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/wp-includes/ -> class-phpass.php (source)

   1  <?php
   2  /**
   3   * Portable PHP password hashing framework.
   4   * @package phpass
   5   * @since 2.5.0
   6   * @version 0.3 / WordPress
   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.  Revised in subsequent years, still 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 0.3 / WordPress
  33   * @link http://www.openwall.com/phpass/
  34   * @since 2.5.0
  35   */
  36  class PasswordHash {
  37      var $itoa64;
  38      var $iteration_count_log2;
  39      var $portable_hashes;
  40      var $random_state;
  41  
  42      /**
  43       * PHP5 constructor.
  44       */
  45  	function __construct( $iteration_count_log2, $portable_hashes )
  46      {
  47          $this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
  48  
  49          if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31)
  50              $iteration_count_log2 = 8;
  51          $this->iteration_count_log2 = $iteration_count_log2;
  52  
  53          $this->portable_hashes = $portable_hashes;
  54  
  55          $this->random_state = microtime() . uniqid(rand(), TRUE); // removed getmypid() for compatibility reasons
  56      }
  57  
  58      /**
  59       * PHP4 constructor.
  60       */
  61  	public function PasswordHash( $iteration_count_log2, $portable_hashes ) {
  62          self::__construct( $iteration_count_log2, $portable_hashes );
  63      }
  64  
  65  	function get_random_bytes($count)
  66      {
  67          $output = '';
  68          if ( @is_readable('/dev/urandom') &&
  69              ($fh = @fopen('/dev/urandom', 'rb'))) {
  70              $output = fread($fh, $count);
  71              fclose($fh);
  72          }
  73  
  74          if (strlen($output) < $count) {
  75              $output = '';
  76              for ($i = 0; $i < $count; $i += 16) {
  77                  $this->random_state =
  78                      md5(microtime() . $this->random_state);
  79                  $output .=
  80                      pack('H*', md5($this->random_state));
  81              }
  82              $output = substr($output, 0, $count);
  83          }
  84  
  85          return $output;
  86      }
  87  
  88  	function encode64($input, $count)
  89      {
  90          $output = '';
  91          $i = 0;
  92          do {
  93              $value = ord($input[$i++]);
  94              $output .= $this->itoa64[$value & 0x3f];
  95              if ($i < $count)
  96                  $value |= ord($input[$i]) << 8;
  97              $output .= $this->itoa64[($value >> 6) & 0x3f];
  98              if ($i++ >= $count)
  99                  break;
 100              if ($i < $count)
 101                  $value |= ord($input[$i]) << 16;
 102              $output .= $this->itoa64[($value >> 12) & 0x3f];
 103              if ($i++ >= $count)
 104                  break;
 105              $output .= $this->itoa64[($value >> 18) & 0x3f];
 106          } while ($i < $count);
 107  
 108          return $output;
 109      }
 110  
 111  	function gensalt_private($input)
 112      {
 113          $output = '$P$';
 114          $output .= $this->itoa64[min($this->iteration_count_log2 +
 115              ((PHP_VERSION >= '5') ? 5 : 3), 30)];
 116          $output .= $this->encode64($input, 6);
 117  
 118          return $output;
 119      }
 120  
 121  	function crypt_private($password, $setting)
 122      {
 123          $output = '*0';
 124          if (substr($setting, 0, 2) == $output)
 125              $output = '*1';
 126  
 127          $id = substr($setting, 0, 3);
 128          # We use "$P$", phpBB3 uses "$H$" for the same thing
 129          if ($id != '$P$' && $id != '$H$')
 130              return $output;
 131  
 132          $count_log2 = strpos($this->itoa64, $setting[3]);
 133          if ($count_log2 < 7 || $count_log2 > 30)
 134              return $output;
 135  
 136          $count = 1 << $count_log2;
 137  
 138          $salt = substr($setting, 4, 8);
 139          if (strlen($salt) != 8)
 140              return $output;
 141  
 142          # We're kind of forced to use MD5 here since it's the only
 143          # cryptographic primitive available in all versions of PHP
 144          # currently in use.  To implement our own low-level crypto
 145          # in PHP would result in much worse performance and
 146          # consequently in lower iteration counts and hashes that are
 147          # quicker to crack (by non-PHP code).
 148          if (PHP_VERSION >= '5') {
 149              $hash = md5($salt . $password, TRUE);
 150              do {
 151                  $hash = md5($hash . $password, TRUE);
 152              } while (--$count);
 153          } else {
 154              $hash = pack('H*', md5($salt . $password));
 155              do {
 156                  $hash = pack('H*', md5($hash . $password));
 157              } while (--$count);
 158          }
 159  
 160          $output = substr($setting, 0, 12);
 161          $output .= $this->encode64($hash, 16);
 162  
 163          return $output;
 164      }
 165  
 166  	function gensalt_extended($input)
 167      {
 168          $count_log2 = min($this->iteration_count_log2 + 8, 24);
 169          # This should be odd to not reveal weak DES keys, and the
 170          # maximum valid value is (2**24 - 1) which is odd anyway.
 171          $count = (1 << $count_log2) - 1;
 172  
 173          $output = '_';
 174          $output .= $this->itoa64[$count & 0x3f];
 175          $output .= $this->itoa64[($count >> 6) & 0x3f];
 176          $output .= $this->itoa64[($count >> 12) & 0x3f];
 177          $output .= $this->itoa64[($count >> 18) & 0x3f];
 178  
 179          $output .= $this->encode64($input, 3);
 180  
 181          return $output;
 182      }
 183  
 184  	function gensalt_blowfish($input)
 185      {
 186          # This one needs to use a different order of characters and a
 187          # different encoding scheme from the one in encode64() above.
 188          # We care because the last character in our encoded string will
 189          # only represent 2 bits.  While two known implementations of
 190          # bcrypt will happily accept and correct a salt string which
 191          # has the 4 unused bits set to non-zero, we do not want to take
 192          # chances and we also do not want to waste an additional byte
 193          # of entropy.
 194          $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
 195  
 196          $output = '$2a$';
 197          $output .= chr(ord('0') + $this->iteration_count_log2 / 10);
 198          $output .= chr(ord('0') + $this->iteration_count_log2 % 10);
 199          $output .= '$';
 200  
 201          $i = 0;
 202          do {
 203              $c1 = ord($input[$i++]);
 204              $output .= $itoa64[$c1 >> 2];
 205              $c1 = ($c1 & 0x03) << 4;
 206              if ($i >= 16) {
 207                  $output .= $itoa64[$c1];
 208                  break;
 209              }
 210  
 211              $c2 = ord($input[$i++]);
 212              $c1 |= $c2 >> 4;
 213              $output .= $itoa64[$c1];
 214              $c1 = ($c2 & 0x0f) << 2;
 215  
 216              $c2 = ord($input[$i++]);
 217              $c1 |= $c2 >> 6;
 218              $output .= $itoa64[$c1];
 219              $output .= $itoa64[$c2 & 0x3f];
 220          } while (1);
 221  
 222          return $output;
 223      }
 224  
 225  	function HashPassword($password)
 226      {
 227          if ( strlen( $password ) > 4096 ) {
 228              return '*';
 229          }
 230  
 231          $random = '';
 232  
 233          if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
 234              $random = $this->get_random_bytes(16);
 235              $hash =
 236                  crypt($password, $this->gensalt_blowfish($random));
 237              if (strlen($hash) == 60)
 238                  return $hash;
 239          }
 240  
 241          if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
 242              if (strlen($random) < 3)
 243                  $random = $this->get_random_bytes(3);
 244              $hash =
 245                  crypt($password, $this->gensalt_extended($random));
 246              if (strlen($hash) == 20)
 247                  return $hash;
 248          }
 249  
 250          if (strlen($random) < 6)
 251              $random = $this->get_random_bytes(6);
 252          $hash =
 253              $this->crypt_private($password,
 254              $this->gensalt_private($random));
 255          if (strlen($hash) == 34)
 256              return $hash;
 257  
 258          # Returning '*' on error is safe here, but would _not_ be safe
 259          # in a crypt(3)-like function used _both_ for generating new
 260          # hashes and for validating passwords against existing hashes.
 261          return '*';
 262      }
 263  
 264  	function CheckPassword($password, $stored_hash)
 265      {
 266          if ( strlen( $password ) > 4096 ) {
 267              return false;
 268          }
 269  
 270          $hash = $this->crypt_private($password, $stored_hash);
 271          if ($hash[0] == '*')
 272              $hash = crypt($password, $stored_hash);
 273  
 274          return $hash === $stored_hash;
 275      }
 276  }


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