Add support for decrypting and saving KeeLoq signals for SubGhzD (#2982)

firmware/application/keeloq_keystore.cpp

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2026 lifegame1lu111
+ *
+ * This file is part of PortaPack.
+ *
+ * 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)
+ * any later version.
+ *
+ * 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; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "keeloq_keystore.hpp"
+
+KeeloqKeystore::KeeloqKeystore() {
+    ensure_directory(keeloq_keys_dir);
+
+    File keeloq_keys_file{};
+
+    if (keeloq_keys_file.open(keeloq_keys_dir / "MFCODES")) {
+        return;
+    }
+
+    FileLineReader reader{keeloq_keys_file};
+
+    for (const std::string& line : reader) {
+        auto cols = split_string(line, ';');
+
+        if (cols.size() != 3) {
+            return;
+        }
+
+        KeeloqKey key{
+            std::string{cols[0]},
+            std::strtoull(cols[1].data(), NULL, 16),
+            (uint8_t)std::atoi(cols[2].data())};
+
+        keys.push_back(key);
+    }
+}
+
+const std::vector<KeeloqKey>& KeeloqKeystore::get_keys() {
+    return keys;
+}