Add basic support for WebAuthn (Passkeys) (#8825)

---------

Co-authored-by: varjolintu <sami.vanttinen@protonmail.com>
Co-authored-by: droidmonkey <support@dmapps.us>

tests/TestPasskeys.h

@@ -0,0 +1,47 @@
+/*
+ *  Copyright (C) 2023 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSXC_TESTPASSKEYS_H
+#define KEEPASSXC_TESTPASSKEYS_H
+
+#include <QObject>
+
+#include "browser/BrowserPasskeys.h"
+
+class TestPasskeys : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void initTestCase();
+    void init();
+
+    void testBase64WithHexStrings();
+    void testDecodeResponseData();
+
+    void testLoadingECPrivateKeyFromPem();
+    void testLoadingRSAPrivateKeyFromPem();
+    void testCreatingAttestationObjectWithEC();
+    void testCreatingAttestationObjectWithRSA();
+    void testRegister();
+    void testGet();
+
+    void testExtensions();
+    void testParseFlags();
+    void testSetFlags();
+};
+#endif // KEEPASSXC_TESTPASSKEYS_H