code: func (kvp *KvProtoPluginWrapper) NewBroker(prefix string) keyval.ProtoBroker {
  	return NewProtoBrokerWrapper(kvp.KvProtoPlugin.NewBroker(prefix), kvp.decrypter, kvp.decryptFunc)
  }
docs: // NewBroker returns a ProtoBroker instance with support for decrypting values that prepends given <keyPrefix> to all
  // keys in its calls.
  // To avoid using a prefix, pass keyval.Root constant as argument.