import javax.net.ssl.KeyManager;

static KeyManager keyManagerFromKeyStore(File keystore, char[] passphrase) {
  KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
  temp InputStream keystoreStream = new FileInputStream(javaxSecretDir("keystore.p12"));
  keystore.load(keystoreStream, passphrase);
  KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
  keyManagerFactory.init(keystore, passphrase);
  ret getSingleton(keyManagerFactory.getKeyManagers());
}