if err == nil {
			// Validate period
			CheckCertificatePeriodValidity(ca.BaseName, caCert)

			// Cert exists already, make sure it's valid
			if !caCert.IsCA {
				return errors.Errorf("certificate %q is not a CA", ca.Name)
			}
			// Try and load a CA Key
			caKey, err = pkiutil.TryLoadKeyFromDisk(ic.CertificatesDir, ca.BaseName)
			if err != nil {

		BasicConstraintsValid: true,
	}
	if mode&^boringCertFIPSOK == boringCertLeaf {
		tmpl.DNSNames = []string{"example.com"}
	} else {
		tmpl.IsCA = true
		tmpl.KeyUsage |= x509.KeyUsageCertSign
	}

	var pcert *x509.Certificate
	var pkey interface{}
	if parent != nil {
		pcert = parent.cert
		pkey = parent.key
	} else {
		pcert = tmpl

			CommonName: name,
		},
		NotBefore:             time.Unix(1000, 0),
		NotAfter:              time.Unix(2000, 0),
		KeyUsage:              KeyUsageCertSign,
		BasicConstraintsValid: true,
		IsCA:                  true,
	}

	if err := addConstraintsToTemplate(constraints, template); err != nil {
		return nil, err
	}

	if parent == nil {
		parent = template
	}

		cert, err := x509.ParseCertificate(b.Bytes)
		if err != nil {
			allErrors = append(allErrors, field.Invalid(path, "<value omitted>", fmt.Sprintf("entry %d does not parse as X.509", i)))
			continue
		}

		if !cert.IsCA {
			allErrors = append(allErrors, field.Invalid(path, "<value omitted>", fmt.Sprintf("entry %d does not have the CA bit set", i)))
			continue
		}

		if !cert.BasicConstraintsValid {

	if err != nil {
		t.Fatalf("Error while generating key: %v", err)
	}

	template := &x509.Certificate{
		SerialNumber: big.NewInt(0),
		Subject: pkix.Name{
			CommonName: cn,
		},
		IsCA:                  true,
		BasicConstraintsValid: true,
	}

	cert, err := x509.CreateCertificate(rand.Reader, template, template, pub, priv)
	if err != nil {
		t.Fatalf("Error while making certificate: %v", err)

			CommonName: "Root CA 1",
		},
		EncryptionAlgorithm: kubeadmapi.EncryptionAlgorithmRSA2048,
	})
	if err != nil {
		panic(fmt.Sprintf("Failed generating Root CA: %v", err))
	}
	if !rootCACert.IsCA {
		panic("rootCACert is not a valid CA")
	}

	servCert, servKey, err = NewCertAndKey(rootCACert, rootCAKey, &CertConfig{
		Config: certutil.Config{
			CommonName: "kubernetes",

	if err != nil {
		t.Fatalf("Error while generating key: %v", err)
	}

	template := &x509.Certificate{
		SerialNumber: big.NewInt(0),
		Subject: pkix.Name{
			CommonName: cn,
		},
		IsCA:                  true,
		BasicConstraintsValid: true,
	}

	cert, err := x509.CreateCertificate(rand.Reader, template, template, pub, priv)
	if err != nil {
		t.Fatalf("Error while making certificate: %v", err)

	// whether they client has sent exactly one (non-CA) leaf certificate.
	peerCertificates := make([]*x509.Certificate, 0, len(r.TLS.PeerCertificates))
	for _, cert := range r.TLS.PeerCertificates {
		if cert.IsCA {
			continue
		}
		peerCertificates = append(peerCertificates, cert)
	}
	r.TLS.PeerCertificates = peerCertificates

	// Now, we have to check that the client has provided exactly one leaf

	// keyUsage, and a keyUsage containing a flag indicating that the RSA
	// encryption key could only be used for Diffie-Hellman key agreement.

	if certType == intermediateCertificate && (!c.BasicConstraintsValid || !c.IsCA) {
		return CertificateInvalidError{c, NotAuthorizedToSign, ""}
	}

	if c.BasicConstraintsValid && c.MaxPathLen >= 0 {
		numIntermediates := len(currentChain) - 1
		if numIntermediates > c.MaxPathLen {

		if ip := net.ParseIP(h); ip != nil {
			template.IPAddresses = append(template.IPAddresses, ip)
		} else {
			template.DNSNames = append(template.DNSNames, h)
		}
	}

	template.IsCA = true
	template.KeyUsage |= x509.KeyUsageCertSign

	derBytes, err := x509.CreateCertificate(crand.Reader, &template, &template, publicKey(priv), priv)
	if err != nil {