public override Task <SecureFingerprintAuthenticationResult> NativeSecureAuthenticateAsync(AuthenticationRequestConfiguration authRequestConfig, string key, CancellationToken cancellationToken)
{
TaskCompletionSource <SecureFingerprintAuthenticationResult> response = new TaskCompletionSource <SecureFingerprintAuthenticationResult>();
var securityRecord = new SecRecord(SecKind.GenericPassword)
{
Service = key
};
DispatchQueue.MainQueue.DispatchAsync(() =>
{
SecStatusCode status;
NSData resultData = SecKeyChain.QueryAsData(securityRecord, false, out status);
var result = resultData != null ? new NSString(resultData, NSStringEncoding.UTF8) : "";
var secResponse = new SecureFingerprintAuthenticationResult()
{
ErrorMessage = "",
SecureData = new Dictionary <string, string> {
{ key, result }
},
Status = MapStatus(status)
};
if (status == SecStatusCode.VerifyFailed)
{
//Todo: check if this is the correct status code when a finger print has been added or removed
throw new FingerprintStoreInvalidatedException();
}
});
return(response.Task);
}
private void SetResultSafe(SecureFingerprintAuthenticationResult result)
{
if (!(_taskCompletionSource.Task.IsCanceled || _taskCompletionSource.Task.IsCompleted || _taskCompletionSource.Task.IsFaulted))
{
_taskCompletionSource.SetResult(result);
}
}
// https://developer.android.com/reference/android/hardware/fingerprint/FingerprintManager.AuthenticationCallback.html
public override void OnAuthenticationSucceeded(FingerprintManagerCompat.AuthenticationResult res)
{
base.OnAuthenticationSucceeded(res);
//todo: read the key value from the android keystore
var result = new SecureFingerprintAuthenticationResult {
Status = FingerprintAuthenticationResultStatus.Succeeded
};
SetResultSafe(result);
}
private async void Dismiss(SecureFingerprintAuthenticationResult result, bool animation = true)
{
DetachEventHandlers();
if (animation)
{
HideHelpText();
await AnimateResultAsync(result.Status);
}
_secureResultTaskCompletionSource.TrySetResult(result);
DismissAllowingStateLoss();
}
public override void OnAuthenticationError(int errMsgId, ICharSequence errString)
{
var errorCode = (FingerprintState)errMsgId;
base.OnAuthenticationError(errMsgId, errString);
var message = errString != null?errString.ToString() : string.Empty;
var result = new SecureFingerprintAuthenticationResult {
Status = FingerprintAuthenticationResultStatus.Failed, ErrorMessage = message
};
if (errorCode == FingerprintState.ErrorLockout)
{
result.Status = FingerprintAuthenticationResultStatus.TooManyAttempts;
}
SetResultSafe(result);
}
