code: func (p *Secring) KeyIDs() []string {
  	p.Lock()
  	defer p.Unlock()
  
  	ids := make([]string, 0, len(p.data.PrivateKeys))
  	for _, pk := range p.data.PrivateKeys {
  		ids = append(ids, pk.PublicKey.Fingerprint)
  	}
  	sort.Strings(ids)
  	return ids
  }
docs: // KeyIDs returns a list of key IDs