Dirt Rally 2.0 - DLC cars NEFS cant be opened
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The DLC cars (Porsche 911 RGT, Skoda Fabia WRC and Citroen C4 WRC for the moment) NEFS cant be opened. Can you take a look please? Much apreciated. Thank you.
The nefs headers appear to be encrypted. Initial attempts to determine method of encryption were unsuccessful. I'll revisit later but I can't guarantee anything.
Supporting DLC cars would be massive - and hugely appreciated by the whole community! There are a bunch of outstanding DLC cars both released and coming soon that we'd love to be able to mod <3
Hi, I am the creator of EECMT and stumbled upon this same issue. It would be great if you could look into this. Much appreciated!! thanks!!!!
Alternativaly if you could sketch a rough idea of how you would go about it (in your code) then I coud try myself.
Finally got some time to look at encrypted nefs files.
It appears the encryption method @Gigi1237 found (see here) is also used for the dlc cars. The only difference being that the header is encrypted also. The first 0x80 bytes of the header is encrypted/obfuscated with some unknown scheme. Once that is decrypted, the second 0x80 bytes of the header are decrypted using AES ECB with the key from the header at 0x24.
Need to reverse the decryption of the first 0x80 bytes of the header. Partially done, but no ETA on this.
If you need a hand figuring out encryption for dlc too let me know, and tell me if ypu have any leads where to look in the exe. As I'm relatively familiar with it. If i recall correctly I also saw decryption code for AES CBC but I never saw it called, although I never investigated much.
Yes that would be great. I'll send you an email later with some info.