1

File.hpp

@@ -0,0 +1,39 @@
+#include <fstream>
+#include <string>
+
+namespace File {
+
+	bool Contain(const char* path, const char* dest) {
+		std::ifstream infile(path, std::ios::in | std::ios::binary | std::ios::ate);
+		size_t size = infile.tellg();
+		infile.seekg(0, std::ios::beg);
+		char* buffer = new char[size];
+		infile.read(buffer, size);
+		infile.close();
+		std::string alltext(buffer, size);
+		delete[] buffer;
+		return alltext.find(dest) != std::string::npos;
+	}
+
+	char* ReadBytes(const char* path) {
+		std::ifstream infile(path, std::ios::in | std::ios::binary | std::ios::ate);
+		size_t size = infile.tellg();
+		infile.seekg(0, std::ios::beg);
+		char* buffer = new char[size];
+		infile.read(buffer, size);
+		infile.close();
+		return buffer;
+	}
+
+	std::string Extract(const char* path, size_t offset, size_t length) {
+		char* buffer = ReadBytes(path);
+		if (buffer) {
+			std::string a(buffer + offset, length);
+			delete[] buffer;
+			return a;
+		}
+		delete[] buffer;
+		return nullptr;
+	}
+
+}

Il2cppEncrtypt.vcxproj

@@ -145,6 +145,7 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClInclude Include="File.hpp" />
     <ClInclude Include="framework.h" />
     <ClInclude Include="Native.h" />
     <ClInclude Include="pch.h" />

Il2cppEncrtypt.vcxproj.filters

@@ -24,6 +24,9 @@
     <ClInclude Include="Native.h">
       <Filter>头文件</Filter>
     </ClInclude>
+    <ClInclude Include="File.hpp">
+      <Filter>头文件</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="dllmain.cpp">

Native.cpp

@@ -9,6 +9,7 @@
 #include <climits>
 #include <sstream>
 #include <direct.h>
+#include "File.hpp"
 using namespace std;
 
 
@@ -43,10 +44,6 @@ bool Contain(const char* path, const char* dest) {
 	return alltext.find(dest) != std::string::npos;
 }
 
-bool CheackUnityVersion(const char* path) {
-	return Contain(path, "2021.3.22f1");
-}
-
 
 //加密混淆核心逻辑
 char* encrtypt_file(char* src, size_t& file_size) {
@@ -158,11 +155,6 @@ void OverrideLoader(char* path) {
 	string dest_loaderCpp = dest + "\\unityLibrary\\src\\main\\Il2CppOutputProject\\IL2CPP\\libil2cpp\\vm\\MetadataLoader.cpp";
 	string dest_memoryMappedFileH = dest + "\\unityLibrary\\src\\main\\Il2CppOutputProject\\IL2CPP\\libil2cpp\\utils\\MemoryMappedFile.h";
 	string dest_memoryMappedFileCpp = dest + "\\unityLibrary\\src\\main\\Il2CppOutputProject\\IL2CPP\\libil2cpp\\utils\\MemoryMappedFile.cpp";
-	string unity_version_file1 = localpath + "\\unityLibrary\\src\\main\\resources\\META-INF\\com.android.games.engine.build_fingerprint";
-	string unity_version_file2 = localpath + "\\unityLibrary\\build\\il2cpp_armeabi-v7a_ReleasePlus\\il2cpp_cache\\buildstate\\bee-inputdata.json";
-	string unity_version_file3 = localpath + "\\unityLibrary\\build\\il2cpp_armeabi-v7a_ReleasePlus\\il2cpp_cache\\buildstate\\bee.dag.json";
-
-
 	if (!file_exist(dest_loaderCpp.c_str()))
 	{
 		Log("error: not found dest loaderCpp");
@@ -178,8 +170,9 @@ void OverrideLoader(char* path) {
 		Log("error: not found dest memoryMapped source file");
 		return;
 	}
-	if (!CheackUnityVersion(unity_version_file1.c_str()) && !CheackUnityVersion(unity_version_file2.c_str()) && !CheackUnityVersion(unity_version_file3.c_str())) {
-		Log("error: unity version err.");
+	if (File::Extract((dest + "\\unityLibrary\\src\\main\\assets\\bin\\Data\\data.unity3d").c_str(), 0x12, 11) != "2021.3.22f1") {
+		//避免不同版本il2cpp源码不同 导致可能能正常跑起来 但是线上会引发崩溃 
+		Log("version erro: must be 2021.3.22f1");
 		return;
 	}
 
@@ -192,12 +185,21 @@ void OverrideLoader(char* path) {
 		workpath = NULL;
 	}
 
+
+	Log("owner: 31games");
+	Log("anchor: https://geek7.blog.csdn.net/");
+	Log("email: [email protected]");
 	Log("override Loader code complete.");
 }
 
 //外部调用
 void EncryptionCode(char* export_android_path)
 {
+	if (NULL == export_android_path || strcmp(export_android_path, "") == 0) {
+		Log("export android path is null: %s", export_android_path);
+		return;
+	}
+
 	//wait input
 	string global_metadata_path = export_android_path;
 	if (NULL == strstr(global_metadata_path.c_str(), "global-metadata.dat")) {