[Summary view] [Print] [Text view]

   1  <?php
   2  
   3  /**
   4   * Base Class for all stream ciphers
   5   *
   6   * PHP version 5
   7   *
   8   * @author    Jim Wigginton <terrafrost@php.net>
   9   * @author    Hans-Juergen Petrich <petrich@tronic-media.com>
  10   * @copyright 2007 Jim Wigginton
  11   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  12   * @link      http://phpseclib.sourceforge.net
  13   */
  14  
  15  namespace phpseclib3\Crypt\Common;
  16  
  17  /**
  18   * Base Class for all stream cipher classes
  19   *
  20   * @author  Jim Wigginton <terrafrost@php.net>
  21   */
  22  abstract class StreamCipher extends SymmetricKey
  23  {
  24      /**
  25       * Block Length of the cipher
  26       *
  27       * Stream ciphers do not have a block size
  28       *
  29       * @see \phpseclib3\Crypt\Common\SymmetricKey::block_size
  30       * @var int
  31       */
  32      protected $block_size = 0;
  33  
  34      /**
  35       * Default Constructor.
  36       *
  37       * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
  38       * @return \phpseclib3\Crypt\Common\StreamCipher
  39       */
  40      public function __construct()
  41      {
  42          parent::__construct('stream');
  43      }
  44  
  45      /**
  46       * Stream ciphers not use an IV
  47       *
  48       * @return bool
  49       */
  50      public function usesIV()
  51      {
  52          return false;
  53      }
  54  }