_encrypt34(options) {
    const cipher = crypto.createCipheriv('aes-128-ecb', this.getKey(), null);
    cipher.setAutoPadding(false);
    const encrypted = cipher.update(options.data);
    cipher.final();

    // Default base64 enable TODO: check if this is needed?
    // if (options.base64 === false) {
    //   return Buffer.from(encrypted, 'base64');
    // }

    return encrypted;
  }
Encrypt data for protocol 3.4
@param {Object} options Options for encryption
@param {String} options.data data to encrypt
@param {Boolean} [options.base64=true] `true` to return result in Base64
@returns {Buffer|String} returns Buffer unless options.base64 is true