using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        var key = "BootBarn2020!BootBarn2020!";

        var input = "12345678954322341999:4321:07:2021";

        var encrypted = Encrypt(input, key);

        var decrypted = Decrypt(encrypted, key);

        var token = decrypted.Split(':')[0];

        var lastFour = decrypted.Split(':')[1];

        var expMonth = decrypted.Split(':')[2];

        var expYear = decrypted.Split(':')[3];

        Console.WriteLine("Encrypted: " + encrypted);

        Console.WriteLine("Decrypted: " + decrypted);

        Console.WriteLine("token: " + token);

        Console.WriteLine("last 4: " + lastFour);

        Console.WriteLine("expMonth: " + expMonth);

        Console.WriteLine("expYear: " + expYear);

    }

​

    public static string Encrypt(string input, string key)

    {

        if (!string.IsNullOrWhiteSpace(input))

        {

            try

            {

                TripleDESCryptoServiceProvider objDESCrypto = new TripleDESCryptoServiceProvider();

                MD5CryptoServiceProvider objHashMD5 = new MD5CryptoServiceProvider();

                byte[] byteHash, byteBuff;

                byteHash = objHashMD5.ComputeHash(Encoding.ASCII.GetBytes(key));

                objHashMD5 = null;

                objDESCrypto.Key = byteHash;

                objDESCrypto.Mode = CipherMode.ECB;

                byteBuff = Encoding.ASCII.GetBytes(input);

                string encrypted = Convert.ToBase64String(objDESCrypto.CreateEncryptor().TransformFinalBlock(byteBuff, 0, byteBuff.Length));

                return encrypted;

            }

            catch (Exception ex)

            {

                return "Wrong Input. " + ex.Message;

            }

        }

​

        return string.Empty;

    }

​

    public static string Decrypt(string encrypted, string key)

    {

        if (!string.IsNullOrWhiteSpace(encrypted))

        {

            try

            {

                TripleDESCryptoServiceProvider objDESCrypto = new TripleDESCryptoServiceProvider();

                MD5CryptoServiceProvider objHashMD5 = new MD5CryptoServiceProvider();

                byte[] byteHash, byteBuff;

                byteHash = objHashMD5.ComputeHash(Encoding.ASCII.GetBytes(key));

                objHashMD5 = null;

                objDESCrypto.Key = byteHash;

                objDESCrypto.Mode = CipherMode.ECB;

                byteBuff = Convert.FromBase64String(encrypted);

                string decrypted = Encoding.ASCII.GetString(objDESCrypto.CreateDecryptor().TransformFinalBlock(byteBuff, 0, byteBuff.Length));

                objDESCrypto = null;

                return decrypted;

            }

            catch (Exception ex)

            {

                return "Wrong Input. " + ex.Message;

            }

        }

​

        return string.Empty;

    }

}