public bool Login()
{
var retVal = true;
Android.Content.PM.Permission permissionResult = ContextCompat.CheckSelfPermission(context, Manifest.Permission.UseFingerprint);
if (permissionResult == Android.Content.PM.Permission.Granted)
{
}
else
{
// No permission.
// https://developer.android.com/training/permissions/requesting.html
}
FingerprintManagerCompat fingerprintManager = FingerprintManagerCompat.From(context);
const int flags = 0;
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper();
// cancellationSignal - stop scanning
_cancellationSignal = new Android.Support.V4.OS.CancellationSignal();
fingerprintManager = FingerprintManagerCompat.From(context);
// Callback method
FingerprintManagerCompat.AuthenticationCallback authenticationCallback = new AuthResultsCallback();
// Start scanning
fingerprintManager.Authenticate(cryptoHelper.BuildCryptoObject(), flags, _cancellationSignal, authenticationCallback, null);
return(retVal);
}
public override async Task <SecureFingerprintAuthenticationResult> AuthenticateSecureNoDialogAsync(IAuthenticationFailedListener failedListener, string key, CancellationToken cancellationToken)
{
using (var cancellationSignal = new Android.Support.V4.OS.CancellationSignal())
using (cancellationToken.Register(() => cancellationSignal.Cancel()))
{
CryptoObjectHelper crypto = new CryptoObjectHelper();
var callback = new SecureFingerprintAuthenticationCallback(failedListener, key);
GetServiceCompat().Authenticate(crypto.BuildCryptoObject(), (int)FingerprintAuthenticationFlags.None, cancellationSignal, callback, null);
return(await callback.GetTask());
}
}
public void Authenticate(byte[] secret, FingerprintSignOp operation)
{
const int flags = 0; /* Sempre zero */
if (!IsReady())
{
throw new Exception(Resources.GetString(Resource.String.errFpNotRead));
}
// Estrae l'initialization vector
byte[] iv = new byte[] { };
if (operation == FingerprintSignOp.Decrypt)
{
string data = System.Text.Encoding.UTF8.GetString(secret);
string[] base64Data = data.Split(new char[] { ';' });
if (base64Data.Length < 2)
{
throw new Exception("Invalid data");
}
secret = Convert.FromBase64String(base64Data[0]);
iv = Convert.FromBase64String(base64Data[1]);
}
// Oggetto per la verifica dell'integrità dell'impronta digitale
CurrentOperation = operation;
CryptoObjectHelper cryptoHelper = new CryptoObjectHelper(operation == FingerprintSignOp.Crypt ? CipherMode.EncryptMode : CipherMode.DecryptMode, iv);
// Segnale per la cancellazione manuale della lettura dell'impronta
FingerprintCancel = new Android.Support.V4.OS.CancellationSignal();
// Oggetto per la gestione della callback di autenticazione
FingerprintManagerCompat.AuthenticationCallback authenticationCallback = new FingerprintAuthCallback(this, secret);
// Avvia lo scanner
FingerprintManager.Authenticate(cryptoHelper.BuildCryptoObject(), flags, FingerprintCancel, authenticationCallback, null);
}
