.NET如何实现数据加密

/china/technet/security/guidance/secmod39.mspx(最好的理论资料）

建立一个win form程序，然后把代码拷到后台，即可实现C#非对称加密程序 。

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using System.IO;

using System.Text;

using System.Security.Cryptography;

namespace 非对称加密

{

/// <summary>

/// Form1 的摘要说明。

/// </summary>

public class Form1 : System.Windows.Forms.Form

{

private System.Windows.Forms.TabControl tabControl1;

private System.Windows.Forms.TabPage tabPage1;

private System.Windows.Forms.TabPage tabPage2;

private System.Windows.Forms.Button button1;

private System.Windows.Forms.Button button2;

private System.Windows.Forms.Button button3;

private System.Windows.Forms.SaveFileDialog save;

private System.Windows.Forms.Label label1;

private System.Windows.Forms.TextBox textBox1;

private System.Windows.Forms.Button button4;

private System.Windows.Forms.Button button5;

private System.Windows.Forms.Label label2;

private System.Windows.Forms.RichTextBox richtext2;

private System.Windows.Forms.OpenFileDialog open;

private System.Windows.Forms.Label label3;

private System.Windows.Forms.RichTextBox richtext3;

private System.Windows.Forms.RichTextBox richtext;

private System.Windows.Forms.Button button6;

private System.Windows.Forms.Button button7;

private System.Windows.Forms.Button button8;

/// <summary>

/// 必需的设计器变量。

private static RSACryptoServiceProvider crypt;

private static string privatekey;

private static string publickey;

private static byte [] bytes;

private static string publicinfo;

private static string privateinfo;

private static string readpublickey;

private static string readprivatekey;

// ///private static byte [] onebytes ;

/// </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.tabControl1 = new System.Windows.Forms.TabControl();

this.tabPage1 = new System.Windows.Forms.TabPage();

this.button6 = new System.Windows.Forms.Button();

this.button3 = new System.Windows.Forms.Button();

this.button2 = new System.Windows.Forms.Button();

this.richtext = new System.Windows.Forms.RichTextBox();

this.button1 = new System.Windows.Forms.Button();

this.tabPage2 = new System.Windows.Forms.TabPage();

this.button8 = new System.Windows.Forms.Button();

this.button7 = new System.Windows.Forms.Button();

this.label3 = new System.Windows.Forms.Label();

this.richtext3 = new System.Windows.Forms.RichTextBox();

this.label2 = new System.Windows.Forms.Label();

this.richtext2 = new System.Windows.Forms.RichTextBox();

this.button5 = new System.Windows.Forms.Button();

this.button4 = new System.Windows.Forms.Button();

this.textBox1 = new System.Windows.Forms.TextBox();

this.label1 = new System.Windows.Forms.Label();

this.save = new System.Windows.Forms.SaveFileDialog();

this.open = new System.Windows.Forms.OpenFileDialog();

this.tabControl1.SuspendLayout();

this.tabPage1.SuspendLayout();

this.tabPage2.SuspendLayout();

this.SuspendLayout();

//

// tabControl1

//

this.tabControl1.Controls.Add(this.tabPage1);

this.tabControl1.Controls.Add(this.tabPage2);

this.tabControl1.Location = new System.Drawing.Point(32, 64);

this.tabControl1.Name = "tabControl1";

this.tabControl1.SelectedIndex = 0;

this.tabControl1.Size = new System.Drawing.Size(416, 280);

this.tabControl1.TabIndex = 0;

//

// tabPage1

//

this.tabPage1.Controls.Add(this.button6);

this.tabPage1.Controls.Add(this.button3);

this.tabPage1.Controls.Add(this.button2);

this.tabPage1.Controls.Add(this.richtext);

this.tabPage1.Controls.Add(this.button1);

this.tabPage1.Location = new System.Drawing.Point(4, 21);

this.tabPage1.Name = "tabPage1";

this.tabPage1.Size = new System.Drawing.Size(408, 255);

this.tabPage1.TabIndex = 0;

this.tabPage1.Text = "得到钥匙";

//

// button6

//

this.button6.Location = new System.Drawing.Point(72, 168);

this.button6.Name = "button6";

this.button6.TabIndex = 4;

this.button6.Text = "写入文件";

this.button6.Click += new System.EventHandler(this.button6_Click);

//

// button3

//

this.button3.Location = new System.Drawing.Point(200, 16);

this.button3.Name = "button3";

this.button3.TabIndex = 3;

this.button3.Text = "保存私匙";

this.button3.Click += new System.EventHandler(this.button3_Click);

//

// button2

//

this.button2.Location = new System.Drawing.Point(128, 16);

this.button2.Name = "button2";

this.button2.TabIndex = 2;

this.button2.Text = "保存公钥";

this.button2.Click += new System.EventHandler(this.button2_Click);

//

// richtext

//

this.richtext.Location = new System.Drawing.Point(16, 56);

this.richtext.Name = "richtext";

this.richtext.Size = new System.Drawing.Size(256, 96);

this.richtext.TabIndex = 1;

this.richtext.Text = "richTextBox1";

//

// button1

//

this.button1.Location = new System.Drawing.Point(8, 16);

this.button1.Name = "button1";

this.button1.Size = new System.Drawing.Size(88, 23);

this.button1.TabIndex = 0;

this.button1.Text = "得到钥匙信息";

this.button1.Click += new System.EventHandler(this.button1_Click);

//

// tabPage2

//

this.tabPage2.Controls.Add(this.button8);

this.tabPage2.Controls.Add(this.button7);

this.tabPage2.Controls.Add(this.label3);

this.tabPage2.Controls.Add(this.richtext3);

this.tabPage2.Controls.Add(this.label2);

this.tabPage2.Controls.Add(this.richtext2);

this.tabPage2.Controls.Add(this.button5);

this.tabPage2.Controls.Add(this.button4);

this.tabPage2.Controls.Add(this.textBox1);

this.tabPage2.Controls.Add(this.label1);

this.tabPage2.Location = new System.Drawing.Point(4, 21);

this.tabPage2.Name = "tabPage2";

this.tabPage2.Size = new System.Drawing.Size(408, 255);

this.tabPage2.TabIndex = 1;

this.tabPage2.Text = "加密解密文字";

//

// button8

//

this.button8.Location = new System.Drawing.Point(216, 72);

this.button8.Name = "button8";

this.button8.TabIndex = 9;

this.button8.Text = "读取私匙";

this.button8.Click += new System.EventHandler(this.button8_Click);

//

// button7

//

this.button7.Location = new System.Drawing.Point(56, 72);

this.button7.Name = "button7";

this.button7.TabIndex = 8;

this.button7.Text = "读取公匙";

this.button7.Click += new System.EventHandler(this.button7_Click);

//

// label3

//

this.label3.Location = new System.Drawing.Point(200, 120);

this.label3.Name = "label3";

this.label3.Size = new System.Drawing.Size(100, 16);

this.label3.TabIndex = 7;

this.label3.Text = "解密结果";

//

// richtext3

//

this.richtext3.Location = new System.Drawing.Point(200, 144);

this.richtext3.Name = "richtext3";

this.richtext3.Size = new System.Drawing.Size(120, 72);

this.richtext3.TabIndex = 6;

this.richtext3.Text = "richTextBox2";

//

// label2

//

this.label2.Location = new System.Drawing.Point(48, 120);

this.label2.Name = "label2";

this.label2.Size = new System.Drawing.Size(128, 16);

this.label2.TabIndex = 5;

this.label2.Text = "加密窗口：";

//

// richtext2

//

this.richtext2.Location = new System.Drawing.Point(40, 144);

this.richtext2.Name = "richtext2";

this.richtext2.Size = new System.Drawing.Size(120, 72);

this.richtext2.TabIndex = 4;

this.richtext2.Text = "richTextBox2";

//

// button5

//

this.button5.Location = new System.Drawing.Point(200, 96);

this.button5.Name = "button5";

this.button5.Size = new System.Drawing.Size(112, 23);

this.button5.TabIndex = 3;

this.button5.Text = "使用私匙解密";

this.button5.Click += new System.EventHandler(this.button5_Click);

//

// button4

//

this.button4.Location = new System.Drawing.Point(48, 96);

this.button4.Name = "button4";

this.button4.Size = new System.Drawing.Size(96, 23);

this.button4.TabIndex = 2;

this.button4.Text = "使用公匙加密";

this.button4.Click += new System.EventHandler(this.button4_Click);

//

// textBox1

//

this.textBox1.Location = new System.Drawing.Point(104, 32);

this.textBox1.Multiline = true;

this.textBox1.Name = "textBox1";

this.textBox1.Size = new System.Drawing.Size(168, 32);

this.textBox1.TabIndex = 1;

this.textBox1.Text = "textBox1";

//

// label1

//

this.label1.Location = new System.Drawing.Point(128, 8);

this.label1.Name = "label1";

this.label1.Size = new System.Drawing.Size(120, 16);

this.label1.TabIndex = 0;

this.label1.Text = "请输入加密的文字";

//

// Form1

//

this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

this.ClientSize = new System.Drawing.Size(504, 357);

this.Controls.Add(this.tabControl1);

this.Name = "Form1";

this.Text = "Form1";

this.tabControl1.ResumeLayout(false);

this.tabPage1.ResumeLayout(false);

this.tabPage2.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());

}

//得到钥匙信息

private void button1_Click(object sender, System.EventArgs e)

{

crypt=new RSACryptoServiceProvider();

publickey=crypt.ToXmlString(false);

richtext.Text="导出秘匙的情况下：\n"+publickey+"\n";

privatekey=crypt.ToXmlString(true);

string info="仅仅导出公匙的情况下：\n"+privatekey+"\n";

richtext.AppendText(info);

crypt.Clear();

}

//保存公匙信息

private void button2_Click(object sender, System.EventArgs e)

{

save=new SaveFileDialog();

save.Filter="File Text (*.txt)|*.txt|All File (*.*)|*.*";

save.ShowDialog();

publicinfo=save.FileName;

}

//保存密匙信息

private void button3_Click(object sender, System.EventArgs e)

{

save=new SaveFileDialog();

save.Filter="File Text (*.txt)|*.txt|All File (*.*)|*.*";

save.ShowDialog();

privateinfo=save.FileName;

}

//把钥匙信息写入文件

private void button6_Click(object sender, System.EventArgs e)

{

StreamWriter one=new StreamWriter(publicinfo,true,UTF8Encoding.UTF8);

one.Write(publickey);

StreamWriter two=new StreamWriter(privateinfo,true,UTF8Encoding.UTF8);

two.Write(privatekey);

one.Flush();

two.Flush();

one.Close();

two.Close();

MessageBox.Show("成功保存公匙和密匙！");

}

//用公匙加密

private void button4_Click(object sender, System.EventArgs e)

{

crypt=new RSACryptoServiceProvider();

UTF8Encoding enc=new UTF8Encoding();

bytes=enc.GetBytes(textBox1.Text);

crypt.FromXmlString( readpublickey );

bytes = crypt.Encrypt( bytes,false );

string encryttext=enc.GetString(bytes);//encryptbyte);

richtext2.Text="加密结果：\n"+encryttext+"\n"+"加密结束！";

}

private void button5_Click(object sender, System.EventArgs e)

{

UTF8Encoding enc=new UTF8Encoding();

byte [] decryptbyte;

crypt.FromXmlString ( readprivatekey ) ;

decryptbyte = crypt.Decrypt( bytes,false );

string decrypttext=enc.GetString( decryptbyte );

richtext3.Text = "解密结果：\n" + decrypttext + "\n" + "解密结束！" ;

}

//从文件中读取公匙信息

private void button7_Click(object sender, System.EventArgs e)

{

StreamReader sr ;

open = new OpenFileDialog( );

open.Filter="Text File (*.txt)|*.txt|All File (*.*)|*.* ";

// open.ShowDialog();

if(open.ShowDialog()==DialogResult.OK)

{

sr = new StreamReader(open.FileName,UTF8Encoding.UTF8);

}

else

{

MessageBox.Show("发生错误！");

return;

}

readpublickey = sr.ReadToEnd();

sr.Close();

}

//从文件中读取私匙信息

private void button8_Click(object sender, System.EventArgs e)

{

open = new OpenFileDialog( );

open.Filter="Text File (*.txt)|*.txt|All File (*.*)|*.* ";

open.ShowDialog();

StreamReader sr = new StreamReader(open.FileName,UTF8Encoding.UTF8);

readprivatekey = sr.ReadToEnd();

sr.Close();

}

}

}