code: func (k *Keyring) GenerateBoxKey() (*SecretKey, error) {
  	ret, err := generateBoxKey()
  	if err != nil {
  		return nil, err
  	}
  	k.encKeys[ret.pub] = *ret
  	return ret, nil
  }
docs: // GenerateBoxKey generates a new Box secret key and imports it into the keyring.