.net实现discuz的双重加密

/// <summary>
  /// 用于Discuz中的用户加密数据
  /// </summary>
  /// <returns></returns>
  public string get_Pwd()
  {
  sixNum = returnSixNumber();
  string md5str = FormsAuthentication.HashPasswordForStoringInConfigFile(this.Register_Password.Value.Trim(), "MD5");
  md5str = md5str + sixNum;
  string md = FormsAuthentication.HashPasswordForStoringInConfigFile(md5str.ToLower(), "MD5");
  return md.ToLower();
  }

  /// <summary>
  /// 返回六位数的随机数
  /// </summary>
  /// <returns></returns>
  public string returnSixNumber()
  {
  string number = "abcdefghijklmnopqrstuvwxyz0123456789";
  string chooseNum = "";
  for (int i = 0; i < 6; i++)
  {
  Random rd = new Random(unchecked((int)DateTime.Now.Ticks));
  chooseNum+=number.Substring(rd.Next(1, 38),1);
  }
  return chooseNum;
  }