/*
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* Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
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* Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
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*/
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package com.megatim.module.encryption.impl;
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import com.megatim.module.encryption.ifaces.EncryptionFace;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.KeySpec;
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import java.util.Base64;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.SecretKey;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.PBEKeySpec;
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import javax.crypto.spec.SecretKeySpec;
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/**
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*
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* @author STEPHANIE
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*/
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public class AESImpl implements EncryptionFace {
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private static final String SALT = "hdbgshdbvnc";
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private static final String HASH_ALGORITHM = "PBKDF2WithHmacSHA256";
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private static final String ALGORITHM = "AES";
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private static final int HASH_ITERATIONS = 65536;
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/**
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* Fonction qui sert à chiffrer
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*
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* @param inputPath : chemin vers le fichier à chiffrer
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* @param keyLength : {128,192,256}
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* @param outputPath : chemin vers le resutlat du chiffrement
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* @param password : clé de chiffrement
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*/
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@Override
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public void encryptFile(String password, int keyLength, String inputPath, String outputPath) throws Exception {
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File file = new File(inputPath);
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cryptOrDecryptFile(Cipher.ENCRYPT_MODE, password, keyLength, file, new File(outputPath));
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}
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/**
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* Fonction qui sert à déchiffrer
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*
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* @param inputPath : chemin du fichier à déchiffrer
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* @param keyLength
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* @param outputPath : chemin où stocké le resultat du déchiffrement
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* @param password : clé de déchiffrement
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* @throws java.lang.Exception
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*/
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@Override
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public void decryptFile(String password, int keyLength, String inputPath, String outputPath) throws Exception {
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File file = new File(inputPath);
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/* Déchiffre le fichier */
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cryptOrDecryptFile(Cipher.DECRYPT_MODE, password, keyLength, file,
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new File(outputPath));
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}
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private void cryptOrDecryptFile(int mode, String password, int keyLength, File inputFile, File outputFile)
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throws InvalidKeySpecException, NoSuchAlgorithmException, InvalidKeyException,
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NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, IOException {
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SecretKey secret = getKeyFromPassword(password, SALT, keyLength);
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/* Utilisation de l'algorithme AES */
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Cipher aesCipher = Cipher.getInstance(ALGORITHM);
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aesCipher.init(mode, secret);
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if (!outputFile.exists()) {
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Files.createFile(outputFile.toPath());
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}
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FileInputStream inputStream = new FileInputStream(inputFile);
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FileOutputStream outputStream = new FileOutputStream(outputFile);
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byte[] buffer = new byte[64];
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int bytesRead;
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while ((bytesRead = inputStream.read(buffer)) != -1) {
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byte[] output = aesCipher.update(buffer, 0, bytesRead);
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if (output != null) {
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outputStream.write(output);
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}
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}
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byte[] outputBytes = aesCipher.doFinal();
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if (outputBytes != null) {
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outputStream.write(outputBytes);
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}
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inputStream.close();
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outputStream.close();
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}
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/**
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* Méthode servant à générer une clé secrète à partir du mot de passe de
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* l'utilisateur
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*
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* @param password : mot de passe à partir duquel on veut générer la clé
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* sécrète
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* @param salt : valeur servant à renforcer la sécurité de la clé sécrète
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* @param keylength : longueur de la clé en bit
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* @return
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* @throws NoSuchAlgorithmException
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* @throws InvalidKeySpecException
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*/
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private SecretKey getKeyFromPassword(String password, String salt, int keylength)
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throws NoSuchAlgorithmException, InvalidKeySpecException {
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SecretKeyFactory factory = SecretKeyFactory.getInstance(HASH_ALGORITHM);
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KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), HASH_ITERATIONS, keylength);
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SecretKey secret = new SecretKeySpec(factory.generateSecret(spec)
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.getEncoded(), ALGORITHM);
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return secret;
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}
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@Override
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public String encryptString(String password, int keyLength, String strToEncrypt) {
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try {
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SecretKey secret = getKeyFromPassword(password, SALT, keyLength);
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/* Utilisation de l'algorithme AES */
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Cipher aesCipher = Cipher.getInstance(ALGORITHM);
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aesCipher.init(Cipher.ENCRYPT_MODE, secret);
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/* Chiffre la chaine de charactères */
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return Base64.getEncoder().encodeToString(aesCipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8)));
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} catch (Exception ex) {
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Logger.getLogger(AESImpl.class.getName()).log(Level.SEVERE, ex.getMessage(), ex);
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return "";
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}
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}
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@Override
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public String decryptString(String password, int keyLength, String strToDecrypt) {
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try {
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SecretKey secret = getKeyFromPassword(password, SALT, keyLength);
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/* Utilisation de l'algorithme AES */
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Cipher aesCipher = Cipher.getInstance(ALGORITHM);
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aesCipher.init(Cipher.DECRYPT_MODE, secret);
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/* Déchiffre le fichier */
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return new String(aesCipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
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} catch (Exception ex) {
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Logger.getLogger(AESImpl.class.getName()).log(Level.SEVERE, ex.getMessage(), ex);
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return "";
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}
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}
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}
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