}
	// Validate period
	certsphase.CheckCertificatePeriodValidity(kubeadmconstants.CACertAndKeyBaseName, caCert)

	configs, err := getKubeConfigSpecsBase(cfg)
	if err != nil {
		return nil, err
	}
	for _, spec := range configs {
		spec.CACert = caCert
		spec.ClientCertAuth.CAKey = caKey
	}
	return configs, nil
}