zukopvd

class Encryptor(private val sharedPreferences: SharedPreferences) {
    private val ANDROID_KEY_STORE = "AndroidKeyStore"

    private var initVector: ByteArray? = null
    private var encryption: ByteArray? = null
    private val TRANSFORMATION = "AES/GCM/NoPadding"

    @Throws(Exception::class)
    fun encryptTextWithAES(alias: String, textToEncrypt: String): ByteArray? {
        var alias = alias

zukopvd

class Decryptor(private val storage: SharedPreferences) {
    private val ANDROID_KEY_STORE = "AndroidKeyStore"
    private val TRANSFORMATION = "AES/GCM/NoPadding"

    private var keyStore: KeyStore? = null

    init {
        initKeyStore()
    }

zukopvd

val fmanager = FingerprintManagerCompat.from(getApplicationContext())
fmanager.authenticate(cryptoObject, 0, cancellationSignal, authenticationCallback, null)

zukopvd

override fun onAuthenticationError(errorCode: Int, errString: CharSequence?) {
    //scanning completed with unknown error
}

override fun onAuthenticationSucceeded(result: FingerprintManager.AuthenticationResult?) {
    //scanning was successful and has match with one of registered on the device fingerprints
}

override fun onAuthenticationHelp(helpCode: Int, helpString: CharSequence?) {
    //case when scanning was failed because of known reason (limit of scan attempts or dirt on the scanner's sensor).