code: func validatePrivatePublicKey(l certKeyLocation) error {
  	// Try to load key
  	_, _, err := pkiutil.TryLoadPrivatePublicKeyFromDisk(l.pkiDir, l.baseName)
  	if err != nil {
  		return errors.Wrapf(err, "failure loading key for %s", l.uxName)
  	}
  	return nil
  }
docs: // validatePrivatePublicKey tries to load a private key from pkiDir