- Remove the deprecated flags `--csr-only` and `--csr-dir` from `kubeadm certs renew`. Please use `kubeadm certs generate-csr` instead. ([#104796](https://github.com/kubernetes/kubernetes/pull/104796), [@RA489](https://github.com/RA489))

certificates directory as `kubelet-client.key` and `kubelet-client.crt`.  Subsequent certificates created by cert rotation were created in a combined PEM file that was atomically rotated as `kubelet-client-DATE.pem` in that directory, which meant clients relying on the `node.kubeconfig` generated by bootstrapping would never use a rotated cert.  The initial bootstrap certificate is now generated into the cert directory as a PEM file and symlinked to `kubelet-client-current.pem` so that the generated kubeconfig...

   ([#122530](https://github.com/kubernetes/kubernetes/pull/122530), [@neolit123](https://github.com/neolit123))

- kubeadm: introduce deterministic ordering for the certificates generation in the phase command `kubeadm init phase certs`. ([#78556](https://github.com/kubernetes/kubernetes/pull/78556), [@neolit123](https://github.com/neolit123))

- kubeadm: removed the deprecated sub-phase of 'init kubelet-finilize' called `experimental-cert-rotation`, and use 'enable-client-cert-rotation' instead. ([#126913](https://github.com/kubernetes/kubernetes/pull/126913), [@pacoxu](https://github.com/pacoxu)) [SIG Cluster Lifecycle]

  - Some kubeadm commands are now allowed to work in a completely offline mode.
- Certificate handling improvements:
  - Renew certs as part of upgrade.
  - New `kubeadm alpha phase certs renew` command for renewing certificates.
  - Certificates created with kubeadm now have improved uniqueness of Distinguished Name fields.
- HA improvements:

- Kubeadm: allow the `certs check-expiration` command to not require the existence of the cluster CA key (ca.key file) when checking the expiration of managed certificates in kubeconfig files. ([#106854](https://github.com/kubernetes/kubernetes/pull/106854), [@neolit123](https://github.com/neolit123))

- The commands `kubeadm certs renew` and `kubeadm certs check-expiration` now honor the `cert-dir` flag on a running Kubernetes cluster. ([#110709](https://github.com/kubernetes/kubernetes/pull/110709), [@chendave](https://github.com/chendave))

 * limitations under the License.
 */
package okhttp3.tls.internal

import java.io.InputStream
import java.security.KeyStore
import java.security.cert.Certificate
import java.security.cert.X509Certificate
import javax.net.ssl.KeyManagerFactory
import javax.net.ssl.TrustManagerFactory
import javax.net.ssl.X509ExtendedTrustManager
import javax.net.ssl.X509KeyManager

import assertk.assertions.isEqualTo
import assertk.assertions.isFalse
import assertk.assertions.isInstanceOf
import assertk.assertions.isTrue
import java.io.ByteArrayInputStream
import java.security.cert.CertificateFactory
import java.security.cert.X509Certificate
import javax.net.ssl.SSLSession
import javax.security.auth.x500.X500Principal
import okhttp3.FakeSSLSession
import okhttp3.OkHttpClient
import okhttp3.internal.canParseAsIpAddress