[Summary view] [Print] [Text view]

   1  <?php
   2  /**
   3   * Portable PHP password hashing framework.
   4   * @package phpass
   5   * @since 2.5.0
   6   * @version 0.5 / WordPress
   7   * @link https://www.openwall.com/phpass/
   8   */
   9  
  10  #
  11  # Portable PHP password hashing framework.
  12  #
  13  # Version 0.5.4 / WordPress.
  14  #
  15  # Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
  16  # the public domain.  Revised in subsequent years, still public domain.
  17  #
  18  # There's absolutely no warranty.
  19  #
  20  # The homepage URL for this framework is:
  21  #
  22  #    http://www.openwall.com/phpass/
  23  #
  24  # Please be sure to update the Version line if you edit this file in any way.
  25  # It is suggested that you leave the main version number intact, but indicate
  26  # your project name (after the slash) and add your own revision information.
  27  #
  28  # Please do not change the "private" password hashing method implemented in
  29  # here, thereby making your hashes incompatible.  However, if you must, please
  30  # change the hash type identifier (the "$P$") to something different.
  31  #
  32  # Obviously, since this code is in the public domain, the above are not
  33  # requirements (there can be none), but merely suggestions.
  34  #
  35  
  36  /**
  37   * Portable PHP password hashing framework.
  38   *
  39   * @package phpass
  40   * @version 0.5 / WordPress
  41   * @link https://www.openwall.com/phpass/
  42   * @since 2.5.0
  43   */
  44  class PasswordHash {
  45      var $itoa64;
  46      var $iteration_count_log2;
  47      var $portable_hashes;
  48      var $random_state;
  49  
  50  	function __construct($iteration_count_log2, $portable_hashes)
  51      {
  52          $this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
  53  
  54          if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31) {
  55              $iteration_count_log2 = 8;
  56          }
  57          $this->iteration_count_log2 = $iteration_count_log2;
  58  
  59          $this->portable_hashes = $portable_hashes;
  60  
  61          $this->random_state = microtime();
  62          if (function_exists('getmypid')) {
  63              $this->random_state .= getmypid();
  64          }
  65      }
  66  
  67  	function PasswordHash($iteration_count_log2, $portable_hashes)
  68      {
  69          self::__construct($iteration_count_log2, $portable_hashes);
  70      }
  71  
  72  	function get_random_bytes($count)
  73      {
  74          $output = '';
  75          if (@is_readable('/dev/urandom') &&
  76              ($fh = @fopen('/dev/urandom', 'rb'))) {
  77              $output = fread($fh, $count);
  78              fclose($fh);
  79          }
  80  
  81          if (strlen($output) < $count) {
  82              $output = '';
  83              for ($i = 0; $i < $count; $i += 16) {
  84                  $this->random_state =
  85                      md5(microtime() . $this->random_state);
  86                  $output .= md5($this->random_state, TRUE);
  87              }
  88              $output = substr($output, 0, $count);
  89          }
  90  
  91          return $output;
  92      }
  93  
  94  	function encode64($input, $count)
  95      {
  96          $output = '';
  97          $i = 0;
  98          do {
  99              $value = ord($input[$i++]);
 100              $output .= $this->itoa64[$value & 0x3f];
 101              if ($i < $count) {
 102                  $value |= ord($input[$i]) << 8;
 103              }
 104              $output .= $this->itoa64[($value >> 6) & 0x3f];
 105              if ($i++ >= $count) {
 106                  break;
 107              }
 108              if ($i < $count) {
 109                  $value |= ord($input[$i]) << 16;
 110              }
 111              $output .= $this->itoa64[($value >> 12) & 0x3f];
 112              if ($i++ >= $count) {
 113                  break;
 114              }
 115              $output .= $this->itoa64[($value >> 18) & 0x3f];
 116          } while ($i < $count);
 117  
 118          return $output;
 119      }
 120  
 121  	function gensalt_private($input)
 122      {
 123          $output = '$P$';
 124          $output .= $this->itoa64[min($this->iteration_count_log2 + 5,
 125              30)];
 126          $output .= $this->encode64($input, 6);
 127  
 128          return $output;
 129      }
 130  
 131  	function crypt_private($password, $setting)
 132      {
 133          $output = '*0';
 134          if (substr($setting, 0, 2) === $output) {
 135              $output = '*1';
 136          }
 137  
 138          $id = substr($setting, 0, 3);
 139          # We use "$P$", phpBB3 uses "$H$" for the same thing
 140          if ($id !== '$P$' && $id !== '$H$') {
 141              return $output;
 142          }
 143  
 144          $count_log2 = strpos($this->itoa64, $setting[3]);
 145          if ($count_log2 < 7 || $count_log2 > 30) {
 146              return $output;
 147          }
 148  
 149          $count = 1 << $count_log2;
 150  
 151          $salt = substr($setting, 4, 8);
 152          if (strlen($salt) !== 8) {
 153              return $output;
 154          }
 155  
 156          # We were kind of forced to use MD5 here since it's the only
 157          # cryptographic primitive that was available in all versions
 158          # of PHP in use.  To implement our own low-level crypto in PHP
 159          # would have resulted in much worse performance and
 160          # consequently in lower iteration counts and hashes that are
 161          # quicker to crack (by non-PHP code).
 162          $hash = md5($salt . $password, TRUE);
 163          do {
 164              $hash = md5($hash . $password, TRUE);
 165          } while (--$count);
 166  
 167          $output = substr($setting, 0, 12);
 168          $output .= $this->encode64($hash, 16);
 169  
 170          return $output;
 171      }
 172  
 173  	function gensalt_blowfish($input)
 174      {
 175          # This one needs to use a different order of characters and a
 176          # different encoding scheme from the one in encode64() above.
 177          # We care because the last character in our encoded string will
 178          # only represent 2 bits.  While two known implementations of
 179          # bcrypt will happily accept and correct a salt string which
 180          # has the 4 unused bits set to non-zero, we do not want to take
 181          # chances and we also do not want to waste an additional byte
 182          # of entropy.
 183          $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
 184  
 185          $output = '$2a$';
 186          $output .= chr((int)(ord('0') + $this->iteration_count_log2 / 10));
 187          $output .= chr(ord('0') + $this->iteration_count_log2 % 10);
 188          $output .= '$';
 189  
 190          $i = 0;
 191          do {
 192              $c1 = ord($input[$i++]);
 193              $output .= $itoa64[$c1 >> 2];
 194              $c1 = ($c1 & 0x03) << 4;
 195              if ($i >= 16) {
 196                  $output .= $itoa64[$c1];
 197                  break;
 198              }
 199  
 200              $c2 = ord($input[$i++]);
 201              $c1 |= $c2 >> 4;
 202              $output .= $itoa64[$c1];
 203              $c1 = ($c2 & 0x0f) << 2;
 204  
 205              $c2 = ord($input[$i++]);
 206              $c1 |= $c2 >> 6;
 207              $output .= $itoa64[$c1];
 208              $output .= $itoa64[$c2 & 0x3f];
 209          } while (1);
 210  
 211          return $output;
 212      }
 213  
 214  	function HashPassword($password)
 215      {
 216          if ( strlen( $password ) > 4096 ) {
 217              return '*';
 218          }
 219  
 220          $random = '';
 221  
 222          if (CRYPT_BLOWFISH === 1 && !$this->portable_hashes) {
 223              $random = $this->get_random_bytes(16);
 224              $hash =
 225                  crypt($password, $this->gensalt_blowfish($random));
 226              if (strlen($hash) === 60) {
 227                  return $hash;
 228              }
 229          }
 230  
 231          if (strlen($random) < 6) {
 232              $random = $this->get_random_bytes(6);
 233          }
 234          $hash =
 235              $this->crypt_private($password,
 236              $this->gensalt_private($random));
 237          if (strlen($hash) === 34) {
 238              return $hash;
 239          }
 240  
 241          # Returning '*' on error is safe here, but would _not_ be safe
 242          # in a crypt(3)-like function used _both_ for generating new
 243          # hashes and for validating passwords against existing hashes.
 244          return '*';
 245      }
 246  
 247  	function CheckPassword($password, $stored_hash)
 248      {
 249          if ( strlen( $password ) > 4096 ) {
 250              return false;
 251          }
 252  
 253          $hash = $this->crypt_private($password, $stored_hash);
 254          if ($hash[0] === '*') {
 255              $hash = crypt($password, $stored_hash);
 256          }
 257  
 258          # This is not constant-time.  In order to keep the code simple,
 259          # for timing safety we currently rely on the salts being
 260          # unpredictable, which they are at least in the non-fallback
 261          # cases (that is, when we use /dev/urandom and bcrypt).
 262          return $hash === $stored_hash;
 263      }
 264  }