evil.cs

using System;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;

namespace competition2
{
    public class Form1 : Form
    {
        private IContainer components;

        private Button decryptButton;

        private Label label1;

        private TextBox textBox2;

        private Label label2;

        public Form1()
        {
            this.InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string str = this.textBox2.Text.Trim();
            if (str.Length < 3)
            {
                MessageBox.Show("Erst Code eingeben!");
                return;
            }
            if (!this.callCthulhu(str))
            {
                MessageBox.Show("Ohne gültigen Code geht hier nix weiter.");
                return;
            }
            OpenFileDialog openFileDialog = new OpenFileDialog()
            {
                Filter = "Crypted files (*.crypt)|*.crypt"
            };
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    byte[] numArray = File.ReadAllBytes(openFileDialog.FileName);
                    byte[] numArray1 = this.invertGravity(numArray);
                    File.WriteAllBytes(openFileDialog.FileName.Substring(0, openFileDialog.FileName.Length - 6), numArray1);
                    MessageBox.Show("Okay, ist entschlüsselt.");
                }
                catch (Exception exception1)
                {
                    Exception exception = exception1;
                    MessageBox.Show(string.Concat("Fehler! Und Du bist schuld: ", exception.Message));
                }
            }
        }

        private bool callCthulhu(string serial)
        {
            bool flag;
            try
            {
                TcpClient tcpClient = new TcpClient("127.0.0.1", 1337);
                byte[] bytes = Encoding.ASCII.GetBytes(serial);
                NetworkStream stream = tcpClient.GetStream();
                stream.Write(bytes, 0, (int)bytes.Length);
                byte[] numArray = new byte[1024];
                string empty = string.Empty;
                int num = stream.Read(numArray, 0, (int)numArray.Length);
                empty = Encoding.ASCII.GetString(numArray, 0, num);
                stream.Close();
                tcpClient.Close();
                flag = empty.Trim().Equals(this.installLinux());
            }
            catch (Exception exception1)
            {
                Exception exception = exception1;
                MessageBox.Show(string.Concat("Kann mich nicht zu meinem Server verbinden.\nFehlermeldung: ", exception.Message));
                flag = false;
            }
            return flag;
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing && this.components != null)
            {
                this.components.Dispose();
            }
            base.Dispose(disposing);
        }

        private void InitializeComponent()
        {
            this.decryptButton = new Button();
            this.label1 = new Label();
            this.textBox2 = new TextBox();
            this.label2 = new Label();
            base.SuspendLayout();
            this.decryptButton.Location = new Point(16, 153);
            this.decryptButton.Name = "decryptButton";
            this.decryptButton.Size = new Size(126, 23);
            this.decryptButton.TabIndex = 3;
            this.decryptButton.Text = "&Datei entschlüsseln";
            this.decryptButton.UseVisualStyleBackColor = true;
            this.decryptButton.Click += new EventHandler(this.button1_Click);
            this.label1.AutoSize = true;
            this.label1.Font = new Font("Tahoma", 14f);
            this.label1.Location = new Point(12, 9);
            this.label1.Name = "label1";
            this.label1.Size = new Size(392, 69);
            this.label1.TabIndex = 1;
            this.label1.Text = "Wir haben Deine Dateien verschlüsselt! \r\nGib hier einen Code zum Entsperren ein. \r\n(Gibts für nur 1 BTC auf unserer Homepage!)";
            this.textBox2.Location = new Point(54, 109);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new Size(171, 20);
            this.textBox2.TabIndex = 2;
            this.label2.AutoSize = true;
            this.label2.Location = new Point(12, 112);
            this.label2.Name = "label2";
            this.label2.Size = new Size(36, 13);
            this.label2.TabIndex = 1;
            this.label2.Text = "&Code:";
            base.AutoScaleDimensions = new SizeF(6f, 13f);
            base.AutoScaleMode = AutoScaleMode.Font;
            base.ClientSize = new Size(485, 195);
            base.Controls.Add(this.label2);
            base.Controls.Add(this.textBox2);
            base.Controls.Add(this.label1);
            base.Controls.Add(this.decryptButton);
            base.Name = "Form1";
            this.Text = "Wegelagerer 1.0";
            base.ResumeLayout(false);
            base.PerformLayout();
        }

        private string installLinux()
        {
            string str = "The iron bank will have its due";
            string[] strArrays = new string[] { str.Substring(0, 1).Replace('q', 'm').Replace('T', 'A').Replace('e', 'd').Replace('v', 's').Replace('r', 'L').Replace('i', 'a'), str.Substring(3, 1), str.Substring(13, 1).Replace('i', 'k').Replace('A', 'k').Replace('n', 'q').Replace(' ', 'L').Replace('y', 'd').Replace('v', 'f').Replace('m', 'a').Replace('m', 'e'), str.Substring(10, 1), str.Substring(7, 1), str.Substring(7, 1), str.Substring(4, 1), str.Substring(26, 1), str.Substring(25, 1), str.Substring(2, 1), str.Substring(5, 1), str.Substring(3, 1), str.Substring(10, 1), str.Substring(16, 1), str.Substring(14, 1), str.Substring(10, 1), str.Substring(5, 1).Replace('c', 'l').Replace('m', 'v').Replace('d', 'o').Replace('k', 'd').Replace('r', 'y').Replace('u', 'A').Replace('g', 'm'), str.Substring(26, 1), str.Substring(3, 1), str.Substring(13, 1).Replace('u', 's').Replace('q', 'A').Replace('k', 'a').Replace('f', 'g').Replace(' ', 'p').Replace('A', 'o').Replace('A', 'r').Replace('m', 'b'), str.Substring(10, 1), str.Substring(4, 1).Replace('g', 'k').Replace('h', 'p').Replace('i', 'y').Replace('f', 'x').Replace('t', 'g').Replace('j', ' ').Replace(' ', 'b'), str.Substring(26, 1), str.Substring(3, 1), str.Substring(1, 1), str.Substring(4, 1), str.Substring(26, 1), str.Substring(3, 1), str.Substring(28, 1), str.Substring(2, 1), str.Substring(9, 1), str.Substring(25, 1), str.Substring(26, 1) };
            return string.Concat(strArrays);
        }

        private byte[] invertGravity(byte[] chi)
        {
            if ((int)chi.Length % 2 != 0)
            {
                throw new Exception("Verschlüsselte Datei hat falsche Länge oder so.");
            }
            byte[] numArray = new byte[(int)chi.Length / 2];
            for (int i = 0; i < (int)numArray.Length; i++)
            {
                numArray[i] = Math.Min(chi[i * 2], chi[i * 2 + 1]);
            }
            return numArray;
        }
    }
}