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Ven, posted Thu Oct 21, 2021 12:54 pm (67109)

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Hello, I'm working on a translation for the PSVita version of The Genius of Sappherios, and since there's already a translation for the pc version I thought I might see those for ease of use.
Unfortunately the pc game (and translation) uses .pak files, and I can't figure out how to unpack them, can anyone help me? Thanks in advance.

Link for the translation .pak files: https://www.mediafire.com/file/l0jyl7e6 ... s.rar/file

aluigi, posted Fri Dec 10, 2021 1:52 pm (68129)

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The first 32bit number is the only thing in clear-text, everything else seem encrypted/obfuscated.
The only thing I noticed is the block of data starting from about offset 0x9ba1c0 of Game.pak which is a sequence of the same 64 bytes, but it's not a xor key and probably not related to any block cipher encryption.

Ekey, posted Fri Dec 10, 2021 3:12 pm (68133)

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Edited: I looked at my old source codes and found the Touhou Monsters Card game, I make tool for unpack files - 7 years ago. Format and encryption is absolutely identical



Encryption: Mersenne Twister Xor (64 bytes key)

Ekey, posted Fri Dec 10, 2021 5:46 pm (68143)

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Done!

Binaries: here
Sources: here

DJ Normality, posted Fri Dec 10, 2021 6:23 pm (68144)

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yo thats crazy thanks Ekey have to check it out