private void teardown()
void teardown()
  private void teardown()  {    log.entering(this.getClass().getName(), "teardown"); //$NON-NLS-1$    // if we added our own providers remove them    if (gnuCryptoProviderNdx > 0)      ProviderUtil.removeProvider(Registry.GNU_CRYPTO);    if (gnuCallbacksNdx > 0)      ProviderUtil.removeProvider("GNU-CALLBACKS"); //$NON-NLS-1$    log.exiting(this.getClass().getName(), "teardown"); //$NON-NLS-1$  }