From 4575de680f208fe13833116470664c7252e84bc8 Mon Sep 17 00:00:00 2001
From: Kenmegne <stephanie.kenmegne@gmail.com>
Date: Fri, 19 Jun 2026 11:07:23 +0000
Subject: [PATCH] move to new repo
---
Encryption/src/main/java/com/megatim/module/encryption/impl/AESImpl.java | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 166 insertions(+), 0 deletions(-)
diff --git a/Encryption/src/main/java/com/megatim/module/encryption/impl/AESImpl.java b/Encryption/src/main/java/com/megatim/module/encryption/impl/AESImpl.java
new file mode 100644
index 0000000..f23ade5
--- /dev/null
+++ b/Encryption/src/main/java/com/megatim/module/encryption/impl/AESImpl.java
@@ -0,0 +1,166 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package com.megatim.module.encryption.impl;
+
+import com.megatim.module.encryption.ifaces.EncryptionFace;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.KeySpec;
+import java.util.Base64;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.PBEKeySpec;
+import javax.crypto.spec.SecretKeySpec;
+
+/**
+ *
+ * @author STEPHANIE
+ */
+public class AESImpl implements EncryptionFace {
+
+ private static final String SALT = "hdbgshdbvnc";
+ private static final String HASH_ALGORITHM = "PBKDF2WithHmacSHA256";
+ private static final String ALGORITHM = "AES";
+ private static final int HASH_ITERATIONS = 65536;
+
+ /**
+ * Fonction qui sert à chiffrer
+ *
+ * @param inputPath : chemin vers le fichier à chiffrer
+ * @param keyLength : {128,192,256}
+ * @param outputPath : chemin vers le resutlat du chiffrement
+ * @param password : clé de chiffrement
+ */
+ @Override
+ public void encryptFile(String password, int keyLength, String inputPath, String outputPath) throws Exception {
+ File file = new File(inputPath);
+
+ cryptOrDecryptFile(Cipher.ENCRYPT_MODE, password, keyLength, file, new File(outputPath));
+ }
+
+ /**
+ * Fonction qui sert à déchiffrer
+ *
+ * @param inputPath : chemin du fichier à déchiffrer
+ * @param keyLength
+ * @param outputPath : chemin où stocké le resultat du déchiffrement
+ * @param password : clé de déchiffrement
+ * @throws java.lang.Exception
+ */
+ @Override
+ public void decryptFile(String password, int keyLength, String inputPath, String outputPath) throws Exception {
+ File file = new File(inputPath);
+
+ /* Déchiffre le fichier */
+ cryptOrDecryptFile(Cipher.DECRYPT_MODE, password, keyLength, file,
+ new File(outputPath));
+ }
+
+
+ private void cryptOrDecryptFile(int mode, String password, int keyLength, File inputFile, File outputFile)
+ throws InvalidKeySpecException, NoSuchAlgorithmException, InvalidKeyException,
+ NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, IOException {
+
+ SecretKey secret = getKeyFromPassword(password, SALT, keyLength);
+ /* Utilisation de l'algorithme AES */
+ Cipher aesCipher = Cipher.getInstance(ALGORITHM);
+ aesCipher.init(mode, secret);
+
+ if (!outputFile.exists()) {
+ Files.createFile(outputFile.toPath());
+ }
+
+ FileInputStream inputStream = new FileInputStream(inputFile);
+ FileOutputStream outputStream = new FileOutputStream(outputFile);
+
+ byte[] buffer = new byte[64];
+ int bytesRead;
+
+ while ((bytesRead = inputStream.read(buffer)) != -1) {
+ byte[] output = aesCipher.update(buffer, 0, bytesRead);
+ if (output != null) {
+ outputStream.write(output);
+ }
+ }
+ byte[] outputBytes = aesCipher.doFinal();
+ if (outputBytes != null) {
+ outputStream.write(outputBytes);
+ }
+ inputStream.close();
+ outputStream.close();
+ }
+
+ /**
+ * Méthode servant à générer une clé secrète à partir du mot de passe de
+ * l'utilisateur
+ *
+ * @param password : mot de passe à partir duquel on veut générer la clé
+ * sécrète
+ * @param salt : valeur servant à renforcer la sécurité de la clé sécrète
+ * @param keylength : longueur de la clé en bit
+ * @return
+ * @throws NoSuchAlgorithmException
+ * @throws InvalidKeySpecException
+ */
+ private SecretKey getKeyFromPassword(String password, String salt, int keylength)
+ throws NoSuchAlgorithmException, InvalidKeySpecException {
+
+ SecretKeyFactory factory = SecretKeyFactory.getInstance(HASH_ALGORITHM);
+ KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), HASH_ITERATIONS, keylength);
+ SecretKey secret = new SecretKeySpec(factory.generateSecret(spec)
+ .getEncoded(), ALGORITHM);
+ return secret;
+ }
+
+ @Override
+ public String encryptString(String password, int keyLength, String strToEncrypt) {
+
+ try {
+ SecretKey secret = getKeyFromPassword(password, SALT, keyLength);
+
+ /* Utilisation de l'algorithme AES */
+ Cipher aesCipher = Cipher.getInstance(ALGORITHM);
+ aesCipher.init(Cipher.ENCRYPT_MODE, secret);
+
+ /* Chiffre la chaine de charactères */
+ return Base64.getEncoder().encodeToString(aesCipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8)));
+ } catch (Exception ex) {
+ Logger.getLogger(AESImpl.class.getName()).log(Level.SEVERE, ex.getMessage(), ex);
+ return "";
+ }
+ }
+
+ @Override
+ public String decryptString(String password, int keyLength, String strToDecrypt) {
+
+ try {
+ SecretKey secret = getKeyFromPassword(password, SALT, keyLength);
+
+ /* Utilisation de l'algorithme AES */
+ Cipher aesCipher = Cipher.getInstance(ALGORITHM);
+ aesCipher.init(Cipher.DECRYPT_MODE, secret);
+
+ /* Déchiffre le fichier */
+ return new String(aesCipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
+
+ } catch (Exception ex) {
+ Logger.getLogger(AESImpl.class.getName()).log(Level.SEVERE, ex.getMessage(), ex);
+ return "";
+ }
+ }
+}
--
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