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<?php
/**
* Copyright 2012-2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file LICENSE for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package Crypt_Blowfish
*/
/**
* Abstract base driver class for blowfish encryption.
*
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @copyright 2012-2017 Horde LLC
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package Crypt_Blowfish
*/
abstract class Horde_Crypt_Blowfish_Base
{
/**
* Cipher method.
*
* @var string
*/
public $cipher;
/**
* Initialization vector.
*
* @var string
*/
public $iv = null;
/**
* Encryption key.
*
* @var string
*/
public $key;
/**
* Is this driver supported on this system?
*
* @return boolean True if supported.
*/
public static function supported()
{
return true;
}
/**
* Constructor.
*
* @param string $cipher Either 'ecb' or 'cbc'.
*/
public function __construct($cipher)
{
$this->cipher = $cipher;
}
/**
* Encrypts a string.
*
* @param string $text The string to encrypt.
*
* @return string The ciphertext.
* @throws Horde_Crypt_Blowfish_Exception
*/
abstract public function encrypt($text);
/**
* Decrypts a string.
*
* @param string $text The string to encrypt.
*
* @return string The ciphertext.
* @throws Horde_Crypt_Blowfish_Exception
*/
abstract public function decrypt($text);
/**
* Sets the initialization vector (required for CBC mode).
*
* @param string $iv Initialization vector.
*/
public function setIv($iv = null)
{
$this->iv = is_null($iv)
? substr(new Horde_Support_Randomid(), 0, 8)
: $iv;
}
/**
* Pad text to match blocksize length.
*
* @param string $text Unpadded text.
* @param boolean $ignore Don't pad if already at blocksize length.
*
* @return string Padded text.
*/
protected function _pad($text, $ignore = false)
{
$blocksize = Horde_Crypt_Blowfish::BLOCKSIZE;
$padding = $blocksize - (strlen($text) % $blocksize);
return ($ignore && ($padding == $blocksize))
? $text
: $text . str_repeat(chr($padding), $padding);
}
/**
* Unpad text from blocksize boundary.
*
* @param string $text Padded text.
*
* @return string Unpadded text.
*/
protected function _unpad($text)
{
return substr($text, 0, ord(substr($text, -1)) * -1);
}
}