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