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