Markers and project settings

VMProtect
1

Hey there!
I’ve been reading nearly everything here on the site but still didn’t find out whats correct.

So you can set markers like VMProtectBegin etc. and you can use a .MAP file to select functions to protect.

So, if I have a critcal function that I want to protect, is it better to use both, or doesn’t it matter if I use VMProtectBegin or the .MAP file way? (I would prefer .MAP)

A 2nd question that’s nearly the same: If I protect a function with VMProtect, do I still have to encrypt strings with “VMProtectDecryptStringA” ? And, is that a encryptstring function at all, or what does it do?

Thanks in advance!

2

So, if I have a critcal function that I want to protect, is it better to use both, or doesn’t it matter if I use VMProtectBegin or the .MAP file way? (I would prefer .MAP)

The best method is the .MAP file way:
http://vmpsoft.com/support/user-manual/working-with-vmprotect/preparing-a-project/
In any case you can not use both methods.

A 2nd question that’s nearly the same: If I protect a function with VMProtect, do I still have to encrypt strings with “VMProtectDecryptStringA” ? And, is that a encryptstring function at all, or what does it do?

Unfortunately I don`t understand you. About VMProtectDecryptStringA you can read the user manual:
http://vmpsoft.com/support/user-manual/working-with-vmprotect/preparing-a-project/sdk-functions/#VMProtectDecryptStringA

3

Hey, thanks for clearing this out!

VMProtectDecryptStringA function allows to decrypt ANSI string constant. You have to add this constant to a list of protected objects.

I don’t understand the sense of this function, do I actually pass a already encrypted string to the function, or do I just have to pass any string I want to be encrypted to the function?
Anyway, the key question: If the string is in a protected function already, do I still need to use “VMProtectDecryptStringA” to have the string encrypted, or does VMProtect automaticly do it?

4

There is the example of usage:

 MessageBox(hDlg, VMProtectDecryptStringA("Incorrect password"), "Error", MB_ICONERROR + MB_OK);

After compilation in VMProtect the string “Incorrect password” will be encrypted but VMProtectDecryptStringA will return the original string.

5

Thanks, so I still need to encrypt the strings with “VMProtectDecryptStringA”, even if the function where the string occurs is protected by VMProtect already?

6

Yes. Because the function and the string are different objects.