[cfe-dev] RE : AST Transformation

[Ruch Grégory]

Thank you for you reply

I want to make AST transformation. My goal is to change the program control flow. One example is controle flow flattening. http://www.inf.u-szeged.hu/~akiss/pub/pdf/laszlo_obfuscating_journal.pdf. But there are many other techniques.
I think that if I can directly build an executable from the modified AST it's interesting. And rebuild the source code also interest me. I want to make harder the reverse engineering.

someone else is he convinced by the idea or not ?

But the question is more technical about Clang. Can we just implement AST transformation plugin and let the normal execution of Clang to build the executable ? I've read that pretty-print do not garantee to get reparsable code, therefore I throught that it will be better to build directly the executable.




________________________________________
De : Sebastian Redl [sebastian.redl at getdesigned.at]
Date d'envoi : mercredi 30 mars 2011 20:01
À : Ruch Grégory
Cc : cfe-dev at cs.uiuc.edu
Objet : Re: [cfe-dev] AST Transformation

On 30.03.2011, at 16:43, Grégory Ruch wrote:

> Hi,
>
> I want to implement a C obfucation tools that makes AST transformations.
> In output I want C source or an executable it's not important.

There's no point in obfuscating C code if you're going to output an executable. The optimizers are effectively obfuscators, and they make your code run faster while they're at it, too.

Sebastian