112 lines
3.4 KiB
PHP
112 lines
3.4 KiB
PHP
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<?php
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/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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# ***** BEGIN LICENSE BLOCK *****
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# This file is part of Plume Framework, a simple PHP Application Framework.
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# Copyright (C) 2001-2007 Loic d'Anterroches and contributors.
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#
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# Plume Framework is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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#
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# Plume Framework is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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# ***** END LICENSE BLOCK ***** */
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/**
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* Simple encryption class.
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*
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* Very simple encryption class to perform simple encryption. It can
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* be used for example when you request a valid email address to
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* register. The validation link can contain the encrypted email.
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*
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* DO NOT EVER USE IT FOR REALLY IMPORTANT DATA!!!
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*
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* Credit Anonymous on http://www.php.net/mcrypt
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*/
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class Pluf_Crypt
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{
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public $key = '';
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/**
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* Construct the encryption object.
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*
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* @param string The encryption key ('')
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*/
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function __construct($key='')
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{
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$this->key = $key;
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}
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/**
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* Encrypt a string with a key.
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*
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* If the key is not given, $this->key is used. If $this->key is
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* empty an exception is raised.
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*
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* @param string String to encode
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* @param string Encryption key ('')
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* @return string Encoded string
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*/
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function encrypt($string, $key='')
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{
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if ($key == '') {
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$key = $this->key;
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}
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if ($key == '') {
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throw new Exception('No encryption key provided.');
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}
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$result = '';
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$strlen = strlen($string);
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$keylen = strlen($key);
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for($i=0; $i<$strlen; $i++) {
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$char = substr($string, $i, 1);
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$keychar = substr($key, ($i % $keylen)-1, 1);
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$char = chr(ord($char)+ord($keychar));
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$result.=$char;
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}
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$result = base64_encode($result);
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return str_replace(array('+','/','='), array('-','_','~'), $result);
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}
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/**
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* Decrypt a string with a key.
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*
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* If the key is not given, $this->key is used. If $this->key is
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* empty an exception is raised.
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*
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* @param string String to decode
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* @param string Encryption key ('')
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* @return string Decoded string
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*/
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function decrypt($string, $key='')
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{
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if ($key == '') {
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$key = $this->key;
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}
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if ($key == '') {
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throw new Exception('No encryption key provided.');
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}
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$result = '';
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$string = str_replace(array('-','_','~'), array('+','/','='), $string);
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$string = base64_decode($string);
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$strlen = strlen($string);
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$keylen = strlen($key);
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for($i=0; $i<$strlen; $i++) {
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$char = substr($string, $i, 1);
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$keychar = substr($key, ($i % $keylen)-1, 1);
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$char = chr(ord($char)-ord($keychar));
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$result.=$char;
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}
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return $result;
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}
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}
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