C# DES加密解密

 #region  DES加密
        private static byte[] key = ASCIIEncoding.ASCII.GetBytes(GetMacAddress());
        private static byte[] iv = ASCIIEncoding.ASCII.GetBytes("99008855");

        //判斷當前運行環境
        public bool IsDebug()
        {
            Assembly assembly = Assembly.GetAssembly(GetType());
            bool debug = false;
            foreach (var attribute in assembly.GetCustomAttributes(false))
            {
                if (attribute.GetType() == typeof(System.Diagnostics.DebuggableAttribute))
                {
                    if (((System.Diagnostics.DebuggableAttribute)attribute)
                        .IsJITTrackingEnabled)
                    {
                        debug = true;
                        break;
                    }
                }
            }
            return debug;
        }


        /// <summary>  
        /// 獲取本機MAC地址  
        /// </summary>  
        /// <returns>本機MAC地址</returns>  
        public static string GetMacAddress()
        {
            try
            {
                string strMac = string.Empty;
                ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
                ManagementObjectCollection moc = mc.GetInstances();
                foreach (ManagementObject mo in moc)
                {
                    if ((bool)mo["IPEnabled"] == true)
                    {
                        strMac = mo["MacAddress"].ToString();
                    }
                }
                moc = null;
                mc = null;
                return strMac;
            }
            catch
            {
                return "unknown";
            }
        }
        /// <summary>
        /// DES加密。
        /// </summary>
        /// <param name="inputString">輸入字符串。</param>
        /// <returns>加密後的字符串。</returns>
        public static string DESEncrypt(string inputString)
        {
            MemoryStream ms = null;
            CryptoStream cs = null;
            StreamWriter sw = null;

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            try
            {
                ms = new MemoryStream();
                cs = new CryptoStream(ms, des.CreateEncryptor(key, iv), CryptoStreamMode.Write);
                sw = new StreamWriter(cs);
                sw.Write(inputString);
                sw.Flush();
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
            }
            finally
            {
                if (sw != null) sw.Close();
                if (cs != null) cs.Close();
                if (ms != null) ms.Close();
            }
        }

        /// <summary>
        /// DES解密。
        /// </summary>
        /// <param name="inputString">輸入字符串。</param>
        /// <returns>解密後的字符串。</returns>
        public static string DESDecrypt(string inputString)
        {
            MemoryStream ms = null;
            CryptoStream cs = null;
            StreamReader sr = null;

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            try
            {
                ms = new MemoryStream(Convert.FromBase64String(inputString));
                cs = new CryptoStream(ms, des.CreateDecryptor(key, iv), CryptoStreamMode.Read);
                sr = new StreamReader(cs);
                return sr.ReadToEnd();
            }
            finally
            {
                if (sr != null) sr.Close();
                if (cs != null) cs.Close();
                if (ms != null) ms.Close();
            }
        }
        #endregion