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java实验四

时间:2015-06-12 00:43:02      阅读:127      评论:0      收藏:0      [点我收藏+]

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北京电子科技学院(BESTI)

实  验  报  告

 课程: Java        班级:1352          姓名:黄卫         学号:201352221

 成绩:               指导教师:娄嘉鹏    实验日期:2015.6.11

实验密级:         预习程度:             实验时间:15:30~18:00

仪器组次:21         必修/选修:选修       实验序号:(四)

实验名称:Java面向对象程序设计

实验目的:

1.掌握Java网络编程的方法;

2.掌握Java安全编程的方法;

3. 能综合使用各种技术; 

实验内容一:

1.运行教材上TCP代码,结对进行,一人服务器,一人客户端。

2.利用加解密代码包,编译运行代码,客户端加密,服务器解密。

3.客户端加密明文后将密文通过TCP发送。

4.加密使用DES,DES加密密钥key发送至服务器,使用服务器的公钥加密,公钥算法使用RSA,检验发送信息的完整性使用MD5。

结对网络编程技术分享

实验代码服务器

// file name:ComputeTCPServer.java import java.net.*;

import java.io.*;

import java.security.*;

import java.security.spec.*;

import javax.crypto.*;

import javax.crypto.spec.*;

import javax.crypto.interfaces.*;

import java.security.interfaces.*;

import java.math.*;

public class ComputeTCPServer{

public static void main(String srgs[]) throws Exception {        

ServerSocket sc = null;        

Socket socket=null;            

try { sc= new ServerSocket(4421);

//创建服务器套接字 System.out.println("端口号:" + sc.getLocalPort());            

System.out.println("服务器已经启动...");

socket = sc.accept();  

//等待客户端连接 System.out.println("已经建立连接");                

//获得网络输入流对象的引用 BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));                

////获得网络输出流对象的引用 PrintWriter out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);
String aline2=in.readLine();

BigInteger c=new BigInteger(aline2);

FileInputStream f=new FileInputStream("Skey_RSA_priv.dat");

ObjectInputStream b=new ObjectInputStream(f);

RSAPrivateKey prk=(RSAPrivateKey)b.readObject( );

BigInteger d=prk.getPrivateExponent();

BigInteger n=prk.getModulus();

//System.out.println("d= "+d);

//System.out.println("n= "+n);

BigInteger m=c.modPow(d,n);

//System.out.println("m= "+m);

byte[] keykb=m.toByteArray();

//String aline3=new String(mt,"UTF8");

//String aline3=parseByte2HexStr(byte buf[]);
String aline=in.readLine();

//读取客户端传送来的数据 //

FileInputStream 

f2=new FileInputStream("keykb1.dat");

//int num2=f2.available();

//byte[] keykb=new byte[num2];         

//f2.read(keykb);

byte[] ctext=parseHexStr2Byte(aline);

Key k=new  SecretKeySpec(keykb,"DESede");

Cipher cp=Cipher.getInstance("DESede");

cp.init(Cipher.DECRYPT_MODE, k);

byte []ptext=cp.doFinal(ctext);
String p=new String(ptext,"UTF8");

System.out.println("从客户端接收到信息为:"+p);

//通过网络输出流返回结果给客户端
/*String aline2=in.readLine();

BigInteger c=new BigInteger(aline2);

FileInputStream f=new FileInputStream("Skey_RSA_priv.dat");

ObjectInputStream b=new ObjectInputStream(f);

RSAPrivateKey prk=(RSAPrivateKey)b.readObject( );

BigInteger d=prk.getPrivateExponent();

BigInteger n=prk.getModulus();

//System.out.println("d= "+d);

//System.out.println("n= "+n);

BigInteger m=c.modPow(d,n);

//System.out.println("m= "+m);

byte[] mt=m.toByteArray();

//String aline3=new String(mt,"UTF8");*/
String aline3=in.readLine();

String x=p;

MessageDigest m2=MessageDigest.getInstance("MD5");         

m2.update(x.getBytes( ));         

byte a[ ]=m2.digest( );         

String result="";         

for (int i=0; i<a.length; i++){            

result+=Integer.toHexString((0x000000ff & a[i]) | 0xffffff00).substring(6);     

}         

System.out.println(result);
if(aline3.equals(result))

{ System.out.println("匹配成功");

}
out.println("匹配成功");

out.close();

in.close();

sc.close();            

}

catch (Exception e)

{            

System.out.println(e);        

}    

}

public static String parseByte2HexStr(byte buf[])

{         

StringBuffer sb = new StringBuffer();         

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

{              String hex = Integer.toHexString(buf[i] & 0xFF);             

if (hex.length() == 1)

{                 

hex = ‘0‘ + hex;             

}             

sb.append(hex.toUpperCase());         

}         

return sb.toString();     

public static byte[] parseHexStr2Byte(String hexStr) {         

if (hexStr.length() < 1)             

return null;         

byte[] result = new byte[hexStr.length()/2];         

for (int i = 0;i< hexStr.length()/2; i++) {             

int high = Integer.parseInt(hexStr.substring(i*2, i*2+1 ), 16);             

int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);             

result[i] = (byte) (high * 16 + low);         

}         

return result;     

}

客户端

// file name:ComputeTCPClient.java import java.net.*;

import java.io.*;

import java.security.*;

import javax.crypto.*;

import javax.crypto.spec.*;

import java.security.spec.*;

import javax.crypto.interfaces.*;

import java.security.interfaces.*;

import java.math.*;

public class ComputeTCPClient

{    

public static void main(String srgs[]) throws Exception

{      

try

{

KeyGenerator kg=KeyGenerator.getInstance("DESede");

kg.init(168);

SecretKey k=kg.generateKey( );

byte[] ptext2=k.getEncoded();

//String kstr=parseByte2HexStr(kb);
           //创建连接特定服务器的指定端口的Socket对象 Socket socket = new Socket("10.1.0.80", 4421);            

//获得从服务器端来的网络输入流

BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));             //获得从客户端向服务器端输出数据的网络输出流

PrintWriter out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);             //创建键盘输入流,以便客户端从键盘上输入信息 BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
FileInputStream f3=new FileInputStream("Skey_RSA_pub.dat"); ObjectInputStream b2=new ObjectInputStream(f3);

RSAPublicKey  pbk=(RSAPublicKey)b2.readObject( );

BigInteger e=pbk.getPublicExponent();

BigInteger n=pbk.getModulus();

//System.out.println("e= "+e);

//System.out.println("n= "+n);

//byte ptext2[]=kstr.getBytes("UTF8");

BigInteger m=new BigInteger(ptext2);

BigInteger c=m.modPow(e,n);

//System.out.println("c= "+c);

String cs=c.toString( );            

out.println(cs);  //通过网络传送到服务器
System.out.print("请输入待发送的数据:"); 

String s=stdin.readLine();

//从键盘读入待发送的数据

Cipher cp=Cipher.getInstance("DESede");

cp.init(Cipher.ENCRYPT_MODE, k);

byte ptext[]=s.getBytes("UTF8");

byte ctext[]=cp.doFinal(ptext);

String str=parseByte2HexStr(ctext);            

out.println(str);  //通过网络传送到服务器
String x=s;

MessageDigest m2=MessageDigest.getInstance("MD5");

m2.update(x.getBytes( ));

byte a[ ]=m2.digest( );

String result="";

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

{            

result+=Integer.toHexString((0x000000ff & a[i]) | 0xffffff00).substring(6);

}

System.out.println(result); out.println(result);
/*s=result;

FileInputStream f3=new FileInputStream("Skey_RSA_pub.dat");

ObjectInputStream b2=new ObjectInputStream(f3);

RSAPublicKey  pbk=(RSAPublicKey)b2.readObject( );

BigInteger e=pbk.getPublicExponent();

BigInteger n=pbk.getModulus();

//System.out.println("e= "+e);

//System.out.println("n= "+n);

byte ptext2[]=s.getBytes("UTF8");

BigInteger m=new BigInteger(ptext2);

BigInteger c=m.modPow(e,n);

//System.out.println("c= "+c);

String cs=c.toString( );            

out.println(cs);  //通过网络传送到服务器*/
str=in.readLine();

//从网络输入流读取结果

System.out.println( "从服务器接收到的结果为:"+str);

//输出服务器返回的结果 } catch (Exception e) {             System.out.println(e);

        } finally{ //stdin.close();

//in.close();

//out.close();

//socket.close();

}
     }

public static String parseByte2HexStr(byte buf[])

{          StringBuffer sb = new StringBuffer();

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

{              String hex = Integer.toHexString(buf[i] & 0xFF);

              if (hex.length() == 1)

{                  hex = ‘0‘ + hex;             

}             

sb.append(hex.toUpperCase());         

}         

return sb.toString();     

}  public static byte[] parseHexStr2Byte(String hexStr)

{          if (hexStr.length() < 1)             

return null;         

byte[] result = new byte[hexStr.length()/2];         

for (int i = 0;i< hexStr.length()/2; i++)

{              int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);             

int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);             

result[i] = (byte) (high * 16 + low);         

}         

return result;     

}

统计的PSP(Personal Software Process)时间:

步骤

耗时(min

百分比

需求分析

30

14.2%

设计

60

28.4%

代码实现

60

28.4%

测试

30

14.2%

分析总结

30

14.2%

 

实验体会,自己独自坐还是有一定困难,但是在请教同学的情况下,还是勉强把实验内容完成出来了

小组成员:龚睿:http://www.cnblogs.com/KG35/

java实验四

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原文地址:http://www.cnblogs.com/KG35/p/4570600.html

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