Key0x24 troubles

[d0k3]

http://gbatemp.net/threads/download-decrypt9-open-source-decryption-tools-wip.388831/page-221#post-7329881

This in essence means that key 0x24 is no more set up the way it was before (aka the way the system expects it). While the keyX is set by bootrom, keyY is set by NATIVE_FIRM. The handling is correct on N3DS (meaning you most likely set the keyY according to P9 I know that the key is also in P9, but I'm unsure how it is set on O3DS consoles).

[d0k3]

Might be user error: http://gbatemp.net/threads/download-decrypt9-open-source-decryption-tools-wip.388831/page-221#post-7330199 I'll find out more about it, and eventually close this

[ozesnoloco]

I can provide info if needed in order to discard any user error

[d0k3]

So... you had the same issure? Can you describe what you encountered?

[ozesnoloco]

Yes. As the user on the gbatemp post says, I encounter a message when I try to dump a gbc vc game: WARNING: current CMAC does not match. I updated my N3DSXL from arm9loaderhax to boot9strap. I'm using Luma 7.5. The message is displayed no matter what game save I try to dump, but still, I can dump correctly the save, exported as gbavc.sav on the root of my SD card. If I imported it with VBA emulator, make a change and saving the game, those changes are still in effect on the .sav file, but if I inject that file on my 3DS, even if I receive the message "Injection succedded", those changes are not reflected on the game itself, showing, in return, the same save game that I dumped

[d0k3]

@SciresM: this means that key0x24y (/x?) used by the system is different from the one boot9strap sets. I'll doublecheck the GM9 source, but I'm pretty sure that issue is not in there.

[d0k3]

@ozesnoloco - can you get a good aeskeydb.bin, one that contains 0x24y, put that in your SD root and try again?

[ozesnoloco]

@d0k3 I can try to redownload my 0x24y and build the aeskeydb.bin with Decrypt9... that will work?

[d0k3]

You can also just provide slotx0x24keyY.bin

[ozesnoloco]

Ok... I put the Slot0x24keyY.bin in the root of my SD, tried again to inject but I have the same result than before

[ozesnoloco]

Can I help you more to solve this?

[d0k3]

Okay... only reason I can think about, key0x24Y is set up in a different way via boot9strap + Luma than it is was earlier, via just a9lh + Luma.

I've got on more thing to try, @ozesnoloco . Remove / rename all aeskeydb.bin / slot0x??key?.bin you've got, then try again.

[ozesnoloco]

@d0k3 : I did as you suggest: remove all slot0x??key?.bin and tried again, but this time, dumping or injecting was not possible because Decrypt9 ask for slot 0x24keyY.bin. If I put it back on SD root, same result as before... Same "WARNING: current CMAC does not match.", same "Injection succedded" message after injection and still, changes on the save are not reflected on game. If I try with Godmode9, I need to trimm my save file, because the one VBA generate is 64kb. After trimming, I can paste the file on [S]:SYSNAND, but it seems to happend like Decrypt9... injection seems to be successful, but the game does not reflect any change at all.

[trbocode]

Works fine on N3DS with and without the aeskeydb.bin file using GM9

[ozesnoloco]

@trbocode : But If I try to paste a 64kb file on [S]:SYSNAND, a message says there is no space, and if I trimm it, changes doesn´t reflect. With Decrypt9, I still got the"CMAC does not match" and even when Decrypt9 says the injection is successful, it is not reflected on the actual game

[d0k3]

Okay, let's try to get behind this, shall we?

@trbocode - is this on sighax / boot9strap?

@ozesnoloco:

• This is a N3DS, right?
• The gbasav.vc file turns up in your S: drive, right? And it has the correct size?
• You get: "WARNING: current CMAC does not match" - when exactly does that warning pop up? What did you do before you got this?
• If you try to write gbacv.sav there (same says as the file already there?), then leave and reenter the directory, is the gbavc.sav file still there?

[ozesnoloco]

@d0k3 :

• Yes, it is a N3DSXL
• When I dump the file, it turns up un muy S: drive, as gbavc.sav, 32kb, using Godmode9
• The WARNING appears when I try to dump a save file using Decrypt9, when I select "GBA VC Save Dump". First, I turn on my 3DS, launch the gane I want to dump/inject, wait until save is loaded, exit the game and then, I enter System Settings and launch Decrypt9. From there, I try to dump the save and that's when I get the WARNING. But as I say before, even with the WARNING message, save file is successfuly dumped, medio gbavc.sav un the SD root. I have to do do the same steps as described to inject a game, but even when Decrypt9 says the injection was successful, when I launch the GBA game, it loads the previous save file, not the one I inject.
• Yes, if I exit and reenter the directory, gbavc.sav is still there, if I understood you correctly.

By the way...

https://github.com/d0k3/Decrypt9WIP/issues/138

User greenDarkness commented on 29 Dec 2016 the exact same problem I have (third comment)

[d0k3]

Wait, you launch D9 via MSET, did I get that right? Why not use boot9strap?

Anyways, what about the injection in GM9, does that work for? If you copy gbavc.sav to S;/, is the file still in the directory upon leave and reenter?

[ozesnoloco]

@d0k3 : Well... I enter and exit System Settings to enter GM9 because I don´t know another way to do it without turning off my console.

Something odd happen with the injection using GM9. First, I dumped, edited and trimmed a Castlevania Aria of Sorrow save (trimmed because if I try to paste the 64kb file, GM9 says the file is larger than space available and fail to paste in S:/). I copy and paste that gbavc.sav file 3 or 4 times for... you know... only to be sure. After launching again the game, the changes are reflected .

After that, I try to do the same thing, using the same steps with Castlevania Harmony of Dissonance, but when I launch the game after the injection, the changes are not reflected on the actual game.

[d0k3]

Alright. You should really run GM9 via the Luma chainloader, or any other way directly from boot9strap. These old entrypoints will be deprecated soon. There will be, however, a method of running GM9 via a shortcut from your home menu (which will actually reboot the console).

Anyways, this is not really a boot9strap issue, as I initially suspected. @SciresM - I'm closing this now.

@ozesnoloco - the file is displayed as 64kB, but you can't inject 32kB, is that correct? Please try the most recent GodMode9 hourly, but run it via the Luma chainloader: https://transfer.sh/W4I8N/GodMode9-20170531-220019.zip

If the problems persist, open an issue over at the GM9 repo.