Method encrypt

PasswordManagerGUI.java:107–131

(String masterPassword, String password)

    }

    private String encrypt(String masterPassword, String password) {
        try {
            byte[] salt = generateSalt();
            SecretKey key = deriveKey(masterPassword.toCharArray(), salt);
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            byte[] iv = new byte[IV_LENGTH];
            new SecureRandom().nextBytes(iv);
            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
            cipher.init(Cipher.ENCRYPT_MODE, key, ivParameterSpec);
            byte[] encrypted = cipher.doFinal(password.getBytes());
            byte[] combined = new byte[salt.length + iv.length + encrypted.length];
            System.arraycopy(salt, 0, combined, 0, salt.length);
            System.arraycopy(iv, 0, combined, salt.length, iv.length);
            System.arraycopy(encrypted, 0, combined, salt.length + iv.length, encrypted.length);
            String encryptedPassword = Base64.getEncoder().encodeToString(combined);

            // Write encrypted password to file
            writeToFile(encryptedPassword);

            return encryptedPassword;
        } catch (Exception e) {
            JOptionPane.showMessageDialog(this, "Encryption failed: " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
            return null;
        }
    }

    private void writeToFile(String encryptedPassword) {
        try (BufferedWriter writer = new BufferedWriter(new FileWriter(ENCRYPTED_PASSWORD_FILE))) {