Bonsoir,j'ai un problème au moment de décryptage d'un fichier.voila mon code
package application;

Code : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
 
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
 
import org.apache.commons.codec.binary.Base64;
 
 
public class DecrypBlowfish {
 
    private static String strkey ="Blowfish";
    private static Base64 base64 = new Base64(true);
 
     //encrypt using blowfish algorithm
    public static byte[] encrypt(byte[] Data)throws Exception{
 
        SecretKeySpec key = new SecretKeySpec(strkey.getBytes("UTF8"), "Blowfish");
         Cipher cipher = Cipher.getInstance("Blowfish");
         cipher.init(Cipher.ENCRYPT_MODE, key);
 
         return base64.encode(Data);
 
    }
 
    //decrypt using blow fish algorithm
    public static byte[] decrypt(byte[] encrypted)throws Exception{
        byte[] encryptedData = base64.decodeBase64(encrypted);
         SecretKeySpec key = new SecretKeySpec(strkey.getBytes("UTF8"), "Blowfish");
         Cipher cipher = Cipher.getInstance("Blowfish");
         cipher.init(Cipher.DECRYPT_MODE, key);
         byte[] decrypted = cipher.doFinal(encryptedData);
         return decrypted; 
 
    }
     private static String LireString() {
        String ligne_lue=null; 
try{ 
InputStreamReader lecteur=new InputStreamReader(System.in); 
BufferedReader entree=new BufferedReader(lecteur); 
ligne_lue=entree.readLine(); 
} 
catch(IOException err){ 
System.exit(0); 
} 
return ligne_lue;
    }
 
    public static void main(String[] args) throws Exception {
        String fichier;
System.out.println("Donner le nom du fichier a decrypter:  ");
fichier = LireString();
File f = new File(fichier);
byte[] tab =java.nio.file.Files.readAllBytes(f.toPath());
        byte[] decoded = decrypt(tab);
        FileWriter fw = new FileWriter("bh.txt",true);
        fw.write(new String(decoded));
        fw.close();
    }
}
voila l'exeption
Exception in thread "main" javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:750)
at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:676)
at com.sun.crypto.provider.BlowfishCipher.engineDoFinal(BlowfishCipher.java:319)
at javax.crypto.Cipher.doFinal(Cipher.java:2087)
at application.DecrypBlowfish.decrypt(DecrypBlowfish.java:38)
at application.DecrypBlowfish.main(DecrypBlowfish.java:61)
Pouvez vous m'aider?