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   1  <?php
   2  
   3  /**
   4   * Base Class for all stream ciphers
   5   *
   6   * PHP version 5
   7   *
   8   * @category  Crypt
   9   * @package   StreamCipher
  10   * @author    Jim Wigginton <[email protected]>
  11   * @author    Hans-Juergen Petrich <[email protected]>
  12   * @copyright 2007 Jim Wigginton
  13   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  14   * @link      http://phpseclib.sourceforge.net
  15   */
  16  
  17  namespace phpseclib3\Crypt\Common;
  18  
  19  /**
  20   * Base Class for all stream cipher classes
  21   *
  22   * @package StreamCipher
  23   * @author  Jim Wigginton <[email protected]>
  24   */
  25  abstract class StreamCipher extends SymmetricKey
  26  {
  27      /**
  28       * Block Length of the cipher
  29       *
  30       * Stream ciphers do not have a block size
  31       *
  32       * @see \phpseclib3\Crypt\Common\SymmetricKey::block_size
  33       * @var int
  34       * @access private
  35       */
  36      protected $block_size = 0;
  37  
  38      /**
  39       * Default Constructor.
  40       *
  41       * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct()
  42       * @return \phpseclib3\Crypt\Common\StreamCipher
  43       */
  44      public function __construct()
  45      {
  46          parent::__construct('stream');
  47      }
  48  
  49      /**
  50       * Stream ciphers not use an IV
  51       *
  52       * @access public
  53       * @return bool
  54       */
  55      public function usesIV()
  56      {
  57          return false;
  58      }
  59  }