w5BnCsX0

1/*
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4 * and open the template in the editor.
5 */
6package des;
7
8import java.io.FileInputStream;
9import java.io.FileNotFoundException;
10import java.io.FileOutputStream;
11import java.io.IOException;
12import java.io.InputStream;
13import java.io.OutputStream;
14import java.util.ArrayList;
15import java.util.Scanner;
16
17import javax.crypto.Cipher;
18import javax.crypto.CipherInputStream;
19import javax.crypto.CipherOutputStream;
20import javax.crypto.SecretKey;
21import javax.crypto.SecretKeyFactory;
22import javax.crypto.spec.DESKeySpec;
23
24public class DES {
25    
26    FileInputStream fis;
27    FileOutputStream fos;
28    static String key = "SofianeArtsitbzzzf";
29    ArrayList<String> text;
30    String f;
31    public DES(String file) throws FileNotFoundException, Throwable{
32        fis = new FileInputStream(file);
33        FileOutputStream fos = new FileOutputStream("C:\\Users\\meder\\Desktop\\9raya\\crypto\\encrypted.txt");
34	encrypt(key, fis, fos);
35
36	FileInputStream fis2 = new FileInputStream("C:\\Users\\meder\\Desktop\\9raya\\crypto\\encrypted.txt");
37	FileOutputStream fos2 = new FileOutputStream("C:\\Users\\meder\\Desktop\\9raya\\crypto\\decrypted.txt");
38	decrypt(key, fis2, fos2);
39        
40    }
41    public static void main(String[] args) throws Throwable {           
42            Scanner scanner = new Scanner( System.in);
43
44            System.out.println("donner moi le chemin absolut du fichier : ");
45            
46            String f = scanner.nextLine();
47            DES d= new DES(f);
48		
49    }
50
51	public static void encrypt(String key, InputStream is, OutputStream os) throws Throwable {
52		encryptOrDecrypt(key, Cipher.ENCRYPT_MODE, is, os);
53	}
54
55	public static void decrypt(String key, InputStream is, OutputStream os) throws Throwable {
56		encryptOrDecrypt(key, Cipher.DECRYPT_MODE, is, os);
57	}
58
59	public static void encryptOrDecrypt(String key, int mode, InputStream is, OutputStream os) throws Throwable {
60
61		DESKeySpec dks = new DESKeySpec(key.getBytes());
62		SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
63		SecretKey desKey = skf.generateSecret(dks);
64		Cipher cipher = Cipher.getInstance("DES"); // DES/ECB/PKCS5Padding for SunJCE
65
66		if (mode == Cipher.ENCRYPT_MODE) {
67			cipher.init(Cipher.ENCRYPT_MODE, desKey);
68			CipherInputStream cis = new CipherInputStream(is, cipher);
69			doCopy(cis, os);
70		} else if (mode == Cipher.DECRYPT_MODE) {
71			cipher.init(Cipher.DECRYPT_MODE, desKey);
72			CipherOutputStream cos = new CipherOutputStream(os, cipher);
73			doCopy(is, cos);
74		}
75	}
76
77	public static void doCopy(InputStream is, OutputStream os) throws IOException {
78		byte[] bytes = new byte[64];
79		int numBytes;
80		while ((numBytes = is.read(bytes)) != -1) {
81			os.write(bytes, 0, numBytes);
82		}
83		os.flush();
84		os.close();
85		is.close();
86	}
87
88}