protected override async Task <SecureValueResult> NativeSetSecureValue(SetSecureValueRequestConfiguration setSecureValueRequestConfig, CancellationToken cancellationToken)
{
var currentActivity = CrossFingerprint.CurrentActivity;
var _fingerprintManager = FingerprintManagerCompat.From(currentActivity);
var taskCompletionSource = new TaskCompletionSource <AuthenticationCallbackResult>();
try
{
var sourceValue = System.Text.Encoding.UTF8.GetBytes(setSecureValueRequestConfig.Value);
_fingerprintManager.Authenticate(CryptoObjectHelper.Instance.BuildCryptoObject(CipherMode.EncryptMode),
(int)FingerprintAuthenticationFlags.None,
new CancellationSignal(),
new AuthenticationCallback(sourceValue, taskCompletionSource),
null);
var fragment = CrossFingerprint.CreateSecureValueDialogFragment();
var result = await fragment.ShowAsync(setSecureValueRequestConfig, taskCompletionSource, cancellationToken);
if (result.Status == FingerprintAuthenticationResultStatus.Succeeded)
{
var prefs = Application.Context.GetSharedPreferences(prefsName, FileCreationMode.Private);
var edit = prefs.Edit();
edit.PutString($"{setSecureValueRequestConfig.Key}:iv", Convert.ToBase64String(result.IV));
edit.PutString($"{setSecureValueRequestConfig.Key}:value", Convert.ToBase64String(result.Result));
edit.Commit();
}
return(new SecureValueResult
{
Status = result.Status,
// Pass through error info?
});
}
catch (Exception ex)
{
return(new SecureValueResult
{
Status = FingerprintAuthenticationResultStatus.UnknownError,
ErrorMessage = ex.Message
});
}
}
protected override Task <SecureValueResult> NativeSetSecureValue(SetSecureValueRequestConfiguration setSecureValueRequestConfig, CancellationToken cancellationToken)
{
#if __MAC__
return(Task.FromResult(new SecureValueResult
{
Status = FingerprintAuthenticationResultStatus.NotAvailable,
ErrorMessage = "Not implemented for the current platform."
}));
#else
var key = setSecureValueRequestConfig.Key.ToLower();
var serviceId = setSecureValueRequestConfig.ServiceId.ToLower();
var secureAccessControl = new SecAccessControl(
SecAccessible.WhenPasscodeSetThisDeviceOnly,
SecAccessControlCreateFlags.UserPresence);
if (secureAccessControl == null)
{
return(Task.FromResult(new SecureValueResult
{
Status = FingerprintAuthenticationResultStatus.UnknownError,
ErrorMessage = "Unable to create secure access control object."
}));
}
var statusCode = SecKeyChain.Add(new SecRecord(SecKind.GenericPassword)
{
Service = serviceId,
Label = serviceId,
Account = key,
Generic = NSData.FromString(setSecureValueRequestConfig.Value, NSStringEncoding.UTF8),
UseNoAuthenticationUI = true,
AccessControl = secureAccessControl
});
return(Task.FromResult(new SecureValueResult
{
Status = FingerprintAuthenticationResultStatus.Succeeded,
}));
#endif
}