code: public static OpenSslX509KeyManagerFactory newKeyless(X509Certificate... certificateChain)
              throws CertificateException, IOException,
              KeyStoreException, NoSuchAlgorithmException, UnrecoverableKeyException {
          KeyStore store = new OpenSslKeyStore(certificateChain.clone(), true);
          store.load(null, null);
          OpenSslX509KeyManagerFactory factory = new OpenSslX509KeyManagerFactory();
          factory.init(store, null);
          return factory;
      }
docs: Returns a new initialized {@link OpenSslX509KeyManagerFactory} which will provide its private key by using the
  {@link OpenSslPrivateKeyMethod}.