}
				return certificate, nil
			}

			reloadCertEvents := make(chan tls.Certificate, 1)
			certificate, err := certs.NewCertificate(env.Get(kms.EnvKESClientCert, ""), env.Get(kms.EnvKESClientKey, ""), loadX509KeyPair)
			if err != nil {
				logger.Fatal(err, "Failed to load KES client certificate")
			}
			certificate.Watch(context.Background(), 15*time.Minute, syscall.SIGHUP)
			certificate.Notify(reloadCertEvents)

credentials via the STS API. It can authenticate via a client certificate and obtain a access/secret key pair as well as a session token. These credentials are associated to an S3 policy at the MinIO server.

In case of certificate-based authentication, MinIO has to map the client-provided certificate to an S3 policy. MinIO does this via the subject common name field of the X.509 certificate. So, MinIO will associate a certificate with a subject `CN = foobar` to a S3 policy named `foobar`....

// password protected.
const EnvCertPassword = "MINIO_CERT_PASSWD"

// ParsePublicCertFile - parses public cert into its *x509.Certificate equivalent.
func ParsePublicCertFile(certFile string) (x509Certs []*x509.Certificate, err error) {
	// Read certificate file.
	var data []byte
	if data, err = os.ReadFile(certFile); err != nil {
		return nil, err
	}

	// Trimming leading and tailing white spaces.

    val certificate =
      HeldCertificate.Builder()
        .keyPair(publicKey, privateKey)
        .build()

    val certificateByteString = certificate.certificate.encoded.toByteString()

    val okHttpCertificate =
      CertificateAdapters.certificate
        .fromDer(certificateByteString)

        peerCertificates = listOf(serverCertificate.certificate, serverIntermediate.certificate),
        localCertificates = listOf(),
      )

    assertThat(handshake.tlsVersion).isEqualTo(TlsVersion.TLS_1_3)
    assertThat(handshake.cipherSuite).isEqualTo(CipherSuite.TLS_AES_128_GCM_SHA256)
    assertThat(handshake.peerCertificates).containsExactly(
      serverCertificate.certificate,
      serverIntermediate.certificate,
    )

    assertThat(listOf(clientCertificate.certificate, clientIntermediate.certificate))
      .isEqualTo(serverHandshake.peerCertificates)
    assertThat(listOf(serverCertificate.certificate, serverIntermediate.certificate))
      .isEqualTo(serverHandshake.localCertificates)
    val clientHandshake = clientHandshakeFuture.get()
    assertThat(listOf(serverCertificate.certificate, serverIntermediate.certificate))

    /**
     * Returns the SHA-256 of `certificate`'s public key.
     *
     * In OkHttp 3.1.2 and earlier, this returned a SHA-1 hash of the public key. Both types are
     * supported, but SHA-256 is preferred.
     */
    @JvmStatic
    fun pin(certificate: Certificate): String {
      require(certificate is X509Certificate) { "Certificate pinning requires X509 certificates" }

```

### 3.2 Use OpenSSL to Generate a Certificate

Use one of the following methods to generate a certificate using `openssl`:

* 3.2.1 [Generate a private key with ECDSA](#generate-private-key-with-ecdsa)
* 3.2.2 [Generate a private key with RSA](#generate-private-key-with-rsa)
* 3.2.3 [Generate a self-signed certificate](#generate-a-self-signed-certificate)

#### 3.2.1 Generate a private key with ECDSA

  //  5. Expiration/certificate lifetime: whether it is fixed by the signer, configurable by the admin.
  //  6. Whether or not requests for CA certificates are allowed.
  optional string signerName = 7;

  // expirationSeconds is the requested duration of validity of the issued
  // certificate. The certificate signer may issue a certificate with a different

    }
  }

  fun verify(
    host: String,
    certificate: X509Certificate,
  ): Boolean {
    return when {
      host.canParseAsIpAddress() -> verifyIpAddress(host, certificate)
      else -> verifyHostname(host, certificate)
    }
  }

  /** Returns true if [certificate] matches [ipAddress]. */
  private fun verifyIpAddress(
    ipAddress: String,
    certificate: X509Certificate,
  ): Boolean {