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<?php
/**
* The Horde_Cipher:: class provides a common abstracted interface to
* various Ciphers for encryption of arbitrary length pieces of data.
*
* Copyright 2002-2006 Mike Cochrane <mike@graftonhall.co.nz>
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* $Horde: framework/Cipher/Cipher.php,v 1.16.12.8 2006/01/01 21:28:10 jan Exp $
*
* @author Mike Cochrane <mike@graftonhall.co.nz>
* @since Horde 2.2
* @package Horde_Cipher
*/
class Horde_Cipher {
/**
* The block mode for the cipher chaining
*
* @var string
*/
var $_blockMode = 'CBC';
/**
* The initialization vector
*
* @var string
*/
var $_iv = null;
/**
* Set the block mode for cipher chaining.
*
* @param string $blockMode The new blockmode.
*/
function setBlockMode($blockMode)
{
$this->_blockMode = $blockMode;
}
/**
* Set the IV.
*
* @param string $iv The new IV.
*/
function setIV($iv)
{
$this->_iv = $iv;
}
/**
* Encrypt a string.
*
* @param string $plaintext The data to encrypt.
*
* @return string The encrypted data.
*/
function encrypt($plaintext)
{
require_once dirname(__FILE__) . '/Cipher/BlockMode.php';
$blockMode = &Horde_Cipher_BlockMode::factory($this->_blockMode);
if (!is_null($this->_iv)) {
$blockMode->setIV($this->_iv);
}
return $blockMode->encrypt($this, $plaintext);
}
/**
* Decrypt a string.
*
* @param string $ciphertext The data to decrypt.
*
* @return string The decrypted data.
*/
function decrypt($ciphertext)
{
require_once dirname(__FILE__) . '/Cipher/BlockMode.php';
$blockMode = &Horde_Cipher_BlockMode::factory($this->_blockMode);
if (!is_null($this->_iv)) {
$blockMode->setIV($this->_iv);
}
return $blockMode->decrypt($this, $ciphertext);
}
/**
* Attempts to return a concrete Horde_Cipher instance.
*
* @param string $cipher The type of concrete Horde_Cipher subclass to
* return.
* @param array $params A hash containing any additional parameters a
* subclass might need.
*
* @return Horde_Cipher The newly created concrete Horde_Cipher instance,
* or PEAR_Error on error.
*/
function &factory($cipher, $params = null)
{
$driver = basename($cipher);
if (@file_exists(dirname(__FILE__) . '/Cipher/' . $cipher . '.php')) {
require_once dirname(__FILE__) . '/Cipher/' . $cipher . '.php';
}
$class = 'Horde_Cipher_' . $cipher;
if (class_exists($class)) {
$cipher = &new $class($params);
} else {
$cipher = PEAR::raiseError('Class definition of ' . $class . ' not found.');
}
return $cipher;
}
}
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