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   1  <?php
   2  #
   3  # Portable PHP password hashing framework.
   4  #
   5  # Version 0.1 / genuine.
   6  #
   7  # Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
   8  # the 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          $this->random_state = microtime() . getmypid();
  44      }
  45  
  46  	function get_random_bytes($count)
  47      {
  48          $output = '';
  49          if (($fh = @fopen('/dev/urandom', 'rb'))) {
  50              $output = fread($fh, $count);
  51              fclose($fh);
  52          }
  53  
  54          if (strlen($output) < $count) {
  55              $output = '';
  56              for ($i = 0; $i < $count; $i += 16) {
  57                  $this->random_state =
  58                      md5(microtime() . $this->random_state);
  59                  $output .=
  60                      pack('H*', md5($this->random_state));
  61              }
  62              $output = substr($output, 0, $count);
  63          }
  64  
  65          return $output;
  66      }
  67  
  68  	function encode64($input, $count)
  69      {
  70          $output = '';
  71          $i = 0;
  72          do {
  73              $value = ord($input[$i++]);
  74              $output .= $this->itoa64[$value & 0x3f];
  75              if ($i < $count)
  76                  $value |= ord($input[$i]) << 8;
  77              $output .= $this->itoa64[($value >> 6) & 0x3f];
  78              if ($i++ >= $count)
  79                  break;
  80              if ($i < $count)
  81                  $value |= ord($input[$i]) << 16;
  82              $output .= $this->itoa64[($value >> 12) & 0x3f];
  83              if ($i++ >= $count)
  84                  break;
  85              $output .= $this->itoa64[($value >> 18) & 0x3f];
  86          } while ($i < $count);
  87  
  88          return $output;
  89      }
  90  
  91  	function gensalt_private($input)
  92      {
  93          $output = '$P$';
  94          $output .= $this->itoa64[min($this->iteration_count_log2 +
  95              ((PHP_VERSION >= '5') ? 5 : 3), 30)];
  96          $output .= $this->encode64($input, 6);
  97  
  98          return $output;
  99      }
 100  
 101  	function crypt_private($password, $setting)
 102      {
 103          $output = '*0';
 104          if (substr($setting, 0, 2) == $output)
 105              $output = '*1';
 106  
 107          if (substr($setting, 0, 3) != '$P$')
 108              return $output;
 109  
 110          $count_log2 = strpos($this->itoa64, $setting[3]);
 111          if ($count_log2 < 7 || $count_log2 > 30)
 112              return $output;
 113  
 114          $count = 1 << $count_log2;
 115  
 116          $salt = substr($setting, 4, 8);
 117          if (strlen($salt) != 8)
 118              return $output;
 119  
 120          # We're kind of forced to use MD5 here since it's the only
 121          # cryptographic primitive available in all versions of PHP
 122          # currently in use.  To implement our own low-level crypto
 123          # in PHP would result in much worse performance and
 124          # consequently in lower iteration counts and hashes that are
 125          # quicker to crack (by non-PHP code).
 126          if (PHP_VERSION >= '5') {
 127              $hash = md5($salt . $password, TRUE);
 128              do {
 129                  $hash = md5($hash . $password, TRUE);
 130              } while (--$count);
 131          } else {
 132              $hash = pack('H*', md5($salt . $password));
 133              do {
 134                  $hash = pack('H*', md5($hash . $password));
 135              } while (--$count);
 136          }
 137  
 138          $output = substr($setting, 0, 12);
 139          $output .= $this->encode64($hash, 16);
 140  
 141          return $output;
 142      }
 143  
 144  	function gensalt_extended($input)
 145      {
 146          $count_log2 = min($this->iteration_count_log2 + 8, 24);
 147          # This should be odd to not reveal weak DES keys, and the
 148          # maximum valid value is (2**24 - 1) which is odd anyway.
 149          $count = (1 << $count_log2) - 1;
 150  
 151          $output = '_';
 152          $output .= $this->itoa64[$count & 0x3f];
 153          $output .= $this->itoa64[($count >> 6) & 0x3f];
 154          $output .= $this->itoa64[($count >> 12) & 0x3f];
 155          $output .= $this->itoa64[($count >> 18) & 0x3f];
 156  
 157          $output .= $this->encode64($input, 3);
 158  
 159          return $output;
 160      }
 161  
 162  	function gensalt_blowfish($input)
 163      {
 164          # This one needs to use a different order of characters and a
 165          # different encoding scheme from the one in encode64() above.
 166          # We care because the last character in our encoded string will
 167          # only represent 2 bits.  While two known implementations of
 168          # bcrypt will happily accept and correct a salt string which
 169          # has the 4 unused bits set to non-zero, we do not want to take
 170          # chances and we also do not want to waste an additional byte
 171          # of entropy.
 172          $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
 173  
 174          $output = '$2a$';
 175          $output .= chr(ord('0') + $this->iteration_count_log2 / 10);
 176          $output .= chr(ord('0') + $this->iteration_count_log2 % 10);
 177          $output .= '$';
 178  
 179          $i = 0;
 180          do {
 181              $c1 = ord($input[$i++]);
 182              $output .= $itoa64[$c1 >> 2];
 183              $c1 = ($c1 & 0x03) << 4;
 184              if ($i >= 16) {
 185                  $output .= $itoa64[$c1];
 186                  break;
 187              }
 188  
 189              $c2 = ord($input[$i++]);
 190              $c1 |= $c2 >> 4;
 191              $output .= $itoa64[$c1];
 192              $c1 = ($c2 & 0x0f) << 2;
 193  
 194              $c2 = ord($input[$i++]);
 195              $c1 |= $c2 >> 6;
 196              $output .= $itoa64[$c1];
 197              $output .= $itoa64[$c2 & 0x3f];
 198          } while (1);
 199  
 200          return $output;
 201      }
 202  
 203  	function HashPassword($password)
 204      {
 205          $random = '';
 206  
 207          if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
 208              $random = $this->get_random_bytes(16);
 209              $hash =
 210                  crypt($password, $this->gensalt_blowfish($random));
 211              if (strlen($hash) == 60)
 212                  return $hash;
 213          }
 214  
 215          if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
 216              if (strlen($random) < 3)
 217                  $random = $this->get_random_bytes(3);
 218              $hash =
 219                  crypt($password, $this->gensalt_extended($random));
 220              if (strlen($hash) == 20)
 221                  return $hash;
 222          }
 223  
 224          if (strlen($random) < 6)
 225              $random = $this->get_random_bytes(6);
 226          $hash =
 227              $this->crypt_private($password,
 228              $this->gensalt_private($random));
 229          if (strlen($hash) == 34)
 230              return $hash;
 231  
 232          # Returning '*' on error is safe here, but would _not_ be safe
 233          # in a crypt(3)-like function used _both_ for generating new
 234          # hashes and for validating passwords against existing hashes.
 235          return '*';
 236      }
 237  
 238  	function CheckPassword($password, $stored_hash)
 239      {
 240          $hash = $this->crypt_private($password, $stored_hash);
 241          if ($hash[0] == '*')
 242              $hash = crypt($password, $stored_hash);
 243  
 244          return $hash == $stored_hash;
 245      }
 246  }
 247  
 248  ?>