chore: bump version to v0.6.1

- Drop thread priority by 1
- Reduce signed/unsigned conversions

.gitignore

@@ -1,3 +1,4 @@
 build/
 .cache/
 cmake-build-*
+.vscode/

CMakeLists.txt

@@ -1,10 +1,26 @@
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.14)
 
-project(kgg-dec VERSION 0.6.0 LANGUAGES CXX)
+project(kgg-dec VERSION 0.6.1 LANGUAGES CXX)
 
+option(USE_SYSTEM_SQLITE3 "Use system SQLite3 (if not using WinSQLite3)" ON)
+option(USE_OPENSSL "Use OpenSSL API (if not using WinCrypto API)" ON)
+
+if(WIN32)
+    option(USE_WIN_SQLITE3 "Use Windows SQLite3 (MSVC Only)" ${MSVC})
+    option(USE_WIN_CRYPTO "Use Windows Crypto API" ${WIN32})
+else()
+    set(USE_WIN_SQLITE3 OFF)
+    set(USE_WIN_CRYPTO OFF)
+endif()
+
+# Setup CryptoAPI
+if (NOT USE_WIN_CRYPTO AND USE_OPENSSL)
+    find_package(OpenSSL REQUIRED)
+endif()
+
+include(cmake/SetupSQLite3.cmake)
 add_subdirectory(third-party/aes)
 add_subdirectory(third-party/md5)
-add_subdirectory(third-party/sqlite3)
 
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -27,6 +43,29 @@ target_include_directories(kgg-dec
         src/tc_tea
 )
 
-target_link_libraries(kgg-dec PRIVATE shell32 ole32 libaes libmd5 sqlite3)
+# Base crypto implementations
-target_compile_definitions(kgg-dec PRIVATE NOMINMAX)
+target_link_libraries(kgg-dec PRIVATE libaes libmd5)
+if (USE_WIN_CRYPTO)
+    target_compile_definitions(kgg-dec PRIVATE USE_WIN_CRYPTO=1)
+elseif(USE_OPENSSL)
+    target_compile_definitions(kgg-dec PRIVATE USE_OPENSSL=1)
+endif ()
+
+# Win32 specific
+if (WIN32)
+    target_link_libraries(kgg-dec PRIVATE shell32 ole32)
+    target_compile_definitions(kgg-dec PRIVATE NOMINMAX)
+endif ()
+
+# SQLite3
+if (WinSQLite3_Found)
+    target_link_libraries(kgg-dec PRIVATE WinSQLite3)
+    target_include_directories(kgg-dec PRIVATE ${WindowsKitInclude})
+elseif(SQLite3_FOUND)
+    target_link_libraries(kgg-dec PRIVATE SQLite::SQLite3)
+else ()
+    target_link_libraries(kgg-dec PRIVATE sqlite3)
+endif ()
+
+# Extra definitions
 target_compile_definitions(kgg-dec PRIVATE KGGDEC_PROJECT_VERSION="${PROJECT_VERSION}")

CMakePresets.json

@@ -9,7 +9,7 @@
     {
       "name": "default",
       "hidden": true,
-      "generator": "Ninja",
+      "generator": "Ninja Multi-Config",
       "cacheVariables": {
         "CMAKE_EXPORT_COMPILE_COMMANDS": "ON"
       }
@@ -29,13 +29,22 @@
         "CMAKE_EXE_LINKER_FLAGS": "-static -static-libgcc -static-libstdc++ -lucrt"
       }
     },
+    {
+      "name": "ninja",
+      "inherits": "default",
+      "description": "Default Ninja Configuration",
+      "binaryDir": "${sourceDir}/build/default"
+    },
     {
       "name": "vs",
       "inherits": "default",
       "description": "Configure for Visual Studio",
       "generator": "Visual Studio 17 2022",
       "binaryDir": "${sourceDir}/build/vs2022",
-      "architecture": "x64"
+      "architecture": "x64,version=10.0",
+      "toolset": {
+        "value": "v143"
+      }
     }
   ],
   "buildPresets": [
@@ -51,6 +60,18 @@
       "description": "Build using MinGW (Release)",
       "configuration": "Release"
     },
+    {
+      "name": "ninja-debug",
+      "configurePreset": "ninja",
+      "description": "Build using Ninja (Debug)",
+      "configuration": "Debug"
+    },
+    {
+      "name": "ninja-release",
+      "configurePreset": "ninja",
+      "description": "Build using Ninja (Release)",
+      "configuration": "Release"
+    },
     {
       "name": "vs-debug",
       "configurePreset": "vs",

README.MD

@@ -50,7 +50,30 @@ cmake --build --preset vs-release --config Release
 copy /y README.MD .\\build\\vs2022\\
 ```
 
-## 第三方软件
+### CMake 参数
+
+CMake 支持以下参数：
+
+- `USE_WIN_SQLITE3` - 使用 Windows 内置的 SQLite3 链接库（仅限 Windows + MSVC 编译环境）。
+- `USE_WIN_CRYPTO` - 使用 Windows 内置的加密/哈希实现，而非软件实现（仅限 Windows 目标）。
+- `USE_SYSTEM_SQLITE3` - 使用外部的 SQLite3 实现 (Debian: `libsqlite3-dev`)，找不到时会报错。
+- `USE_OpenSSL` - 使用 OpenSSL 的加密/哈希实现 (Debian: `libssl-dev`)，找不到时会报错。
+
+Ubuntu 下编译发布版，不使用外部库：
+
+```sh
+cmake -G "Ninja Multi-Config" -B build/linux-all -DUSE_SYSTEM_SQLITE3=0 -DUSE_OPENSSL=0
+cmake --build build/linux-all --config Release -j
+```
+
+Ubuntu 下编译发布版，链接到现有的库：
+
+```sh
+cmake -G "Ninja Multi-Config" -B build/linux-ext -DUSE_SYSTEM_SQLITE3=1 -DUSE_OPENSSL=1
+cmake --build build/linux-ext --config Release -j
+```
+
+### 第三方软件
 
 该程序用到了以下第三方软件：
 
@@ -58,3 +81,10 @@ copy /y README.MD .\\build\\vs2022\\
 - [Tiny AES in C](https://github.com/kokke/tiny-AES-c) (Public Domain)
 - [MD5.c](https://github.com/freebsd/freebsd-src/blob/release/14.2.0/sys/kern/md5c.c) (from FreeBSD)
     - Derived from the "RSA Data Security, Inc. MD5 Message-Digest Algorithm".
+
+### Windows 7 用户注意
+
+请从 SQLite 官网下载 [`sqlite-dll-win-x64-*.zip`](https://www.sqlite.org/download.html#win32)
+并将压缩包内的 `sqlite3.dll` 放置到 `kgg-dec.exe` 同目录下，并更名为 `winsqlite3.dll`。
+
+Windows 10 或更新版本不需要此操作，因为 Windows 10 或以上的版本内置该文件。 

cmake/SetupSQLite3.cmake

@@ -0,0 +1,24 @@
+set(WinSQLite3_Found FALSE)
+
+if (MSVC AND USE_WIN_SQLITE3)
+    set(ProgramFiles_x86 "$ENV{ProgramFiles\(x86\)}")
+    file(GLOB WindowsKitLibs "${ProgramFiles_x86}/Windows Kits/10/Lib/10.0.*/um/${CMAKE_VS_PLATFORM_NAME}")
+    find_library(LibWinSQLite3 WinSQLite3 PATHS ${WindowsKitLibs})
+    if (LibWinSQLite3)
+        set(WinSQLite3_Found TRUE)
+        get_filename_component(WindowsKitVersion "${LibWinSQLite3}/../../.." ABSOLUTE)
+        get_filename_component(WindowsKitVersion ${WindowsKitVersion} NAME)
+        set(WindowsKitInclude "${ProgramFiles_x86}/Windows Kits/10/Include/${WindowsKitVersion}/um")
+        message("Using WinSQLite3 from Windows SDK (${WindowsKitVersion}).")
+    endif ()
+endif ()
+
+if (NOT WinSQLite3_Found)
+    if (USE_SYSTEM_SQLITE3)
+        message("Using existing SQLite3.")
+        find_package(SQLite3 REQUIRED)
+    else()
+        message("including sqlite3 to the build")
+        add_subdirectory(third-party/sqlite3)
+    endif()
+endif()

src/common/endian_helper.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <bit>
+#include <cstddef>
 #include <cstdint>
 #include <type_traits>
 

src/common/sqlite3_wrapper.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#if __has_include(<sqlite3.h>)
+#include <sqlite3.h>
+#else
+#include <winsqlite/winsqlite3.h>
+#endif

src/common/str_helper.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <cstdio>
+#include <string>
+#include <string_view>
+
+namespace lsr {
+
+#if _WIN32
+typedef wchar_t character;
+typedef std::wstring string;
+typedef std::wstring_view string_view;
+#define LSR_STR(x) L##x
+
+inline void write_stderr(const string& msg) {
+    fputws(msg.c_str(), stderr);
+}
+#else
+typedef char character;
+typedef std::string string;
+typedef std::string_view string_view;
+#define LSR_STR(x) x
+
+inline void write_stderr(const string& msg) {
+    fputs(msg.c_str(), stderr);
+}
+#endif
+
+}  // namespace lsr
+
+#if _WIN32
+#define lsr___fprintf fwprintf
+#else
+#define lsr___fprintf fprintf
+#endif
+
+#define lsr_eprintf(fmt, ...) lsr___fprintf(stderr, LSR_STR(fmt), __VA_ARGS__)
+#define lsr_printf(fmt, ...) lsr___fprintf(stdout, LSR_STR(fmt), __VA_ARGS__)

src/infra/infra.cpp

@@ -3,10 +3,15 @@
 #include <aes.h>
 #include <endian_helper.h>
 #include <md5.h>
-#include <sqlite3.h>
+#include <sqlite3_wrapper.h>
+
+#include <algorithm>
+#include <array>
 #include <fstream>
+#include <vector>
 
 namespace Infra {
+using std::size_t;
 
 constexpr size_t kPageSize = 0x400;
 
@@ -18,15 +23,15 @@ inline bool is_valid_page_1_header(const uint8_t* page1) {
 }
 
 void derive_page_key(uint8_t* aes_key, uint8_t* aes_iv, const uint8_t* p_master_key, const uint32_t page_no) {
-    uint8_t buffer[0x18];
+    std::array<uint8_t, 0x18> buffer{};
 
     // Setup buffer
-    memcpy(buffer, p_master_key, 0x10);
+    std::copy_n(p_master_key, 0x10, buffer.begin());
     Endian::le_write(&buffer[0x10], page_no);
     Endian::le_write(&buffer[0x14], 0x546C4173);
 
     // Derive Key
-    md5(aes_key, buffer, 24);
+    md5(aes_key, buffer.data(), buffer.size());
 
     // Derive IV
     for (uint32_t ebx{page_no + 1}, i = 0; i < 16; i += 4) {
@@ -38,10 +43,10 @@ void derive_page_key(uint8_t* aes_key, uint8_t* aes_iv, const uint8_t* p_master_
         ebx = ecx;
         Endian::le_write(&buffer[i], ebx);
     }
-    md5(aes_iv, buffer, 16);
+    md5(aes_iv, buffer.data(), 0x10);
 
     // Cleanup
-    memset(buffer, 0xCC, sizeof(buffer));
+    std::ranges::fill(buffer, 0xcc);
 }
 
 static const uint8_t kDefaultMasterKey[0x10] = {
@@ -49,8 +54,8 @@ static const uint8_t kDefaultMasterKey[0x10] = {
     0x3d, 0x18, 0x96, 0x72, 0x14, 0x4f, 0xe4, 0xbf,  //
 };
 
-static constexpr uint8_t kSQLiteDatabaseHeader[0x10] = {'S', 'Q', 'L', 'i', 't', 'e', ' ', 'f',
+static constexpr std::array<uint8_t, 0x10> kSQLiteDatabaseHeader = {  //
-                                                        'o', 'r', 'm', 'a', 't', ' ', '3', 0};
+    'S', 'Q', 'L', 'i', 't', 'e', ' ', 'f', 'o', 'r', 'm', 'a', 't', ' ', '3', 0};
 
 int load_db(std::vector<uint8_t>& db_data, const std::filesystem::path& db_path) {
     using namespace AES;
@@ -87,28 +92,31 @@ int load_db(std::vector<uint8_t>& db_data, const std::filesystem::path& db_path)
         }
 
         if (page_no == 1) [[unlikely]] {
-            if (memcmp(p_page, kSQLiteDatabaseHeader, 0x10) == 0) {
+            if (std::equal(kSQLiteDatabaseHeader.cbegin(), kSQLiteDatabaseHeader.cend(), p_page)) {
                 ifs_db.read(reinterpret_cast<char*>(p_page + kPageSize),
                             static_cast<std::streamsize>(db_size - kPageSize));
+                AES_cleanup(&ctx_aes);
                 return SQLITE_OK;  // no encryption
             }
 
-            if (!is_valid_page_1_header(p_page)) [[unlikely]] {
+            if (!is_valid_page_1_header(p_page)) {
+                AES_cleanup(&ctx_aes);
                 db_data.clear();
                 return SQLITE_CORRUPT;  // header validation failed
             }
-            uint8_t backup[0x08];  // backup magic numbers
+            std::array<uint8_t, 8> backup{};  // backup magic numbers
-            memcpy(&backup, &p_page[0x10], 0x08);
+            std::copy_n(&p_page[0x10], 0x08, backup.begin());
-            memcpy(&p_page[0x10], &p_page[0x08], 0x08);
+            std::copy_n(&p_page[0x08], 0x08, &p_page[0x10]);
             AES_CBC_decrypt_buffer(&ctx_aes, p_page + 0x10, kPageSize - 0x10);
-            if (memcmp(backup, &p_page[0x10], 0x08) != 0) {
+            if (!std::equal(backup.cbegin(), backup.cend(), &p_page[0x10])) {
                 db_data.clear();
                 return SQLITE_CORRUPT;  // header validation failed
             }
-            memcpy(p_page, kSQLiteDatabaseHeader, 0x10);
+            std::ranges::copy(kSQLiteDatabaseHeader, p_page);
         } else {
             AES_CBC_decrypt_buffer(&ctx_aes, p_page, kPageSize);
         }
+        AES_cleanup(&ctx_aes);
     }
 
     return SQLITE_OK;

src/infra/infra.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include <filesystem>
-#include <optional>
 #include <unordered_map>
 
 namespace Infra {

src/jobs.hpp

@@ -1,52 +1,58 @@
 #pragma once
-#include <windows.h>
 
+#include <algorithm>
+#include "infra/infra.h"
+#include "qmc2/qmc2.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <pthread.h>
+#endif
+
+#include <endian_helper.h>
+#include <str_helper.h>
 #include <array>
+#include <condition_variable>
 #include <filesystem>
 #include <fstream>
 #include <mutex>
 #include <queue>
-#include <string>
-#include <string_view>
-#include <utility>
 #include <vector>
 
-#include "qmc2/qmc2.h"
-
 class KggTask {
    public:
     explicit KggTask(std::filesystem::path kgg_path, std::filesystem::path out_dir)
         : kgg_path_(std::move(kgg_path)), out_dir_(std::move(out_dir)) {}
 
-    void warning(const wchar_t* msg) const { fwprintf(stderr, L"[WARN] %s (%s)\n", msg, kgg_path_.filename().c_str()); }
+    void log(const lsr::string& level, const lsr::string& msg) const {
-    void warning(const std::wstring& msg) const { warning(msg.c_str()); }
+        lsr_eprintf("[%s] %s (%s)\n", level.c_str(), msg.c_str(), kgg_path_.filename().c_str());
+    }
+    void warning(const lsr::string& msg) const { log(LSR_STR("WARN"), msg); }
+    void error(const lsr::string& msg) const { log(LSR_STR("ERR "), msg); }
+    void info(const lsr::string& msg) const { log(LSR_STR("INFO"), msg); }
 
-    void error(const wchar_t* msg) const { fwprintf(stderr, L"[ERR ] %s (%s)\n", msg, kgg_path_.filename().c_str()); }
+    void Execute(const Infra::kgm_ekey_db_t& ekey_db, const lsr::string_view suffix) const {
-    void error(const std::wstring& msg) const { error(msg.c_str()); }
-
-    void info(const wchar_t* msg) const { fwprintf(stderr, L"[INFO] %s (%s)\n", msg, kgg_path_.filename().c_str()); }
-    void info(const std::wstring& msg) const { info(msg.c_str()); }
-
-    void Execute(const Infra::kgm_ekey_db_t& ekey_db, const std::wstring_view suffix) const {
         constexpr static std::array<uint8_t, 16> kMagicHeader{0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
                                                               0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14};
 
         std::ifstream kgg_stream_in(kgg_path_, std::ios::binary);
-        char header[0x100]{};
+        std::array<uint8_t, 0x400> header{};
-        kgg_stream_in.read(header, sizeof(header));
+        kgg_stream_in.read(reinterpret_cast<char*>(header.data()), header.size());
-        if (std::equal(kMagicHeader.cbegin(), kMagicHeader.cend(), header)) {
+        if (!std::equal(kMagicHeader.cbegin(), kMagicHeader.cend(), header.cbegin())) {
-            warning(L"invalid kgg header");
+            warning(LSR_STR("invalid kgg header (not a kgg file)"));
             return;
         }
-        const uint32_t offset_to_audio = *reinterpret_cast<uint32_t*>(&header[0x10]);
+        const auto offset_to_audio = Endian::le_read<uint32_t>(&header[0x10]);
-        const uint32_t encrypt_mode = *reinterpret_cast<uint32_t*>(&header[0x14]);
+        if (const auto mode = Endian::le_read<uint32_t>(&header[0x14]); mode != 5) {
-        if (encrypt_mode != 5) {
+            lsr_eprintf("[WARN] unsupported enc_version (expect=0x05, got 0x%02x) (%s)\n", mode,
-            warning(std::format(L"unsupported enc_version (expect=0x05, got 0x{:02x})", encrypt_mode));
+                        kgg_path_.filename().c_str());
             return;
         }
         uint32_t audio_hash_len = *reinterpret_cast<uint32_t*>(&header[0x44]);
         if (audio_hash_len != 0x20) {
-            warning(std::format(L"audio hash length invalid (expect=0x20, got 0x{:02x})", audio_hash_len));
+            lsr_eprintf("audio hash length invalid (expect=0x20, got 0x%02x) (%s)\n", audio_hash_len,
+                        kgg_path_.filename().c_str());
             return;
         }
         std::string audio_hash(&header[0x48], &header[0x48 + audio_hash_len]);
@@ -54,70 +60,77 @@ class KggTask {
         if (auto it = ekey_db.find(audio_hash); it != ekey_db.end()) {
             ekey = it->second;
         } else {
-            warning(L"ekey not found");
+            warning(LSR_STR("ekey not found"));
             return;
         }
 
         auto qmc2 = QMC2::Create(ekey);
         if (!qmc2) {
-            error(L"create qmc2 instance failed (ekey decode error?)");
+            error(LSR_STR("create qmc2 instance failed (ekey decode error?)"));
             fprintf(stderr, "%s\n", ekey.c_str());
             return;
         }
 
-        std::string magic(4, 0);
+        std::array<uint8_t, 4> magic{};
         kgg_stream_in.seekg(offset_to_audio, std::ios::beg);
-        kgg_stream_in.read(magic.data(), 4);
+        kgg_stream_in.read(reinterpret_cast<char*>(magic.data()), 4);
-        qmc2->Decrypt(std::span(reinterpret_cast<uint8_t*>(magic.data()), 4), 0);
+        qmc2->Decrypt(magic, 0);
         auto real_ext = DetectRealExt(magic);
-        auto out_path = out_dir_ / std::format(L"{}{}.{}", kgg_path_.stem().wstring(), suffix, real_ext);
+
+        lsr::string new_name = kgg_path_.stem().native() + lsr::string(suffix) + LSR_STR(".") + real_ext;
+        auto out_path = out_dir_ / new_name;
 
         if (exists(out_path)) {
-            warning(std::format(L"output file already exists: {}", out_path.filename().wstring()));
+            warning(lsr::string(LSR_STR("output file already exists: ")) + new_name);
             return;
         }
 
+        kgg_stream_in.seekg(0, std::ios::end);
+        const auto file_size = static_cast<size_t>(kgg_stream_in.tellg());
         kgg_stream_in.seekg(offset_to_audio, std::ios::beg);
         std::ofstream ofs_decrypted(out_path, std::ios::binary);
         if (!ofs_decrypted.is_open()) {
-            error(L"failed to open output file");
+            error(LSR_STR("failed to open output file"));
             return;
         }
 
         size_t offset{0};
         thread_local std::vector<uint8_t> temp_buffer(1024 * 1024, 0);
-        auto buf_signed = std::span(reinterpret_cast<char*>(temp_buffer.data()), temp_buffer.size());
+        auto read_page_len = static_cast<std::streamsize>(temp_buffer.size());
-        auto buf_unsigned = std::span(temp_buffer);
 
         while (!kgg_stream_in.eof()) {
-            kgg_stream_in.read(buf_signed.data(), buf_signed.size());
+            kgg_stream_in.read(reinterpret_cast<char*>(temp_buffer.data()), read_page_len);
-            const auto n = static_cast<size_t>(kgg_stream_in.gcount());
+            const auto n = kgg_stream_in.gcount();
-            qmc2->Decrypt(buf_unsigned.subspan(0, n), offset);
+            qmc2->Decrypt(std::span(temp_buffer.begin(), temp_buffer.begin() + n), offset);
-            ofs_decrypted.write(buf_signed.data(), n);
+            ofs_decrypted.write(reinterpret_cast<char*>(temp_buffer.data()), n);
             offset += n;
         }
 
-        info(std::format(L"** OK **  -> {}", out_path.filename().wstring()));
+        if (offset + offset_to_audio != file_size) {
+            warning(LSR_STR("OK (size mismatch)"));
+        } else {
+            info(lsr::string(LSR_STR("** OK **  -> ")) + out_path.filename().native());
+        }
     }
 
    private:
     std::filesystem::path kgg_path_;
     std::filesystem::path out_dir_;
 
-    static const wchar_t* DetectRealExt(const std::string_view magic) {
+    static const lsr::character* DetectRealExt(const std::span<uint8_t> magic) {
-        if (magic == "fLaC") {
+        if (std::equal(magic.begin(), magic.end(), "fLaC")) {
-            return L"flac";
+            return LSR_STR("flac");
         }
-        if (magic == "OggS") {
+        if (std::equal(magic.begin(), magic.end(), "OggS")) {
-            return L"ogg";
+            return LSR_STR("ogg");
         }
-        return L"mp3";
+        return LSR_STR("mp3");
     }
 };
 
 class KggTaskQueue {
    public:
-    explicit KggTaskQueue(Infra::kgm_ekey_db_t ekey_db, const std::wstring_view suffix)
+    explicit KggTaskQueue(Infra::kgm_ekey_db_t ekey_db, const lsr::string_view suffix)
         : ekey_db_(std::move(ekey_db)), suffix_(suffix) {}
 
     void Push(std::unique_ptr<KggTask> task) {
@@ -161,16 +174,34 @@ class KggTaskQueue {
    private:
     bool thread_end_{false};
     Infra::kgm_ekey_db_t ekey_db_;
-    std::wstring suffix_;
+    lsr::string suffix_;
     void WorkerThreadBody() {
-        SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_BELOW_NORMAL);
+        ReduceThreadPriority();
-
         std::unique_ptr<KggTask> task{nullptr};
         while ((task = Pop())) {
             task->Execute(ekey_db_, suffix_);
         }
     }
 
+    static void ReduceThreadPriority() {
+#ifdef _WIN32
+        SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_BELOW_NORMAL);
+#else
+        pthread_t this_thread = pthread_self();
+        sched_param params;
+        int policy;
+
+        if (pthread_getschedparam(this_thread, &policy, &params) != 0) {
+            perror("pthread_getschedparam");
+            return;
+        }
+        params.sched_priority = std::max(params.sched_priority, sched_get_priority_min(policy));
+        if (pthread_setschedparam(this_thread, policy, &params) != 0) {
+            perror("pthread_setschedparam");
+        }
+#endif
+    }
+
     std::mutex mutex_{};
     std::condition_variable signal_;
     std::queue<std::unique_ptr<KggTask>> tasks_{};

src/main.cpp

@@ -1,6 +1,11 @@
-#include <sqlite3.h>
+#include <sqlite3_wrapper.h>
+
+#include <filesystem>
+#include <queue>
+
 #include "infra/infra.h"
 #include "jobs.hpp"
+#include "str_helper.h"
 #include "utils/cli.h"
 
 using Infra::kgm_ekey_db_t;
@@ -29,7 +34,7 @@ void WalkFileOrDir(KggTaskQueue& queue, const std::filesystem::path& input_path,
             continue;
         }
 
-        fwprintf(stderr, L"[WARN] invalid path: %s\n", target_path.c_str());
+        lsr_eprintf("[WARN] invalid path: %s\n", target_path.c_str());
     }
 }
 
@@ -55,11 +60,11 @@ void print_banner() {
     print_usage();
 }
 
-int main() {
+int main(int argc, char** argv) {
     CliParser cli_args;
     print_banner();
 
-    cli_args.parse_from_cli();
+    cli_args.parse_from_cli(argc, argv);
 
     bool scan_all_exts = cli_args.get_scan_all_file_ext();
 
@@ -104,7 +109,7 @@ int main() {
 
     auto input_files = cli_args.get_input_files();
     if (input_files.empty()) {
-        input_files.emplace_back(L".");
+        input_files.emplace_back(LSR_STR("."));
     }
     for (auto& positional_arg : input_files) {
         WalkFileOrDir(queue, positional_arg, scan_all_exts);

src/utils/cli.cpp

@@ -1,47 +1,58 @@
 #include "cli.h"
+#include <str_helper.h>
 
-#include <Windows.h>
+#ifdef _WIN32
-#include <clocale>
-
 // clang-format off
+#include <clocale>
+#include <Windows.h>
 #include <shlobj.h>
 #include <knownfolders.h>
 // clang-format on
+#endif
 
 CliParser::CliParser() {
+#ifdef _WIN32
     SetConsoleOutputCP(CP_UTF8);
     setlocale(LC_ALL, ".UTF8");
+#endif
 }
 
-void CliParser::parse_from_cli() {
+void CliParser::parse_from_cli(int argc_, char** argv_) {
-    int argc;
+    int argc{argc_};
+#ifdef _WIN32
     wchar_t** argv = CommandLineToArgvW(GetCommandLineW(), &argc);
+#else
+    char**& argv = argv_;
+#endif
 
-    std::vector<std::wstring> positional_args{};
+    std::vector<lsr::string> positional_args{};
-    std::unordered_map<std::wstring, std::wstring> named_args{};
+    std::unordered_map<lsr::string, lsr::string> named_args{};
 
     bool positional_only{false};
     for (int i = 1; i < argc; i++) {
-        std::wstring arg{argv[i]};
+        lsr::string arg{argv[i]};
-        if (arg == L"--") {
+        if (arg == LSR_STR("--")) {
             positional_only = true;
             continue;
         }
 
-        if (!positional_only && arg.starts_with(L"--")) {
+        if (!positional_only && arg.starts_with(LSR_STR("--"))) {
             auto pos = arg.find(L'=');
-            if (pos != std::wstring::npos) {
+            if (pos != lsr::string::npos) {
                 named_args[arg.substr(2, pos - 2)] = arg.substr(pos + 1);
             } else if (++i < argc) {
                 named_args[arg.substr(2)] = argv[i];
             } else {
-                named_args[arg.substr(2)] = L"";
+                named_args[arg.substr(2)] = LSR_STR("");
             }
         } else {
             positional_args.push_back(arg);
         }
     }
+
+#ifdef _WIN32
     LocalFree(argv);
+#endif
 
     positional_args_ = positional_args;
     named_args_ = named_args;
@@ -49,13 +60,18 @@ void CliParser::parse_from_cli() {
 
 std::filesystem::path CliParser::get_db_path() const {
     std::filesystem::path kugou_db{};
-    if (const auto& it = named_args_.find(L"db"); it != named_args_.end()) {
+
+    if (const auto& it = named_args_.find(LSR_STR("db")); it != named_args_.end()) {
         kugou_db = std::filesystem::path{it->second};
     } else {
+#ifdef _WIN32
         PWSTR pAppDirPath{};
         SHGetKnownFolderPath(FOLDERID_RoamingAppData, 0, nullptr, &pAppDirPath);
         kugou_db = std::filesystem::path{pAppDirPath} / L"Kugou8" / L"KGMusicV3.db";
         CoTaskMemFree(pAppDirPath);
+#else
+        kugou_db = std::filesystem::path{"KGMusicV3.db"};
+#endif
     }
 
     return absolute(kugou_db);

src/utils/cli.h

@@ -1,30 +1,34 @@
 #pragma once
 
+#include <str_helper.h>
 #include <filesystem>
-#include <string>
 #include <unordered_map>
 #include <utility>
 #include <vector>
 
-typedef std::pair<std::vector<std::wstring>, std::unordered_map<std::wstring, std::wstring>> parsed_raw_args_t;
+typedef std::pair<std::vector<lsr::string>, std::unordered_map<lsr::string, lsr::string>> parsed_raw_args_t;
 
 class CliParser {
    public:
     CliParser();
-    void parse_from_cli();
+    void parse_from_cli(int argc, char** argv);
 
     [[nodiscard]] std::filesystem::path get_infra_dll() const;
     [[nodiscard]] std::filesystem::path get_db_path() const;
-    [[nodiscard]] std::wstring get_file_suffix() const { return get_with_default(L"suffix", L"_kgg-dec"); }
+    [[nodiscard]] lsr::string get_file_suffix() const {
-    [[nodiscard]] bool get_scan_all_file_ext() const { return get_with_default(L"scan-all-file-ext", L"0") == L"1"; };
+        return get_with_default(LSR_STR("suffix"), LSR_STR("_kgg-dec"));
-    [[nodiscard]] std::vector<std::wstring> get_input_files() const { return positional_args_; }
+    }
+    [[nodiscard]] bool get_scan_all_file_ext() const {
+        return get_with_default(LSR_STR("scan-all-file-ext"), LSR_STR("0")) == LSR_STR("1");
+    };
+    [[nodiscard]] std::vector<lsr::string> get_input_files() const { return positional_args_; }
 
    private:
-    std::vector<std::wstring> positional_args_{};
+    std::vector<lsr::string> positional_args_{};
-    std::unordered_map<std::wstring, std::wstring> named_args_{};
+    std::unordered_map<lsr::string, lsr::string> named_args_{};
 
     static parsed_raw_args_t parse();
-    [[nodiscard]] std::wstring get_with_default(const std::wstring& key, const std::wstring& default_value) const {
+    [[nodiscard]] lsr::string get_with_default(const lsr::string& key, const lsr::string& default_value) const {
         if (const auto& it = named_args_.find(key); it != named_args_.end()) {
             return it->second;
         }

third-party/aes/CMakeLists.txt

@@ -5,10 +5,31 @@ project(libaes VERSION 0.0.1 LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-# Tiny AES in C (https://github.com/kokke/tiny-AES-c/) is licensed under the Unlicense license.
+set(SOURCES)
-add_library(libaes STATIC aes.cpp)
+if (USE_WIN_CRYPTO)
+    message("Using Windows Crypto API for AES-CBC-128")
+    list(APPEND SOURCES aes_win32.cpp)
+elseif (USE_OPENSSL)
+    message("Using OpenSSL API for AES-CBC-128")
+    find_package(OpenSSL REQUIRED)    
+    list(APPEND SOURCES aes_openssl.cpp)
+else ()
+    # Tiny AES in C (https://github.com/kokke/tiny-AES-c/)
+    #   is licensed under the Unlicense license.
+    message("Using included AES-CBC-128 implementation")
+    list(APPEND SOURCES aes.cpp)
+endif ()
+
+add_library(libaes STATIC ${SOURCES})
 target_include_directories(libaes
         PUBLIC
         "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>"
         "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
 )
+if (USE_WIN_CRYPTO)
+    target_link_libraries(libaes PRIVATE bcrypt)
+    target_compile_definitions(libaes PRIVATE USE_WIN_CRYPTO=1)
+elseif (USE_OPENSSL)
+    target_link_libraries(libaes PRIVATE OpenSSL::Crypto)
+    target_compile_definitions(libaes PRIVATE USE_OPENSSL=1)
+endif ()

third-party/aes/aes.cpp

@@ -129,9 +129,10 @@ void KeyExpansion(uint8_t* RoundKey, const uint8_t* Key) {
     }
 }
 
-void AES_init_ctx_iv(AES_ctx* ctx, const uint8_t* key, const uint8_t* iv) {
+bool AES_init_ctx_iv(AES_ctx* ctx, const uint8_t* key, const uint8_t* iv) {
     KeyExpansion(ctx->RoundKey, key);
     memcpy(ctx->Iv, iv, kBlockLen);
+    return true;
 }
 
 // This function adds the round key to state.
@@ -331,7 +332,7 @@ inline void XorWithIv(uint8_t* buf, const uint8_t* Iv) {
     }
 }
 
-void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length) {
+size_t AES_CBC_encrypt_buffer(AES_ctx* ctx, uint8_t* buf, size_t length) {
     uint8_t* Iv = ctx->Iv;
     for (size_t i = 0; i < length; i += kBlockLen) {
         XorWithIv(buf, Iv);
@@ -341,9 +342,10 @@ void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length) {
     }
     /* store Iv in ctx for next call */
     memcpy(ctx->Iv, Iv, kBlockLen);
+    return length;
 }
 
-void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length) {
+size_t AES_CBC_decrypt_buffer(AES_ctx* ctx, uint8_t* buf, size_t length) {
     for (size_t i = 0; i < length; i += kBlockLen) {
         uint8_t storeNextIv[kBlockLen];
         memcpy(storeNextIv, buf, kBlockLen);
@@ -352,6 +354,7 @@ void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length) {
         memcpy(ctx->Iv, storeNextIv, kBlockLen);
         buf += kBlockLen;
     }
+    return length;
 }
 
 }  // namespace AES

third-party/aes/aes.h

@@ -1,7 +1,16 @@
 #pragma once
 
+#include <cstddef>
 #include <cstdint>
 
+#if USE_WIN_CRYPTO
+#include <windows.h>
+
+#include <bcrypt.h>
+#elif USE_OPENSSL
+#include <openssl/evp.h>
+#endif
+
 namespace AES {
 
 constexpr size_t kKeyLen = 16;  // Key length in bytes
@@ -9,17 +18,33 @@ constexpr size_t kKeyExpansionSize = 176;
 constexpr size_t kBlockLen = 16;  // Block length in bytes - AES is 128b block only
 
 struct AES_ctx {
+#if USE_WIN_CRYPTO
+    BCRYPT_ALG_HANDLE hAlg;
+    BCRYPT_KEY_HANDLE hKey;
+    uint8_t iv[0x10];
+#elif USE_OPENSSL
+    EVP_CIPHER_CTX* cipher_ctx;
+#else
     uint8_t RoundKey[kKeyExpansionSize];
     uint8_t Iv[16];
+#endif
 };
 
-void AES_init_ctx_iv(AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
+bool AES_init_ctx_iv(AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
 
 // buffer size MUST be mutile of AES_BLOCKLEN;
 // Suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
 // NOTES: you need to set IV in ctx via AES_init_ctx_iv() or AES_ctx_set_iv()
 //        no IV should ever be reused with the same key
-void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
+size_t AES_CBC_encrypt_buffer(AES_ctx* ctx, uint8_t* buf, size_t length);
-void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
+size_t AES_CBC_decrypt_buffer(AES_ctx* ctx, uint8_t* buf, size_t length);
+
+#if USE_WIN_CRYPTO || USE_OPENSSL
+bool AES_cleanup(AES_ctx* ctx);
+#else
+inline bool AES_cleanup(AES_ctx* ctx) {
+    return true;
+}
+#endif
 
 }  // namespace AES

third-party/aes/aes_openssl.cpp

@@ -0,0 +1,43 @@
+#include <cassert>
+#include <cstring>
+
+#include "aes.h"
+
+namespace AES {
+
+bool AES_init_ctx_iv(AES_ctx* ctx, const uint8_t* key, const uint8_t* iv) {
+    ctx->cipher_ctx = EVP_CIPHER_CTX_new();
+    if (!ctx->cipher_ctx) {
+        return false;
+    }
+
+    if (EVP_DecryptInit_ex(ctx->cipher_ctx, EVP_aes_128_cbc(), nullptr, key, iv) != 1) {
+        AES_cleanup(ctx);
+        return false;
+    }
+
+    EVP_CIPHER_CTX_set_padding(ctx->cipher_ctx, 0);
+    return true;
+}
+
+size_t AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length) {
+    // not implemented
+    return 0;
+}
+
+size_t AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length) {
+    auto buf_len = static_cast<int>(length);
+    EVP_DecryptUpdate(ctx->cipher_ctx, buf, &buf_len, buf, buf_len);
+    assert(buf_len == length && "AES_CBC_decrypt_buffer: buffer length mismatch");
+    return buf_len;
+}
+
+bool AES_cleanup(AES_ctx* ctx) {
+    if (ctx->cipher_ctx) {
+        EVP_CIPHER_CTX_free(ctx->cipher_ctx);
+        ctx->cipher_ctx = nullptr;
+    }
+    return true;
+}
+
+}  // namespace AES

third-party/aes/aes_win32.cpp

@@ -0,0 +1,59 @@
+#include <algorithm>
+#include <cassert>
+#include <cstring>
+
+#include "aes.h"
+
+namespace AES {
+// ReSharper disable CppCStyleCast
+
+bool AES_init_ctx_iv(AES_ctx* ctx, const uint8_t* key, const uint8_t* iv) {
+    memset(ctx, 0, sizeof(AES_ctx));
+
+    if (BCryptOpenAlgorithmProvider(&ctx->hAlg, BCRYPT_AES_ALGORITHM, nullptr, 0) != 0) {
+        return false;
+    }
+
+    if (BCryptSetProperty(ctx->hAlg, BCRYPT_CHAINING_MODE, (PUCHAR)BCRYPT_CHAIN_MODE_CBC, sizeof(BCRYPT_CHAIN_MODE_CBC),
+                          0) != 0) {
+        BCryptCloseAlgorithmProvider(ctx->hAlg, 0);
+        return false;
+    }
+
+    if (BCryptGenerateSymmetricKey(ctx->hAlg, &ctx->hKey, nullptr, 0, (PUCHAR)key, 0x10, 0) != 0) {
+        BCryptCloseAlgorithmProvider(ctx->hAlg, 0);
+        return false;
+    }
+
+    std::copy_n(iv, 0x10, ctx->iv);
+    return true;
+}
+
+// buffer size MUST be mutile of AES_BLOCKLEN;
+// Suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
+// NOTES: you need to set IV in ctx via AES_init_ctx_iv() or AES_ctx_set_iv()
+//        no IV should ever be reused with the same key
+size_t AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length) {
+    // not implemented
+    return 0;
+}
+size_t AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length) {
+    ULONG cbData{0};
+    const auto len = static_cast<ULONG>(length);
+    if (BCryptDecrypt(ctx->hKey, buf, len, nullptr, ctx->iv, sizeof(ctx->iv), buf, len, &cbData, 0) != 0) {
+        assert(false && "BCryptDecrypt failed");
+        return 0;
+    }
+
+    assert(cbData == len && "AES_CBC_decrypt_buffer: cbData != length");
+    return cbData;
+}
+
+bool AES_cleanup(AES_ctx* ctx) {
+    BCryptDestroyKey(ctx->hKey);
+    BCryptCloseAlgorithmProvider(ctx->hAlg, 0);
+    memset(ctx, 0, sizeof(AES_ctx));
+    return true;
+}
+
+}  // namespace AES

third-party/md5/CMakeLists.txt

@@ -5,11 +5,32 @@ project(md5 VERSION 0.0.1 LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-# Derived from the "RSA Data Security, Inc. MD5 Message-Digest Algorithm":
+set(SOURCES)
-# https://github.com/freebsd/freebsd-src/blob/release/14.2.0/sys/kern/md5c.c
+if (USE_WIN_CRYPTO)
-add_library(libmd5 STATIC md5.cpp)
+    message("Using Windows Crypto API for MD5")
+    list(APPEND SOURCES md5_win32.cpp)
+elseif (USE_OPENSSL)
+    message("Using OpenSSL API for MD5")
+    find_package(OpenSSL REQUIRED)
+    list(APPEND SOURCES md5_openssl.cpp)
+else ()
+    # Derived from the "RSA Data Security, Inc. MD5 Message-Digest Algorithm":
+    # https://github.com/freebsd/freebsd-src/blob/release/14.2.0/sys/kern/md5c.c
+    message("Using included MD5 implementation")
+    list(APPEND SOURCES md5.cpp)
+endif ()
+
+add_library(libmd5 STATIC ${SOURCES})
 target_include_directories(libmd5
         PUBLIC
         "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>"
         "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
 )
+
+if (USE_WIN_CRYPTO)
+    target_link_libraries(libmd5 PRIVATE crypt32)
+    target_compile_definitions(libmd5 PRIVATE USE_WIN_CRYPTO=1)
+elseif (USE_OPENSSL)
+    target_link_libraries(libmd5 PRIVATE OpenSSL::Crypto)
+    target_compile_definitions(libmd5 PRIVATE USE_OPENSSL=1)
+endif ()

third-party/md5/md5.h

@@ -1,23 +1,36 @@
 #pragma once
 
-// Derived from the "RSA Data Security, Inc. MD5 Message-Digest Algorithm":
-// src: https://github.com/freebsd/freebsd-src/blob/release/14.2.0/sys/kern/md5c.c
-
 #include <cstdint>
 
-#define MD5_BLOCK_LENGTH 64
+#if USE_WIN_CRYPTO
-#define MD5_DIGEST_LENGTH 16
+#include <windows.h>
-#define MD5_DIGEST_STRING_LENGTH (MD5_DIGEST_LENGTH * 2 + 1)
+
+#include <wincrypt.h>
+#elif USE_OPENSSL
+#include <openssl/evp.h>
+#endif
+
+#define MD5_DIGEST_LENGTH 16
 
-/* MD5 context. */
 struct MD5_CTX {
+#if USE_WIN_CRYPTO
+    HCRYPTPROV hProv;
+    HCRYPTHASH hHash;
+#elif USE_OPENSSL
+    EVP_MD_CTX* md_ctx;
+#else
     uint64_t count;           /* number of bits, modulo 2^64 (lsb first) */
     uint32_t state[4];        /* state (ABCD) */
     unsigned char buffer[64]; /* input buffer */
+#endif
 };
 
+#if USE_WIN_CRYPTO || USE_OPENSSL
+bool md5_init(MD5_CTX* ctx);
+bool md5_cleanup(MD5_CTX* ctx);
+#else
 /* MD5 initialization. Begins an MD5 operation, writing a new context. */
-inline void md5_init(MD5_CTX* context) {
+inline bool md5_init(MD5_CTX* context) {
     context->count = 0;
 
     /* Load magic initialization constants.  */
@@ -25,22 +38,31 @@ inline void md5_init(MD5_CTX* context) {
     context->state[1] = 0xefcdab89;
     context->state[2] = 0x98badcfe;
     context->state[3] = 0x10325476;
+
+    return true;
 }
 
+inline bool md5_cleanup(MD5_CTX* ctx) {
+    return true;
+}
+#endif
+
 void md5_update(MD5_CTX* ctx, const uint8_t* in, size_t len);
 void md5_final(MD5_CTX* ctx, uint8_t* digest);
 
 inline void md5(uint8_t* digest, const uint8_t* in, const size_t len) {
-    MD5_CTX ctx;
+    MD5_CTX ctx{};
     md5_init(&ctx);
     md5_update(&ctx, in, len);
     md5_final(&ctx, digest);
+    md5_cleanup(&ctx);
 }
 
 inline void md5(uint8_t* digest, const uint8_t* in, const size_t len, const uint8_t* in2, size_t len2) {
-    MD5_CTX ctx;
+    MD5_CTX ctx{};
     md5_init(&ctx);
     md5_update(&ctx, in, len);
     md5_update(&ctx, in2, len2);
     md5_final(&ctx, digest);
+    md5_cleanup(&ctx);
 }

third-party/md5/md5_openssl.cpp

@@ -0,0 +1,32 @@
+#include <openssl/evp.h>
+#include <cstring>
+#include "md5.h"
+
+bool md5_init(MD5_CTX* ctx) {
+    memset(ctx, 0, sizeof(*ctx));
+
+    ctx->md_ctx = EVP_MD_CTX_new();
+    if (!ctx->md_ctx) {
+        return false;
+    }
+
+    return EVP_DigestInit_ex(ctx->md_ctx, EVP_md5(), nullptr) == 1;
+}
+
+bool md5_cleanup(MD5_CTX* ctx) {
+    if (ctx->md_ctx != nullptr) {
+        EVP_MD_CTX_free(ctx->md_ctx);
+    }
+    memset(ctx, 0xcc, sizeof(*ctx));
+    return true;
+}
+
+void md5_update(MD5_CTX* ctx, const uint8_t* in, size_t len) {
+    EVP_DigestUpdate(ctx->md_ctx, in, len);
+}
+
+void md5_final(MD5_CTX* ctx, uint8_t* digest) {
+    unsigned int len{MD5_DIGEST_LENGTH};
+    EVP_DigestFinal_ex(ctx->md_ctx, digest, &len);
+    EVP_MD_CTX_reset(ctx->md_ctx);
+}

third-party/md5/md5_win32.cpp

@@ -0,0 +1,35 @@
+#include "md5.h"
+
+bool md5_init(MD5_CTX* ctx) {
+    if (!CryptAcquireContext(&ctx->hProv, nullptr, nullptr, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
+        return false;
+    }
+
+    // Create the hash object
+    if (!CryptCreateHash(ctx->hProv, CALG_MD5, 0, 0, &ctx->hHash)) {
+        CryptReleaseContext(ctx->hProv, 0);
+        return false;
+    }
+
+    return true;
+}
+
+void md5_update(MD5_CTX* ctx, const uint8_t* in, size_t len) {
+    CryptHashData(ctx->hHash, in, static_cast<DWORD>(len), 0);
+}
+
+void md5_final(MD5_CTX* ctx, uint8_t* digest) {
+    DWORD dataLen = MD5_DIGEST_LENGTH;
+    CryptGetHashParam(ctx->hHash, HP_HASHVAL, digest, &dataLen, 0);
+    CryptDestroyHash(ctx->hHash);
+    ctx->hHash = 0;
+}
+
+bool md5_cleanup(MD5_CTX* ctx) {
+    if (ctx->hHash) {
+        CryptDestroyHash(ctx->hHash);
+    }
+    CryptReleaseContext(ctx->hProv, 0);
+    memset(ctx, 0, sizeof(MD5_CTX));
+    return true;
+}