code: func (c *RPCClient) InstallKey(key string) (map[string]string, error) {
  	header := requestHeader{
  		Command: installKeyCommand,
  		Seq:     c.getSeq(),
  	}
  	req := keyRequest{
  		Key: key,
  	}
  
  	resp := keyResponse{}
  	err := c.genericRPC(&header, &req, &resp)
  
  	return resp.Messages, err
  }
docs: // IntallKey installs a new encryption key onto the keyring