Quick disclaimer: please tell me straight if I make any mistakes, I'm a bit of a n00b.
I would like to extract some assets from the Professor Layton and the Curious Village mobile game. The roadblock in my way is the fact that the .obb can't be opened through WinRAR, unlike most .obb files.
There's no point to posting more images, it's 300MB of gibberish with no discernible structure.
aluigi wrote:The lack of header or footer and the complete senseless content makes me think it's just encrypted.
Yes, that was my original assumption, before I trimmed down the topic. What do you think I should do, in that case? Is there any hope for me to decrypt this? I'm willing to pay someone to do it - it means that much to me.
aluigi wrote:Reverse engineering is the only solution. There is a "Market" section here just in case: viewforum.php?f=14
Apologies for the late reply, for some reason I'm not receiving email notifications. Given it's on Android and doesn't seem to use any proprietary formats other than Criware, (hell, the game uses PNG files for textures) what do you think would be the price and time frame? And if an update occurs, what's the chance the process would need to be repeated?
I have no control or statistics about the Market section. To be honest I don't like that section, it exists only because I can't avoid people to make such requests when they have no other solutions.
aluigi wrote:I have no control or statistics about the Market section. To be honest I don't like that section, it exists only because I can't avoid people to make such requests when they have no other solutions.
Alright, thanks a lot for the help anyways! I'll see if I can try to commission someone when I have the money, as it seems like I have no other choice. Here's hoping the upcoming Layton ports use the same method.
set OFFSET long 0 set TSIZE long 0x14 callfunction Decrypt 1 math m = -1 get HDR long m
if HDR == 0x31435241 get FSIZE long m get OFFSET long m get TSIZE long m callfunction Decrypt 1 get FILES long m savepos POS m for j = 0 < FILES goto POS m get NAME_OFF long m get OFFSET long m get TSIZE long m savepos POS m goto NAME_OFF m get NAME string m string MP4 = NAME string MP4 $ ".mp" log MEMORY_FILE2 OFFSET TSIZE if MP4 != ".mp4" callfunction Decrypt2 1 endif log NAME 0 TSIZE MEMORY_FILE2 next j else print "Error: Unknown format (Header value: %HDR|h%)" cleanexit endif
startfunction Decrypt log MEMORY_FILE OFFSET TSIZE math OFFSET + 0x45243 for i = 0 < TSIZE math OFFSET * 0x41C64E6D math OFFSET + 0x3039 math OFFSET & 0xFFFFFFFF math KEY = OFFSET math KEY u> 0x18 getvarchr KEYX MEMORY_FILE i byte math KEYX ^ KEY putvarchr MEMORY_FILE i KEYX byte next i endfunction
startfunction Decrypt2 math OFFSET + 0x45243 for i = 0 < TSIZE math OFFSET * 0x41C64E6D math OFFSET + 0x3039 math OFFSET & 0xFFFFFFFF math KEY = OFFSET math KEY u> 0x18 getvarchr KEYX MEMORY_FILE2 i byte math KEYX ^ KEY putvarchr MEMORY_FILE2 i KEYX byte next i endfunction
idstring "HP10" get FILES long get FSIZE long get TOC_END long get TOC_NAME long get FILE_OFF long set POS long 48
for i = 0 < FILES goto POS get OFFSET long get SIZE long get NAME_OFF long math OFFSET + FILE_OFF math NAME_OFF + TOC_NAME goto NAME_OFF get NAME string log NAME OFFSET SIZE math POS + 32 next i
Thank you so much! I have one question, I want to fan translate this game, but when I try to reimport the files it doesn't work and it gives me an error:
Error: script invalid for reimporting, it uses MEMORY_FILEs You can use the -. option or quickbmsver "-." if this script is meant to act as a header/data builder (for example if it adds a RIFF header to raw PCM data embedded in the file, and so on), the MEMORY_FILE data will be skipped automatically allowing to reimport the real file data
Last script line before the error or that produced the error: 30 log NAME 0 TSIZE MEMORY_FILE2
Would it be possible in some way to reimport the files with QuickBMS, or do I need to wait on another program to be able to reimport files?
Hopefully someone can help me with this! But it's already awesome to be able to extract the files!
set MEMORY_FILE10 string " void Decrypt(unsigned int OFFSET, unsigned char *data, int size) { OFFSET += 0x45243; for(int i = 0; i < size; i++) { OFFSET *= 0x41C64E6D; OFFSET += 0x3039; OFFSET &= 0xFFFFFFFF; data[i] ^= (OFFSET >> 0x18); } } "
set OFFSET long 0 set TSIZE long 0x14 log MEMORY_FILE OFFSET TSIZE calldll MEMORY_FILE10 Decrypt tcc RET OFFSET MEMORY_FILE TSIZE math m = -1 get HDR long m
if HDR == 0x31435241 get FSIZE long m get OFFSET long m get TSIZE long m log MEMORY_FILE OFFSET TSIZE calldll MEMORY_FILE10 Decrypt tcc RET OFFSET MEMORY_FILE TSIZE get FILES long m savepos POS m for j = 0 < FILES goto POS m get NAME_OFF long m get OFFSET long m get TSIZE long m savepos POS m goto NAME_OFF m get NAME string m string MP4 = NAME string MP4 $ ".mp" encryption "" "" if MP4 != ".mp4" encryption calldll "MEMORY_FILE10 Decrypt tcc RET OFFSET #INPUT# #INPUT_SIZE#" endif log NAME OFFSET TSIZE encryption "" "" next j else print "Error: Unknown format (Header value: %HDR|h%)" cleanexit endif
Fantastic! I just tested it out, and it indeed fixes the import issue. Sorry for the late reply, Gmail automatically sends all Zenhax updates to the spam folder. I shall do some further testing, and then I'll add your contribution to my Github repo.
Managed to reimport it with command lines, but now the app still wants to download the data, so i don't think that the game recognizes the file
Edit 2:
I get why it doesn't work. reimport2 doesn't work, so all the files have to be the same as the original, and that is impossible But hey, thanks for the script!
