using System;

using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(encypt_Aes("testName", "1234")); // 9ujwat4vUpXUZbIXzBW1jQ==

    }

    public static string encypt_Aes(string username, string password) 

    {

        string encrypted = string.Empty;

        byte[] clearBytes = Encoding.UTF8.GetBytes(password);

        using (Aes aesAlg = Aes.Create())

        {

            byte[] k; byte[] iv;

            byte[] bytes = Encoding.UTF8.GetBytes(username);

            k = SHA256.Create().ComputeHash(bytes);

            iv = MD5.Create().ComputeHash(bytes);

            aesAlg.Key = k;

            aesAlg.IV = iv;

            ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

            using (MemoryStream msEncrypt = new MemoryStream())

            {

                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))

                {

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

                }

                encrypted = Convert.ToBase64String(msEncrypt.ToArray()); // Fix

            }

        }

        return encrypted;

    }

}