retrieve_token_hive.dart

  Future<String> retrieveUserToken() async {
    try {
      final secureKey = await secureStorage.read(key: SECURE_STORAGE_KEY);
      List<int> encryptionKey = (json.decode(secureKey) as List<dynamic>).cast<int>();
      final encryptedBox = await hive.openBox(BOX_NAME, encryptionKey: encryptionKey);
      String token = encryptedBox.get('token');

      encryptedBox.close();

      return token;
    } catch (e) {
      throw CacheException(message: e.toString());
    }
  }