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<?php
/**
* Base Class for all stream ciphers
*
* PHP version 5
*
* @category Crypt
* @package StreamCipher
* @author Jim Wigginton <terrafrost@php.net>
* @author Hans-Juergen Petrich <petrich@tronic-media.com>
* @copyright 2007 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
namespace phpseclib3\Crypt\Common;
/**
* Base Class for all stream cipher classes
*
* @package StreamCipher
* @author Jim Wigginton <terrafrost@php.net>
*/
abstract class StreamCipher extends SymmetricKey
{
/**
* Block Length of the cipher
*
* Stream ciphers do not have a block size
*
* @see \phpseclib3\Crypt\Common\SymmetricKey::block_size
* @var int
* @access private
*/
protected $block_size = 0;
/**
* Default Constructor.
*
* @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
* @return \phpseclib3\Crypt\Common\StreamCipher
*/
public function __construct()
{
parent::__construct('stream');
}
/**
* Stream ciphers not use an IV
*
* @access public
* @return bool
*/
public function usesIV()
{
return false;
}
}