using System;

using System.Security.Cryptography;

using System.Text;

using System.IO;

public class Program

{

    public static void Main()

    {

        try

        {

            string Key = "Busa2017";            

            string TextoPlano = "7816F5CA0FDBEF52E9BB65586A7A83D5";

            byte[] encrypted;

            using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())

            {

                var _key = UTF8Encoding.UTF8.GetBytes(Key);

                _key = SHA256.Create().ComputeHash(_key);

                aesAlg.Mode = CipherMode.ECB;

                aesAlg.Padding = PaddingMode.PKCS7;

                aesAlg.Key = _key;

                ICryptoTransform encryptor = aesAlg.CreateEncryptor();

                using (MemoryStream msEncrypt = new MemoryStream())

                {

                    using (CryptoStream csEncrypt =

                           new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))

                    {

                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))

                        {

                            swEncrypt.Write(TextoPlano);

                        }

                        encrypted = msEncrypt.ToArray();

                    }

                }

            }

            string TextoCifrado = Convert.ToBase64String(encrypted);

            Console.WriteLine(TextoCifrado);

        }

        catch (Exception ex){

            Console.WriteLine(ex);

        }

    }

}