ROM Hack Question How to view ROM info

[nitro322]

(This may not be the best forum to ask, but I couldn't find anything more obvious. Please feel free to move if appropriate.)

I have what I think should be a simple question - how to view details about a switch ROM, whether XCI or NSP? Basically, how to view the title id, name, version, required system version, etc. I'd figure hactool could do that pretty easily, but I just get this:

$ hactool --disablekeywarns -i -t xci Cave\ Story+.xci

XCI:
Magic:                              HEAD
Header Signature:                   374AA94DAFD71256203D65ACFAB44A15B1A98A183D8A136AA5123F176C16952A
                                    3FB3D3AEB3B2F534B2ABA73E1F972EED85FCD73DE424A48B98D7355B415CA032
                                    ADB86616490353358E74052F61517481FE4C36A646140ED7734FE168919A429F
                                    8C0250B3089CB50BAF1BB9A6BACD843FCD6D397130418D5C030F7B1BC5865643
                                    58BE215A80BD032FE57621E4F50E5BD4723DDBE77183AF52C5839B1B392AAD1A
                                    BDCA0F33B67575ED81190DAEF8C166D762D0E67CACD17D97461273A43AEEC9FD
                                    C0A715D9103DC9E1BA2579158191596266D5656A5F9052892D03FA33B363CC99
                                    9F5DE1EBC0910A3527A51D294C6D09A0D5FB3D2AA2C21315629E8EF6B139B5AE
Cartridge Type:                     2GB
Cartridge Size:                     000020797c00
Header IV:                          7B4C55FF475D871368AFC56A76C05BBE
Encrypted Header:                   2B21AA2E41CBC29E8A7D1415646FE07CF2D8C0C07E62BD2F2C8AD97A1D1267C1
                                    F54592F13181B0AC4B68158DB5080B58B0E73B98ABD82A2418171EC257825FD9
                                    4E270DDC96250853CC5818E871FD26DCC3740A9E5A4CA1F153EBC96077CA4521
                                    874B12607E7B870C11A9BC1A40B9FF17
Encrypted Header Data:
    Compatibility Type:             Global
Root Partition:
    Magic:                          HFS0
    Offset:                         00000000f000
    Number of files:                3
    Files:                          rootpt:/update                                           000000000000-000017ff0000
                                    rootpt:/normal                                           000017ff0000-000018022000
                                    rootpt:/secure                                           000018028e00-000020788a00
Update Partition:
    Magic:                          HFS0
    Offset:                         00000000f200
    Number of files:                167
Normal Partition:
    Magic:                          HFS0
    Offset:                         000017fff200
    Number of files:                2
    Files:                          normal:/d33d01630cf1282b3869d0c8c04a278d.nca             000000000000-000000030e00
                                    normal:/2d9121fedb032265233c3082c24e5060.cnmt.nca        000000030e00-000000031e00
Secure Partition:
    Magic:                          HFS0
    Offset:                         000018038000
    Number of files:                4
    Files:                          secure:/97e31c6e7b60b1effcc89f6bc608e9b6.nca             000000000000-00000870c000
                                    secure:/d33d01630cf1282b3869d0c8c04a278d.nca             00000870c000-00000873ce00
                                    secure:/50fe36bd0b0e8a71d905f083a83eb474.nca             00000873ce00-00000875ea00
                                    secure:/2d9121fedb032265233c3082c24e5060.cnmt.nca        00000875ea00-00000875fa00
Done!

I'd guess the information I'm looking for is in that Encrypted Header, but I can't for the life of me figure out how to decrypt and view that info.

I know hactool requires a keystore. I have the keys from my switch dumped and saved to ~/.switch/prod.keys, and I can use hactool to decrypt and unpack ROM files successfully with, eg., the following:

hactool -x -t xci --securedir="Cave Story+" "Cave Story+.xci"
hactool -x -t nca --romfsdir="Cave Story+/romfs "Cave Story+/97e31c6e7b60b1effcc89f6bc608e9b6.nca.ncz"

So, I know my keys work. There's also a utility called NX_Game_Info that prints out basically the exact info I'm looking for:

$ mono ~/1/NX.Game.Info_0.7.1_cli/nxgameinfo_cli.exe Cave\ Story+.xci
NX Game Info 0.7.1.0
Copyright ©  2018-2019 Garoxas

Opening file Cave Story+.xci

Cave Story+.xci
├ Title ID: 0100B7D0022EE000
├ Base Title ID: 0100B7D0022EE000
├ Title Name: Cave Story+
├ Display Version: 1.0
├ Version: 0
├ Latest Version:
├ System Update:
├ System Version: 0
├ Application Version:
├ Masterkey: 0 (1.0.0-2.3.0)
├ Title Key:
├ Publisher: Nicalis, Inc
├ Languages: en-US
├ Filename: Cave Story+.xci
├ Filesize: 1.86 GB
├ Type: Base
├ Distribution: Cartridge
├ Structure: Scene
├ Signature: Passed
├ Permission: Safe
└ Error:

1 titles processed

So the data is clearly there. And while NX_Game_Info does nearly everything I want, it requires .NET/mono and I'm trying to run this on a Linux system that doesn't have mono.

Is there any way to have hactool decrypt and print readable header info? or am I barking up the wrong tree here? If the latter, any suggestions on another app similar to NX_Game_Info, but maybe C- or python-based or something similar, that can do the job?

 

[masagrator]

Info is stored in NCA header, not in nsp or xci. For hactool to read it you need to unpack xci/nsp and print info about NCA to get some of info.

But I don't think it prints version and required system version.

 

[BigOnYa]

Not sure if this will help you but it is awesome app for pc. It will list most those things mentioned, and the creator is really nice and availible here also for questions and/or suggestions. If you PM him, he may have a C- or python version to share with you.
https://gbatemp.net/threads/nxfileviewer.583936/

 

[nitro322]

Thanks, masagrator. I actually did try checking out the unpacked NCAs, but I didn't really get much useful info from it, either. I do get Title ID and a couple other semi-interesting attributes, but still not the name or version or almost any other info NX_Game_Info.

I'm less optimistic now about finding an easy answer to this. I figure hactool is capable of decrypting all the relevant information, it just seems to be focused more on unpacking ROMs than displaying info about them.

I actually looked at the NX_Game_Info source to see if I could figure out what it's doing, but my programming knowledge is more on the scripting and automation side of things, so I couldn't make too much sense of it. What's funny (well, to me) is it seems to be using LibHac to do the decryption, which itself seems to basically be a reimplentation of hactool as a .NET library. So again, I have to think it isn't doing anything hactool isn't capable of, but like I said before I guess that just isn't what it's designed for.

If anyone else has any ideas I'm all ears, but not too hopeful at this point.

--------------------- MERGED ---------------------------

Hey, thanks BigOnYa. Looks like they're also using LibHac. Seems to be quite the popular library. :-) Since LibHac is likely doing the heavy lifting, re-implementing wouldn't be very straightforward at all - he'd basically have to rewrite that LibHac library as well. But good to know of another tool out there. Appreciate the suggestion.