Bonjour,

J'ai récupéré la classe AESEncryptor de ce forum (http://www.developpez.net/forums/sho...t=13730&page=2)
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
 
/**
 *
 * @author Absil Romain
 */
public class AESEncryptor
{
    /**
     * Generates a secret key for AES encrypting and write it in a file.
     * @param outputFileNamethe file to write the generated key in.
     **/
    public static void generateKey(String outputFileName)
    {
       try
       {
            KeyGenerator keygen = KeyGenerator.getInstance("AES");
            SecureRandom random = new SecureRandom();
            keygen.init(random);
            SecretKey key = keygen.generateKey();
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(outputFileName));
            out.writeObject(key);
            out.close();
       }
       catch(Exception e)
       {
           e.printStackTrace();
       }
    }
 
    /**
     * Encryts or decryts (depends on mode) the file inputFileName, and save 
     * the result in the file outputFileName.
     * @param inputFileName the file to encryt or decrypt.
     * @param outputFileName the file to save the result of encryting or 
     * decrypting.
     * @param ode the mode : encryption (Cipher.ENCRYPT_MODE) or decryption 
     * (Cipher.DECRYPT_MODE).
     * @see javax.crypto.Cipher
     **/
    public static void encryptFile(String inputFileName, String outputFileName, String keyFileName, int mode) 
    {
        InputStream in = null;
        OutputStream out = null;
        try
        {
            ObjectInputStream keyIn = new ObjectInputStream(
                new FileInputStream(keyFileName));
            Key key = (Key)keyIn.readObject();
            keyIn.close();
 
            in = new FileInputStream(inputFileName);
            out = new FileOutputStream(outputFileName);
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(mode, key);
 
            crypt(in, out, cipher);
            in.close();
            out.close();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
 
    private static void crypt(InputStream in, OutputStream out, Cipher cipher)
        throws IOException, GeneralSecurityException
    {
        int blockSize = cipher.getBlockSize();
        int outputSize = cipher.getOutputSize(blockSize);
        byte[] inBytes = new byte[blockSize];
        byte[] outBytes = new byte[outputSize];
 
        int inLength = 0;
        boolean done = false;
        while(!done)
        {
            inLength = in.read(inBytes);
            if(inLength == blockSize)
            {
                int outLength = cipher.update(inBytes, 0, blockSize, outBytes);
                out.write(outBytes, 0, outLength);
            }
            else
                done = true;
        }
 
        if(inLength > 0)
            outBytes = cipher.doFinal(inBytes, 0, inLength);
        else
            outBytes = cipher.doFinal();
 
        out.write(outBytes);
    }
    public static void main(String[] args){
            AESEncryptor.generateKey("key/k.r2o");              
               //AESEncryptor.encryptFile("test/ch10-crypto.pdf","test/newFileAES","key/k.r2o", Cipher.ENCRYPT_MODE);
            AESEncryptor.encryptFile("test/newFileAES", "test/ch10-cryptoN.pdf","key/k.r2o", Cipher.DECRYPT_MODE);
    }            
}
J'arrive à crypter mon fichier (enfin je suppose, puisque je ne peux pas le vérifier) avec :
Code : Sélectionner tout - Visualiser dans une fenêtre à part
AESEncryptor.encryptFile("test/ch10-crypto.pdf","test/newFileAES","key/k.r2o", Cipher.ENCRYPT_MODE);
mais en voulant décrypter avec :
Code : Sélectionner tout - Visualiser dans une fenêtre à part
AESEncryptor.encryptFile("test/newFileAES", "test/ch10-cryptoN.pdf","key/k.r2o", Cipher.DECRYPT_MODE);
j'ai l'exception suivante :
javax.crypto.BadPaddingException: Given final block not properly padded
at com.sun.crypto.provider.SunJCE_h.b(DashoA6275)
at com.sun.crypto.provider.SunJCE_h.b(DashoA6275)
at com.sun.crypto.provider.AESCipher.engineDoFinal(DashoA6275)
at javax.crypto.Cipher.doFinal(DashoA12275)
at AESEncryptor.crypt(AESEncryptor.java:107)
at AESEncryptor.encryptFile(AESEncryptor.java:72)
at AESEncryptor.main(AESEncryptor.java:114)
J'utilise le jdk1.5.0_03.

Merci de votre aide.