using System;

using System.Security.Cryptography; 

using System.Text;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(EncryptExt("Hello World"));

        Console.WriteLine(DecryptExt(EncryptExt("Hello World")));

    }

    public static string EncryptExt(string raw)

​

        {

​

            using (var csp = new AesCryptoServiceProvider())

​

            {

​

                ICryptoTransform e = GetCryptoTransformExt(csp, true);

​

                byte[] inputBuffer = Encoding.UTF8.GetBytes(raw);

​

                byte[] output = e.TransformFinalBlock(inputBuffer, 0, inputBuffer.Length);

​

​

                string encrypted = Convert.ToBase64String(output);

​

​

                return encrypted;

​

            }

​

        }

​

​

        public static string DecryptExt(string encrypted)

​

        {

​

            using (var csp = new AesCryptoServiceProvider())

​

            {

​

                var d = GetCryptoTransformExt(csp, false);

​

                byte[] output = Convert.FromBase64String(encrypted);

​

                byte[] decryptedOutput = d.TransformFinalBlock(output, 0, output.Length);

​

​

                string decypted = Encoding.UTF8.GetString(decryptedOutput);

​

                return decypted;

​

            }

​

        }

​

​

        private static ICryptoTransform GetCryptoTransformExt(AesCryptoServiceProvider csp, bool encrypting)

​

        {

​

            csp.Mode = CipherMode.CBC;

​

           csp.Padding = PaddingMode.PKCS7;

​

            var passWord = Convert.ToString("AvbSkj3BVbf4o6mdlAofDp0/SD0susEWo0pKdmqas");

​

            var salt = Convert.ToString("ABj4PQgf3j5gblQ0iDp0/Gb07ukQWo0a");

​

​

            String iv = Convert.ToString("aAB1jhPQ89o=f619");

​

​

            var spec = new Rfc2898DeriveBytes(Encoding.UTF8.GetBytes(passWord), Encoding.UTF8.GetBytes(salt), 65536);

​

            byte[] key = spec.GetBytes(16);

​

​

​

            csp.IV = Encoding.UTF8.GetBytes(iv);

​

            csp.Key = key;

​

            if (encrypting)

​

            {

​

                return csp.CreateEncryptor();

​

            }

​

            return csp.CreateDecryptor();

​

        }

}