| Textpattern | PHP Cross Reference | Content Management Systems |
1 <?php 2 # 3 # Portable PHP password hashing framework. 4 # 5 # Version 0.4 / 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 $random_state; 32 33 function __construct($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 ?>
title
Description
Body
title
Description
Body
title
Description
Body
title
Body
title