First working version of the netcrypt sample.

README.md

@@ -1,5 +1,24 @@
 # netcrypt
-A proof-of-concept packer for .NET executables
+A proof-of-concept packer for .NET executables, designed to provide a starting point to explain the basic principles of runtime packing.
+
+# Implementation
+
+The packer is implemented in a shared library called netcrypt.dll. If you reference this library you can just use the following code to pack a file:
+
+	byte[] arrayOfUnpackedExeBytes;
+	// ... perform file loading/generation logic
+	byte[] packedExe = Packer.Pack(arrayOfUnpackedExeBytes);
+
+A sample GUI has been created in the SimplePacker project to demonstrate this principle.
+
+# Sample files
+
+In the /sample firectory you can find two files: input.exe and output.exe. The naming should indicate which one is packed and which one is not.
+
+# Warning
+
+This is a proof-of-concept code sample; it is possible that it will not work on your set up or does not work at all on your system.
+This packer is also considered to be highly insecure (as with all obfuscators/packers which provide security by obscurity), since an unpacker can be easily constructed. 
 
 # License
 Licensed under the GNU GPLv3 license.

netcrypt/SimplePacker/Form1.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Windows.Forms;
+using System.Diagnostics;
+using System.IO;
+using Netcrypt;
+
+namespace SimplePacker
+{
+    public partial class Form1 : Form
+    {
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        private void twitterLink_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
+        {
+            Process.Start("http://bit.ly/168dEqY");
+        }
+
+        private void sourceCodeLink_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
+        {
+            Process.Start("http://bit.ly/1gIe8pZ");
+        }
+
+        private void packExecButton_Click(object sender, EventArgs e)
+        {
+            if (inputFileLocationLabel.Text == "(choose)")
+            {
+                MessageBox.Show("Please choose an input file first.");
+                return;
+            }
+
+            if (outputFileLocationLabel.Text == "(choose)")
+            {
+                MessageBox.Show("Please choose an output file first.");
+                return;
+            }
+
+            try
+            {
+                File.WriteAllBytes(outputFileLocationLabel.Text, Packer.Pack(File.ReadAllBytes(inputFileLocationLabel.Text)));
+                MessageBox.Show("Packing completed succesfully.\n\nCross your fingers and try to execute the output file...");
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show("An error has occured while packing the executable.\nPlease note:\n* Only .NET executables will work\n* This is a proof-of-concept packer, designed as a learning aid for .NET developers. It might just not work on your executable.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+        }
+
+        private void chooseInputButton_Click(object sender, EventArgs e)
+        {
+            if (openFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
+            {
+                inputFileLocationLabel.Text = openFileDialog.FileName;
+            }
+        }
+
+        private void chooseOutputButton_Click(object sender, EventArgs e)
+        {
+            if (saveFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
+            {
+                outputFileLocationLabel.Text = saveFileDialog.FileName;
+            }
+        }
+    }
+}