using System;

using System.IO;

using System.Web;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

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

        Console.WriteLine("final string: " + Program.encodeUrl("http://127.0.0.1:8000/"));

    }

    public static string encodeUrl(string url)

    {

        //Code for creating the Self-registration URL along with language and return URL. 

        //If localization is enabled, get the selected language. If no language, set it to text en. 

        //Encrypts the return URL by calling the Encrypt() method.(This method is provided below under Encryption Logic). 

        string retURLEncryptedVal = HttpUtility.UrlEncode(Encrypt(url, "5j04OtO4gKm+/Ynez+wW/BjUvdhn1SfuGJbrQmsTViU=")); 

        //string retURLEncryptedVal = HttpUtility.UrlEncode(url); 

        return retURLEncryptedVal;

    }

    //Code for encrypting the return URL. 

    public static string Encrypt(string clearText, string encryptionKey) 

    { 

        byte[] clearBytes = Encoding.Unicode.GetBytes(clearText); 

        using (Aes encryptor = Aes.Create()) 

        { 

            Console.WriteLine("plain url: " + clearText);

            Console.WriteLine("key: " + encryptionKey);

            //Creating the Salt Key. 

            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(encryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 }); 

            encryptor.Key = pdb.GetBytes(32); 

            encryptor.IV = pdb.GetBytes(16);

            using (MemoryStream ms = new MemoryStream()) 

            { 

                using (CryptoStream cs = new CryptoStream(ms,encryptor.CreateEncryptor(), CryptoStreamMode.Write)) 

                { 

                    cs.Write(clearBytes, 0, clearBytes.Length); 

                    cs.Close(); 

                }

                foreach(byte b in ms.ToArray()) {

                    //Console.WriteLine(b.ToString());

                }

                clearText = Convert.ToBase64String(ms.ToArray()); 

            } 

        } 

        Console.WriteLine("encrypted, pre urlencode: " + clearText);

        return clearText; 

    }

}