protected override Task <SecureValueResult> NativeRemoveSecureValue(SecureValueRequestConfiguration secureValueRequestConfig, CancellationToken cancellationToken)
{
#if __MAC__
return(Task.FromResult(new SecureValueResult
{
Status = FingerprintAuthenticationResultStatus.NotAvailable,
ErrorMessage = "Not implemented for the current platform."
}));
#else
var key = secureValueRequestConfig.Key.ToLower();
var serviceId = secureValueRequestConfig.ServiceId.ToLower();
var secureRecord = new SecRecord(SecKind.GenericPassword)
{
Service = serviceId,
Label = serviceId,
Account = key,
};
var statusCode = SecKeyChain.Remove(secureRecord);
if (statusCode == SecStatusCode.Success)
{
return(Task.FromResult(new SecureValueResult
{
Status = FingerprintAuthenticationResultStatus.Succeeded,
}));
}
return(Task.FromResult(new SecureValueResult
{
Status = FingerprintAuthenticationResultStatus.UnknownError,
}));
#endif
}
protected override async Task <GetSecureValueResult> NativeGetSecureValue(SecureValueRequestConfiguration secureValueRequestConfig, CancellationToken cancellationToken)
{
var currentActivity = CrossFingerprint.CurrentActivity;
var _fingerprintManager = FingerprintManagerCompat.From(currentActivity);
var taskCompletionSource = new TaskCompletionSource <AuthenticationCallbackResult>();
byte[] iv;
byte[] value;
try
{
var prefs = Application.Context.GetSharedPreferences(prefsName, FileCreationMode.Private);
iv = Convert.FromBase64String(prefs.GetString($"{secureValueRequestConfig.Key}:iv", null));
value = Convert.FromBase64String(prefs.GetString($"{secureValueRequestConfig.Key}:value", null));
}
catch (Exception ex)
{
return(new GetSecureValueResult
{
Status = FingerprintAuthenticationResultStatus.UnknownError,
ErrorMessage = $"No values for {secureValueRequestConfig.Key}"
});
}
try
{
_fingerprintManager.Authenticate(CryptoObjectHelper.Instance.BuildCryptoObject(CipherMode.DecryptMode, iv),
(int)FingerprintAuthenticationFlags.None,
new CancellationSignal(),
new AuthenticationCallback(value, taskCompletionSource),
null);
var fragment = CrossFingerprint.CreateSecureValueDialogFragment();
var result = await fragment.ShowAsync(secureValueRequestConfig, taskCompletionSource, cancellationToken);
if (result.Status == FingerprintAuthenticationResultStatus.Succeeded)
{
return(new GetSecureValueResult
{
Status = result.Status,
Value = System.Text.Encoding.UTF8.GetString(result.Result),
});
}
return(new GetSecureValueResult
{
Status = result.Status,
// Pass through error info?
});
}
catch (Exception ex)
{
return(new GetSecureValueResult
{
Status = FingerprintAuthenticationResultStatus.UnknownError,
ErrorMessage = ex.Message
});
}
}
protected override Task <GetSecureValueResult> NativeGetSecureValue(SecureValueRequestConfiguration secureValueRequestConfig, CancellationToken cancellationToken)
{
return(Task.FromResult(new GetSecureValueResult
{
Status = FingerprintAuthenticationResultStatus.NotAvailable,
ErrorMessage = "Not implemented for the current platform."
}));
}
protected override Task <GetSecureValueResult> NativeGetSecureValue(SecureValueRequestConfiguration secureValueRequestConfig, CancellationToken cancellationToken)
{
#if __MAC__
return(Task.FromResult(new GetSecureValueResult
{
Status = FingerprintAuthenticationResultStatus.NotAvailable,
ErrorMessage = "Not implemented for the current platform."
}));
#else
var key = secureValueRequestConfig.Key.ToLower();
var serviceId = secureValueRequestConfig.ServiceId.ToLower();
var secureRecord = new SecRecord(SecKind.GenericPassword)
{
Service = serviceId,
Label = serviceId,
Account = key,
UseOperationPrompt = secureValueRequestConfig.Reason
};
SecStatusCode statusCode;
secureRecord = SecKeyChain.QueryAsRecord(secureRecord, out statusCode);
if (statusCode == SecStatusCode.Success && secureRecord != null && secureRecord.Generic != null)
{
return(Task.FromResult(new GetSecureValueResult
{
Status = FingerprintAuthenticationResultStatus.Succeeded,
Value = NSString.FromData(secureRecord.Generic, NSStringEncoding.UTF8)
}));
}
if (statusCode == SecStatusCode.UserCanceled)
{
return(Task.FromResult(new GetSecureValueResult
{
Status = FingerprintAuthenticationResultStatus.Cancelled,
}));
}
return(Task.FromResult(new GetSecureValueResult
{
Status = FingerprintAuthenticationResultStatus.UnknownError,
ErrorMessage = statusCode.ToString()
}));
#endif
}
protected override Task <SecureValueResult> NativeRemoveSecureValue(SecureValueRequestConfiguration secureValueRequestConfig, CancellationToken cancellationToken)
{
try
{
var prefs = Application.Context.GetSharedPreferences(prefsName, FileCreationMode.Private);
var edit = prefs.Edit();
edit.Remove($"{secureValueRequestConfig.Key}:iv");
edit.Remove($"{secureValueRequestConfig.Key}:value");
edit.Commit();
return(Task.FromResult(new SecureValueResult
{
Status = FingerprintAuthenticationResultStatus.Succeeded,
}));
}
catch (Exception ex)
{
return(Task.FromResult(new SecureValueResult
{
Status = FingerprintAuthenticationResultStatus.UnknownError,
ErrorMessage = ex.Message,
}));
}
}
