select {
		case resultCh <- ci:
		case <-ctx.Done():
			return
		}
	}()

	select {
	case <-ctx.Done():
		return nil
	case ci := <-resultCh:
		out, err := json.MarshalIndent(ci, "", "  ")
		if err != nil {
			bugLogIf(ctx, err)
			return nil
		}
		return out
	}
}

func bytesToPublicKey(pub []byte) (*rsa.PublicKey, error) {
	block, _ := pem.Decode(pub)