MARKUS

using System;

using System.Collections.Generic;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Threading.Tasks;

namespace ConnectionStrEncrypt

{

    class Program

    {

        static void Main(string[] args)

        {

            ///String originalText = "data source=cloud.devdoftech.co.kr,7777;database={0};user id=doftech;password=dof1073#";

            String key = "Doftech1073#";

            if ((args.Length == 2) && (args[0] == "-en"))

            {

                String en = Encrypt(args[1], key);

                Console.WriteLine("Encrypted Text is \"" + en + "\"");

            }

            else if ((args.Length == 2) && (args[0] == "-de"))

            {

                String de = Decrypt(args[1], key);

                Console.WriteLine("Decrypted Text is \"" + de + "\"");

            }

            else

            {

                Console.WriteLine("Usage : ConnectionStrEncrypt.exe -en|-de <input string>");

            }

        }

        public static string Decrypt(string textToDecrypt, string key)

        {

            RijndaelManaged rijndaelCipher = new RijndaelManaged();

            rijndaelCipher.Mode = CipherMode.CBC;

            rijndaelCipher.Padding = PaddingMode.PKCS7;

            rijndaelCipher.KeySize = 128;

            rijndaelCipher.BlockSize = 128;

            byte[] encryptedData = Convert.FromBase64String(textToDecrypt);

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

            byte[] keyBytes = new byte[16];

            int len = pwdBytes.Length;

            if (len > keyBytes.Length)

            {

                len = keyBytes.Length;

            }

            Array.Copy(pwdBytes, keyBytes, len);

            rijndaelCipher.Key = keyBytes;

            rijndaelCipher.IV = keyBytes;

            byte[] plainText = rijndaelCipher.CreateDecryptor().TransformFinalBlock(encryptedData, 0, encryptedData.Length);

            return Encoding.UTF8.GetString(plainText);

        }

        public static string Encrypt(string textToEncrypt, string key)

        {

            RijndaelManaged rijndaelCipher = new RijndaelManaged();

            rijndaelCipher.Mode = CipherMode.CBC;

            rijndaelCipher.Padding = PaddingMode.PKCS7;

            rijndaelCipher.KeySize = 128;

            rijndaelCipher.BlockSize = 128;

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

            byte[] keyBytes = new byte[16];

            int len = pwdBytes.Length;

            if (len > keyBytes.Length)

            {

                len = keyBytes.Length;

            }

            Array.Copy(pwdBytes, keyBytes, len);

            rijndaelCipher.Key = keyBytes;

            rijndaelCipher.IV = keyBytes;

            ICryptoTransform transform = rijndaelCipher.CreateEncryptor();

            byte[] plainText = Encoding.UTF8.GetBytes(textToEncrypt);

            return Convert.ToBase64String(transform.TransformFinalBlock(plainText, 0, plainText.Length));

        }

    }

}