code: func (p *Secring) Contains(fp string) bool {
  	p.Lock()
  	defer p.Unlock()
  
  	for _, pk := range p.data.PrivateKeys {
  		if pk.PublicKey.Fingerprint == fp {
  			return true
  		}
  	}
  	return false
  }
docs: // Contains returns true if the given key is found in the keyring