code: func AuthorizedKeyFingerprint(publicKey []byte) (string, error) {
  	key, _, _, _, err := ssh.ParseAuthorizedKey(publicKey)
  	if err != nil {
  		return "", trace.Wrap(err)
  	}
  	return Fingerprint(key), nil
  }
docs: // AuthorizedKeyFingerprint returns fingerprint from public key
  // in authorized key format