How to encrypt client files (just tips, not full working code)

Gesior.pl

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Some people ask me where did I add encrypt/decrypt functions in OTClient, so it's hard to run OTClient with modified files (or get content of files).

I post my functions with some weird files encoding (all files as 1 string), but every programmer will find interesting things in my code.

Encryption is very weak (XOR :D https://en.wikipedia.org/wiki/XOR_cipher), but as it's already implemented in OTClient (crypt.cpp) and I got compatible version of XOR in PHP it's good enough.

My encryption code is in '#ifdef AB' parts (so you can compile client to work with not encrypted files - for tests).

I made modifications in 5 files:

Verify content of .otmod file on HDD, ignore it and load copy of file that is stored encrypted inside .exe (RAM):
src/framework/core/module.cpp
PHP:
bool Module::load()
{
    if(m_loaded)
        return true;

    try {
        // add to package.loaded
        g_lua.getGlobalField("package", "loaded");
        g_lua.getRef(m_sandboxEnv);
        g_lua.setField(m_name);
        g_lua.pop();

        for(const std::string& depName : m_dependencies) {
            if(depName == m_name)
                stdext::throw_exception("cannot depend on itself");

            ModulePtr dep = g_modules.getModule(depName);
            if(!dep)
                stdext::throw_exception(stdext::format("dependency '%s' was not found", depName));

            if(dep->hasDependency(m_name, true))
                stdext::throw_exception(stdext::format("dependency '%s' is recursively depending on itself", depName));

            if(!dep->isLoaded() && !dep->load())
                stdext::throw_exception(stdext::format("dependency '%s' has failed to load", depName));
        }

#ifdef AB
    std::string allData = "Here put text of all encrypted files with special encoding made by PHP (compatible with this script decoding)"; /* ABUPDATE */
    //std::string allData = g_resources.readFileContents("/data/moduleLuaLoader_fakeFile_checkIntegrity.txt");
    Crypt* x = new Crypt();
    std::string fakeFilesSaltKey = x->sha256Encode("345435", false); /* ABUPDATE */
    std::string fakeFilesXorKey = x->sha256Encode("#%%gf\"\";{", false); /* ABUPDATE */
    std::string a = "";
#endif // AB

        if(m_sandboxed)
            g_lua.setGlobalEnvironment(m_sandboxEnv);

        for(const std::string& script : m_scripts) {

#ifdef AB
            int len = 2;
            char* t = new char[len];
            std::string source = script;
            if(!stdext::starts_with(script, "/"))
                source = g_lua.getCurrentSourcePath() + "/" + source;

            source = g_resources.guessFilePath(source, "lua");

            std::string buffer = g_resources.readFileContents(source);
            std::string bufferMD5 = g_resources.readFileContents(source + ".md5hashf");
            std::istringstream stream(allData);
            std::string key = x->sha512Encode(buffer + fakeFilesSaltKey, false);
            std::string d;
            bool v = false;

            while(!stream.eof())
            {
                delete[] t;
                t = new char[9];
                stream.read(t, 8);
                t[8] = 0;
                len = atoi(t);

                delete[] t;
                t = new char[len+1];
                stream.read(t, len);
                t[len] = 0;
                d = t;
                a = x->xorCrypt(x->base64Decode(d), key);

                delete[] t;
                t = new char[9];
                stream.read(t, 8);
                t[8] = 0;
                len = atoi(t);

                delete[] t;
                t = new char[len+1];
                stream.read(t, len);
                t[len] = 0;
                if(a == source)
                {
                    d = t;
                    a = x->xorCrypt(x->base64Decode(d), source + key).substr(0, buffer.length() + 2 * fakeFilesSaltKey.length());
                    v = true;
                    break;
                }
            }
            d.clear();
            delete[] t;

                //g_logger.error(stdext::format("code loaded %s", a));
            if(!v) // file not found in array
            {
                g_logger.error(stdext::format(":|%s", source));
                stdext::throw_exception(stdext::format(":|%s", source));
                //*((unsigned int*)0) = 0x0000;
            }

            if(x->sha512Encode(buffer + fakeFilesSaltKey, false) != bufferMD5) // fake file sha key is invalid
            {
                g_logger.error(stdext::format(".%s", source));
                stdext::throw_exception(stdext::format(".%s", source));
                //*((unsigned int*)0) = 0x0000;
            }
            if(x->sha256Encode(fakeFilesSaltKey + buffer + fakeFilesSaltKey, false) != x->sha256Encode(a, false)) // modified file, cannot load RAM copy
            {
                g_logger.error(stdext::format("-%s", source));
                stdext::throw_exception(stdext::format("-%s", source));
                //*((unsigned int*)0) = 0x0000;
            }
            a = a.substr(fakeFilesSaltKey.length(), a.length() - 2 * fakeFilesSaltKey.length());
            a = x->xorCrypt(x->base64Decode(a), source + fakeFilesXorKey);
            g_lua.loadBuffer(a, "@" + source);
            a.clear();
#else
            g_lua.loadScript(script);
#endif // AB
            g_lua.safeCall(0, 0);
        }

        const std::string& onLoadBuffer = std::get<0>(m_onLoadFunc);
        const std::string& onLoadSource = std::get<1>(m_onLoadFunc);
        if(!onLoadBuffer.empty()) {
            g_lua.loadBuffer(onLoadBuffer, onLoadSource);
            if(m_sandboxed) {
                g_lua.getRef(m_sandboxEnv);
                g_lua.setEnv();
            }
            g_lua.safeCall(0, 0);
        }

        if(m_sandboxed)
            g_lua.resetGlobalEnvironment();

        m_loaded = true;
        g_logger.debug(stdext::format("Loaded module '%s'", m_name));
    } catch(stdext::exception& e) {
        // remove from package.loaded
        g_lua.getGlobalField("package", "loaded");
        g_lua.pushNil();
        g_lua.setField(m_name);
        g_lua.pop();

        if(m_sandboxed)
            g_lua.resetGlobalEnvironment();
        g_logger.error(stdext::format("Unable to load module '%s': %s", m_name, e.what()));
        return false;
    }

    g_modules.updateModuleLoadOrder(asModule());

    for(const std::string& modName : m_loadLaterModules) {
        ModulePtr dep = g_modules.getModule(modName);
        if(!dep)
            g_logger.error(stdext::format("Unable to find module '%s' required by '%s'", modName, m_name));
        else if(!dep->isLoaded())
            dep->load();
    }

    return true;
}
Load only modules listed by PHP (block possibility to add new module like candy_bot):
src/framework/core/modulemanager.cpp
PHP:
void ModuleManager::discoverModules()
{
    // remove modules that are not loaded
    m_autoLoadModules.clear();
#ifdef AB
    Crypt* x = new Crypt();
    std::string a = "";
    int len = 2;
    char* t;
    std::string allData = "Here put text of all encrypted files with special encoding made by PHP (compatible with this script decoding)"; /* ABUPDATE */
    //std::string allData = g_resources.readFileContents("data/discoverModules_fakeFile_allowedList.txt");

    std::string fakeFilesDiscoverXorKey = x->sha256Encode("12343", false);/* ABUPDATE */
    allData = x->base64Decode(x->xorCrypt(x->base64Decode(allData), fakeFilesDiscoverXorKey));
#endif
    auto moduleDirs = g_resources.listDirectoryFiles("/");
    for(const std::string& moduleDir : moduleDirs) {
        auto moduleFiles = g_resources.listDirectoryFiles("/" + moduleDir);
        for(const std::string& moduleFile : moduleFiles) {
            if(g_resources.isFileType(moduleFile, "otmod")) {

#ifdef AB
                //g_logger.error(stdext::format("mod %s", "/" + moduleDir + "/" + moduleFile));
                t = new char[len];
                std::istringstream stream(allData);
                std::string d;
                bool v = false;
                while(!stream.eof())
                {
                    delete[] t;
                    t = new char[9];
                    stream.read(t, 8);
                    t[8] = 0;
                    len = atoi(t);

                    delete[] t;
                    t = new char[len+1];
                    stream.read(t, len);
                    t[len] = 0;
                    if(t == "/" + moduleDir + "/" + moduleFile)
                    {
                        v = true;
                        break;
                    }
                }
                delete[] t;

                if(!v)
                {
                    g_logger.error(stdext::format("failed to load %s", "/" + moduleDir + "/" + moduleFile));
                    continue;
                }
#endif
                ModulePtr module = discoverModule("/" + moduleDir + "/" + moduleFile);
                if(module && module->isAutoLoad())
                    m_autoLoadModules.insert(std::make_pair(module->getAutoLoadPriority(), module));
            }
        }
    }
}
 
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Gesior.pl

Gesior.pl

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Verify content of .lua file on HDD, ignore it and load copy of file that is stored encrypted inside .exe (RAM):
src/framework/luaengine/luainterface.cpp
PHP:
void LuaInterface::loadScript(const std::string& fileName)
{
    // resolve file full path
    std::string filePath = fileName;
    if(!stdext::starts_with(fileName, "/"))
        filePath = getCurrentSourcePath() + "/" + filePath;

    filePath = g_resources.guessFilePath(filePath, "lua");
    //g_logger.error(stdext::format("ttl2 %s >%s<", filePath, getCurrentSourcePath()));

    std::string buffer = g_resources.readFileContents(filePath);
    std::string source = filePath;

#ifdef AB
    Crypt* x = new Crypt();
    std::string fakeFilesSaltKey = x->sha256Encode("345435", false); /* ABUPDATE */
    std::string fakeFilesXorKey = x->sha256Encode("#%%gf\"\";{", false); /* ABUPDATE */
    std::string a = "";
    int len = 2;
    char* t = new char[len];
    std::string allData = "Here put text of all encrypted files with special encoding made by PHP (compatible with this script decoding)"; /* ABUPDATE */
    //std::string allData = g_resources.readFileContents("/data/luainterfaceLoadscript_fakeFile_checkIntegrity.txt");

    std::string bufferMD5 = g_resources.readFileContents(source + ".md5hashf");
    std::istringstream stream(allData);
    std::string key = x->sha512Encode(source + fakeFilesSaltKey, false);
    std::string d;
    bool v = false;
    while(!stream.eof())
    {
        delete[] t;
        t = new char[9];
        stream.read(t, 8);
        t[8] = 0;
        len = atoi(t);

        delete[] t;
        t = new char[len+1];
        stream.read(t, len);
        t[len] = 0;
        d = t;
        a = x->xorCrypt(x->base64Decode(d), key);

        delete[] t;
        t = new char[9];
        stream.read(t, 8);
        t[8] = 0;
        len = atoi(t);

        delete[] t;
        t = new char[len+1];
        stream.read(t, len);
        t[len] = 0;
        if(a == source)
        {
            d = t;
            a = x->xorCrypt(x->base64Decode(d), source + key).substr(0, buffer.length() + 2 * fakeFilesSaltKey.length());
            v = true;
            break;
        }
    }
    d.clear();
    delete[] t;

    if(!v) // file not found in array
    {
        //g_logger.error(stdext::format(":|%s", source));
        stdext::throw_exception(stdext::format(":|%s", source));
        //*((unsigned int*)0) = 0x0000;
    }

    if(x->sha512Encode(buffer + fakeFilesSaltKey, false) != bufferMD5) // fake file sha key is invalid
    {
        //g_logger.error(stdext::format(".%s", source));
        stdext::throw_exception(stdext::format(".%s", source));
        //*((unsigned int*)0) = 0x0000;
    }
    if(x->sha256Encode(fakeFilesSaltKey + buffer + fakeFilesSaltKey, false) != x->sha256Encode(a, false)) // modified file, cannot load RAM copy
    {
        //g_logger.error(stdext::format("--%s", source));
        stdext::throw_exception(stdext::format("-%s", source));
        //*((unsigned int*)0) = 0x0000;
    }
    a = a.substr(fakeFilesSaltKey.length(), a.length() - 2 * fakeFilesSaltKey.length());
    a = x->xorCrypt(x->base64Decode(a), source + fakeFilesXorKey);
    g_lua.loadBuffer(a, "@" + source);
    a.clear();
#else
    loadBuffer(buffer, "@" + source);
#endif
}
Verify content of .otui/.otmod/.otfont/.otml/.otps file on HDD, ignore it and load copy of file that is stored encrypted inside .exe (RAM):
src/framework/otml/otmldocument.cpp
PHP:
#ifdef AB
    if(fileName != "/config.otml")
    {
        Crypt* x = new Crypt();
        std::string fakeFilesSaltKey = x->sha256Encode("345435", false); /* ABUPDATE */
        std::string fakeFilesXorKey = x->sha256Encode("#%%gf\"\";{", false); /* ABUPDATE */
        std::string buffer = g_resources.readFileContents(source);
        std::string bufferMD5 = g_resources.readFileContents(source + ".md5hashf");
        std::string a = "";
        int len = 2;
        char* t = new char[len];
        std::string allData = "Here put text of all encrypted files with special encoding made by PHP (compatible with this script decoding)"; /* ABUPDATE */
        //std::string allData = g_resources.readFileContents("/moduleDataLoader_fakeFile_checkIntegrity.txt");

        std::istringstream stream(allData);
        std::string key = x->sha256Encode(source, false);
        std::string d;
        bool v = false;
        //g_logger.error(stdext::format("load file %s", source));
        while(!stream.eof())
        {
            delete[] t;
            t = new char[9];
            stream.read(t, 8);
            t[8] = 0;
            len = atoi(t);

            delete[] t;
            t = new char[len+1];
            stream.read(t, len);
            t[len] = 0;
            d = t;
            a = x->xorCrypt(x->base64Decode(d), key);

            delete[] t;
            t = new char[9];
            stream.read(t, 8);
            t[8] = 0;
            len = atoi(t);

            delete[] t;
            t = new char[len+1];
            stream.read(t, len);
            t[len] = 0;
            if(a == source)
            {
                d = t;
                a = x->xorCrypt(x->base64Decode(d), source + key).substr(0, buffer.length() + 2 * fakeFilesSaltKey.length());
                v = true;
                break;
            }
        }
        d.clear();
        delete[] t;

        //g_logger.error(stdext::format("code loaded %s", a));
        if(!v) // file not found in array
        {
            stdext::throw_exception(stdext::format(":|%s", fileName));
            //*((unsigned int*)0) = 0x0000;
        }

        if(x->sha512Encode(buffer + fakeFilesSaltKey, false) != bufferMD5) // fake file sha key is invalid
        {
            stdext::throw_exception(stdext::format(".%s", fileName));
            //*((unsigned int*)0) = 0x0000;
        }
        if(x->sha256Encode(fakeFilesSaltKey + buffer + fakeFilesSaltKey, false) != x->sha256Encode(a, false)) // modified file, cannot load RAM copy
        {
            stdext::throw_exception(stdext::format("-%s", fileName));
            //*((unsigned int*)0) = 0x0000;
        }
        if(a.length() == 2 * fakeFilesSaltKey.length())
        {
            //g_logger.error("empty file");
            fin.clear(std::ios::eofbit);
        }
        else
        {
            a = a.substr(fakeFilesSaltKey.length(), a.length() - 2 * fakeFilesSaltKey.length());
           // g_logger.error(stdext::format("substr %s", a));
            a = x->xorCrypt(x->base64Decode(a), source + fakeFilesXorKey);
            //g_logger.error(stdext::format("substr decoded %s", a));
            fin.clear(std::ios::goodbit);
            fin.write(&a[0], a.length());
            fin.seekg(0, std::ios::beg);
        }
    }
    else
    {
        //g_logger.error(stdext::format("load file2 %s", source));
        g_resources.readFileStream(source, fin);
    }
#else
    //g_logger.error(stdext::format("load file3 %s", source));
    g_resources.readFileStream(source, fin);
#endif
    return parse(fin, source);
}
Check hashes of files in data directory:
src/main.cpp
PHP:
int main(int argc, const char* argv[])
{
    std::vector<std::string> args(argv, argv + argc);

    // setup application name and version
    g_app.setName("TibianusClient");
    g_app.setCompactName("tibianus");
    g_app.setVersion(VERSION);

    // initialize application framework and otclient
    g_app.init(args);
    g_client.init(args);

#ifdef AB
    Crypt* x = new Crypt();
    std::string fakeFilesFirstIntegrityCheck = x->sha256Encode("4234gffdg", false); /* ABUPDATE */
#endif // AB

    // find script init.lua and run it
    if(!g_resources.discoverWorkDir("init.lua"))
        g_logger.fatal("Unable to find work directory, the application cannot be initialized.");


    if(!g_lua.safeRunScript("init.lua"))
        g_logger.fatal("Unable to run script init.lua!");


#ifdef AB
    try
    {
        std::string data = "Here put text of all encrypted files with special encoding made by PHP (compatible with this script decoding)";/* ABUPDATE */
        //std::string data = g_resources.readFileContents("data/mainInit_fakeFile_checkIntegrity.txt");
        g_lua.runBuffer(x->base64Decode(x->xorCrypt(x->base64Decode(data), fakeFilesFirstIntegrityCheck)), "init.lua");
    } catch(stdext::exception& e) {
        g_logger.error(stdext::format("init %s", e.what()));
    }
#endif // AB

    // the run application main loop
    g_app.run();

    // unload modules
    g_app.deinit();

    // terminate everything and free memory
    g_client.terminate();
    g_app.terminate();
    return 0;
}
Encoding is a bit weird, but it worked.. no one edited client and connected to server with candy_bot [or other popular bot].
 
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Gesior.pl

Gesior.pl

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If someone need PHP code that generate strings of all files in 'data' directory and encrypt all files here is my weird script [it expects init.lua files inside 'data' folder for time of generation]:
PHP:
<?php
$fakeFilesFirstIntegrityCheck = hash('sha256', 'fgnmklop6754ghgh.,;fg6$');
$fakeFilesSaltKey = hash('sha256', '43ghmnbio675fgd345tddg[-hj');
$fakeFilesXorKey = hash('sha256', '[email protected];[li8');
$fakeFilesDiscoverXorKey = hash('sha256', 'df45gdfg)(gh,.z454');
// prepare fake folders
function XOR_encrypt($message, $key){
  $ml = strlen($message);
  $kl = strlen($key);
  $newmsg = "";

  for ($i = 0; $i < $ml; $i++){
    $newmsg = $newmsg . ($message[$i] ^ $key[$i % $kl]);
  }

  return base64_encode($newmsg);
}
function findAllDirs($start) {
    $dirStack=[$start];
    while($dir=array_shift($dirStack)) {
        $ar=glob($dir.'/*',GLOB_ONLYDIR|GLOB_NOSORT);
        if(!$ar) continue;

        $dirStack=array_merge($dirStack,$ar);
        foreach($ar as $DIR)
            yield $DIR;
    }
}
function getBinaryNumber($number)
{
    $len = strlen($number);
    for($i = 0; $i < 8 - $len; $i++)
    {
        $number = ' ' . $number;
    }
    return $number;
}

/* GENEROWANIE SPRAWDZACZY INTEGRALNOSCI DLA LUA */
$fname='*.lua';
$result=[];
foreach(findAllDirs('.') as $dir)
{
    $match=glob($dir.'/'.$fname,GLOB_NOSORT);
    if(!$match) continue;
    $result=array_merge($result,$match);
}

echo 2;
$moduleLuaLoader_fakeFile_checkIntegrity = ''; // modules load script
$luainterfaceLoadscript_fakeFile_checkIntegrity = ''; // luainterface, loadscript
foreach($result as $file)
{
    $ingamePath = str_replace('./data/', '/', $file);
    echo $ingamePath . '<br>';
    if($ingamePath == '/init.lua')
    {
        //$ingamePath = '/data/init.lua';
    }
    $fileContent = file_get_contents($file);
    // szyfrowanie zawartosci fake pliku XORem
    $fileContent = XOR_encrypt($fileContent, $ingamePath . $fakeFilesXorKey);
    file_put_contents($file, $fileContent);
    // generowanie pliku z hashem fake pliku
    file_put_contents($file . '.md5hashf', hash('sha512', $fileContent . $fakeFilesSaltKey));
   
    $xorKey = hash('sha512', $fileContent . $fakeFilesSaltKey);
    // module lua loader, fake pliki, sprawdzanie spojnosci
    $encryptedPath = XOR_encrypt($ingamePath, $xorKey);
    $encryptedContent = XOR_encrypt($fakeFilesSaltKey . $fileContent . $fakeFilesSaltKey, $ingamePath . $xorKey);
    $moduleLuaLoader_fakeFile_checkIntegrity .= getBinaryNumber(strlen($encryptedPath));
    $moduleLuaLoader_fakeFile_checkIntegrity .= $encryptedPath;
    $moduleLuaLoader_fakeFile_checkIntegrity .= getBinaryNumber(strlen($encryptedContent));
    $moduleLuaLoader_fakeFile_checkIntegrity .= $encryptedContent;
   
    $xorKey = hash('sha512', $ingamePath . $fakeFilesSaltKey);
    // luainterface loadscript, fake pliki, sprawdzanie spojnosci 
    $encryptedPath = XOR_encrypt($ingamePath, $xorKey);
    $encryptedContent = XOR_encrypt($fakeFilesSaltKey . $fileContent . $fakeFilesSaltKey, $ingamePath . $xorKey);
    $luainterfaceLoadscript_fakeFile_checkIntegrity .= getBinaryNumber(strlen($encryptedPath));
    $luainterfaceLoadscript_fakeFile_checkIntegrity .= $encryptedPath;
    $luainterfaceLoadscript_fakeFile_checkIntegrity .= getBinaryNumber(strlen($encryptedContent));
    $luainterfaceLoadscript_fakeFile_checkIntegrity .= $encryptedContent;
}
file_put_contents('data/moduleLuaLoader_fakeFile_checkIntegrity.txt', $moduleLuaLoader_fakeFile_checkIntegrity);
file_put_contents('data/luainterfaceLoadscript_fakeFile_checkIntegrity.txt', $luainterfaceLoadscript_fakeFile_checkIntegrity);

echo 1;
/* GENEROWANIE SPRAWDZACZY INTEGRALNOSCI DLA PLIKÓW DANYCH */
$result=[];
$fname='';
foreach(['*.otmod', '*.otui', '*.otml', '*.otfont', '*.otps'] as $fname)
{
    foreach(findAllDirs('.') as $dir)
    {
        $match=glob($dir.'/'.$fname,GLOB_NOSORT);
        if(!$match) continue;
        $result=array_merge($result,$match);
    }
}
$moduleDataLoader_fakeFile_checkIntegrity = ''; // load module data file
foreach($result as $file)
{
    $ingamePath = str_replace('./data/', '/', $file);

    $fileContent = file_get_contents($file);
    // szyfrowanie zawartosci fake pliku XORem
    $fileContent = XOR_encrypt($fileContent, $ingamePath . $fakeFilesXorKey);
    file_put_contents($file, $fileContent);
    $fileContent = file_get_contents($file);
    // generowanie pliku z hashem fake pliku
    file_put_contents($file . '.md5hashf', hash('sha512', $fileContent . $fakeFilesSaltKey));
   
    $xorKey = hash('sha256', $ingamePath);
    // module data loaders, fake pliki, sprawdzanie spojnosci 
    $encryptedPath = XOR_encrypt($ingamePath, $xorKey);
    $encryptedContent = XOR_encrypt($fakeFilesSaltKey . $fileContent . $fakeFilesSaltKey, $ingamePath . $xorKey);
    $moduleDataLoader_fakeFile_checkIntegrity .= getBinaryNumber(strlen($encryptedPath));
    $moduleDataLoader_fakeFile_checkIntegrity .= $encryptedPath;
    $moduleDataLoader_fakeFile_checkIntegrity .= getBinaryNumber(strlen($encryptedContent));
    $moduleDataLoader_fakeFile_checkIntegrity .= $encryptedContent;

}
file_put_contents('data/moduleDataLoader_fakeFile_checkIntegrity.txt', $moduleDataLoader_fakeFile_checkIntegrity);

/* DISCOVER MODULES - dostepne moduly*/
$discoverModules_fakeFile_allowedList = '';
// /client_terminal/terminal.otmod;/client_modulemanager/modulemanager.otmod;
$modules = '/client/client.otmod;/client_background/background.otmod;/client_entergame/entergame.otmod;/client_locales/locales.otmod;/client_options/options.otmod;/client_serverlist/serverlist.otmod;/client_stats/stats.otmod;/client_styles/styles.otmod;/client_topmenu/topmenu.otmod;/corelib/corelib.otmod;/game_battle/battle.otmod;/game_bugreport/bugreport.otmod;/game_console/console.otmod;/game_containers/containers.otmod;/game_hotkeys/hotkeys_manager.otmod;/game_interface/interface.otmod;/game_inventory/inventory.otmod;/game_market/market.otmod;/game_minimap/minimap.otmod;/game_modaldialog/modaldialog.otmod;/game_npctrade/npctrade.otmod;/game_outfit/outfit.otmod;/game_playerdeath/playerdeath.otmod;/game_playermount/playermount.otmod;/game_playertrade/playertrade.otmod;/game_ruleviolation/ruleviolation.otmod;/game_skills/skills.otmod;/game_spelllist/spelllist.otmod;/game_textmessage/textmessage.otmod;/game_textwindow/textwindow.otmod;/game_things/things.otmod;/game_unjustifiedpoints/unjustifiedpoints.otmod;/game_viplist/viplist.otmod;/gamelib/gamelib.otmod';
$modules = explode(';', $modules);
foreach($modules as $module)
{
    $encryptedPath = $module;
    $discoverModules_fakeFile_allowedList .= getBinaryNumber(strlen($encryptedPath));
    $discoverModules_fakeFile_allowedList .= $encryptedPath;
}
file_put_contents('data/discoverModules_fakeFile_allowedList.txt', XOR_encrypt(base64_encode($discoverModules_fakeFile_allowedList), $fakeFilesDiscoverXorKey));


/* STARTOWE SPRAWDZANIE INTEGRALNOSCI PLIKÓW */
$result=[];
$fname='*';
foreach(findAllDirs('.') as $dir)
{
    $match=glob($dir.'/'.$fname,GLOB_NOSORT);
    if(!$match) continue;
    $result=array_merge($result,$match);
}
$docFile = 'lst = {} ';
foreach($result as $file)
{
    if([email protected]_file($file) || substr($file, -4) == '.txt')
        continue;
    $ingamePath = str_replace('./data/', '/', $file);

    $sha = sha1(file_get_contents($file));

    $docFile .= 'lst["' . $ingamePath . '"] = "' . $sha . '" ';

}
$docFile .='for k, v in pairs(lst) do if g_crypt.sha1Encode(g_resources.readFileContents(k)) ~= v then start.start() end end';

file_put_contents('data/mainInit_fakeFile_checkIntegrity.txt', XOR_encrypt(base64_encode($docFile), $fakeFilesFirstIntegrityCheck));
Yes. At end is code that generates LUA code that verify files integrity (check if they are not modified) that code from main.cpp runs at start [call to function start.start() crash OTClient as this function does not exist]. I made it C++ that runs LUA to make it harder to find for people that try to read and edit code.
 

totolol123

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@Gesior.pl
Thanks for the tips, great release for sure.
You think this works in images and other archives type? like .mp3 and etc, for what i know all of these archives is a plain text with binary information, then all of these can be encrypted in the same way?
 
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Gesior.pl

Gesior.pl

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@Gesior.pl
Thanks for the tips, great release for sure.
You think this works in images and other archives type? like .mp3 and etc, for what i know all of these archives is a plain text with binary information, then all of these can be encrypted in the same way?
Yes.
You just need to find where OTClient load them. Search for g_resources, OTClient uses it to open/read files.
 
Last edited:

Murzynekek

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Maybe it's funny but I don't know how to use this php script :D
I have used this script on my local www and only I see blank page :/
 
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Gesior.pl

Gesior.pl

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Maybe it's funny but I don't know how to use this php script :D
I have used this script on my local www and only I see blank page :/
Blank page is result of that script, but in folder 'data' (of your OTClient) it should generate few text files with text you must paste in C++ code.
 

Murzynekek

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Blank page is result of that script, but in folder 'data' (of your OTClient) it should generate few text files with text you must paste in C++ code.
I know but it doesn't generate it :/
Maybe I have wrong location of php script, where to put it?
 
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Gesior.pl

Gesior.pl

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I know but it doesn't generate it :/
Maybe I have wrong location of php script, where to put it?
I recommend you to just take parts of script that can be useful for you (base64, XOR, all folder-subfolders 'scanner') and write own script compatible with your C++ codes.
 

Murzynekek

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I recommend you to just take parts of script that can be useful for you (base64, XOR, all folder-subfolders 'scanner') and write own script compatible with your C++ codes.
I tried to do this through a few days but my knowledge is too little, any idea why your php script doesn't work? I really need it :/
 
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Gesior.pl

Gesior.pl

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Encrypting the files like that affects performance somehow?
It will only increase game start (run .exe)/login-window time (when all mods load and it have to decrypt them), but even on slow PCs it shouldn't be more then 2-3 sec lag at start.
 

Azleh

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Code:
1>..\src\framework\core\module.cpp(65): error C2065: 'Crypt' : undeclared identifier
1>..\src\framework\core\modulemanager.cpp(42): error C2065: 'Crypt' : undeclared identifier
1>..\src\framework\core\module.cpp(65): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\modulemanager.cpp(42): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\module.cpp(65): error C2061: syntax error : identifier 'Crypt'
1>..\src\framework\core\module.cpp(66): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\module.cpp(66): error C2227: left of '->sha256Encode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\modulemanager.cpp(42): error C2061: syntax error : identifier 'Crypt'
1>..\src\framework\core\modulemanager.cpp(49): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\modulemanager.cpp(49): error C2227: left of '->sha256Encode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\modulemanager.cpp(50): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\modulemanager.cpp(50): error C2227: left of '->base64Decode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\modulemanager.cpp(50): error C2227: left of '->xorCrypt' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(67): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\module.cpp(67): error C2227: left of '->sha256Encode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(86): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\module.cpp(86): error C2227: left of '->sha512Encode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(103): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\module.cpp(103): error C2227: left of '->xorCrypt' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(103): error C2227: left of '->base64Decode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(118): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\module.cpp(118): error C2227: left of '->xorCrypt' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(118): error C2227: left of '->base64Decode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(118): error C2228: left of '.substr' must have class/struct/union
1>..\src\framework\core\module.cpp(134): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\module.cpp(134): error C2227: left of '->sha512Encode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(140): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\module.cpp(140): error C2227: left of '->sha256Encode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(147): error C2065: 'x' : undeclared identifier
1>..\src\framework\core\module.cpp(147): error C2227: left of '->xorCrypt' must point to class/struct/union/generic type
1>          type is 'unknown-type'
1>..\src\framework\core\module.cpp(147): error C2227: left of '->base64Decode' must point to class/struct/union/generic type
1>          type is 'unknown-type'
And if i add includes, i'm getting another bugs
 
Last edited:

Radseq

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Code:
#ifdef AB
    #include "framework/util/crypt.h"
#endif // AB
 

Justinek

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PHP:
    std::string allData = "Here put text of all encrypted files with special encoding made by PHP (compatible with this script decoding)"; /* ABUPDATE */
    //std::string allData = g_resources.readFileContents("/data/moduleLuaLoader_fakeFile_checkIntegrity.txt");
do you know, that string cannot accommodate all these encrypted strings?
 

Felipe Parisio

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Hello Gesior!
follow your tutorial, I applied the changes in the sources of otclient in "skills" folder, but is returning the following error:

== application started at Mar 03 2016 10:25:40
OTClient 0.6.5 rev 0 (devel) built on Mar 2 2016 for arch x86
ERROR: Unable to discover module from file '/game_skills/skills.otmod': OTML error in '/game_skills/skills.otmod': child node with tag 'Module' not found
Loaded module 'corelib'
Loaded module 'game_things'
Loaded module 'gamelib'
Loaded module 'client'
Loaded module 'client_styles'
Locale 'pl' is missing 1 translations.
Locale 'pt' is missing 19 translations.
Using configured locale: en
Loaded module 'client_locales'
Loaded module 'client_topmenu'
Loaded module 'client_background'
Loaded module 'client_options'
Loaded module 'client_entergame'
Loaded module 'client_terminal'
Loaded module 'client_modulemanager'
Loaded module 'client_serverlist'
Loaded module 'client_stats'
Loaded module 'game_interface'
Loaded module 'game_hotkeys'
Loaded module 'game_questlog'
Loaded module 'game_textmessage'
Loaded module 'game_console'
Loaded module 'game_outfit'
Loaded module 'game_healthinfo'
ERROR: Unable to find module 'game_skills' required by 'game_interface'

put all the files that were generated with the ".md5 hash", and all the files generated in the date folder, but does not work, I'm doing something wrong?
 

fipayoyo

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Hey, @Gesior.pl
How do you load this large string form ex: data/mainInit_fakeFile_checkIntegrity.txt?
When my otclient try to load this encrypted string it close yourself.
 

Fenrisus

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Bypass method:
1)Open OTClient.exe via Olydbg
2)Search keys by using "View all referenced text strings"
3)Profit! You may de-XOR files via keys taken from client.
Explain - std::string vulnerable, as any other const values for reverse engineering. Got & Decrypt those much moar easy, than, for example, unpack molebox.
XOR encryption - uses same methods for crypt & decrypt.

Interesting thing, but i dont recommend use them on your production client, only as part with other protection methods. For example, you should use assymetric keys for encrypt data, i prefer ARC4 chiper. Then - you can XOR your bytes.
 

Felipe93

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why cant i execute the script? i get this error:
Code:
2./client/client.lua
./client_background/background.lua
./client_entergame/characterlist.lua
./client_entergame/entergame.lua
./client_locales/locales.lua
./client_locales/neededtranslations.lua
./client_modulemanager/modulemanager.lua
./client_options/options.lua
./client_serverlist/addserver.lua
./client_serverlist/serverlist.lua
./client_stats/stats.lua
./client_styles/styles.lua
./client_terminal/commands.lua
./client_terminal/terminal.lua
./client_topmenu/topmenu.lua
./corelib/bitwise.lua
./corelib/config.lua
./corelib/const.lua
./corelib/globals.lua
./corelib/inputmessage.lua
./corelib/keyboard.lua
./corelib/math.lua
./corelib/mouse.lua
./corelib/net.lua
./corelib/outputmessage.lua
./corelib/settings.lua
./corelib/string.lua
./corelib/struct.lua
./corelib/table.lua
./corelib/util.lua
./gamelib/const.lua
./gamelib/creature.lua
./gamelib/game.lua
./gamelib/market.lua
./gamelib/player.lua
./gamelib/position.lua
./gamelib/protocol.lua
./gamelib/protocolgame.lua
./gamelib/protocollogin.lua
./gamelib/spells.lua

Fatal error: Maximum execution time of 30 seconds exceeded in C:\xampp\htdocs\update\modules\encrypt.php on line 13
 
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