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PS3 Idolm@ster One For All .arc

Posted: Sat May 17, 2014 4:43 pm
by 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

Re: PS3 Idolm@ster One For All .arc

Posted: Sun May 18, 2014 5:48 pm
by 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

Re: PS3 Idolm@ster One For All .arc

Posted: Sun May 18, 2014 6:29 pm
by 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.

Re: PS3 Idolm@ster One For All .arc

Posted: Sun May 18, 2014 7:29 pm
by Ekey
We can try to find key if encryption is AES. Just share eboot

Re: PS3 Idolm@ster One For All .arc

Posted: Sun May 18, 2014 7:37 pm
by mikulover39

Re: PS3 Idolm@ster One For All .arc

Posted: Sun May 18, 2014 10:20 pm
by 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]

Re: PS3 Idolm@ster One For All .arc

Posted: Mon May 19, 2014 7:40 am
by mikulover39
Oh so it uses a different type of encryption, do you think we would be able to find the key for it?

Re: PS3 Idolm@ster One For All .arc

Posted: Mon May 19, 2014 2:06 pm
by Ekey
Not confirmed that encryption is Blowfish. Probably but not sure.

Re: PS3 Idolm@ster One For All .arc

Posted: Mon May 19, 2014 5:58 pm
by mikulover39
Well looking at this eboot and the one for the previous game they do both contain the same line about AES encryption "nuscDecryptAES"