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3DES 加解密，对长度不限制

發布時間：2024/8/24 编程问答 51 如意码农

生活随笔收集整理的這篇文章主要介紹了 3DES 加解密，对长度不限制小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

#region 3DES

        /// <summary>

        /// 3DES加密

        /// </summary>

        /// <param name="strString">需加密的字符串</param>

        /// <param name="strKey">密匙</param>

        /// <returns></returns>

        public static string DES3Encrypt(string strString, string strKey)

        {

            strString = strString + "".PadLeft();

            byte[] bMsg = Encoding.GetEncoding("GBK").GetBytes(strString);

            int l = (bMsg.Length /  + ) * ;

            byte[] btMsg = new byte[l];

            Array.Copy(bMsg, btMsg, bMsg.Length);

            byte[] digestOfPassword = Encoding.Default.GetBytes(strKey);

            byte[] keyBytes = new byte[];

            Array.Copy(digestOfPassword, keyBytes, digestOfPassword.Length);

            for (int j = , k = ; j < ; )

            {

                keyBytes[k++] = keyBytes[j++];

            }

            TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();

            DES.Mode = CipherMode.ECB;

            ICryptoTransform DESEncrypt = DES.CreateEncryptor(keyBytes, keyBytes);

            var dd = DESEncrypt.TransformFinalBlock(btMsg, , btMsg.Length);

            return byte2hex(dd).ToString().Substring(, (bMsg.Length /  + ) * );

        }

        public static String getAdd(int length, String strKey)

        {

            byte[] btMsg = new byte[length / ];

            byte[] digestOfPassword = Encoding.UTF8.GetBytes(strKey);

            //byte[] digestOfPassword = Encoding.Default.GetBytes(strKey);

            byte[] keyBytes = new byte[];

            Array.Copy(digestOfPassword, keyBytes, digestOfPassword.Length);

            for (int j = , k = ; j < ; )

            {

                keyBytes[k++] = keyBytes[j++];

            }

            TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();

            DES.Mode = CipherMode.ECB;

            ICryptoTransform DESEncrypt = DES.CreateEncryptor(keyBytes, keyBytes);

            var dd = DESEncrypt.TransformFinalBlock(btMsg, , btMsg.Length);

            String rtn = byte2hex(dd);

            return rtn.Substring(length);

        }

        /// <summary>

        /// 字節數組轉16進制字符串

        /// </summary>

        /// <param name="bytes"></param>

        /// <returns></returns>

        private static string byte2hex(byte[] dd)

        {

            StringBuilder ret = new StringBuilder();

            foreach (var item in dd)

            {

                ret.AppendFormat("{0:X2}", item);

            }

            return ret.ToString();

        }

        /// <summary>

        /// 字符串轉16進制字節數組

        /// </summary>

        /// <param name="hexString"></param>

        /// <returns></returns>

        private static byte[] strToToHexByte(string hexString)

        {

            hexString = hexString.Replace(" ", "");

            if ((hexString.Length % ) != )

                hexString += " ";

            byte[] returnBytes = new byte[hexString.Length / ];

            for (int i = ; i < returnBytes.Length; i++)

                returnBytes[i] = Convert.ToByte(hexString.Substring(i * , ), );

            return returnBytes;

        }

        /// <summary>

        /// 3DES解密

        /// </summary>

        /// <param name="strString">需解密的字符串</param>

        /// <param name="strKey">密匙</param>

        /// <returns></returns>

        public static string DES3Decrypt(string strString, string strKey)

        {

            strString += getAdd(strString.Length, strKey);

            byte[] digestOfPassword = Encoding.Default.GetBytes(strKey);

            byte[] keyBytes = new byte[];

            Array.Copy(digestOfPassword, keyBytes, digestOfPassword.Length);

            for (int j = , k = ; j < ; )

            {

                keyBytes[k++] = keyBytes[j++];

            }

            TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();

            DES.Mode = CipherMode.ECB;

            ICryptoTransform DESDecrypt = DES.CreateDecryptor(keyBytes, keyBytes);

            string result = "";

            try

            {

                byte[] Buffer = strToToHexByte(strString);

                byte[] bb = DESDecrypt.TransformFinalBlock(Buffer, , Buffer.Length);

                result = Encoding.GetEncoding("GBK").GetString(bb);

            }

            catch (Exception e)

            {

                throw e;

            }

            return result;

        }

        #endregion

2015-1-13 添加

在我傳遞key時，出現

查資料，原來是key的長度大于24了，（IV則是8位，但我沒有傳遞）

修改后的3DES算法

#region 3DES

        /// <summary>

        /// 3DES加密

        /// </summary>

        /// <param name="strString">需加密的字符串</param>

        /// <param name="strKey">密匙</param>

        /// <returns></returns>

        public static string DES3Encrypt(string strString, string strKey)

        {

            byte[] bMsg = Encoding.UTF8.GetBytes(strString);

            TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();

            DES.Mode = CipherMode.ECB;

            string key = strKey;

            while (key.Length < )

            {

                key += strKey;

            }

            byte[] digestOfPassword = Encoding.UTF8.GetBytes(key);

            byte[] keyBytes = new byte[];

            Array.Copy(digestOfPassword.Take().ToArray(), keyBytes, digestOfPassword.Take().ToArray().Length);

            DES.Key = keyBytes;

            ICryptoTransform DESEncrypt = DES.CreateEncryptor();

            var dd = DESEncrypt.TransformFinalBlock(bMsg, , bMsg.Length);

            return Convert.ToBase64String(dd);

        }

        /// <summary>

        /// 3DES解密

        /// </summary>

        /// <param name="strString">需解密的字符串</param>

        /// <param name="strKey">密匙</param>

        /// <returns></returns>

        public static string DES3Decrypt(string strString, string strKey)

        {

            TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();

            DES.Mode = CipherMode.ECB;

            string key = strKey;

            while (key.Length < )

            {

                key += strKey;

            }

            byte[] digestOfPassword = Encoding.UTF8.GetBytes(key);

            byte[] keyBytes = new byte[];

            Array.Copy(digestOfPassword.Take().ToArray(), keyBytes, digestOfPassword.Take().ToArray().Length);

            DES.Key = keyBytes;

            ICryptoTransform DESDecrypt = DES.CreateDecryptor();

            string result = "";

            try

            {

                byte[] Buffer = Convert.FromBase64String(strString);

                byte[] bb = DESDecrypt.TransformFinalBlock(Buffer, , Buffer.Length);

                result = Encoding.UTF8.GetString(bb);

            }

            catch (Exception e)

            {

                throw e;

            }

            return result;

        }

        #endregion

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编程问答

3DES 加解密，对长度不限制

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