( @is_readable('/dev/urandom') &&
69		    ($fh = @fopen('/dev/urandom', 'rb'))) {
70			$output = fread($fh, $count);
71			fclose($fh);
72		}
73
74		if (strlen($output) < $count) {
75			$output = '';
76			for ($i = 0; $i < $count; $i += 16) {
77				$this->random_state =
78				    md5(microtime() . $this->random_state);
79				$output .=
80				    pack('H*', md5($this->random_state));
81			}
82			$output = substr($output, 0, $count);
83		}
84
85		return $output;
86	}
87
88	function encode64($input, $count)
89	{
90		$output = '';
91		$i = 0;
92		do {
93			$value = ord($input[$i++]);
94			$output .= $this->itoa64[$value & 0x3f];
95			if ($i < $count)
96				$value |= ord($input[$i]) << 8;
97			$output .= $this->itoa64[($value >> 6) & 0x3f];
98			if ($i++ >= $count)
99				break;
100			if ($i < $count)
101				$value |= ord($input[$i]) << 16;
102			$output .= $this->itoa64[($value >> 12) & 0x3f];
103			if ($i++ >= $count)
104				break;
105			$output .= $this->itoa64[($value >> 18) & 0x3f];
106		} while ($i < $count);
107
108		return $output;
109	}
110
111	function gensalt_private($input)
112	{
113		$output = '$P$';
114		$output .= $this->itoa64[min($this->iteration_count_log2 +
115			((PHP_VERSION >= '5') ? 5 : 3), 30)];
116		$output .= $this->encode64($input, 6);
117
118		return $output;
119	}
120
121	function crypt_private($password, $setting)
122	{
123		$output = '*0';
124		if (substr($setting, 0, 2) == $output)
125			$output = '*1';
126
127		$id = substr($setting, 0, 3);
128		# We use "$P$", phpBB3 uses "$H$" for the same thing
129		if ($id != '$P$' && $id != '$H$')
130			return $output;
131
132		$count_log2 = strpos($this->itoa64, $setting[3]);
133		if ($count_log2 < 7 || $count_log2 > 30)
134			return $output;
135
136		$count = 1 << $count_log2;
137
138		$salt = substr($setting, 4, 8);
139		if (strlen($salt) != 8)
140			return $output;
141
142		# We're kind of forced to use MD5 here since it's the only
143		# cryptographic primitive available in all versions of PHP
144		# currently in use.  To implement our own low-level crypto
145		# in PHP would result in much worse performance and
146		# consequently in lower iteration counts and hashes that are
147		# quicker to crack (by non-PHP code).
148		if (PHP_VERSION >= '5') {
149			$hash = md5($salt . $password, TRUE);
150			do {
151				$hash = md5($hash . $password, TRUE);
152			} while (--$count);
153		} else {
154			$hash = pack('H*', md5($salt . $password));
155			do {
156				$hash = pack('H*', md5($hash . $password));
157			} while (--$count);
158		}
159
160		$output = substr($setting, 0, 12);
161		$output .= $this->encode64($hash, 16);
162
163		return $output;
164	}
165
166	function gensalt_extended($input)
167	{
168		$count_log2 = min($this->iteration_count_log2 + 8, 24);
169		# This should be odd to not reveal weak DES keys, and the
170		# maximum valid value is (2**24 - 1) which is odd anyway.
171		$count = (1 << $count_log2) - 1;
172
173		$output = '_';
174		$output .= $this->itoa64[$count & 0x3f];
175		$output .= $this->itoa64[($count >> 6) & 0x3f];
176		$output .= $this->itoa64[($count >> 12) & 0x3f];
177		$output .= $this->itoa64[($count >> 18) & 0x3f];
178
179		$output .= $this->encode64($input, 3);
180
181		return $output;
182	}
183
184	function gensalt_blowfish($input)
185	{
186		# This one needs to use a different order of characters and a
187		# different encoding scheme from the one in encode64() above.
188		# We care because the last character in our encoded string will
189		# only represent 2 bits.  While two known implementations of
190		# bcrypt will happily accept and correct a salt string which
191		# has the 4 unused bits set to non-zero, we do not want to take
192		# chances and we also do not want to waste an additional byte
193		# of entropy.
194		$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
195
196		$output = '$2a$';
197		$output .= chr(ord('0') + $this->iteration_count_log2 / 10);
198		$output .= chr(ord('0') + $this->iteration_count_log2 % 10);
199		$output .= '$';
200
201		$i = 0;
202		do {
203			$c1 = ord($input[$i++]);
204			$output .= $itoa64[$c1 >> 2];
205			$c1 = ($c1 & 0x03) << 4;
206			if ($i >= 16) {
207				$output .= $itoa64[$c1];
208				break;
209			}
210
211			$c2 = ord($input[$i++]);
212			$c1 |= $c2 >> 4;
213			$output .= $itoa64[$c1];
214			$c1 = ($c2 & 0x0f) << 2;
215
216			$c2 = ord($input[$i++]);
217			$c1 |= $c2 >> 6;
218			$output .= $itoa64[$c1];
219			$output .= $itoa64[$c2 & 0x3f];
220		} while (1);
221
222		return $output;
223	}
224
225	function HashPassword($password)
226	{
227		if ( strlen( $password ) > 4096 ) {
228			return '*';
229		}
230
231		$random = '';
232
233		if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
234			$random = $this->get_random_bytes(16);
235			$hash =
236			    crypt($password, $this->gensalt_blowfish($random));
237			if (strlen($hash) == 60)
238				return $hash;
239		}
240
241		if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
242			if (strlen($random) < 3)
243				$random = $this->get_random_bytes(3);
244			$hash =
245			    crypt($password, $this->gensalt_extended($random));
246			if (strlen($hash) == 20)
247				return $hash;
248		}
249
250		if (strlen($random) < 6)
251			$random = $this->get_random_bytes(6);
252		$hash =
253		    $this->crypt_private($password,
254		    $this->gensalt_private($random));
255		if (strlen($hash) == 34)
256			return $hash;
257
258		# Returning '*' on error is safe here, but would _not_ be safe
259		# in a crypt(3)-like function used _both_ for generating new
260		# hashes and for validating passwords against existing hashes.
261		return '*';
262	}
263
264	function CheckPassword($password, $stored_hash)
265	{
266		if ( strlen( $password ) > 4096 ) {
267			return false;
268		}
269
270		$hash = $this->crypt_private($password, $stored_hash);
271		if ($hash[0] == '*')
272			$hash = crypt($password, $stored_hash);
273
274		return $hash === $stored_hash;
275	}
276}
277
278?>
279