<?php

// Copyright (c) 2010 by Paul M. Foster <hide@address.com>
// Licensed under PostgreSQL License (see LICENSE file)



class blowfish
{
	private $td, $iv, $live;
	private $key;

	function __construct($key)
	{
		$this->iv = 'unah3pat';
		$this->live = false;
		$this->td = mcrypt_module_open(MCRYPT_BLOWFISH, '', MCRYPT_MODE_CBC, '');
		if ($this->td !== false) {
			$this->key = md5($key);
			$this->live = true;
		}
	}

	function encrypt($cleartext)
	{
		if ($this->live) {
			mcrypt_generic_init($this->td, $this->key, $this->iv);
			return mcrypt_generic($this->td, $cleartext);
		}
		else
			return NULL;
	}

	function decrypt($encrypted_data)
	{
		if ($this->live) {
			mcrypt_generic_init($this->td, $this->key, $this->iv);
			return rtrim(mdecrypt_generic($this->td, $encrypted_data), "\0");
		}
		else
			return NULL;
	}

	function destruct()
	{
		if ($this->live) {
			unset($this->key);
			mcrypt_generic_deinit($this->td);
			mcrypt_module_close($this->td); 
		}
	}
};