实例介绍
【实例简介】文件加密后，会重命名原文件的后缀为.mr, 当你选择该文件 进行解密时，输入当时的密码即可。
【实例截图】
【核心代码】
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.Threading;
using System.Security.Cryptography;
using Microsoft.Win32;
namespace ProtectFile
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
CheckForIllegalCrossThreadCalls = false;
}
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() == ".mr")
{
textBox1.Text = strFile;
button2.Enabled = false;
button3.Enabled = true;
}
}
catch { }
}
//选择加密、解密文件
private void button1_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
textBox1.Text = openFileDialog1.FileName;
FileInfo FInfo = new FileInfo(textBox1.Text);
if (FInfo.Extension.ToLower() == ".mr")
{
button2.Enabled = false;
button3.Enabled = true;
}
else
{
button2.Enabled = true;
button3.Enabled = false;
}
}
}
//加密
private void button2_Click(object sender, EventArgs e)
{
if (textBox1.Text != "")
{
if (textBox2.Text.Length < 6)
MessageBox.Show("密码不能小于6位！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
else
{
EDncrypt myEDncrypt = new EDncrypt(textBox1.Text, textBox2.Text, progressBar1);
myEDncrypt.StartEncrypt();
progressBar1.Value = 0;
}
}
}
//解密
private void button3_Click(object sender, EventArgs e)
{
if (textBox1.Text != "")
{
if (textBox2.Text.Length < 6)
MessageBox.Show("密码不能小于6位！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
else
{
EDncrypt myEDncrypt = new EDncrypt(textBox1.Text, textBox2.Text, progressBar1);
myEDncrypt.StartDncrypt();
progressBar1.Value = 0;
}
}
}
//创建快捷菜单
public static void FileMenu(string strPath, string strName)
{
try
{
Registry.ClassesRoot.CreateSubKey(".mr");
RegistryKey RKey1 = Registry.ClassesRoot.OpenSubKey(".mr", true);
RKey1.SetValue("", "mrfile");
RKey1.Close();
Registry.ClassesRoot.CreateSubKey("mrfile");
RegistryKey RKey2 = Registry.ClassesRoot.OpenSubKey("mrfile", true);
RKey2.CreateSubKey("DefaultIcon");
RKey2.CreateSubKey("shell");
RKey2.Close();
RegistryKey RKey3 = Registry.ClassesRoot.OpenSubKey("mrfile\\DefaultIcon", true);
RKey3.SetValue("", strPath);
RKey3.Close();
RegistryKey RKey4 = Registry.ClassesRoot.OpenSubKey("mrfile\\shell", true);
RKey4.CreateSubKey("解密");
RKey4.Close();
RegistryKey RKey5 = Registry.ClassesRoot.OpenSubKey("mrfile\\shell\\解密", true);
RKey5.CreateSubKey("command");
RKey5.Close();
RegistryKey RKey6 = Registry.ClassesRoot.OpenSubKey("mrfile\\shell\\解密\\command", true);
RKey6.SetValue("", strName " \\F %1");
RKey6.Close();
}
catch
{
}
}
}
#region 加密、解密类
class EDncrypt
{
#region 定义全局变量及类对象
private string strFile = "";
private string strNewFile = "";
private string strPwd = "";
private ProgressBar PBar = null;
private Thread EThread = null;
private Thread DThread = null;
#endregion
//含参数的构造函数，用来初始化全局变量及对象
public EDncrypt(string name, string pwd, ProgressBar pb)
{
strFile = name;
strPwd = pwd;
PBar = pb;
EThread = new Thread(new ThreadStart(this.myEThread));
DThread = new Thread(new ThreadStart(this.myDThread));
}
//文件加密
private void myEThread()
{
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(strFile, FileMode.Open, FileAccess.Read);
FileStream NewFStream = new FileStream(strFile ".mr", 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));
PBar.Maximum = MaxNum;
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;
try
{
if (PBar.Value < PBar.Maximum)
{
PBar.Value ;
}
}
catch
{
}
}
CStream.Close();
NewFStream.Close();
FStream.Close();
File.Delete(strFile);
MessageBox.Show("文件加密成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
//运行加密线程
public void StartEncrypt()
{
EThread.Start();
}
//文件解密
private void myDThread()
{
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(strFile, FileMode.Open, FileAccess.Read);
strNewFile = strFile.Substring(0, strFile.Length - 3);
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));
PBar.Maximum = MaxNum;
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;
try
{
if (PBar.Value < PBar.Maximum)
{
PBar.Value ;
}
}
catch
{
}
}
MessageBox.Show("文件解密成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch
{
MessageBox.Show("文件解密失败！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
finally
{
CStream.Close();
FStream.Close();
NewFStream.Close();
}
}
//运行解密线程
public void StartDncrypt()
{
DThread.Start();
}
}
#endregion
}
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