source: trunk/www.guidonia.net/wp/wp-includes/class-phpass.php@ 44

Last change on this file since 44 was 44, checked in by luciano, 15 years ago
File size: 6.6 KB
Line 
1<?php
2/**
3 * Portable PHP password hashing framework.
4 * @package phpass
5 * @since 2.5
6 * @version 0.1
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.
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 0.1 / genuine
33 * @link http://www.openwall.com/phpass/
34 * @since 2.5
35 */
36class PasswordHash {
37 var $itoa64;
38 var $iteration_count_log2;
39 var $portable_hashes;
40 var $random_state;
41
42 function PasswordHash($iteration_count_log2, $portable_hashes)
43 {
44 $this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
45
46 if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31)
47 $iteration_count_log2 = 8;
48 $this->iteration_count_log2 = $iteration_count_log2;
49
50 $this->portable_hashes = $portable_hashes;
51
52 $this->random_state = microtime() . (function_exists('getmypid') ? getmypid() : '') . uniqid(rand(), TRUE);
53
54 }
55
56 function get_random_bytes($count)
57 {
58 $output = '';
59 if (($fh = @fopen('/dev/urandom', 'rb'))) {
60 $output = fread($fh, $count);
61 fclose($fh);
62 }
63
64 if (strlen($output) < $count) {
65 $output = '';
66 for ($i = 0; $i < $count; $i += 16) {
67 $this->random_state =
68 md5(microtime() . $this->random_state);
69 $output .=
70 pack('H*', md5($this->random_state));
71 }
72 $output = substr($output, 0, $count);
73 }
74
75 return $output;
76 }
77
78 function encode64($input, $count)
79 {
80 $output = '';
81 $i = 0;
82 do {
83 $value = ord($input[$i++]);
84 $output .= $this->itoa64[$value & 0x3f];
85 if ($i < $count)
86 $value |= ord($input[$i]) << 8;
87 $output .= $this->itoa64[($value >> 6) & 0x3f];
88 if ($i++ >= $count)
89 break;
90 if ($i < $count)
91 $value |= ord($input[$i]) << 16;
92 $output .= $this->itoa64[($value >> 12) & 0x3f];
93 if ($i++ >= $count)
94 break;
95 $output .= $this->itoa64[($value >> 18) & 0x3f];
96 } while ($i < $count);
97
98 return $output;
99 }
100
101 function gensalt_private($input)
102 {
103 $output = '$P$';
104 $output .= $this->itoa64[min($this->iteration_count_log2 +
105 ((PHP_VERSION >= '5') ? 5 : 3), 30)];
106 $output .= $this->encode64($input, 6);
107
108 return $output;
109 }
110
111 function crypt_private($password, $setting)
112 {
113 $output = '*0';
114 if (substr($setting, 0, 2) == $output)
115 $output = '*1';
116
117 if (substr($setting, 0, 3) != '$P$')
118 return $output;
119
120 $count_log2 = strpos($this->itoa64, $setting[3]);
121 if ($count_log2 < 7 || $count_log2 > 30)
122 return $output;
123
124 $count = 1 << $count_log2;
125
126 $salt = substr($setting, 4, 8);
127 if (strlen($salt) != 8)
128 return $output;
129
130 # We're kind of forced to use MD5 here since it's the only
131 # cryptographic primitive available in all versions of PHP
132 # currently in use. To implement our own low-level crypto
133 # in PHP would result in much worse performance and
134 # consequently in lower iteration counts and hashes that are
135 # quicker to crack (by non-PHP code).
136 if (PHP_VERSION >= '5') {
137 $hash = md5($salt . $password, TRUE);
138 do {
139 $hash = md5($hash . $password, TRUE);
140 } while (--$count);
141 } else {
142 $hash = pack('H*', md5($salt . $password));
143 do {
144 $hash = pack('H*', md5($hash . $password));
145 } while (--$count);
146 }
147
148 $output = substr($setting, 0, 12);
149 $output .= $this->encode64($hash, 16);
150
151 return $output;
152 }
153
154 function gensalt_extended($input)
155 {
156 $count_log2 = min($this->iteration_count_log2 + 8, 24);
157 # This should be odd to not reveal weak DES keys, and the
158 # maximum valid value is (2**24 - 1) which is odd anyway.
159 $count = (1 << $count_log2) - 1;
160
161 $output = '_';
162 $output .= $this->itoa64[$count & 0x3f];
163 $output .= $this->itoa64[($count >> 6) & 0x3f];
164 $output .= $this->itoa64[($count >> 12) & 0x3f];
165 $output .= $this->itoa64[($count >> 18) & 0x3f];
166
167 $output .= $this->encode64($input, 3);
168
169 return $output;
170 }
171
172 function gensalt_blowfish($input)
173 {
174 # This one needs to use a different order of characters and a
175 # different encoding scheme from the one in encode64() above.
176 # We care because the last character in our encoded string will
177 # only represent 2 bits. While two known implementations of
178 # bcrypt will happily accept and correct a salt string which
179 # has the 4 unused bits set to non-zero, we do not want to take
180 # chances and we also do not want to waste an additional byte
181 # of entropy.
182 $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
183
184 $output = '$2a$';
185 $output .= chr(ord('0') + $this->iteration_count_log2 / 10);
186 $output .= chr(ord('0') + $this->iteration_count_log2 % 10);
187 $output .= '$';
188
189 $i = 0;
190 do {
191 $c1 = ord($input[$i++]);
192 $output .= $itoa64[$c1 >> 2];
193 $c1 = ($c1 & 0x03) << 4;
194 if ($i >= 16) {
195 $output .= $itoa64[$c1];
196 break;
197 }
198
199 $c2 = ord($input[$i++]);
200 $c1 |= $c2 >> 4;
201 $output .= $itoa64[$c1];
202 $c1 = ($c2 & 0x0f) << 2;
203
204 $c2 = ord($input[$i++]);
205 $c1 |= $c2 >> 6;
206 $output .= $itoa64[$c1];
207 $output .= $itoa64[$c2 & 0x3f];
208 } while (1);
209
210 return $output;
211 }
212
213 function HashPassword($password)
214 {
215 $random = '';
216
217 if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
218 $random = $this->get_random_bytes(16);
219 $hash =
220 crypt($password, $this->gensalt_blowfish($random));
221 if (strlen($hash) == 60)
222 return $hash;
223 }
224
225 if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
226 if (strlen($random) < 3)
227 $random = $this->get_random_bytes(3);
228 $hash =
229 crypt($password, $this->gensalt_extended($random));
230 if (strlen($hash) == 20)
231 return $hash;
232 }
233
234 if (strlen($random) < 6)
235 $random = $this->get_random_bytes(6);
236 $hash =
237 $this->crypt_private($password,
238 $this->gensalt_private($random));
239 if (strlen($hash) == 34)
240 return $hash;
241
242 # Returning '*' on error is safe here, but would _not_ be safe
243 # in a crypt(3)-like function used _both_ for generating new
244 # hashes and for validating passwords against existing hashes.
245 return '*';
246 }
247
248 function CheckPassword($password, $stored_hash)
249 {
250 $hash = $this->crypt_private($password, $stored_hash);
251 if ($hash[0] == '*')
252 $hash = crypt($password, $stored_hash);
253
254 return $hash == $stored_hash;
255 }
256}
257
258?>
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