you cannot get the same hash.
(or rather it is very hard to get the same hash https://stackoverflow.com/questions/11603615/ … ifferent-hashes)

The engines don't do RAR or 7ZIP formats, and they've already shipped with the best zip compression they can. If your grand plan is to make them solid compressed, then that's not going to have much benefit other than extremely long load times (had it supported RAR or 7Z).

The problem is I already searched internet and found tools that pack to the same hash, as long as contents of files are not changed.

But in this case I don't just want same hash, I want the original hash.

The file is from etqw demo, pak000.pk4. Maybe it somehow possible to make the engine not check hash, or some other trick?

Perhaps you guys know a method to compress the pk4 itself?

Pak000.pk4 is 132mb, I need it to be 98mb at most, for storage.

7z/rar can compress the un-packed files to 94mb. But they can't compress the pk4 file directly.

Another file I tried to compress instead was the megatexture, which also can't be compressed, though I don't know much about it, perhaps it is already highly compressed.

The hash checks are there as a content anti-cheat.