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20155331实验五网络编程与安全

网络编程与安全-1

两人一组结对编程：

参考http://www.cnblogs.com/rocedu/p/6766748.html#SECDSA
结对实现中缀表达式转后缀表达式的功能 MyBC.java
结对实现从上面功能中获取的表达式中实现后缀表达式求值的功能,调用MyDC.java

截图：

代码：

while (tokenizer.hasMoreTokens())
    {
        token = tokenizer.nextToken();

        //如果是运算符，调用isOperator
        if (this.isOperator(token))
        {
            if(token.charAt(0)==')')
                while (Nch!='(')
                {
                    Nch=this.stack.pop();
                    if(Nch!='(')
                        Nextexpr=Nextexpr+" "+Nch;
                }
            Nch=' ';
            ch=this.stack.pop();
            this.stack.push(ch);
            if(('*'==token.charAt(0)&&(ch=='+'||ch=='-'))||('*'==token.charAt(0)&&ch==' ')||('*'==token.charAt(0)&&ch=='(')||
                    ('/'==token.charAt(0)&&(ch=='+'||ch=='-'))||('/'==token.charAt(0)&&ch==' ')||('/'==token.charAt(0)&&ch=='(')
                    ||('-'==token.charAt(0)&&(ch=='('||ch==' '))
                    ||('+'==token.charAt(0)&&(ch=='('||ch==' '))
                    || '('==token.charAt(0))
                this.stack.push(token.charAt(0));
            else if(token.charAt(0)!=')'){
                Nextexpr=Nextexpr+" "+this.stack.pop();
                ch=this.stack.pop();
                this.stack.push(ch);
                if(!(('*'==token.charAt(0)&&(ch=='+'||ch=='-'))||('*'==token.charAt(0)&&ch==' ')||('*'==token.charAt(0)&&ch=='(')||
                        ('/'==token.charAt(0)&&(ch=='+'||ch=='-'))||('/'==token.charAt(0)&&ch==' ')||('/'==token.charAt(0)&&ch=='(')
                        ||('-'==token.charAt(0)&&(ch=='('||ch==' '))
                        ||('+'==token.charAt(0)&&(ch=='('||ch==' '))
                        || '('==token.charAt(0))){
                    Nextexpr=Nextexpr+" "+this.stack.pop();
                }

                this.stack.push(token.charAt(0));
            }
        }
        else//如果是操作数
        {
            Nextexpr=Nextexpr+" "+token;
        }

    }
    while(!this.stack.empty())
    {
        Nextexpr=Nextexpr+" "+this.stack.pop();
    }

网络编程与安全-2

结对编程：1人负责客户端，一人负责服务器

注意责任归宿，要会通过测试证明自己没有问题
基于Java Socket实现客户端/服务器功能，传输方式用TCP
客户端让用户输入中缀表达式，然后把中缀表达式调用MyBC.java的功能转化为后缀表达式，把后缀表达式通过网络发送给服务器
服务器接收到后缀表达式，调用MyDC.java的功能计算后缀表达式的值，把结果发送给客户端
客户端显示服务器发送过来的结果

截图：

代码：

public class MyStack<T> implements SStack<T> {
private Object element[];
private int top;
public MyStack(int size){
    this.element = new Object[Math.abs(size)];
    this.top = -1;
}
public MyStack() {
    this(64);
}
public boolean isEmpty() {
    return this.top == -1;
}
public void push(T x) {
    if(x==null)
        return;
    if(this.top == element.length-1){
        Object[] temp = this.element;
        this.element = new Object[temp.length*2];
        for(int i = 0; i < temp.length; i++)
            this.element[i] = temp[i];
    }
    this.top++;
    this.element[this.top] = x;
}
public T pop() {
    return this.top==-1 ? null:(T)this.element[this.top--];
}
public T get() {
    return this.top==-1 ? null:(T)this.element[this.top];
}
}

sstack：

public interface SStack<T> {
    boolean isEmpty();
    void push(T x);
    T pop();
    T get();
}

Client：

import java.net.*;
import java.io.*;
public class TCPClient {
public static void main(String srgs[]) {
    try {
        //创建连接特定服务器的指定端口的Socket对象
        Socket socket = new Socket("127.0.0.1", 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));
        System.out.print("请输入待发送的数据：");
        String str=stdin.readLine(); //从键盘读入待发送的数据
        String postfix = MyBC.toPostfix(str);
        out.println(postfix);  //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();
    }
}

}
Service：

import java.net.*;
import java.io.*;
public class TCPServer{
public static void main(String srgs[]) {
    ServerSocket sc = null;
    Socket socket=null;
    try {
        NewMyDC evaluator = new NewMyDC();
        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 aline=in.readLine();//读取客户端传送来的数据
        System.out.println("从客户端接收到信息为："+aline); //通过网络输出流返回结果给客户端
        int result = evaluator.value(aline);
        out.println("Echo:" + result);
        out.close();
        in.close();
        sc.close();
    } catch (Exception e) {
        System.out.println(e);
    }
}
}

网络编程与安全-3

加密结对编程：1人负责客户端，一人负责服务器

注意责任归宿，要会通过测试证明自己没有问题
基于Java Socket实现客户端/服务器功能，传输方式用TCP
客户端让用户输入中缀表达式，然后把中缀表达式调用MyBC.java的功能转化为后缀表达式，把后缀表达式用3DES或AES算法加密后通过网络把密文发送给服务器
服务器接收到后缀表达式表达式后，进行解密（和客户端协商密钥，可以用数组保存），然后调用MyDC.java的
功能计算后缀表达式的值，把结果发送给客户端
客户端显示服务器发送过来的结果

截图：

代码：

Client：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

import java.io.*;
import java.security.*;
import java.util.Arrays;
import javax.crypto.*;

public class SocketClient {
// 搭建客户端
public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    MyBC mybc=new MyBC();
    try {
        Socket socket = new Socket("192.168.43.166",5329);
        System.out.println("客户端启动成功");
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter write = new PrintWriter(socket.getOutputStream());
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String readline;
        System.out.println("Client:" );
        readline = br.readLine();
        String line=mybc.evaluate(readline);
        FileInputStream f=new FileInputStream("key1.dat");
        ObjectInputStream b=new ObjectInputStream(f);
        Key k=(Key)b.readObject();
        Cipher cp=Cipher.getInstance("DESede");
        cp.init(Cipher.ENCRYPT_MODE, k);
        byte ptext[]=line.getBytes("UTF-8");


        byte ctext[]=cp.doFinal(ptext);
        String Str=new String(ctext,"ISO-8859-1");

        write.println(Str);
        write.flush();






            System.out.println("Server return:" + in.readLine());

        write.close();
        in.close();
        socket.close();

    } catch (Exception e) {
        System.out.println("can not listen to:" + e);
    }

}

}

Service：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;

public class SocketService {
public static void main(String[] args) throws IOException, IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {
    SocketService socketService = new SocketService();
    try {
        socketService.oneServer();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    }
}
public  void oneServer() throws IOException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    MyDC mydc=new MyDC();

    try{
        ServerSocket server=null;
        try{
            server=new ServerSocket(5204);
            System.out.println("服务器启动成功");
        }catch(Exception e) {
            System.out.println("没有启动监听："+e);
        }
        Socket socket=null;
        try{
            socket=server.accept();
        }catch(Exception e) {
            System.out.println("Error."+e);
        }
        String line;
        BufferedReader in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter writer=new PrintWriter(socket.getOutputStream());

        line=in.readLine();
        System.out.printf("密文=%s
",line);
        // 获取密钥
        byte[]ctext=line.getBytes("ISO-8859-1");
        FileInputStream  f2=new FileInputStream("keykb1.dat");
        int num2=f2.available();
        byte[ ] keykb=new byte[num2];
        System.out.printf("
");
        f2.read(keykb);
        SecretKeySpec k=new  SecretKeySpec(keykb,"DESede");
        // 解密
        Cipher cp=Cipher.getInstance("DESede");
        cp.init(Cipher.DECRYPT_MODE, k);
        byte []ptext=cp.doFinal(ctext);
        // 显示明文

        String p=new String(ptext,"UTF8");




        System.out.println("明文:"+p);
        int a;
        String Np="";
        for(int i=1;i<p.length();i++)
            Np+=p.charAt(i);
        a=mydc.evaluate(Np);

            writer.println(a);
            writer.flush();

        writer.close();
        in.close();
        socket.close();
        server.close();
    }catch(Exception e) {
        System.out.println("Error."+e);
    }
    // 获取密文

}

}

网络编程与安全-4

密钥分发结对编程：1人负责客户端，一人负责服务器

注意责任归宿，要会通过测试证明自己没有问题
基于Java Socket实现客户端/服务器功能，传输方式用TCP
客户端让用户输入中缀表达式，然后把中缀表达式调用MyBC.java的功能转化为后缀表达式，把后缀表达式用3DES或AES算法加密通过网络把密文发送给服务器
客户端和服务器用DH算法进行3DES或AES算法的密钥交换
服务器接收到后缀表达式表达式后，进行解密，然后调用MyDC.java的功能计算后缀表达式的值，把结果发送给客户端
客户端显示服务器发送过来的结果

截图：

代码：

service：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;

public class SocketService {
public static void main(String[] args) throws IOException, IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {
    SocketService socketService = new SocketService();
    try {
        socketService.oneServer(args);
    } catch (IOException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    }
}
public  void oneServer(String []args) throws IOException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    MyDC mydc=new MyDC();

    try{
        ServerSocket server=null;
        try{
            server=new ServerSocket(5329);
            System.out.println("服务器启动成功");
        }catch(Exception e) {
            System.out.println("没有启动监听："+e);
        }
        Socket socket=null;
        try{
            socket=server.accept();
        }catch(Exception e) {
            System.out.println("Error."+e);
        }
        String line;
        BufferedReader in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter writer=new PrintWriter(socket.getOutputStream());

        line=in.readLine();
        System.out.printf("密文=%s
",line);
        // 获取密钥
        byte[]ctext=line.getBytes("ISO-8859-1");
        // 读取对方的DH公钥
        FileInputStream f1=new FileInputStream(args[0]);
        ObjectInputStream b1=new ObjectInputStream(f1);
        PublicKey  pbk=(PublicKey)b1.readObject( );
        //读取自己的DH私钥
        FileInputStream f2=new FileInputStream(args[1]);
        ObjectInputStream b2=new ObjectInputStream(f2);
        PrivateKey  prk=(PrivateKey)b2.readObject( );
        // 执行密钥协定
        KeyAgreement ka=KeyAgreement.getInstance("DH");
        ka.init(prk);
        ka.doPhase(pbk,true);
        //生成共享信息
        byte[ ] sb=ka.generateSecret();
        byte[]ssb=new byte[24];
        for(int i=0;i<24;i++)
            ssb[i]=sb[i];
        SecretKeySpec k=new  SecretKeySpec(ssb,"DESede");

        // 解密
        Cipher cp=Cipher.getInstance("DESede");
        cp.init(Cipher.DECRYPT_MODE, k);
        byte []ptext=cp.doFinal(ctext);
        // 显示明文

        String p=new String(ptext,"UTF8");

        int a;


        System.out.println("明文:"+p);
        String Np="";
        for(int i=1;i<p.length();i++)
            Np+=p.charAt(i);
        a=mydc.evaluate(Np);

        writer.println(a);
        writer.flush();

        writer.close();
        in.close();
        socket.close();
        server.close();
    }catch(Exception e) {
        System.out.println("Error."+e);
    }
    // 获取密文

}

}

client：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

import java.io.*;
import java.security.*;
import java.util.Arrays;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;

public class SocketClient {
// 搭建客户端
public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    MyBC mybc=new MyBC();
    try {
        Socket socket = new Socket("192.168.43.252", 5219);
        System.out.println("客户端启动成功");
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter write = new PrintWriter(socket.getOutputStream());
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String readline;
        System.out.println("Client:" );
        readline = br.readLine();
        String line=mybc.evaluate(readline);

        // 读取对方的DH公钥
        FileInputStream f1=new FileInputStream(args[0]);
        ObjectInputStream b1=new ObjectInputStream(f1);
        PublicKey  pbk=(PublicKey)b1.readObject( );
        //读取自己的DH私钥
        FileInputStream f2=new FileInputStream(args[1]);
        ObjectInputStream b2=new ObjectInputStream(f2);
        PrivateKey  prk=(PrivateKey)b2.readObject( );
        // 执行密钥协定
        KeyAgreement ka=KeyAgreement.getInstance("DH");
        ka.init(prk);
        ka.doPhase(pbk,true);
        //生成共享信息
        byte[ ] sb=ka.generateSecret();
        System.out.println(sb.length);
        byte[]ssb=new byte[24];
        for(int i=0;i<24;i++)
            ssb[i]=sb[i];
        Key k=new SecretKeySpec(ssb,"DESede");



        Cipher cp=Cipher.getInstance("DESede");
        cp.init(Cipher.ENCRYPT_MODE, k);
        byte ptext[]=line.getBytes("UTF-8");


        byte ctext[]=cp.doFinal(ptext);
        String Str=new String(ctext,"ISO-8859-1");

        write.println(Str);
        write.flush();






        System.out.println("Server return:" + in.readLine());

        write.close();
        in.close();
        socket.close();

    } catch (Exception e) {
        System.out.println("can not listen to:" + e);
    }

}

}

网络编程与安全-5

完整性校验结对编程：1人负责客户端，一人负责服务器

注意责任归宿，要会通过测试证明自己没有问题
基于Java Socket实现客户端/服务器功能，传输方式用TCP
客户端让用户输入中缀表达式，然后把中缀表达式调用MyBC.java的功能转化为后缀表达式，把后缀表达式用3DES或AES算法加密通过网络把密文和明文的MD5値发送给服务器
客户端和服务器用DH算法进行3DES或AES算法的密钥交换
服务器接收到后缀表达式表达式后，进行解密，解密后计算明文的MD5值，和客户端传来的MD5进行比较，一致则调用MyDC.java的功能计算后缀表达式的值，把结果发送给客户端
客户端显示服务器发送过来的结果

截图：

代码：

Service：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;

public class SocketService {
public static void main(String[] args) throws IOException, IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {
    SocketService socketService = new SocketService();
    try {
        socketService.oneServer(args);
    } catch (IOException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    }
}
public  void oneServer(String []args) throws IOException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    MyDC mydc=new MyDC();

    try{
        ServerSocket server=null;
        try{
            server=new ServerSocket(5329);
            System.out.println("服务器启动成功");
        }catch(Exception e) {
            System.out.println("没有启动监听："+e);
        }
        Socket socket=null;
        try{
            socket=server.accept();
        }catch(Exception e) {
            System.out.println("Error."+e);
        }
        String line;
        BufferedReader in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter writer=new PrintWriter(socket.getOutputStream());

        line=in.readLine();
        System.out.printf("密文=%s
",line);
        // 获取密钥
        byte[]ctext=line.getBytes("ISO-8859-1");
        // 读取对方的DH公钥
        FileInputStream f1=new FileInputStream(args[0]);
        ObjectInputStream b1=new ObjectInputStream(f1);
        PublicKey  pbk=(PublicKey)b1.readObject( );
        //读取自己的DH私钥
        FileInputStream f2=new FileInputStream(args[1]);
        ObjectInputStream b2=new ObjectInputStream(f2);
        PrivateKey  prk=(PrivateKey)b2.readObject( );
        // 执行密钥协定
        KeyAgreement ka=KeyAgreement.getInstance("DH");
        ka.init(prk);
        ka.doPhase(pbk,true);
        //生成共享信息
        byte[ ] sb=ka.generateSecret();
        byte[]ssb=new byte[24];
        for(int i=0;i<24;i++)
            ssb[i]=sb[i];
        SecretKeySpec k=new  SecretKeySpec(ssb,"DESede");

        // 解密
        Cipher cp=Cipher.getInstance("DESede");
        cp.init(Cipher.DECRYPT_MODE, k);
        byte []ptext=cp.doFinal(ctext);
        // 显示明文

        String p=new String(ptext,"UTF8");

        int a;


        System.out.println("明文:"+p);
        String Np="";
        for(int i=1;i<p.length();i++)
            Np+=p.charAt(i);
        a=mydc.evaluate(Np);

        writer.println(a);
        writer.flush();

        writer.close();
        in.close();
        socket.close();
        server.close();
    }catch(Exception e) {
        System.out.println("Error."+e);
    }
    // 获取密文

}

}
Client：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

import java.io.*;
import java.security.*;
import java.util.Arrays;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;

public class SocketClient {
// 搭建客户端
public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    MyBC mybc=new MyBC();
    try {
        Socket socket = new Socket("192.168.43.252", 5219);
        System.out.println("客户端启动成功");
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter write = new PrintWriter(socket.getOutputStream());
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String readline;
        System.out.println("Client:" );
        readline = br.readLine();
        String line=mybc.evaluate(readline);

        // 读取对方的DH公钥
        FileInputStream f1=new FileInputStream(args[0]);
        ObjectInputStream b1=new ObjectInputStream(f1);
        PublicKey  pbk=(PublicKey)b1.readObject( );
        //读取自己的DH私钥
        FileInputStream f2=new FileInputStream(args[1]);
        ObjectInputStream b2=new ObjectInputStream(f2);
        PrivateKey  prk=(PrivateKey)b2.readObject( );
        // 执行密钥协定
        KeyAgreement ka=KeyAgreement.getInstance("DH");
        ka.init(prk);
        ka.doPhase(pbk,true);
        //生成共享信息
        byte[ ] sb=ka.generateSecret();
        System.out.println(sb.length);
        byte[]ssb=new byte[24];
        for(int i=0;i<24;i++)
            ssb[i]=sb[i];
        Key k=new SecretKeySpec(ssb,"DESede");



        Cipher cp=Cipher.getInstance("DESede");
        cp.init(Cipher.ENCRYPT_MODE, k);
        byte ptext[]=line.getBytes("UTF-8");


        byte ctext[]=cp.doFinal(ptext);
        String Str=new String(ctext,"ISO-8859-1");

        write.println(Str);
        write.flush();






        System.out.println("Server return:" + in.readLine());

        write.close();
        in.close();
        socket.close();

    } catch (Exception e) {
        System.out.println("can not listen to:" + e);
    }

}

}

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原文地址：https://www.cnblogs.com/dd1174751354/p/6938890.html

20155331实验五 网络编程与安全

20155331实验五 网络编程与安全

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20155331实验五网络编程与安全

20155331实验五网络编程与安全