20145325张梓靖 实验五 "JAVA的网络编程"

20145325张梓靖 实验五 "JAVA的网络编程"

实验内容

使用 JVAV语言 进行网络编程

对明文进行加密

设计过程

• 我完成的是客户端，服务端同伴 20145308刘昊阳 地址为：http://www.cnblogs.com/yg961022/p/5471201.html

• 先生成 DES 秘钥

 KeyPairGenerator kpg=KeyPairGenerator.getInstance("RSA");
        kpg.initialize(1024);
        KeyPair kp=kpg.genKeyPair();
        PublicKey pbkey=kp.getPublic();
        PrivateKey prkey=kp.getPrivate();

        FileOutputStream  f1=new FileOutputStream("Skey_RSA_pub.dat");
        ObjectOutputStream b1=new  ObjectOutputStream(f1);
        b1.writeObject(pbkey);

        FileOutputStream  f2=new FileOutputStream("Skey_RSA_priv.dat");
        ObjectOutputStream b2=new  ObjectOutputStream(f2);
        b2.writeObject(prkey);

FileInputStream f=new FileInputStream("key1.dat");
	ObjectInputStream b=new ObjectInputStream(f);
	Key k=(Key)b.readObject( );
        byte[ ] kb=k.getEncoded( );
        FileOutputStream  f2=new FileOutputStream("keykb1.dat");
	   f2.write(kb);
        for(int i=0;i<kb.length;i++){
             System.out.print(kb[i]+",");
        }

• 将输入的明文"Hello World! 20145325"进行加密

	    String s="Hello World! 20145325";

		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[]=s.getBytes("UTF8");
        for(int i=0;i<ptext.length;i++){
            System.out.print(ptext[i]+",");
        }

        System.out.println("");
        byte ctext[]=cp.doFinal(ptext);
        for(int i=0;i<ctext.length;i++){
             System.out.print(ctext[i] +",");
        }

		FileOutputStream f2=new FileOutputStream("SEnc.dat");
        f2.write(ctext);

• 将 DES 的秘钥用服务端的公钥进行 RSA 加密：

FileInputStream f = new FileInputStream("Skey_RSA_pub.dat");
        ObjectInputStream b = new ObjectInputStream(f);
        RSAPublicKey pbk = (RSAPublicKey) b.readObject();
        BigInteger e = pbk.getPublicExponent();
        BigInteger n = pbk.getModulus();
        System.out.println("e= " + e);
        System.out.println("n= " + n);
        byte ptext[] = s.getBytes("UTF8");
        BigInteger m = new BigInteger(ptext);
        BigInteger c = m.modPow(e, n);
        System.out.println("c= " + c);
        String cs = c.toString();
        BufferedWriter out =
                new BufferedWriter(new OutputStreamWriter(
                        new FileOutputStream("Enc_RSA.dat")));
        out.write(cs, 0, cs.length());
        out.close();

• 将密文和加密的秘钥通过网络编程传输过去：

Socket socket = null;
        InputStream is = null;
        OutputStream os = null;
        //服务器端IP地址
        String serverIP = "192.168.199.107";
        //服务器端端口号
        int port = 10000;
        //发送内容
        String data[] ={"**"，"**"};
        try {
            //建立连接
            socket = new Socket(serverIP,port);
            //初始化流
            os = socket.getOutputStream();
            is = socket.getInputStream();
            byte[] b = new byte[1024];
            for(int i = 0;i < data.length;i++){
                //发送数据
                os.write(data[i].getBytes());
                //接收数据
                int n = is.read(b);
                //输出反馈数据
                System.out.println("服务器反馈：" + new String(b,0,n));
            }
        } catch (Exception e) {
            e.printStackTrace(); //打印异常信息
        }finally{
            try {
                //关闭流和连接
                is.close();
                os.close();
                socket.close();
            } catch (Exception e2) {}
        }

• 服务端打开监听，客户端进行传输，服务端收到数据，然后再进行解密