c# MD5加密解密代碼

// 在此處添加更多操作並使用 [OperationContract] 標記它們
        #region MD5加密
        /// <summary>   
        /// MD5加密   
        /// </summary>   
        /// <param name="strSource">需要加密的字符串</param>   
        /// <returns>MD5加密后的字符串</returns>   
        [OperationContract]
        public string Md5Encrypt(string strSource)
        {
            //把字符串放到byte數組中   
            byte[] bytIn = System.Text.Encoding.Default.GetBytes(strSource);
            //建立加密對象的密鑰和偏移量           
            byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定義偏移量   
            byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定義密鑰   
            //實例DES加密類   
            DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
            mobjCryptoService.Key = iv;
            mobjCryptoService.IV = key;
            ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
            //實例MemoryStream流加密密文件   
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
            cs.Write(bytIn, 0, bytIn.Length);
            cs.FlushFinalBlock();

            string strOut = System.Convert.ToBase64String(ms.ToArray());
            return strOut;
        }
        #endregion

        #region MD5解密
        /// <summary>   
        /// MD5解密   
        /// </summary>   
        /// <param name="Source">需要解密的字符串</param>   
        /// <returns>MD5解密后的字符串</returns>   
        [OperationContract]
        public string Md5Decrypt(string Source)
        {
            //將解密字符串轉換成字節數組   
            byte[] bytIn = System.Convert.FromBase64String(Source);
            //給出解密的密鑰和偏移量，密鑰和偏移量必須與加密時的密鑰和偏移量相同   
            byte[] iv = { 102, 16, 93, 156, 78, 4, 218, 32 };//定義偏移量   
            byte[] key = { 55, 103, 246, 79, 36, 99, 167, 3 };//定義密鑰   
            DESCryptoServiceProvider mobjCryptoService = new DESCryptoServiceProvider();
            mobjCryptoService.Key = iv;
            mobjCryptoService.IV = key;
            //實例流進行解密   
            System.IO.MemoryStream ms = new System.IO.MemoryStream(bytIn, 0, bytIn.Length);
            ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
            StreamReader strd = new StreamReader(cs, Encoding.Default);
            return strd.ReadToEnd();
        }
        #endregion  
    }