private async void ScanQRCode()
{
var options = new MobileBarcodeScanningOptions {
PossibleFormats = new List <BarcodeFormat> {
BarcodeFormat.QR_CODE
}
};
var result = await _barcodeScanner.Scan(options);
if (result == null)
{
return;
}
try
{
var auth = Authenticator.FromKeyUri(result.Text);
if (_authSource.IsDuplicate(auth))
{
Toast.MakeText(this, Resource.String.duplicateAuthenticator, ToastLength.Short).Show();
return;
}
await _connection.InsertAsync(auth);
await _authSource.UpdateSource();
CheckEmptyState();
_authAdapter.NotifyItemInserted(_authSource.GetPosition(auth.Secret));
}
catch
{
Toast.MakeText(this, Resource.String.qrCodeFormatError, ToastLength.Short).Show();
}
}
private async Task Restore(string password = "")
{
try
{
string contents;
if (String.IsNullOrEmpty(password))
{
contents = Encoding.UTF8.GetString(_fileData);
}
else
{
var sha256 = SHA256.Create();
var passwordBytes = Encoding.UTF8.GetBytes(password);
var keyMaterial = sha256.ComputeHash(passwordBytes);
var provider =
WinRTCrypto.SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
var key = provider.CreateSymmetricKey(keyMaterial);
var raw = WinRTCrypto.CryptographicEngine.Decrypt(key, _fileData);
contents = Encoding.UTF8.GetString(raw);
_dialog.Dismiss();
}
var backup = JsonConvert.DeserializeObject <Backup>(contents);
if (backup.Authenticators == null)
{
Toast.MakeText(this, Resource.String.invalidFileError, ToastLength.Short).Show();
return;
}
var authsInserted = 0;
var categoriesInserted = 0;
foreach (var auth in backup.Authenticators.Where(auth => !_authSource.IsDuplicate(auth)))
{
await _connection.InsertAsync(auth);
authsInserted++;
}
foreach (var category in backup.Categories.Where(category => !_categorySource.IsDuplicate(category)))
{
await _connection.InsertAsync(category);
categoriesInserted++;
}
foreach (var binding in backup.AuthenticatorCategories.Where(binding => !_authSource.IsDuplicateCategoryBinding(binding)))
{
await _connection.InsertAsync(binding);
}
var message = String.Format(GetString(Resource.String.restoredFromBackup), authsInserted,
categoriesInserted);
Toast.MakeText(this, message, ToastLength.Long).Show();
Finish();
}
catch
{
_dialog.Error = GetString(Resource.String.restoreError);
}
}