Use encrypted assembly in C# application

问题

I am trying to protect dlls I'm using in my WPF application from a simple copy. My solution is to encrypt the code section of these dlls and decrypt when it loads into my application.

There is a working way to do that using Assembly:

       using (FileStream fs = new FileStream(@"Mydll.dll", FileMode.Open, FileAccess.Read))
        {
            byte[] file = new byte[fs.Length];
            fs.Read(file, 0, (int) fs.Length);
            assemblyCashCode = Assembly.Load(file);
            Type[] types = assemblyCashCode.GetExportedTypes();

            Type t = MainWindow.assemblyCashCode.GetType("MyClass");
            MethodInfo[] mi = t.GetMethods();
            TypeInfo ti = t.GetTypeInfo();
            object cc = assemblyCashCode.CreateInstance("MyClass");
            int i = (int) t.InvokeMember("M3", BindingFlags.InvokeMethod, null, cc, null);
        }

But I will need to use the CreateInstance and InvokeMember methods every time I want to work with an object from this dll. It is a terrible perspective, isn't it?

Is there another way to load these dlls instead of the CLR loader? Or just make the previous way easier?

回答1:

Yes, implement the AppDomain.AssemblyResolve event.

This event is fired when assembly resolution fails (you would need to store your assemblies somewhere assembly resolution won't find them), and then you can say "oh, here it is" after having loaded and decrypted it.

来源：https://stackoverflow.com/questions/32090099/use-encrypted-assembly-in-c-sharp-application