Question about how to obtain decryption key for UE4 title.

[KaktoR]

AES finder
https://zenhax.com/viewtopic.php?f=9...p=56251#p56251

[L33THAK0R]

Originally Posted by KaktoR

AES finder
https://zenhax.com/viewtopic.php?f=9...p=56251#p56251

cheers man, you're a lifesaver! Real quick is it possible for some titles to not be encrypted? Chernobylite, when scanned with the AES finder app gives a "key.txt" output of "key not found, archives are probably not encrypted". Is it possible that the version of UE4 the title runs on isn't supported by the application? I only ask as it takes a fair while for my poor CPU to compress larger games (this one's a whopping 32gb!), and I'd rather not go through the pain again of finding my .arc file is useless. Thank you so much for that resource, it's honestly an incredible little tool!

[Joe Forster/STA]

Originally Posted by L33THAK0R

Chernobylite, when scanned with the AES finder app gives a "key.txt" output of "key not found, archives are probably not encrypted".

I can confirm this, with AES finder 0.9f. The .pak files do seem to be encrypted, though. Yes, probably AES finder doesn't support this game (yet).

[L33THAK0R]

Originally Posted by Joe Forster/STA

I can confirm this, with AES finder 0.9f. The .pak files do seem to be encrypted, though. Yes, probably AES finder doesn't support this game (yet).

Thank you for confirming Joe, thankfully there are many more UE4 games for me to try my hand at compressing! Fingers crossed a future version supports this title!

[Joe Forster/STA]

Originally Posted by L33THAK0R

there are many more UE4 games for me to try my hand at compressing!

Do you have one for which AES finder can find the key? (I think it will find keys in 32-bit executables only.)

[L33THAK0R]

Originally Posted by Joe Forster/STA

Do you have one for which AES finder can find the key? (I think it will find keys in 32-bit executables only.)

"Samurai Jack - Battle Through Time" which has the file name "SJGAME-Win64-Shipping.exe", (which I'm thinking is a 64-bit executable) generates the key "0x8E0A631576F6CBE340BF039C7C5BB8632E6FDC1082E019B 646B44B2846C96855". Currently attempting to compress some other games right now but I'll be sure to give it a shot in the coming days. Tried getting a key from the game "Satisfactory", but I'm having issues unpacking it with steamless, might ask over on the cs forums for help with that though, as I don't think its relevant here.

[Joe Forster/STA]

According to this utility: UnrealPak, Chernobylite's files are not encrypted, only compressed (with ZLib). I could list and extract the contents of any of the PAK's. If I understand correctly, you have to specify the AES key in the "Crypto.json" file of this utility to be able to decrypt files; if the PAK "index" is also encrypted, you won't even be able to list the files inside without the proper key. So I think AES finder was right: there's no key in this game.

This also means that you won't be able to significantly compress the game as it is further because it's already compressed, unless you extract everything from all the PAK's. [...] I tried it: Chernobylite works fine it this unpacked form - I could load the last savegame in the base and start a mission - and the (unpacked) files don't seem to be encrypted. (You can't compress encrypted files much anyway.) I extracted the PAK's in this order: 0, 1, 3, 3optional, ..., 9, 10, ..., 15. About 124 thousand files, 40.6 gigabytes. The "ChernobylGame" and "Engine" directories extracted from the PAK's go to the root directory of the game, all other directories go under "ChernobylGame\Content".

Can you confirm that you cannot list of extract files from "Samurai Jack - Battle Through Time" with the same utility? Without explicitly specifying the AES key, that is.