【日常筆記】字元串加密

====對稱加密(向量)=====

        //SymmetricAlgorithm 所有對稱演算法的實現都必須從中繼承的抽象基類
        private SymmetricAlgorithm mobjCryptoService;
        private string key;
        public Encrypt()
        {
            mobjCryptoService = new RijndaelManaged();
            key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";//自定義的密串
        }
        /// <summary>
        /// 獲得密鑰
        /// </summary>
        /// <returns>密鑰</returns>
        private byte[] GetLegalKey()
        {
            string sTemp = key;
            mobjCryptoService.GenerateKey();// 當在派生類中重寫時，生成用於該演算法的隨機密鑰
            byte[] bytTemp = mobjCryptoService.Key;
            int KeyLength = bytTemp.Length;
            if (sTemp.Length > KeyLength)
                sTemp = sTemp.Substring(0, KeyLength);
            else if (sTemp.Length < KeyLength)
                sTemp = sTemp.PadRight(KeyLength, ' ');
            return ASCIIEncoding.ASCII.GetBytes(sTemp);
        }
        /// <summary>
        /// 獲得初始向量IV
        /// </summary>
        /// <returns>初試向量IV</returns>
        private byte[] GetLegalIV()
        {
            string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";
            mobjCryptoService.GenerateIV();
            byte[] bytTemp = mobjCryptoService.IV;// 獲取或設置對稱演算法的初始化向量
            int IVLength = bytTemp.Length;//獲得一個 32 位整數，表示 System.Array 的所有維數中元素的總數
            if (sTemp.Length > IVLength)
                sTemp = sTemp.Substring(0, IVLength);
            else if (sTemp.Length < IVLength)
                sTemp = sTemp.PadRight(IVLength, ' ');
            return ASCIIEncoding.ASCII.GetBytes(sTemp);
        }
        /// <summary>
        /// 加密方法(請先實例化Encrypt類)
        /// </summary>
        /// <param name="Source">待加密的串</param>
        /// <returns>經過加密的串</returns>
        public string EncrypStrByIV(string Source)
        {
            byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
            MemoryStream ms = new MemoryStream();
            mobjCryptoService.Key = GetLegalKey();
            mobjCryptoService.IV = GetLegalIV();
            ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
            cs.Write(bytIn, 0, bytIn.Length);
            cs.FlushFinalBlock();
            ms.Close();
            byte[] bytOut = ms.ToArray();
            return Convert.ToBase64String(bytOut);
        }
        /// <summary>
        /// 解密方法(請先實例化Encrypt類)
        /// </summary>
        /// <param name="Source">待解密的串</param>
        /// <returns>經過解密的串</returns>
        public string DecrypStrByIV(string Source)
        {
            byte[] bytIn = Convert.FromBase64String(Source);
            MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
            mobjCryptoService.Key = GetLegalKey();
            mobjCryptoService.IV = GetLegalIV();
            ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cs);
            return sr.ReadToEnd();
        }
    

 ========DES加密========

        /// <summary>
        /// DES加密
        /// </summary>
        /// <param name="Text">待加密的字元串</param>
        /// <returns>加密後的字元串</returns>
        public static string DESEncrypt(string Text)
        {
            return DESEncrypt(Text, "ijnskijnse");
        }

        /// <summary> 
        /// DES加密數據 
        /// </summary> 
        /// <param name="Text">待加密的字元串</param> 
        /// <param name="sKey">加密密鑰</param> 
        /// <returns>加密後的字元串</returns> 
        public static string DESEncrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(Text);
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            return ret.ToString();
        }




        /// <summary>
        /// DES解密
        /// </summary>
        /// <param name="Text">待解密的字元串</param>
        /// <returns>解密後的明文</returns>
        public static string DESDecrypt(string Text)
        {
            return DESDecrypt(Text, "ijnskijnse");
        }

        /// <summary> 
        /// DES解密數據 
        /// </summary> 
        /// <param name="Text">待解密的字元串</param> 
        /// <param name="sKey">解密密鑰</param> 
        /// <returns>解密後的明文</returns> 
        public static string DESDecrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Encoding.Default.GetString(ms.ToArray());
        }

 ====倒序加1加密解密====

 /// <summary>
        /// 倒序加1加密
        /// </summary>
        /// <param name="rs"></param>
        /// <returns></returns>
        public static string EncryptOrderStr(string rs) //倒序加1加密 
        {
            byte[] by = new byte[rs.Length];
            for (int i = 0; i <= rs.Length - 1; i++)
            {
                by[i] = (byte)((byte)rs[i] + 1);
            }
            rs = "";
            for (int i = by.Length - 1; i >= 0; i--)
            {
                rs += ((char)by[i]).ToString();
            }
            return rs;
        }
        /// <summary>
        /// 順序減1解碼 
        /// </summary>
        /// <param name="rs"></param>
        /// <returns></returns>
        public static string DecryptOrderStr(string rs) //順序減1解碼 
        {
            byte[] by = new byte[rs.Length];
            for (int i = 0; i <= rs.Length - 1; i++)
            {
                by[i] = (byte)((byte)rs[i] - 1);
            }
            rs = "";
            for (int i = by.Length - 1; i >= 0; i--)
            {
                rs += ((char)by[i]).ToString();
            }
            return rs;
        }

======Base64編解碼=====

        /// <summary>
        /// Base64編碼
        /// </summary>
        /// <param name="code_type">編碼類型</param>
        /// <param name="code">待編碼的字元串</param>
        /// <returns></returns>
        public static string Base64Encode(string code_type, string code)
        {
            string encode = "";
            byte[] bytes = Encoding.GetEncoding(code_type).GetBytes(code);
            try
            {
                encode = Convert.ToBase64String(bytes);
            }
            catch
            {
                encode = code;
            }
            return encode;
        }
        /// <summary>
        /// Base64解碼
        /// </summary>
        /// <param name="code_type">編碼類型</param>
        /// <param name="code">帶解碼的字元串</param>
        /// <returns></returns>
        public static string Base64Decode(string code_type, string code)
        {
            string decode = "";
            byte[] bytes = Convert.FromBase64String(code);
            try
            {
                decode = Encoding.GetEncoding(code_type).GetString(bytes);
            }
            catch
            {
                decode = code;
            }
            return decode;
        }