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   源码介绍

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Security.Cryptography;
using System.IO;

namespace DesFile
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.GroupBox groupBox1;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.TextBox textBox2;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.TextBox textBox3;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.TextBox textBox4;
		private System.Windows.Forms.Label label4;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.GroupBox groupBox2;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.Button button4;
		private System.Windows.Forms.TextBox textBox6;
		private System.Windows.Forms.Label label6;
		private System.Windows.Forms.TextBox textBox7;
		private System.Windows.Forms.Label label7;
		private System.Windows.Forms.TextBox textBox8;
		private System.Windows.Forms.Label label8;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.groupBox1 = new System.Windows.Forms.GroupBox();
			this.label1 = new System.Windows.Forms.Label();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.textBox2 = new System.Windows.Forms.TextBox();
			this.label2 = new System.Windows.Forms.Label();
			this.textBox3 = new System.Windows.Forms.TextBox();
			this.label3 = new System.Windows.Forms.Label();
			this.textBox4 = new System.Windows.Forms.TextBox();
			this.label4 = new System.Windows.Forms.Label();
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.groupBox2 = new System.Windows.Forms.GroupBox();
			this.button3 = new System.Windows.Forms.Button();
			this.button4 = new System.Windows.Forms.Button();
			this.textBox6 = new System.Windows.Forms.TextBox();
			this.label6 = new System.Windows.Forms.Label();
			this.textBox7 = new System.Windows.Forms.TextBox();
			this.label7 = new System.Windows.Forms.Label();
			this.textBox8 = new System.Windows.Forms.TextBox();
			this.label8 = new System.Windows.Forms.Label();
			this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.groupBox1.SuspendLayout();
			this.groupBox2.SuspendLayout();
			this.SuspendLayout();
			// 
			// groupBox1
			// 
			this.groupBox1.Controls.Add(this.button2);
			this.groupBox1.Controls.Add(this.button1);
			this.groupBox1.Controls.Add(this.textBox4);
			this.groupBox1.Controls.Add(this.label4);
			this.groupBox1.Controls.Add(this.textBox3);
			this.groupBox1.Controls.Add(this.label3);
			this.groupBox1.Controls.Add(this.textBox2);
			this.groupBox1.Controls.Add(this.label2);
			this.groupBox1.Controls.Add(this.textBox1);
			this.groupBox1.Controls.Add(this.label1);
			this.groupBox1.Location = new System.Drawing.Point(8, 8);
			this.groupBox1.Name = "groupBox1";
			this.groupBox1.Size = new System.Drawing.Size(336, 120);
			this.groupBox1.TabIndex = 0;
			this.groupBox1.TabStop = false;
			this.groupBox1.Text = "加密文件设置";
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(8, 24);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(96, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "被加密文件名：";
			// 
			// textBox1
			// 
			this.textBox1.BackColor = System.Drawing.SystemColors.Control;
			this.textBox1.Location = new System.Drawing.Point(104, 16);
			this.textBox1.Name = "textBox1";
			this.textBox1.ReadOnly = true;
			this.textBox1.Size = new System.Drawing.Size(224, 21);
			this.textBox1.TabIndex = 1;
			this.textBox1.Text = "";
			// 
			// textBox2
			// 
			this.textBox2.Location = new System.Drawing.Point(120, 40);
			this.textBox2.Name = "textBox2";
			this.textBox2.Size = new System.Drawing.Size(208, 21);
			this.textBox2.TabIndex = 3;
			this.textBox2.Text = "";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(8, 48);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(104, 16);
			this.label2.TabIndex = 2;
			this.label2.Text = "加密输出文件名：";
			// 
			// textBox3
			// 
			this.textBox3.Location = new System.Drawing.Point(120, 64);
			this.textBox3.Name = "textBox3";
			this.textBox3.PasswordChar = '*';
			this.textBox3.Size = new System.Drawing.Size(120, 21);
			this.textBox3.TabIndex = 5;
			this.textBox3.Text = "";
			// 
			// label3
			// 
			this.label3.Location = new System.Drawing.Point(8, 72);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(128, 16);
			this.label3.TabIndex = 4;
			this.label3.Text = "设定密码(大于6位)：";
			// 
			// textBox4
			// 
			this.textBox4.Location = new System.Drawing.Point(120, 88);
			this.textBox4.Name = "textBox4";
			this.textBox4.PasswordChar = '*';
			this.textBox4.Size = new System.Drawing.Size(120, 21);
			this.textBox4.TabIndex = 7;
			this.textBox4.Text = "";
			// 
			// label4
			// 
			this.label4.Location = new System.Drawing.Point(8, 96);
			this.label4.Name = "label4";
			this.label4.Size = new System.Drawing.Size(104, 16);
			this.label4.TabIndex = 6;
			this.label4.Text = "重复设定的密码：";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(248, 64);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(80, 23);
			this.button1.TabIndex = 8;
			this.button1.Text = "浏览文件";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(248, 88);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(80, 23);
			this.button2.TabIndex = 9;
			this.button2.Text = "加密文件";
			this.button2.Click  = new System.EventHandler(this.button2_Click);
			// 
			// groupBox2
			// 
			this.groupBox2.Controls.Add(this.button3);
			this.groupBox2.Controls.Add(this.button4);
			this.groupBox2.Controls.Add(this.textBox6);
			this.groupBox2.Controls.Add(this.label6);
			this.groupBox2.Controls.Add(this.textBox7);
			this.groupBox2.Controls.Add(this.label7);
			this.groupBox2.Controls.Add(this.textBox8);
			this.groupBox2.Controls.Add(this.label8);
			this.groupBox2.Location = new System.Drawing.Point(8, 136);
			this.groupBox2.Name = "groupBox2";
			this.groupBox2.Size = new System.Drawing.Size(336, 96);
			this.groupBox2.TabIndex = 1;
			this.groupBox2.TabStop = false;
			this.groupBox2.Text = "解密文件设置";
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(248, 64);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(80, 23);
			this.button3.TabIndex = 9;
			this.button3.Text = "解密文件";
			this.button3.Click  = new System.EventHandler(this.button3_Click);
			// 
			// button4
			// 
			this.button4.Location = new System.Drawing.Point(168, 64);
			this.button4.Name = "button4";
			this.button4.Size = new System.Drawing.Size(80, 23);
			this.button4.TabIndex = 8;
			this.button4.Text = "浏览文件";
			this.button4.Click  = new System.EventHandler(this.button4_Click);
			// 
			// textBox6
			// 
			this.textBox6.Location = new System.Drawing.Point(80, 64);
			this.textBox6.Name = "textBox6";
			this.textBox6.PasswordChar = '*';
			this.textBox6.Size = new System.Drawing.Size(88, 21);
			this.textBox6.TabIndex = 5;
			this.textBox6.Text = "";
			// 
			// label6
			// 
			this.label6.Location = new System.Drawing.Point(8, 72);
			this.label6.Name = "label6";
			this.label6.Size = new System.Drawing.Size(72, 16);
			this.label6.TabIndex = 4;
			this.label6.Text = "输入密码：";
			// 
			// textBox7
			// 
			this.textBox7.Location = new System.Drawing.Point(120, 40);
			this.textBox7.Name = "textBox7";
			this.textBox7.Size = new System.Drawing.Size(208, 21);
			this.textBox7.TabIndex = 3;
			this.textBox7.Text = "";
			// 
			// label7
			// 
			this.label7.Location = new System.Drawing.Point(8, 48);
			this.label7.Name = "label7";
			this.label7.Size = new System.Drawing.Size(104, 16);
			this.label7.TabIndex = 2;
			this.label7.Text = "解密输出文件名：";
			// 
			// textBox8
			// 
			this.textBox8.BackColor = System.Drawing.SystemColors.Control;
			this.textBox8.Location = new System.Drawing.Point(104, 16);
			this.textBox8.Name = "textBox8";
			this.textBox8.ReadOnly = true;
			this.textBox8.Size = new System.Drawing.Size(224, 21);
			this.textBox8.TabIndex = 1;
			this.textBox8.Text = "";
			// 
			// label8
			// 
			this.label8.Location = new System.Drawing.Point(8, 24);
			this.label8.Name = "label8";
			this.label8.Size = new System.Drawing.Size(96, 16);
			this.label8.TabIndex = 0;
			this.label8.Text = "已加密文件名：";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(352, 238);
			this.Controls.Add(this.groupBox2);
			this.Controls.Add(this.groupBox1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示加解密文件";
			this.groupBox1.ResumeLayout(false);
			this.groupBox2.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{//浏览被加密文件
			if(this.openFileDialog1.ShowDialog()==DialogResult.OK)
			{
				this.textBox1.Text=this.openFileDialog1.FileName;
			}		
		}

		private void button2_Click(object sender, System.EventArgs e)
		{//加密文件
			if(this.textBox1.Text=="")
			{//检查被加密文件
				MessageBox.Show("请选择被加密文件！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			if(this.textBox2.Text=="")
			{//检查加密输出文件
				MessageBox.Show("请输入加密输出文件！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			if (this.textBox3.Text.Length<6 | this.textBox3.Text!=this.textBox4.Text)
			{//检查密码输入是否正确
				MessageBox.Show("请输入正确的密码！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			//获得被加密文件名
			string MyInFileName=this.textBox1.Text;
			//获得加密输出文件名
			string MyOutFileName=this.textBox2.Text;
			//设定初始向量
			byte[]  MyDESIV={0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
			byte[]  MyDESKey={};
			//根据密码设置密钥大小
			string MyKeyString=this.textBox3.Text;			  
			if (MyKeyString.Length==6)
			{
				MyDESKey=new byte[]{(byte)MyKeyString[0],(byte)MyKeyString[1],(byte)MyKeyString[2],
									 (byte)MyKeyString[3],(byte)MyKeyString[4],(byte)MyKeyString[5],
									 0x07,0x08};
			}
			if (MyKeyString.Length==7)
			{
				MyDESKey=new byte[]{(byte)MyKeyString[0],(byte)MyKeyString[1],(byte)MyKeyString[2],
									 (byte)MyKeyString[3],(byte)MyKeyString[4],(byte)MyKeyString[5],
									 (byte)MyKeyString[6],0x07};			
			}
			if (MyKeyString.Length>=8)
			{
				MyDESKey=new byte[]{(byte)MyKeyString[0],(byte)MyKeyString[1],(byte)MyKeyString[2],
									   (byte)MyKeyString[3],(byte)MyKeyString[4],(byte)MyKeyString[5],
									   (byte)MyKeyString[6],(byte)MyKeyString[7]};
			}		
			//创建输入和输出文件流
			FileStream MyInFileStream = new FileStream(MyInFileName, FileMode.Open, FileAccess.Read);
			FileStream MyOutFileStream = new FileStream(MyOutFileName, FileMode.OpenOrCreate, FileAccess.Write);
			MyOutFileStream.SetLength(0);		    
			//每次的中间流.
			byte[] InsertData = new byte[100]; 
			//代表已经加密流的大小
			int CompletedLength=0;
			//代表要加密文件总的大小
			long InFileSize = MyInFileStream.Length; 
			//创建DES对象
			DES MyDES = new DESCryptoServiceProvider();     
			//创建加密流	
			CryptoStream EncryptStream = new CryptoStream(MyOutFileStream, MyDES.CreateEncryptor(MyDESKey, MyDESIV), CryptoStreamMode.Write);		            
			//从输入文件中读取流，然后加密到输出文件中
			while(CompletedLength < InFileSize)
			{	//每次写入加密文件的数据大小
				int Length= MyInFileStream.Read(InsertData, 0, 100);
				EncryptStream.Write(InsertData, 0, Length);
				CompletedLength = CompletedLength   Length;
			}		    
			//关闭流
			EncryptStream.Close();  
			MyOutFileStream.Close();
			MyInFileStream.Close();                   
			MessageBox.Show("文件加密已经操作成功！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);		
		}

		private void button4_Click(object sender, System.EventArgs e)
		{//浏览被解密文件
			if(this.openFileDialog1.ShowDialog()==DialogResult.OK)
			{
				this.textBox8.Text=this.openFileDialog1.FileName;
			}				
		}
		private void button3_Click(object sender, System.EventArgs e)
		{//解密文件
			if(this.textBox8.Text=="")
			{//检查被解密文件
				MessageBox.Show("请选择被解密文件！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			if(this.textBox7.Text=="")
			{//检查解密输出文件
				MessageBox.Show("请输入解密输出文件！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			if (this.textBox6.Text.Length<6 )
			{//检查密码是否输入
				MessageBox.Show("请输入正确的密码！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
			try
			{	    		
			//获得要解密的文件名
			string MyInFileName=this.textBox8.Text;
			//获得要保存的文件名
			string MyOutFileName=this.textBox7.Text;
			//设定初始向量
			byte[]  MyDESIV={0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
			byte[]  MyDESKey={};
			//根据密码算出密钥
			string MyKeyString=this.textBox6.Text;			    
			if (MyKeyString.Length==6)
			{
				MyDESKey=new byte[]{(byte)MyKeyString[0],(byte)MyKeyString[1],(byte)MyKeyString[2],
									 (byte)MyKeyString[3],(byte)MyKeyString[4],(byte)MyKeyString[5],
									 0x07,0x08};
			}
			if (MyKeyString.Length==7)
			{
				MyDESKey=new byte[]{(byte)MyKeyString[0],(byte)MyKeyString[1],(byte)MyKeyString[2],
									 (byte)MyKeyString[3],(byte)MyKeyString[4],(byte)MyKeyString[5],
									 (byte)MyKeyString[6],0x07};			
			}
			if (MyKeyString.Length>=8)
			{
				MyDESKey=new byte[]{(byte)MyKeyString[0],(byte)MyKeyString[1],(byte)MyKeyString[2],
									 (byte)MyKeyString[3],(byte)MyKeyString[4],(byte)MyKeyString[5],
									 (byte)MyKeyString[6],(byte)MyKeyString[7]};
			}
			   //创建输入和输出文件流
				FileStream MyInFileStream = new FileStream(MyInFileName, FileMode.Open, FileAccess.Read);
				FileStream MyOutFileStream = new FileStream(MyOutFileName, FileMode.OpenOrCreate, FileAccess.Write);
				MyOutFileStream.SetLength(0);       
				//每次的中间流.
				byte[] InsertData = new byte[100]; 
				//代表已经解密的流的大小
				int MyCompletedSize=0;
				//代表要解密文件总的大小
				long MyFileSize = MyInFileStream.Length; 
				//创建DES对象
				DES MyDES= new DESCryptoServiceProvider();     
				//创建解密流
				CryptoStream DecryptStream = new  CryptoStream(MyOutFileStream, MyDES.CreateDecryptor(MyDESKey,MyDESIV), CryptoStreamMode.Write);
				//从输入文件中读取流，然后解密到输出文件中
				while(MyCompletedSize < MyFileSize)
				{	//每次写入解密流的大小
					int length = MyInFileStream.Read(InsertData, 0, 100);
					DecryptStream.Write(InsertData, 0, length);
					MyCompletedSize=MyCompletedSize length;
				} 
				//关闭流		
				DecryptStream.Close();  
				MyOutFileStream.Close();
				MyInFileStream.Close();     				
				MessageBox.Show("文件解密操作成功！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
			catch (Exception Err)
			{
				MessageBox.Show("文件解密操作有误: " Err.Message,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Error);			
			}	

		}
	}
}