E0m67pE7

1package encryption;
2
3import java.io.*;
4import java.net.*;
5import java.security.*;
6import javax.crypto.*;
7
8public class CipherClient
9{
10	public static void main(String[] args) throws Exception,NoSuchAlgorithmException,
11                                                  NoSuchPaddingException,
12                                                  BadPaddingException,
13                                                  IllegalBlockSizeException,
14                                                  InvalidKeyException
15	{
16		String message = "The quick brown fox jumps over the lazy dog.";
17		String host = "localhost";
18		int port = 9999;
19		Socket s = new Socket(host, port);
20		
21		// declare cipher variable
22		Cipher desCipher;
23		
24		// generate key
25		KeyGenerator keygen = KeyGenerator.getInstance("DES"); 
26		SecretKey desKey = keygen.generateKey();
27		
28		// create file / place key in file
29		
30		File keyFile = new File("Keyfile.txt");
31		ObjectOutputStream fileTxt = new ObjectOutputStream(new FileOutputStream(keyFile));
32		
33		fileTxt.writeObject(desKey);
34		
35		// send key file
36		
37		ObjectOutputStream fileSocket = new ObjectOutputStream(s.getOutputStream());
38		fileSocket.writeObject(desKey);
39		fileSocket.flush();
40		
41		// create cipher, initialize for encryption
42		desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
43		desCipher.init(Cipher.ENCRYPT_MODE,desKey);
44		
45		// cleartext
46		//byte[] cleartext = message.getBytes();
47		byte cleartext[] = message.getBytes();
48		
49		// encrypt cleartext
50		//byte[] ciphertext = desCipher.doFinal(cleartext);
51		byte ciphertext[] = desCipher.doFinal(cleartext);
52		
53		// send object
54		CipherOutputStream cipherOutput = new CipherOutputStream(s.getOutputStream(),desCipher);
55		
56		cipherOutput.write(ciphertext);	
57		
58		// show cleartext and ciphertext
59		System.out.println(
60				"The cleartext is: "+message
61				+
62				"The ciphertext is: "+ciphertext+"."
63				);
64		
65		//Close all open resources
66		fileTxt.close();
67		cipherOutput.close();
68		s.close();
69		fileSocket.close();
70		
71		
72		
73       /*
74         Cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
75        desCipher.init(Cipher.ENCRYPT_MODE, desKey);
76       */
77
78        //byte[] encryptedMessage = desCipher.doFinal(message);
79        //System.out.println(new String(encryptedMessage));
80
81
82		
83
84		// YOU NEED TO DO THESE STEPS:
85		// -Generate a DES key.
86		// -Store it in a file.
87		// -Use the key to encrypt the message above and send it over socket s to the server.		
88	}
89	
90}