Project CARS 2/3 Bff Decryption Tool

[Shateiel]

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.

[Razor12911]

Originally Posted by Shateiel

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.

[yasitha]

Originally Posted by Razor12911

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...

[Shateiel]

Originally Posted by Razor12911

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 (:

[Razor12911]

Originally Posted by Shateiel

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:

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:

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:

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

[yasitha]

Originally Posted by Razor12911

Well I managed to do it without looking for "PAK " and parsing any of the headers

using bdt+oo2reck:

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:

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:

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..