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1/*
2 * To change this license header, choose License Headers in Project Properties.
3 * To change this template file, choose Tools | Templates
4 * and open the template in the editor.
5 */
6package ehabshhadat;
7
8import java.io.FileInputStream;
9import java.io.FileNotFoundException;
10import java.io.FileOutputStream;
11import java.io.IOException;
12import java.security.InvalidKeyException;
13import java.security.NoSuchAlgorithmException;
14import java.security.spec.InvalidKeySpecException;
15import javax.crypto.Cipher;
16import javax.crypto.CipherInputStream;
17import javax.crypto.NoSuchPaddingException;
18import javax.crypto.SecretKey;
19import javax.crypto.SecretKeyFactory;
20import javax.crypto.spec.DESKeySpec;
21
22/**
23 *
24 * @author cslab3
25 */
26public class Ehabshhadat {
27
28    /**
29     * @param args the command line arguments
30     */
31    public static void main(String[] args) throws FileNotFoundException, InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IOException {
32        // TODO code application logic here
33        
34        FileInputStream fis=new FileInputStream("ehab.txt");
35        FileOutputStream fos=new FileOutputStream("we.txt");
36        String key=" welcome";
37        DESKeySpec des=new DESKeySpec(key.getBytes());
38        SecretKeyFactory s= SecretKeyFactory.getInstance("DES");
39        SecretKey key1= s.generateSecret(des);
40        
41        
42          
43        Cipher c= Cipher.getInstance("DES");
44        c.init(Cipher.ENCRYPT_MODE,key1);
45        CipherInputStream cin= new CipherInputStream(fis, c);
46        while(true)
47        {
48            int b=cin.read();
49            if(b==-1)
50                break;
51            fos.write(b);        
52        }
53        cin.close();
54        fos.close();
55        
56     
57        FileInputStream is=new FileInputStream("we.txt");
58        FileOutputStream os=new FileOutputStream("ehab1.txt");
59         
60        String key2=" welcome";
61        DESKeySpec des1=new DESKeySpec(key.getBytes());
62        SecretKeyFactory s1= SecretKeyFactory.getInstance("DES");
63        SecretKey key3= s.generateSecret(des);
64        
65        
66          
67          
68        Cipher c1= Cipher.getInstance("DES");
69        c1.init(Cipher.DECRYPT_MODE,key1);
70        CipherInputStream cin1= new CipherInputStream(is, c1);
71         while(true)
72        {
73            int b=cin1.read();
74            if(b==-1)
75                break;
76            os.write(b);        
77        }
78        cin1.close();
79        os.close();
80    
81        
82    }
83    
84}