j46B7R5W

1import java.net.*;
2        import java.io.*;
3        import java.security.InvalidAlgorithmParameterException;
4        import java.security.InvalidKeyException;
5        import java.security.NoSuchAlgorithmException;
6        import javax.crypto.*;
7        import javax.crypto.spec.IvParameterSpec;
8        import javax.crypto.spec.SecretKeySpec;
9
10public class Server{
11    public static void main(String args[]){
12        int number=0;
13        try{
14            int serverPort = 4567;
15            ServerSocket listenSocket = new ServerSocket(serverPort);
16            while(true) {
17                Socket clientSocket = listenSocket.accept();
18                new Connection(clientSocket,number);
19                number++;
20            }
21        } catch(IOException e) {
22            System.out.println("Listen:" + e.getMessage());
23        }
24    }
25}
26
27class Connection extends Thread {
28    DataInputStream in;
29    DataOutputStream out;
30    Socket clientSocket;
31    int number;
32
33    public Connection (Socket aClientSocket,int clientNumber) {
34        try{
35            number=clientNumber;
36            clientSocket = aClientSocket;
37            in = new DataInputStream(clientSocket.getInputStream());
38            out = new DataOutputStream(clientSocket.getOutputStream());
39            this.start();
40        }catch(IOException e){System.out.println("Connection:" + e.getMessage());}
41    }
42
43    public void run(){
44        try{
45            while(true){
46                //key
47                /*KeyGenerator keyGen = KeyGenerator.getInstance("AES");
48                keyGen.init(128);
49                SecretKey secretKey = keyGen.generateKey();*/
50                byte [] key = {1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4};
51                SecretKey secretKey = new SecretKeySpec(key, 0, key.length, "AES");
52
53                //nonce
54                byte[] nonce={1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
55                IvParameterSpec iv = new IvParameterSpec(nonce);
56
57                Cipher c = Cipher.getInstance("AES/CTR/NoPadding");
58                c.init(Cipher.DECRYPT_MODE, secretKey, iv);
59
60                InputStream is = in;
61                CipherInputStream cis = new CipherInputStream(is, c);
62                int text;
63                while((text=cis.read())!=-1) {
64                    System.out.print((char)text);
65                }
66            }
67        }
68        catch (NoSuchPaddingException e) {
69            e.printStackTrace();
70        }
71        catch (NoSuchAlgorithmException e) {
72            e.printStackTrace();
73        }
74        catch (InvalidKeyException e) {
75            e.printStackTrace();
76        }
77        catch (InvalidAlgorithmParameterException e) {
78            e.printStackTrace();
79        }
80        catch (IOException e) {
81            e.printStackTrace();
82        }
83    }
84
85    private void processFile(Cipher c) throws IOException {
86        InputStream is = in;
87        CipherInputStream cis = new CipherInputStream(is, c);
88        int text;
89        while((text=cis.read())!=-1) {
90            System.out.print((char)text);
91        }
92    }
93}