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   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   */
  36  class 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  ?>