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Merge pull request #1425 from YOURLS/Fix-GeoIP
[Github/YOURLS.git] / includes / phpass / PasswordHash.php
1 <?php
2 #
3 # Portable PHP password hashing framework.
4 #
5 # Version 0.3 / genuine.
6 #
7 # Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
8 # the public domain.  Revised in subsequent years, still public domain.
9 #
10 # There's absolutely no warranty.
11 #
12 # The homepage URL for this framework is:
13 #
14 #       http://www.openwall.com/phpass/
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 class PasswordHash {
28         var $itoa64;
29         var $iteration_count_log2;
30         var $portable_hashes;
31         var $random_state;
32
33         function PasswordHash($iteration_count_log2, $portable_hashes)
34         {
35                 $this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
36
37                 if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31)
38                         $iteration_count_log2 = 8;
39                 $this->iteration_count_log2 = $iteration_count_log2;
40
41                 $this->portable_hashes = $portable_hashes;
42
43                 $this->random_state = microtime();
44                 if (function_exists('getmypid'))
45                         $this->random_state .= getmypid();
46         }
47
48         function get_random_bytes($count)
49         {
50                 $output = '';
51                 if (is_readable('/dev/urandom') &&
52                     ($fh = @fopen('/dev/urandom', 'rb'))) {
53                         $output = fread($fh, $count);
54                         fclose($fh);
55                 }
56
57                 if (strlen($output) < $count) {
58                         $output = '';
59                         for ($i = 0; $i < $count; $i += 16) {
60                                 $this->random_state =
61                                     md5(microtime() . $this->random_state);
62                                 $output .=
63                                     pack('H*', md5($this->random_state));
64                         }
65                         $output = substr($output, 0, $count);
66                 }
67
68                 return $output;
69         }
70
71         function encode64($input, $count)
72         {
73                 $output = '';
74                 $i = 0;
75                 do {
76                         $value = ord($input[$i++]);
77                         $output .= $this->itoa64[$value & 0x3f];
78                         if ($i < $count)
79                                 $value |= ord($input[$i]) << 8;
80                         $output .= $this->itoa64[($value >> 6) & 0x3f];
81                         if ($i++ >= $count)
82                                 break;
83                         if ($i < $count)
84                                 $value |= ord($input[$i]) << 16;
85                         $output .= $this->itoa64[($value >> 12) & 0x3f];
86                         if ($i++ >= $count)
87                                 break;
88                         $output .= $this->itoa64[($value >> 18) & 0x3f];
89                 } while ($i < $count);
90
91                 return $output;
92         }
93
94         function gensalt_private($input)
95         {
96                 $output = '$P$';
97                 $output .= $this->itoa64[min($this->iteration_count_log2 +
98                         ((PHP_VERSION >= '5') ? 5 : 3), 30)];
99                 $output .= $this->encode64($input, 6);
100
101                 return $output;
102         }
103
104         function crypt_private($password, $setting)
105         {
106                 $output = '*0';
107                 if (substr($setting, 0, 2) == $output)
108                         $output = '*1';
109
110                 $id = substr($setting, 0, 3);
111                 # We use "$P$", phpBB3 uses "$H$" for the same thing
112                 if ($id != '$P$' && $id != '$H$')
113                         return $output;
114
115                 $count_log2 = strpos($this->itoa64, $setting[3]);
116                 if ($count_log2 < 7 || $count_log2 > 30)
117                         return $output;
118
119                 $count = 1 << $count_log2;
120
121                 $salt = substr($setting, 4, 8);
122                 if (strlen($salt) != 8)
123                         return $output;
124
125                 # We're kind of forced to use MD5 here since it's the only
126                 # cryptographic primitive available in all versions of PHP
127                 # currently in use.  To implement our own low-level crypto
128                 # in PHP would result in much worse performance and
129                 # consequently in lower iteration counts and hashes that are
130                 # quicker to crack (by non-PHP code).
131                 if (PHP_VERSION >= '5') {
132                         $hash = md5($salt . $password, TRUE);
133                         do {
134                                 $hash = md5($hash . $password, TRUE);
135                         } while (--$count);
136                 } else {
137                         $hash = pack('H*', md5($salt . $password));
138                         do {
139                                 $hash = pack('H*', md5($hash . $password));
140                         } while (--$count);
141                 }
142
143                 $output = substr($setting, 0, 12);
144                 $output .= $this->encode64($hash, 16);
145
146                 return $output;
147         }
148
149         function gensalt_extended($input)
150         {
151                 $count_log2 = min($this->iteration_count_log2 + 8, 24);
152                 # This should be odd to not reveal weak DES keys, and the
153                 # maximum valid value is (2**24 - 1) which is odd anyway.
154                 $count = (1 << $count_log2) - 1;
155
156                 $output = '_';
157                 $output .= $this->itoa64[$count & 0x3f];
158                 $output .= $this->itoa64[($count >> 6) & 0x3f];
159                 $output .= $this->itoa64[($count >> 12) & 0x3f];
160                 $output .= $this->itoa64[($count >> 18) & 0x3f];
161
162                 $output .= $this->encode64($input, 3);
163
164                 return $output;
165         }
166
167         function gensalt_blowfish($input)
168         {
169                 # This one needs to use a different order of characters and a
170                 # different encoding scheme from the one in encode64() above.
171                 # We care because the last character in our encoded string will
172                 # only represent 2 bits.  While two known implementations of
173                 # bcrypt will happily accept and correct a salt string which
174                 # has the 4 unused bits set to non-zero, we do not want to take
175                 # chances and we also do not want to waste an additional byte
176                 # of entropy.
177                 $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
178
179                 $output = '$2a$';
180                 $output .= chr(ord('0') + $this->iteration_count_log2 / 10);
181                 $output .= chr(ord('0') + $this->iteration_count_log2 % 10);
182                 $output .= '$';
183
184                 $i = 0;
185                 do {
186                         $c1 = ord($input[$i++]);
187                         $output .= $itoa64[$c1 >> 2];
188                         $c1 = ($c1 & 0x03) << 4;
189                         if ($i >= 16) {
190                                 $output .= $itoa64[$c1];
191                                 break;
192                         }
193
194                         $c2 = ord($input[$i++]);
195                         $c1 |= $c2 >> 4;
196                         $output .= $itoa64[$c1];
197                         $c1 = ($c2 & 0x0f) << 2;
198
199                         $c2 = ord($input[$i++]);
200                         $c1 |= $c2 >> 6;
201                         $output .= $itoa64[$c1];
202                         $output .= $itoa64[$c2 & 0x3f];
203                 } while (1);
204
205                 return $output;
206         }
207
208         function HashPassword($password)
209         {
210                 $random = '';
211
212                 if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
213                         $random = $this->get_random_bytes(16);
214                         $hash =
215                             crypt($password, $this->gensalt_blowfish($random));
216                         if (strlen($hash) == 60)
217                                 return $hash;
218                 }
219
220                 if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
221                         if (strlen($random) < 3)
222                                 $random = $this->get_random_bytes(3);
223                         $hash =
224                             crypt($password, $this->gensalt_extended($random));
225                         if (strlen($hash) == 20)
226                                 return $hash;
227                 }
228
229                 if (strlen($random) < 6)
230                         $random = $this->get_random_bytes(6);
231                 $hash =
232                     $this->crypt_private($password,
233                     $this->gensalt_private($random));
234                 if (strlen($hash) == 34)
235                         return $hash;
236
237                 # Returning '*' on error is safe here, but would _not_ be safe
238                 # in a crypt(3)-like function used _both_ for generating new
239                 # hashes and for validating passwords against existing hashes.
240                 return '*';
241         }
242
243         function CheckPassword($password, $stored_hash)
244         {
245                 $hash = $this->crypt_private($password, $stored_hash);
246                 if ($hash[0] == '*')
247                         $hash = crypt($password, $stored_hash);
248
249                 return $hash == $stored_hash;
250         }
251 }
252
253 ?>