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include/libs/PasswordHash.php

peshopbs2 Aug 8th, 2016 76 Never
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  1. <?php
  2. #
  3. # Portable PHP password hashing framework.
  4. #
  5. # Version 0.3 / genuine.
  6. #
  7. # Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
  8. # the public domain.  Revised in subsequent years, still 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();
  44.         if (function_exists('getmypid'))
  45.             $this->random_state .= getmypid();
  46.     }
  47.  
  48.     function get_random_bytes($count)
  49.     {
  50.         $output = '';
  51.         if (is_readable('/dev/urandom') &&
  52.             ($fh = @fopen('/dev/urandom', 'rb'))) {
  53.             $output = fread($fh, $count);
  54.             fclose($fh);
  55.         }
  56.  
  57.         if (strlen($output) < $count) {
  58.             $output = '';
  59.             for ($i = 0; $i < $count; $i += 16) {
  60.                 $this->random_state =
  61.                     md5(microtime() . $this->random_state);
  62.                 $output .=
  63.                     pack('H*', md5($this->random_state));
  64.             }
  65.             $output = substr($output, 0, $count);
  66.         }
  67.  
  68.         return $output;
  69.     }
  70.  
  71.     function encode64($input, $count)
  72.     {
  73.         $output = '';
  74.         $i = 0;
  75.         do {
  76.             $value = ord($input[$i++]);
  77.             $output .= $this->itoa64[$value & 0x3f];
  78.             if ($i < $count)
  79.                 $value |= ord($input[$i]) << 8;
  80.             $output .= $this->itoa64[($value >> 6) & 0x3f];
  81.             if ($i++ >= $count)
  82.                 break;
  83.             if ($i < $count)
  84.                 $value |= ord($input[$i]) << 16;
  85.             $output .= $this->itoa64[($value >> 12) & 0x3f];
  86.             if ($i++ >= $count)
  87.                 break;
  88.             $output .= $this->itoa64[($value >> 18) & 0x3f];
  89.         } while ($i < $count);
  90.  
  91.         return $output;
  92.     }
  93.  
  94.     function gensalt_private($input)
  95.     {
  96.         $output = '$P$';
  97.         $output .= $this->itoa64[min($this->iteration_count_log2 +
  98.             ((PHP_VERSION >= '5') ? 5 : 3), 30)];
  99.         $output .= $this->encode64($input, 6);
  100.  
  101.         return $output;
  102.     }
  103.  
  104.     function crypt_private($password, $setting)
  105.     {
  106.         $output = '*0';
  107.         if (substr($setting, 0, 2) == $output)
  108.             $output = '*1';
  109.  
  110.         $id = substr($setting, 0, 3);
  111.         # We use "$P$", phpBB3 uses "$H$" for the same thing
  112.         if ($id != '$P$' && $id != '$H$')
  113.             return $output;
  114.  
  115.         $count_log2 = strpos($this->itoa64, $setting[3]);
  116.         if ($count_log2 < 7 || $count_log2 > 30)
  117.             return $output;
  118.  
  119.         $count = 1 << $count_log2;
  120.  
  121.         $salt = substr($setting, 4, 8);
  122.         if (strlen($salt) != 8)
  123.             return $output;
  124.  
  125.         # We're kind of forced to use MD5 here since it's the only
  126.         # cryptographic primitive available in all versions of PHP
  127.         # currently in use.  To implement our own low-level crypto
  128.         # in PHP would result in much worse performance and
  129.         # consequently in lower iteration counts and hashes that are
  130.         # quicker to crack (by non-PHP code).
  131.         if (PHP_VERSION >= '5') {
  132.             $hash = md5($salt . $password, TRUE);
  133.             do {
  134.                 $hash = md5($hash . $password, TRUE);
  135.             } while (--$count);
  136.         } else {
  137.             $hash = pack('H*', md5($salt . $password));
  138.             do {
  139.                 $hash = pack('H*', md5($hash . $password));
  140.             } while (--$count);
  141.         }
  142.  
  143.         $output = substr($setting, 0, 12);
  144.         $output .= $this->encode64($hash, 16);
  145.  
  146.         return $output;
  147.     }
  148.  
  149.     function gensalt_extended($input)
  150.     {
  151.         $count_log2 = min($this->iteration_count_log2 + 8, 24);
  152.         # This should be odd to not reveal weak DES keys, and the
  153.         # maximum valid value is (2**24 - 1) which is odd anyway.
  154.         $count = (1 << $count_log2) - 1;
  155.  
  156.         $output = '_';
  157.         $output .= $this->itoa64[$count & 0x3f];
  158.         $output .= $this->itoa64[($count >> 6) & 0x3f];
  159.         $output .= $this->itoa64[($count >> 12) & 0x3f];
  160.         $output .= $this->itoa64[($count >> 18) & 0x3f];
  161.  
  162.         $output .= $this->encode64($input, 3);
  163.  
  164.         return $output;
  165.     }
  166.  
  167.     function gensalt_blowfish($input)
  168.     {
  169.         # This one needs to use a different order of characters and a
  170.         # different encoding scheme from the one in encode64() above.
  171.         # We care because the last character in our encoded string will
  172.         # only represent 2 bits.  While two known implementations of
  173.         # bcrypt will happily accept and correct a salt string which
  174.         # has the 4 unused bits set to non-zero, we do not want to take
  175.         # chances and we also do not want to waste an additional byte
  176.         # of entropy.
  177.         $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  178.  
  179.         $output = '$2a$';
  180.         $output .= chr(ord('0') + $this->iteration_count_log2 / 10);
  181.         $output .= chr(ord('0') + $this->iteration_count_log2 % 10);
  182.         $output .= '$';
  183.  
  184.         $i = 0;
  185.         do {
  186.             $c1 = ord($input[$i++]);
  187.             $output .= $itoa64[$c1 >> 2];
  188.             $c1 = ($c1 & 0x03) << 4;
  189.             if ($i >= 16) {
  190.                 $output .= $itoa64[$c1];
  191.                 break;
  192.             }
  193.  
  194.             $c2 = ord($input[$i++]);
  195.             $c1 |= $c2 >> 4;
  196.             $output .= $itoa64[$c1];
  197.             $c1 = ($c2 & 0x0f) << 2;
  198.  
  199.             $c2 = ord($input[$i++]);
  200.             $c1 |= $c2 >> 6;
  201.             $output .= $itoa64[$c1];
  202.             $output .= $itoa64[$c2 & 0x3f];
  203.         } while (1);
  204.  
  205.         return $output;
  206.     }
  207.  
  208.     function HashPassword($password)
  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 $hash;
  218.         }
  219.  
  220.         if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
  221.             if (strlen($random) < 3)
  222.                 $random = $this->get_random_bytes(3);
  223.             $hash =
  224.                 crypt($password, $this->gensalt_extended($random));
  225.             if (strlen($hash) == 20)
  226.                 return $hash;
  227.         }
  228.  
  229.         if (strlen($random) < 6)
  230.             $random = $this->get_random_bytes(6);
  231.         $hash =
  232.             $this->crypt_private($password,
  233.             $this->gensalt_private($random));
  234.         if (strlen($hash) == 34)
  235.             return $hash;
  236.  
  237.         # Returning '*' on error is safe here, but would _not_ be safe
  238.         # in a crypt(3)-like function used _both_ for generating new
  239.         # hashes and for validating passwords against existing hashes.
  240.         return '*';
  241.     }
  242.  
  243.     function CheckPassword($password, $stored_hash)
  244.     {
  245.         $hash = $this->crypt_private($password, $stored_hash);
  246.         if ($hash[0] == '*')
  247.             $hash = crypt($password, $stored_hash);
  248.  
  249.         return $hash == $stored_hash;
  250.     }
  251. }
  252.  
  253. ?>
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