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   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 / 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          $this->iteration_count_log2 = $iteration_count_log2;
  57  
  58          $this->portable_hashes = $portable_hashes;
  59  
  60          $this->random_state = microtime();
  61          if (function_exists('getmypid'))
  62              $this->random_state .= getmypid();
  63      }
  64  
  65  	function PasswordHash($iteration_count_log2, $portable_hashes)
  66      {
  67          self::__construct($iteration_count_log2, $portable_hashes);
  68      }
  69  
  70  	function get_random_bytes($count)
  71      {
  72          $output = '';
  73          if (@is_readable('/dev/urandom') &&
  74              ($fh = @fopen('/dev/urandom', 'rb'))) {
  75              $output = fread($fh, $count);
  76              fclose($fh);
  77          }
  78  
  79          if (strlen($output) < $count) {
  80              $output = '';
  81              for ($i = 0; $i < $count; $i += 16) {
  82                  $this->random_state =
  83                      md5(microtime() . $this->random_state);
  84                  $output .= md5($this->random_state, TRUE);
  85              }
  86              $output = substr($output, 0, $count);
  87          }
  88  
  89          return $output;
  90      }
  91  
  92  	function encode64($input, $count)
  93      {
  94          $output = '';
  95          $i = 0;
  96          do {
  97              $value = ord($input[$i++]);
  98              $output .= $this->itoa64[$value & 0x3f];
  99              if ($i < $count)
 100                  $value |= ord($input[$i]) << 8;
 101              $output .= $this->itoa64[($value >> 6) & 0x3f];
 102              if ($i++ >= $count)
 103                  break;
 104              if ($i < $count)
 105                  $value |= ord($input[$i]) << 16;
 106              $output .= $this->itoa64[($value >> 12) & 0x3f];
 107              if ($i++ >= $count)
 108                  break;
 109              $output .= $this->itoa64[($value >> 18) & 0x3f];
 110          } while ($i < $count);
 111  
 112          return $output;
 113      }
 114  
 115  	function gensalt_private($input)
 116      {
 117          $output = '$P$';
 118          $output .= $this->itoa64[min($this->iteration_count_log2 +
 119              ((PHP_VERSION >= '5') ? 5 : 3), 30)];
 120          $output .= $this->encode64($input, 6);
 121  
 122          return $output;
 123      }
 124  
 125  	function crypt_private($password, $setting)
 126      {
 127          $output = '*0';
 128          if (substr($setting, 0, 2) === $output)
 129              $output = '*1';
 130  
 131          $id = substr($setting, 0, 3);
 132          # We use "$P$", phpBB3 uses "$H$" for the same thing
 133          if ($id !== '$P$' && $id !== '$H$')
 134              return $output;
 135  
 136          $count_log2 = strpos($this->itoa64, $setting[3]);
 137          if ($count_log2 < 7 || $count_log2 > 30)
 138              return $output;
 139  
 140          $count = 1 << $count_log2;
 141  
 142          $salt = substr($setting, 4, 8);
 143          if (strlen($salt) !== 8)
 144              return $output;
 145  
 146          # We were kind of forced to use MD5 here since it's the only
 147          # cryptographic primitive that was available in all versions
 148          # of PHP in use.  To implement our own low-level crypto in PHP
 149          # would have resulted in much worse performance and
 150          # consequently in lower iteration counts and hashes that are
 151          # quicker to crack (by non-PHP code).
 152          $hash = md5($salt . $password, TRUE);
 153          do {
 154              $hash = md5($hash . $password, TRUE);
 155          } while (--$count);
 156  
 157          $output = substr($setting, 0, 12);
 158          $output .= $this->encode64($hash, 16);
 159  
 160          return $output;
 161      }
 162  
 163  	function gensalt_blowfish($input)
 164      {
 165          # This one needs to use a different order of characters and a
 166          # different encoding scheme from the one in encode64() above.
 167          # We care because the last character in our encoded string will
 168          # only represent 2 bits.  While two known implementations of
 169          # bcrypt will happily accept and correct a salt string which
 170          # has the 4 unused bits set to non-zero, we do not want to take
 171          # chances and we also do not want to waste an additional byte
 172          # of entropy.
 173          $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
 174  
 175          $output = '$2a$';
 176          $output .= chr(ord('0') + $this->iteration_count_log2 / 10);
 177          $output .= chr(ord('0') + $this->iteration_count_log2 % 10);
 178          $output .= '$';
 179  
 180          $i = 0;
 181          do {
 182              $c1 = ord($input[$i++]);
 183              $output .= $itoa64[$c1 >> 2];
 184              $c1 = ($c1 & 0x03) << 4;
 185              if ($i >= 16) {
 186                  $output .= $itoa64[$c1];
 187                  break;
 188              }
 189  
 190              $c2 = ord($input[$i++]);
 191              $c1 |= $c2 >> 4;
 192              $output .= $itoa64[$c1];
 193              $c1 = ($c2 & 0x0f) << 2;
 194  
 195              $c2 = ord($input[$i++]);
 196              $c1 |= $c2 >> 6;
 197              $output .= $itoa64[$c1];
 198              $output .= $itoa64[$c2 & 0x3f];
 199          } while (1);
 200  
 201          return $output;
 202      }
 203  
 204  	function HashPassword($password)
 205      {
 206          if ( strlen( $password ) > 4096 ) {
 207              return '*';
 208          }
 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 $hash;
 218          }
 219  
 220          if (strlen($random) < 6)
 221              $random = $this->get_random_bytes(6);
 222          $hash =
 223              $this->crypt_private($password,
 224              $this->gensalt_private($random));
 225          if (strlen($hash) === 34)
 226              return $hash;
 227  
 228          # Returning '*' on error is safe here, but would _not_ be safe
 229          # in a crypt(3)-like function used _both_ for generating new
 230          # hashes and for validating passwords against existing hashes.
 231          return '*';
 232      }
 233  
 234  	function CheckPassword($password, $stored_hash)
 235      {
 236          if ( strlen( $password ) > 4096 ) {
 237              return false;
 238          }
 239  
 240          $hash = $this->crypt_private($password, $stored_hash);
 241          if ($hash[0] === '*')
 242              $hash = crypt($password, $stored_hash);
 243  
 244          # This is not constant-time.  In order to keep the code simple,
 245          # for timing safety we currently rely on the salts being
 246          # unpredictable, which they are at least in the non-fallback
 247          # cases (that is, when we use /dev/urandom and bcrypt).
 248          return $hash === $stored_hash;
 249      }
 250  }