HpYNn50E

1package tp.jce;
2
3import java.io.BufferedInputStream;
4import java.io.ByteArrayOutputStream;
5import java.io.FileInputStream;
6import java.security.KeyPair;
7import java.security.KeyPairGenerator;
8import java.security.NoSuchAlgorithmException;
9import java.security.PrivateKey;
10import java.security.Signature;
11
12import javax.crypto.Cipher;
13import javax.crypto.KeyGenerator;
14import javax.crypto.NoSuchPaddingException;
15import javax.crypto.SecretKey;
16
17public class MainClass {
18
19	
20	public static void main(String[] args) {
21		
22		try {
23			
24			
25			//pair de cle public prive
26			
27			KeyPairGenerator key = KeyPairGenerator.getInstance("RSA");
28			KeyPair kp = key.generateKeyPair();
29			
30			//Generation du cle secrect pour chiffrer
31			
32			KeyGenerator generator =KeyGenerator.getInstance("AES");
33			SecretKey secretKey = generator.generateKey();
34			
35			byte[] signature =signer("file.txt",kp.getPrivate())  ;
36			
37			System.out.println(new String(signature));
38			
39			
40			byte[] crypt =crpytFile("file.txt",secretKey)  ;
41			
42			System.out.println("-------------------------------------");
43			System.out.println(new String(crypt));
44
45			
46			
47		
48		} catch (Exception e) {
49			// TODO Auto-generated catch block
50			e.printStackTrace();
51		}
52		
53		
54		
55	}
56
57	private static byte[] crpytFile(String string, SecretKey secretKey) throws Exception {
58
59		
60		Cipher cipher = Cipher.getInstance("AES");
61		
62		cipher.init(Cipher.ENCRYPT_MODE, secretKey);
63
64		BufferedInputStream bis = new BufferedInputStream(new FileInputStream(string));
65
66		byte[] buff = new byte[1024];
67		byte[] res = new byte[1024];
68		ByteArrayOutputStream stream = new ByteArrayOutputStream();
69		
70		while (bis.available()!=0) {
71				bis.read(buff);
72				stream.write(cipher.update(buff));
73				stream.write(res);
74		}
75		bis.read(buff);
76		res=cipher.doFinal(buff);
77		stream.write(res);
78		bis.close();
79	
80		return stream.toByteArray();
81	}
82
83	private static byte[] signer(String string, PrivateKey private1) throws Exception {
84
85		Signature s = Signature.getInstance("MD5withRSA");
86		
87		s.initSign(private1);
88		
89		BufferedInputStream bis = new BufferedInputStream(new FileInputStream(string));
90		
91		byte[] buff = new byte[1024];
92		
93		while (bis.available()!=0) {
94				bis.read(buff);
95				s.update(buff);
96		}
97		
98		return s.sign();
99	}
100}