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-rw-r--r--pwhash.php74
1 files changed, 0 insertions, 74 deletions
diff --git a/pwhash.php b/pwhash.php
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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;
- }
-}
-
-?>