Unable to decrypt Ghost of Tsushima PC files

[Foul-Tarnished]

Describe the bug
Unable to decrypt psarc archives from Ghost of Tsushima Director's Cut (PC version)

Expected behavior
Extract files contained in .psarc archives

Steps To Reproduce

• download PSArcInterface
• .\psarc-cl.exe unpack .\gapack_misc_b.psarc output

error:

PSArc-cl - refs/tags/v1
Failed to synchronize with archive.

[MilchRatchet]

Hi,

thanks for the report. I had a look at this problem and the issue is that this file is actually a "DSAR" file. This seems to be some other form of archive format and I can see that there is a PSArc file contained inside of it. However, the format of that PSArc file seems to deviate from all public documentation and DSAR files are not documented anywhere either. Hence I am afraid that I won't be able to fix this anytime soon.

Could you please remove the file that you uploaded from this report as it might be copyrighted? Thanks.

[Foul-Tarnished]

File removed.

Thanks for the info, sadly I guess we won't get asset modding in GoT soon

[Foul-Tarnished]

FYI, I was able to unpack partially using QuickBMS app
and this psarc.txt "plugin" file psarc.txt
(from https://reshax.com/topic/746-ghost-of-tsushima-pc-psarc-archive/?do=findComment&comment=3421&_rid=2840)

So far, the "bitmaps" psarc archives are full of ".sps" files.
Ever heard of that format ?
bitmaps.zip

Thank you

edit : in a hex editor, all these .sps files start with "XTBS".
Also, their name contain msac extension too (adachi_costume_armor_mlt.msac.m.0.sps, adachi_costume_armor_mlt.msac.ma.0.sps, etc.)