C# md5加密方法

  public static string md5(string str, int code)
        {
            if (code == 16) //16位MD5加密（取32位加密的9~25字符）  
            {
                return FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8, 16);
            }
            if (code == 32) //32位加密 
            {
                return FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();
            }
            return "00000000000000000000000000000000";
        }

        public static string md5(string str)
        {
            return FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower();
        }