in 2004-2006 and placed in * * 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. * * @author Solar Designer */ class PasswordHash { private $itoa64; private $iteration_count_log2; private $portable_hashes; private $random_state; /** * Constructor * * @param int $iteration_count_log2 * @param boolean $portable_hashes */ public function __construct($iteration_count_log2, $portable_hashes) { $this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31) { $iteration_count_log2 = 8; } $this->iteration_count_log2 = $iteration_count_log2; $this->portable_hashes = $portable_hashes; $this->random_state = microtime(); if (function_exists('getmypid')) { $this->random_state .= getmypid(); } } /** * @param int $count * @return String */ public function get_random_bytes($count) { $output = ''; if (is_callable('random_bytes')) { return random_bytes($count); } 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) { $this->random_state = md5(microtime() . $this->random_state); $output .= pack('H*', md5($this->random_state)); } $output = substr($output, 0, $count); } return $output; } /** * @param String $input * @param int $count * @return String */ public function encode64($input, $count) { $output = ''; $i = 0; do { $value = ord($input[$i++]); $output .= $this->itoa64[$value & 0x3f]; if ($i < $count) { $value |= ord($input[$i]) << 8; } $output .= $this->itoa64[($value >> 6) & 0x3f]; if ($i++ >= $count) { break; } if ($i < $count) { $value |= ord($input[$i]) << 16; } $output .= $this->itoa64[($value >> 12) & 0x3f]; if ($i++ >= $count) { break; } $output .= $this->itoa64[($value >> 18) & 0x3f]; } while ($i < $count); return $output; } /** * @param String $input * @return String */ public function gensalt_private($input) { $output = '$P$'; $output .= $this->itoa64[min($this->iteration_count_log2 + ((PHP_VERSION >= '5') ? 5 : 3), 30)]; $output .= $this->encode64($input, 6); return $output; } /** * @param String $password * @param String $setting * @return String */ public function crypt_private($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; } $count_log2 = strpos($this->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 .= $this->encode64($hash, 16); return $output; } /** * @param String $input * @return String */ public function gensalt_extended($input) { $count_log2 = min($this->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 .= $this->itoa64[$count & 0x3f]; $output .= $this->itoa64[($count >> 6) & 0x3f]; $output .= $this->itoa64[($count >> 12) & 0x3f]; $output .= $this->itoa64[($count >> 18) & 0x3f]; $output .= $this->encode64($input, 3); return $output; } /** * @param String $input * @return String */ public function gensalt_blowfish($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') + $this->iteration_count_log2 / 10); $output .= chr(ord('0') + $this->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; } /** * @param String $password */ public function HashPassword($password) { $random = ''; if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) { $random = $this->get_random_bytes(16); $hash = crypt($password, $this->gensalt_blowfish($random)); if (strlen($hash) == 60) { return $hash; } } if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) { if (strlen($random) < 3) { $random = $this->get_random_bytes(3); } $hash = crypt($password, $this->gensalt_extended($random)); if (strlen($hash) == 20) { return $hash; } } if (strlen($random) < 6) { $random = $this->get_random_bytes(6); } $hash = $this->crypt_private($password, $this->gensalt_private($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 '*'; } /** * @param String $password * @param String $stored_hash * @return boolean */ public function CheckPassword($password, $stored_hash) { $hash = $this->crypt_private($password, $stored_hash); if ($hash[0] == '*') { $hash = crypt($password, $stored_hash); } return hash_equals($stored_hash, $hash); } }