（C# winform ）可执行文件加密

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.IO;
 using System.Security.Cryptography;
 using Microsoft.Win32;
 
 namespace EncryptExe
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }
 
         private void Form1_Load(object sender, EventArgs e)
         {
             FileMenu(Application.ExecutablePath + ",0", Application.ExecutablePath);
             string[] str = Environment.GetCommandLineArgs();
             try
             {
                 string strFile = "";
                 for (int i = 2; i < str.Length; i++)
                     strFile += str[i];
                 FileInfo FInfo = new FileInfo(strFile);
                 if (FInfo.Extension.ToLower() == ".mrexe")
                     textBox1.Text = strFile;
             }
             catch { }
         }
         
         //选择要加密或解密的文件
         private void button1_Click(object sender, EventArgs e)
         {
             openFileDialog1.Filter = "*.exe(exe可执行文件)|*.exe|*.mrexe(mrexe加密文件)|*.mrexe|*.*(所有文件)|*.*";
             if (openFileDialog1.ShowDialog() == DialogResult.OK)
                 textBox1.Text = openFileDialog1.FileName;
         }
 
         //加密EXE文件
         private void button2_Click(object sender, EventArgs e)
         {
             string strPwd = textBox2.Text;
             byte[] btRKey = new byte[0];
             if (strPwd.Length == 6)
             {
                 btRKey = new byte[] { (byte)strPwd[0], (byte)strPwd[1], (byte)strPwd[2], (byte)strPwd[3], (byte)strPwd[4], (byte)strPwd[5], (byte)strPwd[0], (byte)strPwd[1] };
             }
             if (strPwd.Length == 7)
             {
                 btRKey = new byte[] { (byte)strPwd[0], (byte)strPwd[1], (byte)strPwd[2], (byte)strPwd[3], (byte)strPwd[4], (byte)strPwd[5], (byte)strPwd[6], (byte)strPwd[0] };
             }
             if (strPwd.Length >= 8)
             {
                 btRKey = new byte[] { (byte)strPwd[0], (byte)strPwd[1], (byte)strPwd[2], (byte)strPwd[3], (byte)strPwd[4], (byte)strPwd[5], (byte)strPwd[6], (byte)strPwd[7] };
             }
             FileStream FStream = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
             FileStream NewFStream = new FileStream(textBox1.Text + ".mrexe", FileMode.OpenOrCreate, FileAccess.Write);
             NewFStream.SetLength((long)0);
             byte[] buffer = new byte[0x400];
             int MinNum = 0;
             long length = FStream.Length;
             int MaxNum = (int)(length / ((long)0x400));
             DES myDES = new DESCryptoServiceProvider();
             CryptoStream CStream = new CryptoStream(NewFStream, myDES.CreateEncryptor(btRKey, btRKey), CryptoStreamMode.Write);
             while (MinNum < length)
             {
                 int count = FStream.Read(buffer, 0, 0x400);
                 CStream.Write(buffer, 0, count);
                 MinNum += count;
             }
             CStream.Close();
             NewFStream.Close();
             FStream.Close();
             File.Delete(textBox1.Text);
             MessageBox.Show("使用口令加密可执行文件成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         }
 
         //解密EXE文件
         private void button3_Click(object sender, EventArgs e)
         {
             string strPwd = textBox2.Text;
             FileStream FStream = null;
             FileStream NewFStream = null;
             CryptoStream CStream = null;
             try
             {
                 try
                 {
                     byte[] btRKey = new byte[0];
                     if (strPwd.Length == 6)
                     {
                         btRKey = new byte[] { (byte)strPwd[0], (byte)strPwd[1], (byte)strPwd[2], (byte)strPwd[3], (byte)strPwd[4], (byte)strPwd[5], (byte)strPwd[0], (byte)strPwd[1] };
                     }
                     if (strPwd.Length == 7)
                     {
                         btRKey = new byte[] { (byte)strPwd[0], (byte)strPwd[1], (byte)strPwd[2], (byte)strPwd[3], (byte)strPwd[4], (byte)strPwd[5], (byte)strPwd[6], (byte)strPwd[0] };
                     }
                     if (strPwd.Length >= 8)
                     {
                         btRKey = new byte[] { (byte)strPwd[0], (byte)strPwd[1], (byte)strPwd[2], (byte)strPwd[3], (byte)strPwd[4], (byte)strPwd[5], (byte)strPwd[6], (byte)strPwd[7] };
                     }
                     FStream = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
                     string strNewFile = textBox1.Text.Substring(0, textBox1.Text.Length - 6);
                     NewFStream = new FileStream(strNewFile, FileMode.OpenOrCreate, FileAccess.Write);
                     NewFStream.SetLength((long)0);
                     byte[] buffer = new byte[0x400];
                     int MinNum = 0;
                     long length = FStream.Length;
                     int MaxNum = (int)(length / ((long)0x400));
                     DES myDES = new DESCryptoServiceProvider();
                     CStream = new CryptoStream(NewFStream, myDES.CreateDecryptor(btRKey, btRKey), CryptoStreamMode.Write);
                     while (MinNum < length)
                     {
                         int count = FStream.Read(buffer, 0, 0x400);
                         CStream.Write(buffer, 0, count);
                         MinNum += count;
                     }
                     CStream.Close();
                     FStream.Close();
                     NewFStream.Close();
                     File.Delete(textBox1.Text);
                     System.Diagnostics.Process.Start(strNewFile);
                 }
                 catch
                 {
                     MessageBox.Show("口令错误！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     textBox2.Focus();
                 }
             }
             finally
             {
                 CStream.Close();
                 FStream.Close();
                 NewFStream.Close();
             }
         }
 
         //创建快捷菜单
         public static void FileMenu(string strPath, string strName)
         {
             try
             {
                 Registry.ClassesRoot.CreateSubKey(".mrexe");
                 RegistryKey RKey1 = Registry.ClassesRoot.OpenSubKey(".mrexe", true);
                 RKey1.SetValue("", "mrexefile");
                 RKey1.Close();
                 Registry.ClassesRoot.CreateSubKey("mrexefile");
                 RegistryKey RKey2 = Registry.ClassesRoot.OpenSubKey("mrexefile", true);
                 RKey2.CreateSubKey("DefaultIcon");
                 RKey2.CreateSubKey("shell");
                 RKey2.Close();
                 RegistryKey RKey3 = Registry.ClassesRoot.OpenSubKey("mrexefile\\DefaultIcon", true);
                 RKey3.SetValue("", strPath);
                 RKey3.Close();
                 RegistryKey RKey4 = Registry.ClassesRoot.OpenSubKey("mrexefile\\shell", true);
                 RKey4.CreateSubKey("使用口令打开");
                 RKey4.Close();
                 RegistryKey RKey5 = Registry.ClassesRoot.OpenSubKey("mrexefile\\shell\\使用口令打开", true);
                 RKey5.CreateSubKey("command");
                 RKey5.Close();
                 RegistryKey RKey6 = Registry.ClassesRoot.OpenSubKey("mrexefile\\shell\\使用口令打开\\command", true);
                 RKey6.SetValue("", strName + " \\F %1");
                 RKey6.Close();
             }
             catch
             {
             }
         }
     }
 }