public override bool Init()
{
Kp2aLog.Log("FP: Init for Dec");
try
{
_keystore.Load(null);
var key = _keystore.GetKey(GetAlias(_keyId), null);
var ivParams = new IvParameterSpec(_iv);
_cipher.Init(CipherMode.DecryptMode, key, ivParams);
_cryptoObject = new BiometricPrompt.CryptoObject(_cipher);
return(true);
}
catch (KeyPermanentlyInvalidatedException e)
{
Kp2aLog.Log("FP: KeyPermanentlyInvalidatedException." + e.ToString());
return(false);
}
catch (KeyStoreException e)
{
throw new RuntimeException(FailedToInitCipher, e);
}
catch (CertificateException e)
{
throw new RuntimeException(FailedToInitCipher, e);
}
catch (UnrecoverableKeyException e)
{
throw new RuntimeException(FailedToInitCipher, e);
}
catch (IOException e)
{
throw new RuntimeException(FailedToInitCipher, e);
}
catch (NoSuchAlgorithmException e)
{
throw new RuntimeException(FailedToInitCipher, e);
}
catch (InvalidKeyException e)
{
throw new RuntimeException(FailedToInitCipher, e);
}
}
public override bool Init()
{
Kp2aLog.Log("FP: Init for Dec");
try
{
_keystore.Load(null);
var aliases = _keystore.Aliases();
if (aliases == null)
{
Kp2aLog.Log("KS: no aliases");
}
else
{
while (aliases.HasMoreElements)
{
var o = aliases.NextElement();
Kp2aLog.Log("alias: " + o?.ToString());
}
Kp2aLog.Log("KS: end aliases");
}
var key = _keystore.GetKey(GetAlias(_keyId), null);
if (key == null)
{
throw new Exception("Failed to init cipher for fingerprint Init: key is null");
}
var ivParams = new IvParameterSpec(_iv);
_cipher.Init(CipherMode.DecryptMode, key, ivParams);
_cryptoObject = new BiometricPrompt.CryptoObject(_cipher);
return(true);
}
catch (KeyPermanentlyInvalidatedException e)
{
Kp2aLog.Log("FP: KeyPermanentlyInvalidatedException." + e.ToString());
return(false);
}
catch (KeyStoreException e)
{
throw new RuntimeException(FailedToInitCipher + " (keystore)", e);
}
catch (CertificateException e)
{
throw new RuntimeException(FailedToInitCipher + " (CertificateException)", e);
}
catch (UnrecoverableKeyException e)
{
throw new RuntimeException(FailedToInitCipher + " (UnrecoverableKeyException)", e);
}
catch (IOException e)
{
throw new RuntimeException(FailedToInitCipher + " (IOException)", e);
}
catch (NoSuchAlgorithmException e)
{
throw new RuntimeException(FailedToInitCipher + " (NoSuchAlgorithmException)", e);
}
catch (InvalidKeyException e)
{
throw new RuntimeException(FailedToInitCipher + " (InvalidKeyException)" + e.ToString(), e);
}
}
private async Task <BiometricPrompt.AuthenticationResult> AuthenticateAndProcess(CancellationToken ct, string keyName, BiometricPrompt.CryptoObject crypto = null)
{
if (this.Log().IsEnabled(LogLevel.Debug))
{
this.Log().Debug($"Authenticating and processing the fingerprint (key name: '{keyName}').");
}
int result = 0;
if (Android.OS.Build.VERSION.SdkInt <= Android.OS.BuildVersionCodes.Q)
{
result = _biometricManager.CanAuthenticate();
}
else
{
result = _biometricManager.CanAuthenticate(BiometricManager.Authenticators.BiometricStrong);
}
if (result == BiometricManager.BiometricSuccess)
{
_authenticationCompletionSource = new TaskCompletionSource <BiometricPrompt.AuthenticationResult>();
// Prepare and show UI
var prompt = await _promptInfoBuilder(ct);
await _dispatcher.RunAsync(CoreDispatcherPriority.High, () =>
{
try
{
if (crypto == null)
{
_biometricPrompt.Authenticate(prompt);
}
else
{
_biometricPrompt.Authenticate(prompt, crypto);
}
}
catch (System.Exception e)
{
_authenticationCompletionSource.TrySetException(e);
}
});
var authenticationTask = _authenticationCompletionSource.Task;
await Task.WhenAny(authenticationTask);
if (authenticationTask.IsCompletedSuccessfully && this.Log().IsEnabled(LogLevel.Information))
{
this.Log().Info($"Successfully authenticated and processed the fingerprint (key name: '{keyName}').");
}
if (authenticationTask.IsCanceled)
{
throw new OperationCanceledException();
}
return(authenticationTask.Result);
}
else
{
if (result == BiometricManager.BiometricErrorNoneEnrolled)
{
throw new InvalidOperationException("No fingerprint(s) registered.");
}
else
{
if (this.Log().IsEnabled(LogLevel.Warning))
{
this.Log().Warn($"Fingerprint authentication is not available.");
}
throw new NotSupportedException("Fingerprint authentication is not available.");
}
}
}
