[3DS] DGS2 .gmd formats [Dai Gyakuten Saiban 2]

[smiler]

Hello, I need help with a few file formats. From the game Dai Gyakuten Saiban 2: Naruhodou Ryuunosuke no Kakugo.
They're an encrypted form of .gmd file used for MT Frameworks. I need a way to decrypt them, and re-encrypt them back.
Help would be much appreciated.

Link to the sample file:
https://drive.google.com/file/d/0B_S0wg ... sp=sharing

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Anyone? It seems like some sort of XOR but I'm uneducated on the subject of decryption.

[aluigi]

Upload more gmd files.

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Upload more gmd files.

Here you go. Should be almost all of them.
https://my.mixtape.moe/lzzxie.7z

[aluigi]

Do you have also the executable of the game?

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Do you have also the executable of the game?

I'll give you the .cia of the game.
https://drive.google.com/file/d/0B_S0wg ... sp=sharing

[aluigi]

ctrtool doesn't extract it

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ctrtool doesn't extract it

Packhack worked for it, so I'll just give you the extracted form.
https://drive.google.com/file/d/0B_S0wg ... sp=sharing

[aluigi]

I have found the key:
http://aluigi.org/bms/3ds_gmd_mt.bms

Long story short: the script simply dumps the decrypted data without handling the GMD format (because they are text strings, not files). You can use the reimport mode to put the edited data back but pay attention to not change the length of the strings (use spaces if yours are shorter)

[smiler]

I have found the key:
http://aluigi.org/bms/3ds_gmd_mt.bms

Long story short: the script simply dumps the decrypted data without handling the GMD format (because they are text strings, not files). You can use the reimport mode to put the edited data back but pay attention to not change the length of the strings (use spaces if yours are shorter)

Thanks a lot!

[smiler]

Sorry for the bump, but how do you reimport it back with the two XOR strings using the same script? Reimporting using the same script doesn't work. It gets stuck on the first line of idstring "GMD/0" because the decrypted scripts no longer actually have the GMD magic number.