AuthenticatorActivity.kt

/**
 * Save the current form data to the biometric store
 */
private fun saveToBiometricStore(password: String) {
   if (whorlwind?.canStoreSecurely() == true) {
        val disposable = Observable.just(password)
               .observeOn(Schedulers.io())
               .flatMapCompletable {value ->
                    whorlwind?.write("password", ByteString.encodeUtf8(value))
               }
               .subscribe()
        mDisposable.add(disposable)
    } else {
       toast("Biometric storage is not available")
    }
}