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Old 06-01-2019, 03:41
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Project CARS 2 Bff Decryption Tool

Hello, here's the release of the decryption tool for this particular game.

At least the devs didn't use extreme compression settings like the FIFA 19 release even though they are called Slightly Mad Studio...

Enjoy.
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File Type: 7z pcars2_bdt_R1.7z (1.48 MB, 120 views)
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Last edited by Razor12911; 08-01-2019 at 14:04.
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Old 06-01-2019, 12:13
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Assuming you did your research, won't link zenhax/xentax, and if not, here you go:

https://forum.xentax.com/viewtopic.php?f=16&t=17057

Seems its using RC4, don't have bff file to test, any sample would be appreciated.
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Old 06-01-2019, 14:07
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Quote:
Originally Posted by Shateiel View Post
Assuming you did your research, won't link zenhax/xentax, and if not, here you go:

https://forum.xentax.com/viewtopic.php?f=16&t=17057

Seems its using RC4, don't have bff file to test, any sample would be appreciated.
I was rather expecting stuff like, don't waste your time on this because of slow recompression but I guess I shouldn't worry about that, and yes. I did a bit of research, for now. I figured out how to decrypt pretty much the entire game, all I need is a good strategy of detecting streams without reading the headers so I guess all is in good order.
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Old 06-01-2019, 18:34
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Quote:
Originally Posted by Razor12911 View Post
Who is This this Guy?
Where'd he from?
I think he's an aline

Tadaa.... Gotcha

Hi bro what you need,
Just tell me what to do,
I want to help you.... You know like old days...
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Old 06-01-2019, 20:47
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Quote:
Originally Posted by Razor12911 View Post
I was rather expecting stuff like, don't waste your time on this because of slow recompression but I guess I shouldn't worry about that, and yes. I did a bit of research, for now. I figured out how to decrypt pretty much the entire game, all I need is a good strategy of detecting streams without reading the headers so I guess all is in good order.

Don't think there is any other way but to look for "PAK " and then parse and decrypt. You could've looked for encrypted headers as RC4 is simple, made a class reader to decrypt while reading to decompress, but thats out of option when recompressor and decyptor are two different exe.

Unless you got some some other brilliant idea which you can share (:
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Old 07-01-2019, 14:55
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Quote:
Originally Posted by Shateiel View Post
Don't think there is any other way but to look for "PAK " and then parse and decrypt. You could've looked for encrypted headers as RC4 is simple, made a class reader to decrypt while reading to decompress, but thats out of option when recompressor and decyptor are two different exe.

Unless you got some some other brilliant idea which you can share (:
Well I managed to do it without looking for "PAK " and parsing any of the headers

using bdt+oo2reck:
Code:
Compressed 1 file, 4,339,674 => 16,546,064 bytes. Ratio 381.27%
Compression time: cpu 0.03 sec/real 2.79 sec = 1%. Speed 1.56 mB/s

Extracted 1 file, 16,546,064 => 4,339,674 bytes. Ratio 381.27%
Extraction time: cpu 0.00 sec/real 0.77 sec = 0%. Speed 5.63 mB/s

4,13 MB (4 339 674 bytes) >> 15,7 MB (16 546 306 bytes)
using QuickBMS and nfsshift.bms:
Code:
4,13 MB (4 339 674 bytes) >> 15,7 MB (16 543 104 bytes)
Edit:

A bit bigger input this time and here are the results:
Code:
Compressed 1 file, 332,106,505 => 1,904,256,950 bytes. Ratio 573.39%
Compression time: cpu 0.70 sec/real 126.43 sec = 1%. Speed 2.63 mB/s

Tested 1 file, 1,904,256,950 => 332,106,505 bytes. Ratio 573.39%
Testing time: cpu 0.75 sec/real 27.13 sec = 3%. Speed 12.24 mB/s
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Last edited by Razor12911; 07-01-2019 at 15:40.
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Old 07-01-2019, 19:56
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Quote:
Originally Posted by Razor12911 View Post
Well I managed to do it without looking for "PAK " and parsing any of the headers

using bdt+oo2reck:
Code:
Compressed 1 file, 4,339,674 => 16,546,064 bytes. Ratio 381.27%
Compression time: cpu 0.03 sec/real 2.79 sec = 1%. Speed 1.56 mB/s

Extracted 1 file, 16,546,064 => 4,339,674 bytes. Ratio 381.27%
Extraction time: cpu 0.00 sec/real 0.77 sec = 0%. Speed 5.63 mB/s

4,13 MB (4 339 674 bytes) >> 15,7 MB (16 546 306 bytes)
using QuickBMS and nfsshift.bms:
Code:
4,13 MB (4 339 674 bytes) >> 15,7 MB (16 543 104 bytes)
Edit:

A bit bigger input this time and here are the results:
Code:
Compressed 1 file, 332,106,505 => 1,904,256,950 bytes. Ratio 573.39%
Compression time: cpu 0.70 sec/real 126.43 sec = 1%. Speed 2.63 mB/s

Tested 1 file, 1,904,256,950 => 332,106,505 bytes. Ratio 573.39%
Testing time: cpu 0.75 sec/real 27.13 sec = 3%. Speed 12.24 mB/s
Always the Smart One Good Work Mate..
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Old 07-01-2019, 20:58
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Hi Razor12911

Hi Razor12911
Very nice development
Thank you
Project CARS 2 bff Decryptor (WIP)
Fit to try the application you're glued to?
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Old 08-01-2019, 14:09
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Initial release uploaded

Tested on:
Project CARS 2 - Spirit of Le Mans vers 7.1.0.1 (12/2018)

Pakfiles\Vehicles:
Code:
Compressed 703 files, 6,564,499,114 => 15,042,895,652 bytes. Ratio 229.16%
Compression time: cpu 41.98 sec/real 4437.19 sec = 1%. Speed 1.48 mB/s

Tested 703 files, 15,042,895,652 => 6,564,499,114 bytes. Ratio 229.16%
Testing time: cpu 15.78 sec/real 549.54 sec = 3%. Speed 11.95 mB/s
I wonder what game should be next to try and decrypt...
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Old 08-01-2019, 23:36
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ok;
so done compressing with srep+lolz bff files 45.6gb > 95.6gb > 42.4gb > 18.9gb
bdt+oo2reck took around 3 hours...
edit : decompression it get to 4.7% remain stuck then data corrupt
it seem that bdt disappear in the processes but oo2reck continue to work for while then i get error
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Last edited by doofoo24; 09-01-2019 at 00:32.
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Old 08-01-2019, 23:38
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Quote:
Originally Posted by doofoo24 View Post
ok;
so done compressing with srep+lolz bff files 45.6gb > 95.6gb > 42.4gb > 18.9gb
bdt+oo2reck took around 3 hours
Nicely done... Numbers....
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Old 09-01-2019, 05:06
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Quote:
Originally Posted by doofoo24 View Post
ok;
so done compressing with srep+lolz bff files 45.6gb > 95.6gb > 42.4gb > 18.9gb
bdt+oo2reck took around 3 hours...
edit : decompression it get to 4.7% remain stuck then data corrupt
it seem that bdt disappear in the processes but oo2reck continue to work for while then i get error
Have you tested with unpack.bat?
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Old 09-01-2019, 07:14
doofoo24 doofoo24 is offline
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ya the same thing
it manage to decompress 2.12gb then the bdt disappear

Last edited by doofoo24; 09-01-2019 at 07:19.
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Old 09-01-2019, 15:21
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could you run bdt by itself to see what happens when you unpack, since anyways it's fastest way I can think of to start debugging this thing
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Old 09-01-2019, 15:57
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ok so bdt alone decompress fine...
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