[settings] Add back & properly implement use_dev_keys (#3631)

Was removed recently but also wasn't really working before, this adds it to the debug UI (under the kiosk option) and also makes it properly reload the keys on launch & setting change.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3631
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: smiRaphi <neogt404@gmail.com>
Co-committed-by: smiRaphi <neogt404@gmail.com>

src/common/settings.h

@@ -777,6 +777,7 @@ struct Values {
     Setting<bool> reporting_services{
                                      linkage, false, "reporting_services", Category::Debugging, Specialization::Default, false};
     Setting<bool> quest_flag{linkage, false, "quest_flag", Category::Debugging};
+    Setting<bool> use_dev_keys{linkage, false, "use_dev_keys", Category::Debugging};
     Setting<bool> disable_macro_jit{linkage, false, "disable_macro_jit",
                                     Category::DebuggingGraphics};
     Setting<bool> disable_macro_hle{linkage, false, "disable_macro_hle",

src/core/crypto/key_manager.cpp

@@ -21,6 +21,7 @@
 #include "common/fs/path_util.h"
 #include "common/hex_util.h"
 #include "common/logging/log.h"
+#include "common/settings.h"
 #include "common/string_util.h"
 #include "core/crypto/aes_util.h"
 #include "core/crypto/key_manager.h"
@@ -642,8 +643,15 @@ void KeyManager::ReloadKeys() {
     const auto keys_dir = Common::FS::GetEdenPath(Common::FS::EdenPath::KeysDir);
     if (!Common::FS::CreateDir(keys_dir))
         LOG_ERROR(Core, "Failed to create the keys directory.");
-    LoadFromFile(keys_dir / "prod.keys_autogenerated", false);
-    LoadFromFile(keys_dir / "prod.keys", false);
+    if (Settings::values.use_dev_keys.GetValue()) {
+        dev_mode = true;
+        LoadFromFile(keys_dir / "dev.keys_autogenerated", false);
+        LoadFromFile(keys_dir / "dev.keys", false);
+    } else {
+        dev_mode = false;
+        LoadFromFile(keys_dir / "prod.keys_autogenerated", false);
+        LoadFromFile(keys_dir / "prod.keys", false);
+    }
     LoadFromFile(keys_dir / "title.keys_autogenerated", true);
     LoadFromFile(keys_dir / "title.keys", true);
     LoadFromFile(keys_dir / "console.keys_autogenerated", false);
@@ -838,7 +846,7 @@ void KeyManager::WriteKeyToFile(KeyCategory category, std::string_view keyname,
 
     std::string filename = "title.keys_autogenerated";
     if (category == KeyCategory::Standard) {
-        filename = "prod.keys_autogenerated";
+        filename = dev_mode ? "dev.keys_autogenerated" : "prod.keys_autogenerated";
     } else if (category == KeyCategory::Console) {
         filename = "console.keys_autogenerated";
     }
@@ -936,6 +944,8 @@ bool KeyManager::KeyFileExists(bool title) {
     const auto keys_dir = Common::FS::GetEdenPath(Common::FS::EdenPath::KeysDir);
     if (title)
         return Common::FS::Exists(keys_dir / "title.keys");
+    if (Settings::values.use_dev_keys.GetValue())
+        return Common::FS::Exists(keys_dir / "dev.keys");
     return Common::FS::Exists(keys_dir / "prod.keys");
 }
 

src/core/crypto/key_manager.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
@@ -314,6 +314,7 @@ private:
     std::array<u8, 576> eticket_extended_kek{};
     RSAKeyPair<2048> eticket_rsa_keypair{};
 
+    bool dev_mode;
     void LoadFromFile(const std::filesystem::path& file_path, bool is_title_keys);
 
     template <size_t Size>

src/yuzu/configuration/configure_debug.cpp

@@ -12,6 +12,7 @@
 #include "common/logging/filter.h"
 #include "common/settings.h"
 #include "core/core.h"
+#include "core/crypto/key_manager.h"
 #include "ui_configure_debug.h"
 #include "yuzu/configuration/configure_debug.h"
 #include "yuzu/debugger/console.h"
@@ -45,6 +46,7 @@ void ConfigureDebug::SetConfiguration() {
     ui->reporting_services->setChecked(Settings::values.reporting_services.GetValue());
     ui->dump_audio_commands->setChecked(Settings::values.dump_audio_commands.GetValue());
     ui->quest_flag->setChecked(Settings::values.quest_flag.GetValue());
+    ui->use_dev_keys->setChecked(Settings::values.use_dev_keys.GetValue());
     ui->use_debug_asserts->setChecked(Settings::values.use_debug_asserts.GetValue());
     ui->use_auto_stub->setChecked(Settings::values.use_auto_stub.GetValue());
     ui->enable_all_controllers->setChecked(Settings::values.enable_all_controllers.GetValue());
@@ -105,6 +107,7 @@ void ConfigureDebug::ApplyConfiguration() {
     Settings::values.reporting_services = ui->reporting_services->isChecked();
     Settings::values.dump_audio_commands = ui->dump_audio_commands->isChecked();
     Settings::values.quest_flag = ui->quest_flag->isChecked();
+    Settings::values.use_dev_keys = ui->use_dev_keys->isChecked();
     Settings::values.use_debug_asserts = ui->use_debug_asserts->isChecked();
     Settings::values.use_auto_stub = ui->use_auto_stub->isChecked();
     Settings::values.enable_all_controllers = ui->enable_all_controllers->isChecked();
@@ -126,6 +129,7 @@ void ConfigureDebug::ApplyConfiguration() {
     Common::Log::Filter filter;
     filter.ParseFilterString(Settings::values.log_filter.GetValue());
     Common::Log::SetGlobalFilter(filter);
+    Core::Crypto::KeyManager::Instance().ReloadKeys();
 }
 
 void ConfigureDebug::changeEvent(QEvent* event) {

src/yuzu/configuration/configure_debug.ui

@@ -435,6 +435,13 @@
            </property>
           </widget>
          </item>
+         <item row="1" column="0">
+          <widget class="QCheckBox" name="use_dev_keys">
+           <property name="text">
+            <string>Use dev.keys</string>
+           </property>
+          </widget>
+         </item>
          <item row="2" column="0">
           <widget class="QCheckBox" name="use_debug_asserts">
            <property name="text">

src/yuzu/main_window.cpp

@@ -139,6 +139,8 @@ static FileSys::VirtualFile VfsDirectoryCreateFileWrapper(const FileSys::Virtual
 
 #include "core/perf_stats.h"
 
+#include "core/crypto/key_manager.h"
+
 // Input //
 #include "hid_core/hid_core.h"
 #include "hid_core/frontend/emulated_controller.h"
@@ -564,6 +566,9 @@ MainWindow::MainWindow(bool has_broken_vulkan)
     // Check for orphaned profiles and reset profile data if necessary
     QtCommon::Content::FixProfiles();
 
+    if (Settings::values.use_dev_keys.GetValue()) {
+        Core::Crypto::KeyManager::Instance().ReloadKeys();
+    }
     game_list->LoadCompatibilityList();
     game_list->PopulateAsync(UISettings::values.game_dirs);