throws GeneralSecurityException, IOException {
    KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
    try (InputStream in = new FileInputStream(keystoreFile)) {
      keystore.load(in, password.toCharArray());
    }
    KeyManagerFactory keyManagerFactory =
        KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
    keyManagerFactory.init(keystore, password.toCharArray());

  @Throws(SignatureException::class)
  fun checkSignature(issuer: PublicKey): Boolean {
    val signedData = CertificateAdapters.tbsCertificate.toDer(tbsCertificate)

    return Signature.getInstance(tbsCertificate.signatureAlgorithmName).run {
      initVerify(issuer)
      update(signedData.toByteArray())
      verify(signatureValue.byteString.toByteArray())
    }
  }

  private val provider: Provider = BouncyCastleJsseProvider()

  override fun newSSLContext(): SSLContext = SSLContext.getInstance("TLS", provider)

  override fun platformTrustManager(): X509TrustManager {
    val factory =
      TrustManagerFactory.getInstance(
        "PKIX",
        BouncyCastleJsseProvider.PROVIDER_NAME,
      )
    factory.init(null as KeyStore?)

      )

    val keyManagerFactory = KeyManagerFactory.getInstance("NewSunX509")
    keyManagerFactory.init(KeyStoreBuilderParameters(builderList))
    val keyManager = keyManagerFactory.keyManagers[0] as X509ExtendedKeyManager

    val trustManager = Platform.get().platformTrustManager()

    val sslContext = SSLContext.getInstance("TLS")
    sslContext.init(arrayOf(keyManager), arrayOf(trustManager), SecureRandom())

  // defaulted versions for TLS based on what is requested.
  override fun newSSLContext(): SSLContext = SSLContext.getInstance("TLSv1.3", provider)

  override fun platformTrustManager(): X509TrustManager {
    val factory =
      TrustManagerFactory.getInstance(
        TrustManagerFactory.getDefaultAlgorithm(),
        provider,
      )
    factory.init(null as KeyStore?)

   * certificates.
   */
  private SSLSocketFactory defaultSslSocketFactory(X509TrustManager trustManager)
      throws NoSuchAlgorithmException, KeyManagementException {
    SSLContext sslContext = SSLContext.getInstance("TLS");
    sslContext.init(null, new TrustManager[] { trustManager }, null);

    return sslContext.getSocketFactory();
  }

  /** Returns a trust manager that trusts the VM's default certificate authorities. */

        val keyStoreFactory = KeyStoreFactory(Configuration.configuration(), MockServerLogger())

        val socketFactory = keyStoreFactory.sslContext().socketFactory

        val trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm())
        trustManagerFactory.init(keyStoreFactory.loadOrCreateKeyStore())
        val trustManager = trustManagerFactory.trustManagers.first() as X509TrustManager

    callback: DnsResolver.Callback<List<InetAddress>>,
  ) {
    responder(Request(network, domain, nsType, flags, callback))
  }

  companion object {
    @Implementation
    @JvmStatic
    fun getInstance(): DnsResolver = Shadow.newInstance(DnsResolver::class.java, arrayOf(), arrayOf())
  }

  // for version differences
  override fun newSSLContext(): SSLContext =
    // supports TLSv1.3 by default (version api is >= 1.4.0)
    SSLContext.getInstance("TLS", provider)

  override fun platformTrustManager(): X509TrustManager {
    val trustManagers =
      TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm()).apply {
        init(null as KeyStore?)
      }.trustManagers!!

      super.logCloseableLeak(message, stackTrace)
    }
  }

  @SuppressLint("NewApi")
  override fun isCleartextTrafficPermitted(hostname: String): Boolean =
    NetworkSecurityPolicy.getInstance().isCleartextTrafficPermitted(hostname)

  override fun buildCertificateChainCleaner(trustManager: X509TrustManager): CertificateChainCleaner =