PHP實現(xiàn)的DES加密解密實例代碼

    本文實例講述了PHP實現(xiàn)的DES加密解密實例。分享給大家供大家參考，具體如下：
    <?php
    $key = 'very important data';
    function jiami($key, $str)
    {
      /* Open module, and create IV */
      $td = mcrypt_module_open('des', '', 'ecb', '');
      //$td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, '');
      //$td = mcrypt_module_open('des', '', 'cbc', '');
      $key = substr($key, 0, mcrypt_enc_get_key_size($td));
      $iv_size = mcrypt_enc_get_iv_size($td);
      $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
      /* Initialize encryption handle */
      if (mcrypt_generic_init($td, $key, $iv) === -1)
      {
        return FALSE;
      }
      /* Encrypt data */
      $c_t = mcrypt_generic($td, $str);
      /* Clean up */
      mcrypt_generic_deinit($td);
      mcrypt_module_close($td);
      return $c_t;
    }
    function jiemi($key, $str)
    {
      /* Open module, and create IV */
      $td = mcrypt_module_open('des', '', 'ecb', '');
      //$td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, '');
      //$td = mcrypt_module_open('des', '', 'cbc', '');
      $key = substr($key, 0, mcrypt_enc_get_key_size($td));
      $iv_size = mcrypt_enc_get_iv_size($td);
      $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
      /* Initialize encryption handle */
      if (mcrypt_generic_init($td, $key, $iv) === -1)
      {
        return FALSE;
      }
      /* Reinitialize buffers for decryption */
      $p_t = mdecrypt_generic($td, $str);
      /* Clean up */
      mcrypt_generic_deinit($td);
      mcrypt_module_close($td);
      return trim($p_t);
    }
    $str = 'hello world!';
    echo 'key:' . $key . '<br>';
    echo 'str:' . $str . '<br>';
    $jiami = jiami($key, $str);
    echo '加密:' . $jiami . '<br>';
    file_put_contents('jiamiqian.txt', $str);
    file_put_contents('jiamihou.txt', $jiami);
    $jiemi = jiemi($key, $jiami);
    echo '解密:' . $jiemi . '<br>';
    希望本文所述對大家PHP程序設(shè)計有所幫助。