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Home » Developing U++ » U++ Developers corner » Considering different approach to Win32 release
Re: Considering different approach to Win32 release [message #45374 is a reply to message #45330] Mon, 02 November 2015 17:17 Go to previous messageGo to previous message
mirek is currently offline  mirek
Messages: 13975
Registered: November 2005
Ultimate Member
OK, so I have digged deep into the protect and found the problem...

...well, the problem is that it cannot work the way it is designed...

double CryptedTest(double d, double e)
{
	PROTECT_START_FUNC(Decrypt);

	double f;
	f = d * e;

	PromptOK("CryptedTest DECRYPTED SUCCESFULLY!!!");
	return 2 * f + e;

	PROTECT_END_FUNC;
}


The problem here is that ProtectEncrypt absolutely ignores any linker fixups. This means that literal string constant in PromptOK gets encrypted 'raw'. Then, when program is run, .exe loader relocates *encrypted data*, and they get decrypted only after relocation, resulting in wrong address (that is why it crashes) and possibly broken decryption.

So, for now, if you need to use Protect, the only code it might be able to handle is the one that does not reference static data or other functions.
 
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