/**
   * Creates trust managers using the receiver's trust store configuration.
   *
   * @param context context for status messages
   * @return an array of trust managers or {@code null} if no trust store configuration was provided
   * @throws NoSuchProviderException if a provider specified for one of the trust manager components
   *     is not known to the platform
   * @throws NoSuchAlgorithmException if an algorithm specified for one of the trust manager
   *     components is not known to the relevant provider
   * @throws KeyStoreException if an error occurs in reading a key store containing trust anchors
   */
  private TrustManager[] createTrustManagers(ContextAware context)
      throws NoSuchProviderException, NoSuchAlgorithmException, KeyStoreException {

    if (getTrustStore() == null) return null;

    KeyStore trustStore = getTrustStore().createKeyStore();
    context.addInfo(
        "trust store of type '"
            + trustStore.getType()
            + "' provider '"
            + trustStore.getProvider()
            + "': "
            + getTrustStore().getLocation());

    TrustManagerFactory tmf = getTrustManagerFactory().createTrustManagerFactory();
    context.addInfo(
        "trust manager algorithm '"
            + tmf.getAlgorithm()
            + "' provider '"
            + tmf.getProvider()
            + "'");

    tmf.init(trustStore);
    return tmf.getTrustManagers();
  }