code: func (m *Mocker) FindPublicKeys(ctx context.Context, keys ...string) ([]string, error) {
  	rs := staticPrivateKeyList.Recipients()
  	res := make([]string, 0, len(rs))
  	for _, r := range rs {
  		for _, needle := range keys {
  			if strings.HasSuffix(r, needle) {
  				res = append(res, r)
  			}
  		}
  	}
  	return res, nil
  }
docs: // FindPublicKeys does nothing