using System;

using System.Text;

using System.Security.Cryptography;

using Newtonsoft.Json;

public class Program

{

    public void Main()

    {

        var apal_data = new {

            EXCHANGE_ITEM = "Invoice",

            EXCHANGE_OBJECT = ""

        };

        string reg_code = "aPFdDmLafv9Vv0b4myGkBbsfMUxsVmyHv3bmSQNg6VI=";

        string iv_code = "2YgZy2kNE5VWzL3vzjF+rw==";

        string apal_json = JsonConvert.SerializeObject(apal_data);

        string idiot_need = Encryption(reg_code, iv_code, apal_json);

        Console.WriteLine(idiot_need);

        string back_data = "VigUnbJhWekj3CDh+fFAnWA4BzAbbZQ/K010OUFwqVTul/r9VEKPqch44dqA5zTPw0mHkisIPu/QW+lgZabLxMtcq5psOK0A673wVIhfwaRrfXpl+BEc4Bq9y0Z4BdvkFJ/jb9NQsOG/q0ghQwoHi++kJZ2bxobzgbCysuHBorxeDcqkGyGrOhmExrcBgDAkmqJvxCt89Hk32QoR9nVyC4l1iaEK+LJ8lOl2GDRMET7eE2F31v+S04j7CYtidT8b";

        string code_analyze = Decrypt(reg_code, iv_code, back_data);

        Console.WriteLine(code_analyze);

        string AES_KEY = "V/CBOWybgnEqlkZ7TaMP/luvpN83QeGUO390yAmfJDY=";

        string IV_KEY = "Gm5ne9Tajv5n+3DjGfygCg==";

        string AES_KEY_64decode = Encoding.UTF8.GetString(Convert.FromBase64String(AES_KEY));

        string IV_KEY_64decode = Encoding.UTF8.GetString(Convert.FromBase64String(IV_KEY));

        Console.WriteLine(AES_KEY_64decode);

        Console.WriteLine(IV_KEY_64decode);

        StringBuilder AES_HEX = new StringBuilder();

        foreach(char c in AES_KEY_64decode){

            AES_HEX.AppendFormat("{0:X2}", (int)c);

        }

        StringBuilder IV_HEX = new StringBuilder();

        foreach(char c in IV_KEY_64decode){

            IV_HEX.AppendFormat("{0:X2}", (int)c);

        }

        Console.WriteLine(AES_HEX.ToString());

        Console.WriteLine(IV_HEX.ToString());

    }

    public string Encryption(string reg, string iv, string js)

    {

        string s = "";

        byte[] x = null;

​

        string adskey = Encoding.UTF8.GetString(Convert.FromBase64String(reg));

        string ivkey = Encoding.UTF8.GetString(Convert.FromBase64String(iv));

​

        using (AesCryptoServiceProvider AesCSP = new AesCryptoServiceProvider())

        {

            string ak64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(adskey), 0, 32);

            string ik64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(ivkey), 0, 16);

            AesCSP.Key = Convert.FromBase64String(ak64);

            AesCSP.IV = Convert.FromBase64String(ik64);

​

            byte[] vs = UnicodeEncoding.Unicode.GetBytes(js);

            ICryptoTransform xfrm = AesCSP.CreateEncryptor();

            x = xfrm.TransformFinalBlock(vs, 0, vs.Length);

        }

        s = Convert.ToBase64String(x);

​

        string datastr = JsonConvert.SerializeObject(s);

        return datastr;

    }

    public string Decrypt(string reg, string iv, string cont)

    {

        byte[] x = null;

        string s = "";

        string adskey = Encoding.UTF8.GetString(Convert.FromBase64String(reg));

        string ivkey = Encoding.UTF8.GetString(Convert.FromBase64String(iv));

        using (AesCryptoServiceProvider AesCSP = new AesCryptoServiceProvider())

        {

            string ak64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(adskey), 0, 32);

            string ik64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(ivkey), 0, 16);

            AesCSP.Key = Convert.FromBase64String(ak64);

            AesCSP.IV = Convert.FromBase64String(ik64);

​

            byte[] vs = Convert.FromBase64String(cont);

            StringBuilder vs_HEX = new StringBuilder();

            foreach(char c in vs){

                vs_HEX.AppendFormat("{0:X2}", (int)c);

            }

            Console.WriteLine("============");

            Console.WriteLine(vs_HEX.ToString());

            Console.WriteLine("============");

            ICryptoTransform xfrm = AesCSP.CreateDecryptor();

            x = xfrm.TransformFinalBlock(vs, 0, vs.Length);

        }

        s = UnicodeEncoding.Unicode.GetString(x);

        return s;

    }

}