aes

using System;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace Advanced
{
    class Program
    {
        static void Main(string[] args)
        {
            AesManaged sn=new AesManaged();
            Console.WriteLine(sn.LegalKeySizes);
            EncryptFile("ggwp.txt", "okwp.txt");
            Console.WriteLine("ggwp");
            DecryptFile("okwp.txt", "enctext.txt");

        }
        static void EncryptFile(string inputFile, string outputFile)
        {

            try
            {
                string password = "ggwpgiy2"; // Your Key Here
                UnicodeEncoding UE = new UnicodeEncoding();
                byte[] key = UE.GetBytes(password);
                string cryptFile = outputFile;
                FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);
                AesManaged RMCrypto = new AesManaged();
                AesCryptoServiceProvider asd = new AesCryptoServiceProvider();

                CryptoStream cs = new CryptoStream(fsCrypt,  RMCrypto.CreateEncryptor(key, key), CryptoStreamMode.Write);
                FileStream fsIn = new FileStream(inputFile, FileMode.Open);
                int data;
                while ((data = fsIn.ReadByte()) != -1)
                    cs.WriteByte((byte)data);
                fsIn.Close();
                cs.Close();
                fsCrypt.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }
        ///<summary>
        /// Steve Lydford - 12/05/2008.
        ///
        /// Decrypts a file using Rijndael algorithm.
        ///</summary>
        ///<param name="inputFile"></param>
        ///<param name="outputFile"></param>
        static void DecryptFile(string inputFile, string outputFile)
        {


            string password = "ggwpgiy2"; // Your Key Here

            UnicodeEncoding UE = new UnicodeEncoding();
            byte[] key = UE.GetBytes(password);

            FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);

            RijndaelManaged RMCrypto = new RijndaelManaged();
            AesCryptoServiceProvider
            CryptoStream cs = new CryptoStream(fsCrypt,
                RMCrypto.CreateDecryptor(key, key),
                CryptoStreamMode.Read);

            FileStream fsOut = new FileStream(outputFile, FileMode.Create);

            int data;
            while ((data = cs.ReadByte()) != -1)
                fsOut.WriteByte((byte)data);

            fsOut.Close();
            cs.Close();
            fsCrypt.Close();


        }
    }

}