Unreal Engine 4 Decryption Tool
 

Usage:
The key must be in hexadecimal format. Other key formats will not work because there is currently no parser for them yet.

I am not sure if this is universal, I don't have any unreal engine games and I was sent a small sample to work on. Borderlands 3 "pakchunk2-WindowsNoEditor_0_P.pak", seems like it works

Note: This only decrypts, you'll have to find other means of precompressing the data. The input/output size remains the same.

And the legend is back ... :)
Key for Borderlands 3:

Welcome Back My Bro
You Do it
Thanks , i will test it

Awesome, hope we will see the same for RDR2 files :)

Update available

Changes

- Replaced old SHA and AES functions for more optimized ones

Notes

- This is backwards compatible with first release, it's just faster

Thanks for the tool, works OK for BL3. Is it possible to reduce the buffer size? Now it eats >256 MB of RAM on relatively small files? Combined with main algo, srep and xtool it can easily kill all the RAM :)

Update available

Changes

- Fixed minor issues, thanks ShivShubh
- Added chunk size option as requested, its setting is optional

Notes

- This thing does not work like xtool where setting small/big chunk size has little to no difference, if an encrypted stream is truncated, it will not be decrypted
- Make sure the chunk size you use when encoding is the same as the one you set when decoding
- You may also have noticed, the key and chunk size are repeated when encoding and when decoding (the command line), that is because this tool does not store headers of its own to recall this information, which is why I did mention that the input/output size is always the same
- You can input a different key if you plan on reencrypting the data using another key, not sure why you would be doing that though but it is possible :)

Usage
I'm just waiting for the key, I already have plans on how to precompress that game.

anyone have the decryption key for street fighter 5?
i have the aes_binary one but when i go to pack it back up it doesn't work right

Same thing

it crashes on use of aes key

should it work on t7

that is the key i have and i have tried those tools

Use this:If it doesn't works then use in all caps.

trying that now

hmmm caplitlized or not it had no effect

Razor's tool needs update for PAK files that are only encrypted but not compressed.

actually that isn't the issue, the headers slightly differ in some of these games compared to what borderlands 3 had and I lack samples so... :rolleyes:

i'll give you a sample but your inbox is always full

post it here

i shall it will be a zippy share link none of the files are small enough to put here

street fighter 5 tournament editon sample sample
 

street fighter 5 is compressed
tekken 7 isn't but that game is non issue for me i have no problems with it
but when i extract SF5 and pack it back up it.. i end up having only 1 stage and ryu and ken are the only selectable fighters...
it is the only ue4 game i have problems with..
recently i decrypted soul calibur 6 no problems on it either..
i have decrypted many games but this one for some reason does not act right packed back up...

It does not act right after packing because of incorrect file paths or improper files similar to Borderlands 3. If the game can read a modified PAK file then it should have no problem at all unless you have wrong file paths or missing/corrupt files (often caused by BMS script).

indeed it was extracted by a bms script and packed pack up using unrealpack
i have done this with many games SF5 seemes temperamental with it though
i think some kind oc coding ties all the files together.. and when i extract them it messes them up

This is exactly why I use UnrealPak to extract PAK files because thats what its designed to do. BMS is a user-defined script and may go wrong anywhere possible. In one of the PAK files of Borderlands 3, QBMS and UnrealPak extract exactly same amount of files and they were almost exactly same in size (differing only in few bytes). Those few bytes were crashing the entire game.

This is just one reason, another reason is PAK files once extracted are sometimes not in their so called "Cooked" path folders so if you just pack them for use, game will not be able to read the files inside that new PAK file.

i have the unpacker too used it on tekken 7 when i first did it and my fighters were showing up invisible so i used a bms and unreal to pack it and its fine..
i also tried it on street fighter 5.. and it had alot of problems as well although other games it worked perfect on

Update available

Changes

- Fixed minor issues
- Added support for Street Fighter V type of headers

Notes

- The person who asked for Rune II support, well this has a similar format as the other games just minor differences in the header structure therefore a sample from another game which has something similar is required, better if that game also has compressed streams, not just encrypted
- Keys are in hexadecimal, they are not case-sensitive meaning letters can be upper case or lower case, it doesn't make a difference.
- I changed a few things in the source, but then this thing of changing keys for each sample has left not being sure whether the support for borderlands 3 was left unaffected, you may want to check that and compare it to last release

Useful links

Here's a link where you can get keys for some games:
https://www.zenhax.com/viewtopic.php...rt=1160#p51604

using ue4dt+pzlib:

TY Razor
i'm going to test on the entire .pak pak folder content and post inflation results

C:\Users\Wolf\Desktop\ue4dt_R4>del /q data.arc
Could Not Find C:\Users\Wolf\Desktop\ue4dt_R4\data.arc

C:\Users\Wolf\Desktop\ue4dt_R4>arc.exe a -ep1 -r -ed -s; -w.\temp -mue4dt+deflate
data.arc "pack\*"
FreeArc 0.67 (March 15 2014) creating archive: data.arc
Compressing 70 files, 27,092,819,816 bytes. Processed 0.7%
ERROR: write error (disk full?) in compression algorithm ue4dt


C:\Users\Wolf\Desktop\ue4dt_R4>pause
Press any key to continue . . .

hmm..

figure out which pak is causing this and upload it.
if the pak is massive, upload the chunk/section where the program fails.

@razor12911 its probably the 5 gb file the first one

yes of course it is the first 5gb file, I wonder why did I ask for samples in the first place :rolleyes:

i am going to split it into peices using 7 zip and send it

well that folder has 69 individual .pak files in it lol

Compressed 2 files, 2,845,529,487 => 8,213,974,533 bytes. Ratio 288.66%
Compression time: cpu 6.12 sec/real 211.28 sec = 3%. Speed 13.47 mB/s
All OK

this happend after removing 0x from the hexidecimal key

Help a brother out and figure out which chunk is buggy, I couldn't care less about this tool because I don't have any unreal engine games and I wouldn't use it if I had any games that supported it... Too much work

Split the 5gb file into 256mb chunks or lower. Then process each chunks with the tool (ue4dt only) and see which chunk is failing. If multiple chunks are failing then no need to upload all of them. Just upload 1 chunk that fails and share the link here.

will do a little later i have to run errands