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   源码介绍

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可以用于文本文件或字符串的加密，配置数据库连接字符串时，可以使用到的。

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 MyDES
{

	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{	
		#region  自动生成的代码
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.TextBox textBox2;
		private System.Windows.Forms.Button button4;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.SaveFileDialog saveFileDialog1;
		private System.Windows.Forms.Button button5;
		private System.Windows.Forms.TextBox textBox4;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.Label label4;
		/// <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.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.button3 = new System.Windows.Forms.Button();
			this.textBox2 = new System.Windows.Forms.TextBox();
			this.button4 = new System.Windows.Forms.Button();
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
			this.button5 = new System.Windows.Forms.Button();
			this.textBox4 = new System.Windows.Forms.TextBox();
			this.label3 = new System.Windows.Forms.Label();
			this.label4 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(444, 75);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(64, 23);
			this.button1.TabIndex = 0;
			this.button1.Text = "选择文件";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(332, 163);
			this.button2.Name = "button2";
			this.button2.TabIndex = 1;
			this.button2.Text = "退出";
			this.button2.Click  = new System.EventHandler(this.button2_Click);
			// 
			// openFileDialog1
			// 
			this.openFileDialog1.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";
			this.openFileDialog1.RestoreDirectory = true;
			this.openFileDialog1.FileOk  = new System.ComponentModel.CancelEventHandler(this.openFileDialog1_FileOk);
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(108, 75);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(320, 21);
			this.textBox1.TabIndex = 2;
			this.textBox1.Text = "请填写或选择输入文件的完整路径";
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(132, 163);
			this.button3.Name = "button3";
			this.button3.TabIndex = 3;
			this.button3.Text = "加密";
			this.button3.Click  = new System.EventHandler(this.button3_Click);
			// 
			// textBox2
			// 
			this.textBox2.Location = new System.Drawing.Point(108, 112);
			this.textBox2.Name = "textBox2";
			this.textBox2.Size = new System.Drawing.Size(320, 21);
			this.textBox2.TabIndex = 4;
			this.textBox2.Text = "请填写或选择目标文件的完整路径";
			// 
			// button4
			// 
			this.button4.Location = new System.Drawing.Point(444, 115);
			this.button4.Name = "button4";
			this.button4.Size = new System.Drawing.Size(64, 23);
			this.button4.TabIndex = 5;
			this.button4.Text = "选择文件";
			this.button4.Click  = new System.EventHandler(this.button4_Click);
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(36, 75);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(72, 24);
			this.label1.TabIndex = 6;
			this.label1.Text = "输入文件：";
			this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(36, 115);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(72, 24);
			this.label2.TabIndex = 7;
			this.label2.Text = "输出文件：";
			this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// saveFileDialog1
			// 
			this.saveFileDialog1.Filter = "所有文件(*.*)|*.*|文本文件(*.txt)|*.txt";
			this.saveFileDialog1.FilterIndex = 2;
			this.saveFileDialog1.RestoreDirectory = true;
			// 
			// button5
			// 
			this.button5.Location = new System.Drawing.Point(236, 163);
			this.button5.Name = "button5";
			this.button5.TabIndex = 8;
			this.button5.Text = "解密";
			this.button5.Click  = new System.EventHandler(this.button5_Click);
			// 
			// textBox4
			// 
			this.textBox4.Location = new System.Drawing.Point(108, 35);
			this.textBox4.Name = "textBox4";
			this.textBox4.TabIndex = 10;
			this.textBox4.Text = "12345678";
			// 
			// label3
			// 
			this.label3.Location = new System.Drawing.Point(28, 35);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(80, 23);
			this.label3.TabIndex = 12;
			this.label3.Text = "指定的 Key：";
			this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// label4
			// 
			this.label4.Location = new System.Drawing.Point(216, 40);
			this.label4.Name = "label4";
			this.label4.Size = new System.Drawing.Size(200, 23);
			this.label4.TabIndex = 13;
			this.label4.Text = "(密钥必须为64byte位，既8个字符)";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(536, 205);
			this.Controls.Add(this.label4);
			this.Controls.Add(this.label3);
			this.Controls.Add(this.textBox4);
			this.Controls.Add(this.button5);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.button4);
			this.Controls.Add(this.textBox2);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.ForeColor = System.Drawing.SystemColors.ControlText;
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "简单DES加密器";
			this.Load  = new System.EventHandler(this.Form1_Load);
			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 Form1_Load(object sender, System.EventArgs e)
		{
			
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			if(openFileDialog1.ShowDialog() == DialogResult.OK)
			{
				this.textBox1.Text=this.openFileDialog1.FileName;
			}

		}

		private void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e)
		{
		
		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			this.Close();
		}

		private void button4_Click(object sender, System.EventArgs e)
		{
			if(saveFileDialog1.ShowDialog() == DialogResult.OK)
			{
				this.textBox2.Text=this.saveFileDialog1.FileName;
			}
		
		}


		#endregion

		private void button3_Click(object sender, System.EventArgs e)
		{//加密
			string Key = this.textBox4.Text;
			string IV = "12345678";//初始化向量设为"12345678"
			byte[] desKey=System.Text.ASCIIEncoding.ASCII.GetBytes( Key );
			byte[] desIV=System.Text.ASCIIEncoding.ASCII.GetBytes( IV );
			try
			{
				if(this.MyEncrypt(this.textBox1.Text,this.textBox2.Text,desKey,desIV))
					MessageBox.Show("文件加密成功");
			}
			catch(System.IO.FileNotFoundException)
			{
				MessageBox.Show("Error!\n" "输入文件不存在，请检查输入文件的路径。");
			}
			catch(System.IO.IOException)
			{
				MessageBox.Show("Error!\n" "输出文件正在使用，请选择其他文件。\n如果问题依然存在，请关闭该程序，重新运行！");
			}
			catch(System.Exception ee)
			{
				System.Windows.Forms.MessageBox.Show("未知错误!请认真阅读一下说明：\n" ee);
			}
		}


		private void button5_Click(object sender, System.EventArgs e)
		{//解密
			string Key = this.textBox4.Text;
			string IV = "12345678";//初始化向量设为"12345678"
			byte[] desKey=System.Text.ASCIIEncoding.ASCII.GetBytes(Key);
			byte[] desIV=System.Text.ASCIIEncoding.ASCII.GetBytes(IV);
			try
			{
				if(this.MyDecrypt(this.textBox1.Text,this.textBox2.Text,desKey,desIV))
					MessageBox.Show("文件解密成功");
			}
			catch(System.IO.FileNotFoundException)
			{
				MessageBox.Show("Error!\n" "输入文件不存在，请检查输入文件的路径。");
			}
			catch(System.IO.IOException)
			{
				MessageBox.Show("Error!\n" "输出文件正在使用，请选择其他文件。\n如果问题依然存在，请关闭该程序，重新运行！");
			}
			catch(System.Exception ee)
			{
				System.Windows.Forms.MessageBox.Show("未知错误!请认真阅读一下说明：\n" ee);
			}

		}

		
		#region 文件加密函数
		private bool MyEncrypt(String inName, String outName, byte[] desKey, byte[] desIV)
		{
			FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
			FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
			try
			{
				fout.SetLength(0);
				byte[] bin = new byte[100];
				long rdlen = 0;
				long totlen = fin.Length;
				int len;
				DES des = new DESCryptoServiceProvider();
				CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);

				//Read from the input file, then encrypt and write to the output file.
				while(rdlen < totlen)
				{
					len = fin.Read(bin, 0, 100);
					encStream.Write(bin, 0, len);
					rdlen = rdlen   len;
				}
				encStream.Close();  
				fout.Close();
				fin.Close();
			}
			catch(System.Security.Cryptography.CryptographicException)
			{
				MessageBox.Show("Error!\n" "密钥输入错误！\n密钥必须为 64 byte，既为8个字符！");
				fin.Close();
				fout.Close();
				return false;
			}
			catch(Exception e)
			{
				MessageBox.Show("Error\n" e);
				return false;
			}
			return true;
		}
	    #endregion

		#region 文件解密函数
		private bool MyDecrypt(String inName, String outName, byte[] desKey, byte[] desIV)
		{
			
			FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
			FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
			try
			{
				fout.SetLength(0);
				byte[] bin = new byte[100];
				long rdlen = 0;
				long totlen = fin.Length;
				int len;

				DES des = new DESCryptoServiceProvider();
				CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write);

				//Read from the input file, then encrypt and write to the output file.
				while(rdlen < totlen)
				{
					len = fin.Read(bin, 0, 100);
					encStream.Write(bin, 0, len);
					rdlen = rdlen   len;
				}
				encStream.Close();  
				fout.Close();
				fin.Close();
			}
			catch(System.Security.Cryptography.CryptographicException)
			{
				MessageBox.Show("Error!\n" "密钥和加密文件不匹配！\n"
					 "可能的原因有：\n"
					 "1.输入的密钥错误，请重新输入和加密文件相对应的正确密钥。\n"
					 "2.输入文件是没有加密过的文件，请选择已经加密的文件进行解密。");
				fin.Close();
				fout.Close();
				return false;
			}
			catch(Exception e)
			{
				MessageBox.Show("Error\n" e);
				return false;
			}			
			return true;
		}
		#endregion
	}
}