实例介绍
【实例简介】
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。
【实例截图】
【核心代码】
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
}
}
标签： DES encryption Decrypt 加密 加解密
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