// expirationSeconds is the requested duration of validity of the issued
  // certificate. The certificate signer may issue a certificate with a different
  // validity duration so a client must check the delta between the notBefore and
  // and notAfter fields in the issued certificate to determine the actual duration.
  //
  // The v1.22+ in-tree implementations of the well-known Kubernetes signers will

  // expirationSeconds is the requested duration of validity of the issued
  // certificate. The certificate signer may issue a certificate with a different
  // validity duration so a client must check the delta between the notBefore and
  // and notAfter fields in the issued certificate to determine the actual duration.
  //
  // The v1.22+ in-tree implementations of the well-known Kubernetes signers will

	// expirationSeconds is the requested duration of validity of the issued
	// certificate. The certificate signer may issue a certificate with a different
	// validity duration so a client must check the delta between the notBefore and
	// and notAfter fields in the issued certificate to determine the actual duration.
	//
	// The v1.22+ in-tree implementations of the well-known Kubernetes signers will

	// should be
	if k.creationTime.IsZero() {
		k.creationTime = kubeadmutil.StartTimeUTC()
	}

	// Backdate certificate to allow small time jumps.
	k.config.NotBefore = k.creationTime.Add(-kubeadmconstants.CertificateBackdate)

	// Use the validity periods defined in the ClusterConfiguration.
	// If CAName is empty this is a CA cert.
	if len(k.CAName) != 0 {

	if err != nil {
		return err
	}
	now := time.Now()
	for _, cert := range certs {
		// check if the certificate has expired
		if now.After(cert.NotAfter) || now.Before(cert.NotBefore) {
			return fmt.Errorf("certificate is expired or not yet valid")
		}
	}
	return nil
}

func recordInvalidCertificate(name string, err error) {
	pilotSDSCertificateErrors.Increment()

	var serialBytes [16]byte
	rand.Read(serialBytes[:])

	template := &Certificate{
		SerialNumber: new(big.Int).SetBytes(serialBytes[:]),
		Subject: pkix.Name{
			CommonName: name,
		},
		NotBefore:             time.Unix(1000, 0),
		NotAfter:              time.Unix(2000, 0),
		KeyUsage:              KeyUsageCertSign,
		BasicConstraintsValid: true,
		IsCA:                  true,
	}

		org = org[:i]
		parentOrg = name[i+1:]
	}
	tmpl := &x509.Certificate{
		SerialNumber: big.NewInt(1),
		Subject: pkix.Name{
			Organization: []string{org},
		},
		NotBefore: time.Unix(0, 0),
		NotAfter:  time.Unix(0, 0),

		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,

		}
	}

	now := opts.CurrentTime
	if now.IsZero() {
		now = time.Now()
	}
	if now.Before(c.NotBefore) {
		return CertificateInvalidError{
			Cert:   c,
			Reason: Expired,
			Detail: fmt.Sprintf("current time %s is before %s", now.Format(time.RFC3339), c.NotBefore.Format(time.RFC3339)),
		}
	} else if now.After(c.NotAfter) {
		return CertificateInvalidError{
			Cert:   c,

	ManifestsSubDirName = "manifests"
	// TempDirForKubeadm defines temporary directory for kubeadm
	// should be joined with KubernetesDir.
	TempDirForKubeadm = "tmp"

	// CertificateBackdate defines the offset applied to notBefore for CA certificates generated by kubeadm
	CertificateBackdate = time.Minute * 5
	// CertificateValidityPeriod defines the validity period for all the signed certificates generated by kubeadm