rootTmpl := &x509.Certificate{
		SerialNumber:          big.NewInt(1),
		Subject:               pkix.Name{CommonName: "Go test root"},
		IsCA:                  true,
		BasicConstraintsValid: true,
		NotBefore:             time.Now().Add(-time.Hour),
		NotAfter:              time.Now().Add(time.Hour * 10),
	}
	k, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {