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+<?php
+/*
+ * File: ratatoeskr/sys/pwhash.php
+ *
+ * Hashing passwords
+ *
+ * License:
+ * This file is part of Ratatöskr.
+ * Ratatöskr is licensed unter the MIT / X11 License.
+ * See "ratatoeskr/licenses/ratatoeskr" for more information.
+ */
+
+/*
+ * Class: PasswordHash
+ * Contains static functions for password hashes.
+ * Is just used as a namespace, can not be created.
+ *
+ * It should be fairly difficult to break these salted hashes via bruteforce attacks.
+ */
+class PasswordHash
+{
+ private function __construct() {} /* Prevent construction */
+
+ private static $saltlen_min = 20;
+ private static $saltlen_max = 30;
+ private static $iterations_min = 200;
+ private static $iterations_max = 1000;
+
+ private static function hash($data, $salt, $iterations)
+ {
+ $hash = $data . $salt;
+ for($i = $iterations ;$i--;)
+ $hash = sha1($data . $hash . $salt, (bool) $i);
+ return $iterations . '$' . bin2hex($salt) . '$' . $hash;
+ }
+
+ /*
+ * Function: create
+ * Create a password hash string.
+ *
+ * Parameters:
+ * $password - The password (or other data) to hash.
+ *
+ * Returns:
+ * The salted hash as a string.
+ */
+ public static function create($password)
+ {
+ $salt = "";
+ $saltlen = mt_rand(self::$saltlen_min, self::$saltlen_max);
+ for($i = 0; $i < $saltlen; $i++)
+ $salt .= chr(mt_rand(0,255));
+ return self::hash($password, $salt, mt_rand(self::$iterations_min, self::$iterations_max));
+ }
+
+ /*
+ * Function: validate
+ * Validate a salted hash.
+ *
+ * Parameters:
+ * $password - The password to test.
+ * $pwhash - The hash to test against.
+ *
+ * Returns:
+ * True, if $password was correct, False otherwise.
+ */
+ public static function validate($password, $pwhash)
+ {
+ list($iterations, $hexsalt, $hash) = explode('$', $pwhash);
+ return self::hash($password, pack("H*", $hexsalt), $iterations) == $pwhash;
+ }
+}
+
+?>