code: function(data) {
        if (!(data && 'function' === typeof data.isBase64 && data.isBase64())) {
          throw new CError('wrong data format to decrypt').log();
        }
        return JSON.parse(this.encoder.decryptAes(data, this.getSecret()));
      }
docs: Decrypt content.
  
  @param {String} The data to decrypt
  @return {Object} The decrypted result