C#—非对称加密：加密文件-.NET教程,C#语言

c#—非对称加密：加密文件

★★★★★★ ☆☆☆ ★★★★★★

●●○○ 　 聂永 　　　○○●●

§§§§nie_yong@163.com§§§§

◆◆□□nie.yong@126.com□□◆◆

№№№№№№ ※※※ №№№№№№　　　

说明：

1.你要注意的是读取文件的两种不同方式；

2.从已经保存的钥匙文件中读取其内容；

3.这个程序做的很粗糙（要准备考外语六级，要准备期末考试，实在很忙啊！），希望诸位能够完善，然后也发表出来，在下表示感谢；

4.参考书目： 《c#数据安全手册》;

5.有做这方面程序的朋友，愿意相交。

代码部分：

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;

using system.threading;

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.tabpage tabpage3;

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;

private system.windows.forms.textbox textbox2;

private system.windows.forms.label label4;

private system.windows.forms.button button9;

private system.windows.forms.textbox textbox3;

private system.windows.forms.label label5;

private system.windows.forms.button button10;

private system.windows.forms.label label6;

private system.windows.forms.button button11;

private system.windows.forms.button button12;

private system.windows.forms.richtextbox richtext4;

private system.windows.forms.button button13;

private system.windows.forms.button button14;

private system.windows.forms.button button15;

private system.windows.forms.tabpage tabpage4;

private system.windows.forms.textbox textbox4;

private system.windows.forms.button button16;

private system.windows.forms.textbox textbox5;

private system.windows.forms.button button17;

private system.windows.forms.button button18;

private system.windows.forms.button button19;

private system.windows.forms.button button20;

private system.windows.forms.button button21;

private system.windows.forms.richtextbox richtext5;

/// <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;

//文件打开和是否读取钥匙的标记

private bool openla = false;

private bool savela = false;

private bool readpubkey=false;

private bool readprikey=false;

private thread th;

/// </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.tabpage3 = new system.windows.forms.tabpage();

this.button15 = new system.windows.forms.button();

this.button14 = new system.windows.forms.button();

this.button13 = new system.windows.forms.button();

this.button12 = new system.windows.forms.button();

this.button11 = new system.windows.forms.button();

this.richtext4 = new system.windows.forms.richtextbox();

this.label6 = new system.windows.forms.label();

this.button10 = new system.windows.forms.button();

this.label5 = new system.windows.forms.label();

this.textbox3 = new system.windows.forms.textbox();

this.button9 = new system.windows.forms.button();

this.label4 = new system.windows.forms.label();

this.textbox2 = new system.windows.forms.textbox();

this.tabpage4 = new system.windows.forms.tabpage();

this.save = new system.windows.forms.savefiledialog();

this.open = new system.windows.forms.openfiledialog();

this.textbox4 = new system.windows.forms.textbox();

this.button16 = new system.windows.forms.button();

this.textbox5 = new system.windows.forms.textbox();

this.button17 = new system.windows.forms.button();

this.button18 = new system.windows.forms.button();

this.button19 = new system.windows.forms.button();

this.button20 = new system.windows.forms.button();

this.button21 = new system.windows.forms.button();

this.richtext5 = new system.windows.forms.richtextbox();

this.tabcontrol1.suspendlayout();

this.tabpage1.suspendlayout();

this.tabpage2.suspendlayout();

this.tabpage3.suspendlayout();

this.tabpage4.suspendlayout();

this.suspendlayout();

//

// tabcontrol1

//

this.tabcontrol1.controls.add(this.tabpage1);

this.tabcontrol1.controls.add(this.tabpage2);

this.tabcontrol1.controls.add(this.tabpage3);

this.tabcontrol1.controls.add(this.tabpage4);

this.tabcontrol1.location = new system.drawing.point(8, 64);

this.tabcontrol1.name = "tabcontrol1";

this.tabcontrol1.selectedindex = 0;

this.tabcontrol1.size = new system.drawing.size(568, 368);

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(560, 343);

this.tabpage1.tabindex = 0;

this.tabpage1.text = "得到钥匙";

//

// button6

//

this.button6.location = new system.drawing.point(216, 288);

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(456, 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(320, 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(520, 184);

this.richtext.tabindex = 1;

this.richtext.text = "richtextbox1";

//

// button1

//

this.button1.location = new system.drawing.point(136, 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(560, 343);

this.tabpage2.tabindex = 1;

this.tabpage2.text = "加密解密文字";

//

// button8

//

this.button8.location = new system.drawing.point(368, 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(120, 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(304, 128);

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(280, 152);

this.richtext3.name = "richtext3";

this.richtext3.size = new system.drawing.size(272, 160);

this.richtext3.tabindex = 6;

this.richtext3.text = "richtextbox2";

//

// label2

//

this.label2.location = new system.drawing.point(48, 128);

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(8, 152);

this.richtext2.name = "richtext2";

this.richtext2.size = new system.drawing.size(256, 160);

this.richtext2.tabindex = 4;

this.richtext2.text = "richtextbox2";

//

// button5

//

this.button5.location = new system.drawing.point(352, 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(112, 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(264, 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";

//

// tabpage3

//

this.tabpage3.controls.add(this.button15);

this.tabpage3.controls.add(this.button14);

this.tabpage3.controls.add(this.button13);

this.tabpage3.controls.add(this.button12);

this.tabpage3.controls.add(this.button11);

this.tabpage3.controls.add(this.richtext4);

this.tabpage3.controls.add(this.label6);

this.tabpage3.controls.add(this.button10);

this.tabpage3.controls.add(this.label5);

this.tabpage3.controls.add(this.textbox3);

this.tabpage3.controls.add(this.button9);

this.tabpage3.controls.add(this.label4);

this.tabpage3.controls.add(this.textbox2);

this.tabpage3.location = new system.drawing.point(4, 21);

this.tabpage3.name = "tabpage3";

this.tabpage3.size = new system.drawing.size(560, 343);

this.tabpage3.tabindex = 2;

this.tabpage3.text = "加密解密文件";

//

// button15

//

this.button15.location = new system.drawing.point(208, 128);

this.button15.name = "button15";

this.button15.tabindex = 12;

this.button15.text = "清空文本";

this.button15.click += new system.eventhandler(this.button15_click);

//

// button14

//

this.button14.location = new system.drawing.point(432, 88);

this.button14.name = "button14";

this.button14.tabindex = 11;

this.button14.text = "读取私匙";

this.button14.click += new system.eventhandler(this.button14_click);

//

// button13

//

this.button13.location = new system.drawing.point(432, 32);

this.button13.name = "button13";

this.button13.tabindex = 10;

this.button13.text = "读取公匙";

this.button13.click += new system.eventhandler(this.button13_click);

//

// button12

//

this.button12.location = new system.drawing.point(320, 88);

this.button12.name = "button12";

this.button12.tabindex = 9;

this.button12.text = "开始解密";

this.button12.click += new system.eventhandler(this.button12_click);

//

// button11

//

this.button11.location = new system.drawing.point(320, 32);

this.button11.name = "button11";

this.button11.tabindex = 8;

this.button11.text = "开始加密";

this.button11.click += new system.eventhandler(this.button11_click);

//

// richtext4

//

this.richtext4.location = new system.drawing.point(8, 152);

this.richtext4.name = "richtext4";

this.richtext4.size = new system.drawing.size(496, 168);

this.richtext4.tabindex = 7;

this.richtext4.text = "";

//

// label6

//

this.label6.location = new system.drawing.point(16, 120);

this.label6.name = "label6";

this.label6.size = new system.drawing.size(168, 23);

this.label6.tabindex = 6;

this.label6.text = "加密与解密窗口：";

//

// button10

//

this.button10.location = new system.drawing.point(224, 88);

this.button10.name = "button10";

this.button10.tabindex = 5;

this.button10.text = "save …";

this.button10.click += new system.eventhandler(this.button10_click);

//

// label5

//

this.label5.location = new system.drawing.point(16, 64);

this.label5.name = "label5";

this.label5.size = new system.drawing.size(216, 16);

this.label5.tabindex = 4;

this.label5.text = "请保存加密好或者解密后的文件";

//

// textbox3

//

this.textbox3.location = new system.drawing.point(16, 88);

this.textbox3.name = "textbox3";

this.textbox3.size = new system.drawing.size(184, 21);

this.textbox3.tabindex = 3;

this.textbox3.text = "textbox3";

//

// button9

//

this.button9.location = new system.drawing.point(224, 32);

this.button9.name = "button9";

this.button9.tabindex = 2;

this.button9.text = "open …";

this.button9.click += new system.eventhandler(this.button9_click);

//

// label4

//

this.label4.location = new system.drawing.point(16, 8);

this.label4.name = "label4";

this.label4.size = new system.drawing.size(216, 16);

this.label4.tabindex = 1;

this.label4.text = "请选择要加密或者解密的文本文件";

//

// textbox2

//

this.textbox2.location = new system.drawing.point(16, 32);

this.textbox2.name = "textbox2";

this.textbox2.size = new system.drawing.size(184, 21);

this.textbox2.tabindex = 0;

this.textbox2.text = "textbox2";

//

// tabpage4

//

this.tabpage4.controls.add(this.richtext5);

this.tabpage4.controls.add(this.button21);

this.tabpage4.controls.add(this.button20);

this.tabpage4.controls.add(this.button19);

this.tabpage4.controls.add(this.button18);

this.tabpage4.controls.add(this.button17);

this.tabpage4.controls.add(this.textbox5);

this.tabpage4.controls.add(this.button16);

this.tabpage4.controls.add(this.textbox4);

this.tabpage4.location = new system.drawing.point(4, 21);

this.tabpage4.name = "tabpage4";

this.tabpage4.size = new system.drawing.size(560, 343);

this.tabpage4.tabindex = 3;

this.tabpage4.text = "加密解密其它文件";

//

// textbox4

//

this.textbox4.location = new system.drawing.point(24, 24);

this.textbox4.name = "textbox4";

this.textbox4.size = new system.drawing.size(240, 21);

this.textbox4.tabindex = 0;

this.textbox4.text = "textbox4";

//

// button16

//

this.button16.location = new system.drawing.point(304, 24);

this.button16.name = "button16";

this.button16.tabindex = 1;

this.button16.text = "打开";

this.button16.click += new system.eventhandler(this.button16_click);

//

// textbox5

//

this.textbox5.location = new system.drawing.point(24, 56);

this.textbox5.name = "textbox5";

this.textbox5.size = new system.drawing.size(240, 21);

this.textbox5.tabindex = 2;

this.textbox5.text = "textbox5";

//

// button17

//

this.button17.location = new system.drawing.point(304, 56);

this.button17.name = "button17";

this.button17.tabindex = 3;

this.button17.text = "保存";

this.button17.click += new system.eventhandler(this.button17_click);

//

// button18

//

this.button18.location = new system.drawing.point(48, 88);

this.button18.name = "button18";

this.button18.tabindex = 4;

this.button18.text = "读取公匙";

this.button18.click += new system.eventhandler(this.button18_click);

//

// button19

//

this.button19.location = new system.drawing.point(160, 88);

this.button19.name = "button19";

this.button19.tabindex = 5;

this.button19.text = "读取私匙";

this.button19.click += new system.eventhandler(this.button19_click);

//

// button20

//

this.button20.location = new system.drawing.point(112, 144);

this.button20.name = "button20";

this.button20.tabindex = 6;

this.button20.text = "加密文件";

this.button20.click += new system.eventhandler(this.button20_click);

//

// button21

//

this.button21.location = new system.drawing.point(232, 144);

this.button21.name = "button21";

this.button21.tabindex = 7;

this.button21.text = "解密文件";

this.button21.click += new system.eventhandler(this.button21_click);

//

// richtext5

//

this.richtext5.location = new system.drawing.point(88, 200);

this.richtext5.name = "richtext5";

this.richtext5.size = new system.drawing.size(304, 112);

this.richtext5.tabindex = 8;

this.richtext5.text = "";

//

// form1

//

this.autoscalebasesize = new system.drawing.size(6, 14);

this.clientsize = new system.drawing.size(584, 453);

this.controls.add(this.tabcontrol1);

this.name = "form1";

this.text = "form1";

this.tabcontrol1.resumelayout(false);

this.tabpage1.resumelayout(false);

this.tabpage2.resumelayout(false);

this.tabpage3.resumelayout(false);

this.tabpage4.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;

}

//用公匙加密

private void button4_click(object sender, system.eventargs e)

{

if(textbox1.text =="")

{

messagebox.show("加密文字信息不能为空！");

return;

}

if(readpubkey==false)

{

messagebox.show("请打开公钥所在的文件！");

return;

}

try

{

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);

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

}

catch

{

messagebox.show("请检查是否打开公匙或者公匙是否损坏！");

}

}

//使用私匙解密

private void button5_click(object sender, system.eventargs e)

{

if(readprikey==false)

{

messagebox.show("请打开密匙所在的文件！");

return;

}

try

{

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！" ;

}

catch

{

messagebox.show("请检查是否打开私匙或者私匙是否损坏！");

}

}

//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！");

}

//从文件中读取公匙信息

private void button7_click(object sender, system.eventargs e)

{

readpublickey = readpublickey();

readpubkey=true;

}

//从文件中读取私匙信息

private void button8_click(object sender, system.eventargs e)

{

readprivatekey = readprivatekey();

readprikey = true;

}

//打开加密或者解密的文件

private void button9_click(object sender, system.eventargs e)

{

open = new openfiledialog( );

open.filter="text file (*.txt)|*.txt|all files (*.*)|*.*";

open.showdialog();

textbox2.text=open.filename;

openla = true;

}

//保存加密或者解密的文件

private void button10_click(object sender, system.eventargs e)

{

try

{

save=new savefiledialog();

save.filter="file text (*.txt)|*.txt|all file (*.*)|*.*";

save.showdialog();

textbox3.text=save.filename;

savela = true;

}

catch

{

messagebox.show("请输入文件名字！");

return;

}

}

//加密文本文件

private void button11_click(object sender, system.eventargs e)

{

if(readpubkey != true)

{

messagebox.show("请打开公钥所在的文件！");

return;

}

if(openla==true&&savela==true)

{

crypt=new rsacryptoserviceprovider();

crypt.fromxmlstring( readpublickey );

utf8encoding enc=new utf8encoding();

//读取原文件到一个string 去啊

streamreader sr=new streamreader(textbox2.text,encoding.default);

string textinfo=sr.readtoend();

sr.close();

// richtext4.appendtext( "\n原文件内容：\n" + textinfo + "\n" );

//开始加密

string readinfo=encryptfile(textinfo,textbox3.text);

richtext4.appendtext( "加密文件已经保存到：" + textbox3.text + "\n" );

richtext4.appendtext( "加密结果：\n" + readinfo + "\n加密结束！" );

}

else

messagebox.show("请选择你要加密的文件或者要保存的文件！");

}

//解密文件

private void button12_click(object sender, system.eventargs e)

{

if(readprikey==false)

{

messagebox.show("请打开密匙所在的文件！");

return;

}

if(openla==true&&savela==true)

{

try

{

crypt=new rsacryptoserviceprovider();

crypt.fromxmlstring( readprivatekey );

string decryptinfo = decryptfile(textbox2.text,textbox3.text);

richtext4.appendtext( "解密文件已经保存到：" + textbox3.text+ "\n" );

richtext4.appendtext("解密结果：\n" + decryptinfo + "\n" + "解密结束！\n");

}

catch

{

messagebox.show("请检查密匙文件是否和公匙相对应或者密匙文件损坏！");

return;

}

}

else

messagebox.show("请选择你要解密的文件或者要保存的文件！");

}

//加密文件时候，同样要打开公钥匙

private void button13_click(object sender, system.eventargs e)

{

readpublickey = readpublickey();

readpubkey=true;

}

//解密文件时候，同样要打开私钥匙

private void button14_click(object sender, system.eventargs e)

{

readprivatekey =readprivatekey();

readprikey=true;

}

private void button15_click(object sender, system.eventargs e)

{

richtext4.clear();

}

//打开文件

private void button16_click(object sender, system.eventargs e)

{

open = new openfiledialog( );

open.filter="all files (*.*)|*.*";

open.showdialog();

textbox4.text=open.filename;

openla = true;

}

//保存文件

private void button17_click(object sender, system.eventargs e)

{

save=new savefiledialog();

save.filter="all file (*.*)|*.*";

save.showdialog();

textbox5.text=save.filename;

savela = true;

}

//加密其它非文本文件

private void encryptother(string file1,string file2)

{

filestream picfs=new filestream(@file1,filemode.open);

filestream fs=new filestream(@file2,filemode.openorcreate);

byte [] bytes=new byte[picfs.length];

picfs.read(bytes,0,(int)picfs.length);

picfs.close();

int blocksize=0;

if(crypt.keysize==1024)

blocksize=16;

else blocksize=8;

byte[]rawblock,encryblock;

for(int i=0;i<bytes.length;i+=blocksize)

{

if((bytes.length-i)>blocksize)

rawblock=new byte[blocksize];

else rawblock =new byte[bytes.length-i];

buffer.blockcopy(bytes,i,rawblock,0,rawblock.length);

encryblock=crypt.encrypt(rawblock,false);

fs.write(encryblock,0,encryblock.length);

}

fs.flush();

fs.close();

}

//解密其它非文本文件

private void decryptother(string fileone,string filetwo)

{

filestream fs=new filestream(@fileone,filemode.open);

filestream writopic=new filestream(@filetwo,filemode.create);

byte [] bytes=new byte[fs.length];

fs.read(bytes,0,(int)fs.length);

fs.close();

memorystream ms=new memorystream();

int keysize=crypt.keysize/8;

byte[]rawblock,decryptblock;

for(int i=0;i<bytes.length;i+=keysize)

{

if( ( bytes.length-i ) > keysize )

{

rawblock=new byte[keysize];

}

else

{rawblock =new byte[bytes.length-i];}

buffer.blockcopy(bytes,i,rawblock,0,rawblock.length);

decryptblock = crypt.decrypt( rawblock,false );

ms.write(decryptblock,0,decryptblock.length);

}

ms.position=0;

byte [] decode=new byte[ms.length];

ms.read(decode,0,(int)ms.length);

ms.close();

writopic.write(decode,0,decode.length);

writopic.close();

}

//创建一个函数，可以在线程中使用

private void decryptusingthread()

{

decryptother(textbox4.text,textbox5.text);

}

//读取公钥匙

private void button18_click(object sender, system.eventargs e)

{

readpublickey = readpublickey();

readpubkey=true;

}

//读取私钥匙

private void button19_click(object sender, system.eventargs e)

{

readprivatekey = readprivatekey();

readprikey=true;

}

// 加密其它非文本文件啦

private void button20_click(object sender, system.eventargs e)

{

if(readpubkey==false)

{

messagebox.show("请打开公匙所在的文件！");

return;

}

if(openla==true&&savela==true)

{

try

{

crypt=new rsacryptoserviceprovider();

crypt.fromxmlstring( readpublickey );

encryptother( textbox4.text,textbox5.text );

richtext5.appendtext("加密过程结束！：\n" + "加密文件已经保存到：\n" + textbox5.text + "\n");

}

catch

{

messagebox.show("请检查密匙文件是否和公匙相对应或者密匙文件损坏！");

return;

}

}

else

messagebox.show("请选择你要解密的文件或者要保存的文件！");

}

//解密其它文件啦

private void button21_click(object sender, system.eventargs e)

{

if(readprikey==false)

{

messagebox.show("请打开密匙所在的文件！");

return;

}

if(openla==true&&savela==true)

{

try

{

crypt=new rsacryptoserviceprovider();

crypt.fromxmlstring( readprivatekey );

//使用线程后，反而达不到效果 //原因？暂时不清晰

//可以转换，但是转换要经过几分钟，才可以真正得到想要的转换的东西。

th = new thread( new threadstart( decryptusingthread ) );

th.start();

// decryptother(textbox4.text,textbox5.text);

richtext5.appendtext( "解密结束！\n" + "解密文件已经保存到：" + textbox5.text+ "\n" );

}

catch

{

messagebox.show("请检查密匙文件是否和公匙相对应或者密匙文件损坏！");

return;

}

}

else

messagebox.show("请选择你要解密的文件或者要保存的文件！");

}

//下面为自己定义的函数啦

//单独一个读取公匙的函数

private string readpublickey()

{

string publickey;

open = new openfiledialog( );

open.filter="text file (*.txt)|*.txt|all file (*.*)|*.* ";

open.showdialog();

streamreader sr = new streamreader(open.filename,utf8encoding.utf8);

publickey = sr.readtoend();

sr.close();

return publickey;

}

//单独一个读取私匙的函数

private string readprivatekey()

{

string privatekey;

open = new openfiledialog( );

open.filter="text file (*.txt)|*.txt|all file (*.*)|*.* ";

open.showdialog();

streamreader sr = new streamreader(open.filename,utf8encoding.utf8);

privatekey = sr.readtoend();

sr.close();

return privatekey;

}

//加密文本文件

private string encryptfile( string textinfo, string filename )

{

utf8encoding enc=new utf8encoding();

byte [] bytes=enc.getbytes( textinfo );

int blocksize=0;

if(crypt.keysize==1024)

blocksize=16;

else

blocksize=8;

//同时写入到内存中去

memorystream ms=new memorystream();

//写入文件中去啊。

filestream fs=new filestream(@filename,filemode.openorcreate);

byte[]rawblock,encryblock;

for(int i=0;i<bytes.length;i+=blocksize)

{

if((bytes.length-i)>blocksize)

rawblock=new byte[blocksize];

else

rawblock =new byte[bytes.length-i];

buffer.blockcopy(bytes,i,rawblock,0,rawblock.length);

encryblock=crypt.encrypt(rawblock,false);

fs.write(encryblock,0,encryblock.length);

//写入到内存中去啊。

ms.write(encryblock,0,encryblock.length);

}

//写入到内存中

ms.position = 0;

byte [] decode = new byte[ms.length];

ms.read(decode,0,(int)ms.length);

string decodeinfo = enc.getstring(decode,0,decode.length);

fs.flush();

fs.close();

ms.close();

return decodeinfo;

}

//解密文本文件

private string decryptfile(string encryptfile,string decryptfile)

{

//打开加密后的文件，读取文件内容

filestream fs=new filestream(@encryptfile,filemode.open);

byte [] bytes=new byte[fs.length];

fs.read(bytes,0,(int)fs.length);

fs.close();

//先写入到内存

memorystream ms=new memorystream();

//最好写入到解密后的一个文件

streamwriter sw=new streamwriter(decryptfile);

int keysize=crypt.keysize/8;

byte[]rawblock,decryptblock;

for(int i=0;i<bytes.length;i+=keysize)

{

if( ( bytes.length-i ) > keysize )

{

rawblock=new byte[keysize];

}

else

{rawblock =new byte[bytes.length-i];}

buffer.blockcopy(bytes,i,rawblock,0,rawblock.length);

decryptblock = crypt.decrypt( rawblock,false );

ms.write(decryptblock,0,decryptblock.length);

}

ms.position=0;

byte [] decode=new byte[ms.length];

ms.read(decode,0,(int)ms.length);

utf8encoding enc=new utf8encoding();

string text=enc.getstring(decode);

//写入到内存中去啊

sw.write(text);

sw.flush();

ms.close();

sw.close();

return text;

}

//加密其它非文本文件，当然可以包括文本文件

private void encryptother(string file1,string file2)

{

filestream picfs=new filestream(@file1,filemode.open);

filestream fs=new filestream(@file2,filemode.openorcreate);

byte [] bytes=new byte[picfs.length];

picfs.read(bytes,0,(int)picfs.length);

picfs.close();

int blocksize=0;

if(crypt.keysize==1024)

blocksize=16;

else blocksize=8;

byte[]rawblock,encryblock;

for(int i=0;i<bytes.length;i+=blocksize)

{

if((bytes.length-i)>blocksize)

rawblock=new byte[blocksize];

else rawblock =new byte[bytes.length-i];

buffer.blockcopy(bytes,i,rawblock,0,rawblock.length);

encryblock=crypt.encrypt(rawblock,false);

fs.write(encryblock,0,encryblock.length);

}

fs.flush();

fs.close();

}

//解密其它非文本文件，当然可以包括文本文件

private void decryptother(string fileone,string filetwo)

{

filestream fs=new filestream(@fileone,filemode.open);

filestream writopic=new filestream(@filetwo,filemode.create);

byte [] bytes=new byte[fs.length];

fs.read(bytes,0,(int)fs.length);

fs.close();

memorystream ms=new memorystream();

int keysize=crypt.keysize/8;

byte[]rawblock,decryptblock;

for(int i=0;i<bytes.length;i+=keysize)

{

if( ( bytes.length-i ) > keysize )

{

rawblock=new byte[keysize];

}

else

{rawblock =new byte[bytes.length-i];}

buffer.blockcopy(bytes,i,rawblock,0,rawblock.length);

decryptblock = crypt.decrypt( rawblock,false );

ms.write(decryptblock,0,decryptblock.length);

}

ms.position=0;

byte [] decode=new byte[ms.length];

ms.read(decode,0,(int)ms.length);

ms.close();

writopic.write(decode,0,decode.length);

writopic.close();

}

//创建一个函数，可以在线程中使用，经实验，效果不明显

private void decryptusingthread()

{

decryptother(textbox4.text,textbox5.text);

}

}

}