SaltedHash.php

<?php 

class SaltedHash {
	protected $salt;
	protected $active_hash;
	
	const SALT_LENGTH = 15;
	
	function __construct($hash=null) {
		$this->active_hash = $hash;
		if ($hash) $this->salt = substr($salt, 0, self::SALT_LENGTH);
		else $this->salt = str_pad('', self::SALT_LENGTH, sha1(uniqid(rand(), true)));
	}
	
	function hash($password) {
		return $this->salt . sha1("{$this->salt}{$password}");
	}
	
	function compare($password) {
		if (!$this->hash) return false;
		return $this->hash($password) === $this->active_hash;
	}
	
}