private static void encryptFile(string inputFile, string outputFile, string password)
        {
            byte[] salt = GenerateRandomSalt();
            FileStream fsCrypt = new FileStream(outputFile, FileMode.Create);
            byte[] passwordBytes = System.Text.Encoding.UTF8.GetBytes(password);
            RijndaelManaged AES = new RijndaelManaged();
            AES.KeySize = 256;
            AES.BlockSize = 128;
            AES.Padding = PaddingMode.PKCS7;
            var key = new Rfc2898DeriveBytes(passwordBytes, salt, 50000);
            AES.Key = key.GetBytes(AES.KeySize / 8);
            AES.IV = key.GetBytes(AES.BlockSize / 8);
            AES.Mode = CipherMode.CFB;
            fsCrypt.Write(salt, 0, salt.Length);
            CryptoStream cs = new CryptoStream(fsCrypt, AES.CreateEncryptor(), CryptoStreamMode.Write);
            FileStream fsIn = new FileStream(inputFile, FileMode.Open);
            byte[] buffer = new byte[1048576];
            int read;
            int pastP = 0;
            while ((read = fsIn.Read(buffer, 0, buffer.Length)) > 0)
            {
                cs.Write(buffer, 0, read);
                var percentComplete = (float)fsIn.Position * 100 / fsIn.Length;
                int percentInt = Convert.ToInt32(percentComplete);
                if (pastP != percentInt)
                {
                    Console.WriteLine(percentInt);
                }
                pastP = percentInt;
            }
            fsIn.Close();
            cs.Close();
            fsCrypt.Close();
        }
        private static void decryptFile(string inputFile, string outputFile, string password)
        {
            byte[] passwordBytes = System.Text.Encoding.UTF8.GetBytes(password);
            byte[] salt = new byte[32];
            FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);
            fsCrypt.Read(salt, 0, salt.Length);
            RijndaelManaged AES = new RijndaelManaged();
            AES.KeySize = 256;
            AES.BlockSize = 128;
            var key = new Rfc2898DeriveBytes(passwordBytes, salt, 50000);
            AES.Key = key.GetBytes(AES.KeySize / 8);
            AES.IV = key.GetBytes(AES.BlockSize / 8);
            AES.Padding = PaddingMode.PKCS7;
            AES.Mode = CipherMode.CFB;
            CryptoStream cs = new CryptoStream(fsCrypt, AES.CreateDecryptor(), CryptoStreamMode.Read);
            FileStream fsOut = new FileStream(outputFile, FileMode.Create);
            int read;
            byte[] buffer = new byte[1048576];
            int pastP = 0;
            while ((read = cs.Read(buffer, 0, buffer.Length)) > 0)
            {
                fsOut.Write(buffer, 0, read);
                var percentComplete = (float)fsOut.Position * 100 / fsCrypt.Length;
                int percentInt = Convert.ToInt32(percentComplete);
                if (pastP != percentInt)
                {
                    Console.WriteLine(percentInt);
                }
                pastP = percentInt;
            }          
            fsOut.Close();
            fsCrypt.Close();
        }
        
        public static byte[] GenerateRandomSalt()
        {
            byte[] data = new byte[32];
            using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
            {
                for (int i = 0; i < 10; i++)
                {
                    rng.GetBytes(data);
                }
            }
            return data;
        }