74 lines
2.1 KiB
PHP
74 lines
2.1 KiB
PHP
<?php
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/**
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* Copyright 2005-2008 Matthew Fonda <mfonda@php.net>
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* Copyright 2008 Philippe Jausions <jausions@php.net>
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* Copyright 2012-2017 Horde LLC (http://www.horde.org/)
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*
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* See the enclosed file COPYING for license information (LGPL). If you
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* did not receive this file, see http://www.horde.org/licenses/lgpl21.
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*
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* @author Matthew Fonda <mfonda@php.net>
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* @author Philippe Jausions <jausions@php.net>
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* @author Michael Slusarz <slusarz@horde.org>
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* @category Horde
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* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
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* @package Crypt_Blowfish
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*/
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/**
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* PHP implementation of the Blowfish algorithm in CBC mode.
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*
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* @author Matthew Fonda <mfonda@php.net>
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* @author Philippe Jausions <jausions@php.net>
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* @author Michael Slusarz <slusarz@horde.org>
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* @category Horde
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* @copyright 2005-2008 Matthew Fonda
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* @copyright 2008 Philippe Jausions
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* @copyright 2012-2017 Horde LLC
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* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
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* @package Crypt_Blowfish
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*/
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class Horde_Crypt_Blowfish_Php_Cbc extends Horde_Crypt_Blowfish_Php_Base
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{
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/**
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*/
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public function encrypt($text, $iv)
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{
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$cipherText = '';
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$len = strlen($text);
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list(, $Xl, $Xr) = unpack('N2', substr($text, 0, 8) ^ $iv);
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$this->_encipher($Xl, $Xr);
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$cipherText .= pack('N2', $Xl, $Xr);
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for ($i = 8; $i < $len; $i += 8) {
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list(, $Xl, $Xr) = unpack('N2', substr($text, $i, 8) ^ substr($cipherText, $i - 8, 8));
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$this->_encipher($Xl, $Xr);
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$cipherText .= pack('N2', $Xl, $Xr);
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}
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return $cipherText;
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}
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/**
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*/
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public function decrypt($text, $iv)
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{
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$plainText = '';
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$len = strlen($text);
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list(, $Xl, $Xr) = unpack('N2', substr($text, 0, 8));
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$this->_decipher($Xl, $Xr);
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$plainText .= (pack('N2', $Xl, $Xr) ^ $iv);
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for ($i = 8; $i < $len; $i += 8) {
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list(, $Xl, $Xr) = unpack('N2', substr($text, $i, 8));
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$this->_decipher($Xl, $Xr);
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$plainText .= (pack('N2', $Xl, $Xr) ^ substr($text, $i - 8, 8));
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}
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return $plainText;
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}
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}
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