using System;
using System.Text;
using System.Collections.Generic;
using System.Security.Cryptography;

class demo{
    public static void Main(string[] args){
        byte[] str = {100};
        byte[] key = {144,241,254,108,140,100,228,61,157,121,152,136,197,198,154,104};
        byte[] IV = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
        String crypt = AesEncrypt(str,key,IV) ;
    }
    private static string AesEncrypt(byte[] str, byte[] key, byte[] IVString)
        {
            Encoding encoder = Encoding.UTF8;
            byte[] toEncryptArray = str;
            RijndaelManaged rm = new RijndaelManaged
            {
                Key = key,
                Mode = CipherMode.CBC,
                Padding = PaddingMode.PKCS7,
                IV = IVString,
            };
            ICryptoTransform cTransform = rm.CreateEncryptor();
            List<byte> temp = new List<byte>();
            byte[] hexstart = IVString;
            byte[] hexend = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            temp.AddRange(hexstart);
            temp.AddRange(hexend);
            var inject_payload = new byte[temp.Count];
            temp.CopyTo(inject_payload);
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return Convert.ToBase64String(inject_payload);
        }
}