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Hash.php
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<?php # # Portable PHP password hashing framework. # # Version 0.3 / genuine. # # Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in # the public domain. Revised in subsequent years, still public domain. # # There's absolutely no warranty. # # The homepage URL for this framework is: # # http://www.openwall.com/phpass/ # # Please be sure to update the Version line if you edit this file in any way. # It is suggested that you leave the main version number intact, but indicate # your project name (after the slash) and add your own revision information. # # Please do not change the "private" password hashing method implemented in # here, thereby making your hashes incompatible. However, if you must, please # change the hash type identifier (the "$P$") to something different. # # Obviously, since this code is in the public domain, the above are not # requirements (there can be none), but merely suggestions. # /** * phpass class converted to CodeIgniter library * * * @package CodeIgniter * @subpackage Extended Libraries * @category Extended Libraries * @author Arnas Lukosevicius (aka steelaz), original author - Solar Designer * @link http://www.arnas.net/blog/2010/06/password-hashing-class-phpass-converted-to-codeigniter-library/ * * you must have the following structure setup in order to use this class * * */ class Hash { static $itoa64; static $iteration_count_log2; static $portable_hashes; static $random_state; public function __construct($config = array()) { if (isset($config['iterations'])) $iteration_count_log2 = $config['iterations']; else $iteration_count_log2 = 8; if (isset($config['portable'])) $portable_hashes = $config['portable']; else $portable_hashes = FALSE; self::$itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31) $iteration_count_log2 = 8; self::$iteration_count_log2 = $iteration_count_log2; self::$portable_hashes = $portable_hashes; self::$random_state = microtime(); if (function_exists('getmypid')) self::$random_state .= getmypid(); } private static function get_random_bytes($count) { $output = ''; if (is_readable('/dev/urandom') && ($fh = @fopen('/dev/urandom', 'rb'))) { $output = fread($fh, $count); fclose($fh); } if (strlen($output) < $count) { $output = ''; for ($i = 0; $i < $count; $i += 16) { self::$random_state = md5(microtime() . self::$random_state); $output .= pack('H*', md5(self::$random_state)); } $output = substr($output, 0, $count); } return $output; } private static function encode64($input, $count) { $output = ''; $i = 0; do { $value = ord($input[$i++]); $output .= self::$itoa64[$value & 0x3f]; if ($i < $count) $value |= ord($input[$i]) << 8; $output .= self::$itoa64[($value >> 6) & 0x3f]; if ($i++ >= $count) break; if ($i < $count) $value |= ord($input[$i]) << 16; $output .= self::$itoa64[($value >> 12) & 0x3f]; if ($i++ >= $count) break; $output .= self::$itoa64[($value >> 18) & 0x3f]; } while ($i < $count); return $output; } private static function gensalt_private($input) { $output = '$P$'; $output .= self::$itoa64[min(self::$iteration_count_log2 + ((PHP_VERSION >= '5') ? 5 : 3), 30)]; $output .= self::encode64($input, 6); return $output; } private static function crypt_private($password, $setting) { $output = '*0'; if (substr($setting, 0, 2) == $output) $output = '*1'; $id = substr($setting, 0, 3); # We use "$P$", phpBB3 uses "$H$" for the same thing if ($id != '$P$' && $id != '$H$') return $output; $count_log2 = strpos(self::$itoa64, $setting[3]); if ($count_log2 < 7 || $count_log2 > 30) return $output; $count = 1 << $count_log2; $salt = substr($setting, 4, 8); if (strlen($salt) != 8) return $output; # We're kind of forced to use MD5 here since it's the only # cryptographic primitive available in all versions of PHP # currently in use. To implement our own low-level crypto # in PHP would result in much worse performance and # consequently in lower iteration counts and hashes that are # quicker to crack (by non-PHP code). if (PHP_VERSION >= '5') { $hash = md5($salt . $password, TRUE); do { $hash = md5($hash . $password, TRUE); } while (--$count); } else { $hash = pack('H*', md5($salt . $password)); do { $hash = pack('H*', md5($hash . $password)); } while (--$count); } $output = substr($setting, 0, 12); $output .= self::encode64($hash, 16); return $output; } private static function gensalt_extended($input) { $count_log2 = min(self::$iteration_count_log2 + 8, 24); # This should be odd to not reveal weak DES keys, and the # maximum valid value is (2**24 - 1) which is odd anyway. $count = (1 << $count_log2) - 1; $output = '_'; $output .= self::$itoa64[$count & 0x3f]; $output .= self::$itoa64[($count >> 6) & 0x3f]; $output .= self::$itoa64[($count >> 12) & 0x3f]; $output .= self::$itoa64[($count >> 18) & 0x3f]; $output .= self::encode64($input, 3); return $output; } private static function gensalt_blowfish($input) { # This one needs to use a different order of characters and a # different encoding scheme from the one in encode64() above. # We care because the last character in our encoded string will # only represent 2 bits. While two known implementations of # bcrypt will happily accept and correct a salt string which # has the 4 unused bits set to non-zero, we do not want to take # chances and we also do not want to waste an additional byte # of entropy. $itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; $output = '$2a$'; $output .= chr(ord('0') + self::$iteration_count_log2 / 10); $output .= chr(ord('0') + self::$iteration_count_log2 % 10); $output .= '$'; $i = 0; do { $c1 = ord($input[$i++]); $output .= $itoa64[$c1 >> 2]; $c1 = ($c1 & 0x03) << 4; if ($i >= 16) { $output .= $itoa64[$c1]; break; } $c2 = ord($input[$i++]); $c1 |= $c2 >> 4; $output .= $itoa64[$c1]; $c1 = ($c2 & 0x0f) << 2; $c2 = ord($input[$i++]); $c1 |= $c2 >> 6; $output .= $itoa64[$c1]; $output .= $itoa64[$c2 & 0x3f]; } while (1); return $output; } public static function HashPassword($password) { $random = ''; if (CRYPT_BLOWFISH == 1 && !self::$portable_hashes) { $random = self::get_random_bytes(16); $hash = crypt($password, self::gensalt_blowfish($random)); if (strlen($hash) == 60) return $hash; } if (CRYPT_EXT_DES == 1 && !self::$portable_hashes) { if (strlen($random) < 3) $random = self::get_random_bytes(3); $hash = crypt($password, self::gensalt_extended($random)); if (strlen($hash) == 20) return $hash; } if (strlen($random) < 6) $random = self::get_random_bytes(6); $hash = self::crypt_private($password, self::gensalt_private($random)); if (strlen($hash) == 34) return $hash; # Returning '*' on error is safe here, but would _not_ be safe # in a crypt(3)-like function used _both_ for generating new # hashes and for validating passwords against existing hashes. return '*'; } } /* End of file Hash.php */ /* Location: ./application/libraries/Hash.php */