part_OnTimePadVers.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using System.IO;
using System.IO.Compression;
using System.Threading.Tasks;
using System.Windows.Threading;
using System.Security.Cryptography;


namespace OnTimePad_WPF
{
    public partial class MainWindow : Window
    {
        private void On_Time_Pad_Vers()
        {
            FileStream ein = null;
            FileStream aus = null;
            FileStream ausSchluessel = null;
            Random Rn = new Random();
            string TempFile = "";

            try
            {
                #region TextBox_PfadWaehlen.Text
                FileInfo FI1 = this.fi1;
                FileInfo FI2 = new FileInfo(str_TextBox_SpeicherOrt);

                //Endung darf nicht: "K_V_Pad_"  haben!
                if (FI1.Name.IndexOf("K_V_Pad_") != -1)
                {
                    AbbruchFlag = true;
                    MessageBox.Show("Falsche Datei! :(");
                    return;
                }

                TempFile = FI2.FullName + "\\_" + Convert.ToString(Rn.Next(100000000, 999999999)) + FI1.Extension;

                string File_K_V_Pad = FI2.FullName + "\\" + "K_V_Pad_" + FI1.Name;
                string File_Schl_Pad = FI2.FullName + "\\" + "Schl_Pad_" + FI1.Name; ;
                #endregion




                #region %%%%%%%%%%%%%%%%%%%%% Komprimieren %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
                this.Dispatcher.Invoke(new MeinDele(Meldungen), DispatcherPriority.Normal, "Komprimieren :/");

                ein = new FileStream(FI1.FullName, FileMode.Open);
                aus = new FileStream(TempFile, FileMode.Create);


                byte[] byArr = new byte[ein.Length];
                ein.Read(byArr, 0, byArr.Length);

                //Zwischenschritt sonst alles gleich(einmal durch den DeflateStream Konstruktor lassen! :/ )
                DeflateStream ausDef = new DeflateStream(aus, System.IO.Compression.CompressionLevel.Optimal);
                ausDef.Write(byArr, 0, byArr.Length);

                ausDef.Close();
                ein.Close();
                aus.Close();
                #endregion %%%%%%%%%%%%%%%%%%%%% Ende Komprimieren %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%




                #region %%%%%%%%%%%%%%%%%%%%% Verschlüsseln mit Pad %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
                this.Dispatcher.Invoke(new MeinDele(Meldungen), DispatcherPriority.Normal, "Schlüssel Erzeugen :/");

                ein = null;
                aus = null;


                //************************Neuer Teil RNGCryptoServiceProvider*****************************************
                //Grösse des Byte Array festlegen mit Erzeugung.
                byte[] schlusselArray = new byte[new FileInfo(TempFile).Length];
                RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
                //Byte Array Abfüllen
                rng.GetBytes(schlusselArray);
                //Resourcen wieder Freigeben
                rng.Dispose();
                //***************************************************************************************************


                ein = new FileStream(TempFile, FileMode.Open);
                aus = new FileStream(File_K_V_Pad, FileMode.Create);
                ausSchluessel = new FileStream(File_Schl_Pad, FileMode.Create);

                //Schlüssel gleich Rausschreiben ins File
                ausSchluessel.Write(schlusselArray, 0, schlusselArray.Length);

                this.Dispatcher.Invoke(new MeinDele(Meldungen), DispatcherPriority.Normal, "Verschlüsseln :/");

                //Länge für for
                long lan = (long)ein.Length;

                byte by;
                for (long x = 0; x < lan; ++x)
                {
                    //Einzelne Bytes
                    by = (byte)ein.ReadByte();// Jedes Byte der Komprimierten Datei Einlesen.

                    ////////Hier wird das Byte verändert/////////
                    by = (byte)((int)by ^ (int)schlusselArray[x]);
                    /////////////////////////////////////////////

                    aus.WriteByte(by);
                }
                this.Dispatcher.Invoke(new MeinDele(Meldungen), DispatcherPriority.Normal, "Fertig! :)");
                #endregion %%%%%%%%%%%%%%%%%%%%% Ende Verschlüsseln Password %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

            }
            catch (Exception e)
            {
                AbbruchFlag = true;

                this.Dispatcher.Invoke(new MeinDele(Meldungen), DispatcherPriority.Normal, "");

                MessageBox.Show(e.Message);
            }
            finally// Wird immer Ausgeführt mit oder ohne Exception 
            {
                if (ein != null)
                    ein.Close();
                if (aus != null)
                    aus.Close();
                if (ausSchluessel != null)
                    ausSchluessel.Close();

                // Ojb Erzeugen um zu löschen! :/
                if (TempFile != "")
                    new FileInfo(TempFile).Delete();
            }
        }
    }
}