PS3 Idolm@ster One For All .arc

[mikulover39]

Could someone take a look at this archive please.
It has a file table in the .bin file and the data in the .arc file
here's a sample of one of the archives http://www.mediafire.com/download/qwe8i ... /IMO4A.rar

[mikulover39]

I made a script do extract the files but they seem to be compressed or encrypted.
If someone could help with this that would be great.
A bit of a messy bms script but it extracts lol

Code: Select all

endian BIG
open FDDE ARC 0
open FDDE BIN 1
get null1 long 1
get null2 long 1
get files long 1
goto 0x10 1
get fileoff long 1
goto fileoff 1
savepos ntablestart1 1
goto 0x20 1
savepos ntablestart2 1
for i = 0 < files
goto ntablestart2 1
get nameoff long 1
get size long 1
get unk2 long 1
get unk3 long 1
savepos ntablestart2 1
goto ntablestart1 1
get offset long 1
savepos ntablestart1 1
goto nameoff 1
get name string 1
log name offset size 0
next i

[chrrox]

they are encrypted with most likely aes someone will have to dump the key.
its the same for all of the idolmaster games after the first one.

[Ekey]

We can try to find key if encryption is AES. Just share eboot

[mikulover39]

here's the eboot http://www.mediafire.com/download/cv9sf ... IMO4AE.rar

[Ekey]

Well signsrch did not find AES signatures but found Blowfish.

Code: Select all

007b3120 204  Blowfish bfp table [32.be.72]
007b3168 206  Blowfish ks0 table [32.be.1024]
007b3568 208  Blowfish ks1 table [32.be.1024]
007b3968 210  Blowfish ks2 table [32.be.1024]
007b3d68 212  Blowfish ks3 table [32.be.1024]
007b3168 1620 Blowfish_s_init [32.be.4096]

[mikulover39]

Oh so it uses a different type of encryption, do you think we would be able to find the key for it?

[Ekey]

Not confirmed that encryption is Blowfish. Probably but not sure.

[mikulover39]

Well looking at this eboot and the one for the previous game they do both contain the same line about AES encryption "nuscDecryptAES"