How to solve cuckoo cycle?

[yungd1plomat]

Hi, thanks for the great work you've done, but I have a question. What is the easiness param in CuckooContext?How can i use prefix and max_nonce from CyckooCycle?

[mindstorm38]

This code as been adapted from source, I have no knowledge in login challenges and I struggled to understand it when I implemented it. To be honest I don't know, if you find anything relevant on the web I would be interesting because I never found anything relevant when I re-implemented it.

I think the original source is the open source BigWorld we have here : https://github.com/v2v3v4/BigWorld-Engine-14.4.1
More exactly : https://github.com/v2v3v4/BigWorld-Engine-14.4.1/blob/4389085c8ce35cff887a4cc18fc47d1133d89ffb/programming/bigworld/lib/connection/cuckoo_cycle_login_challenge_factory.cpp

[yungd1plomat]

This code as been adapted from source, I have no knowledge in login challenges and I struggled to understand it when I implemented it. To be honest I don't know, if you find anything relevant on the web I would be interesting because I never found anything relevant when I re-implemented it.

I think the original source is the open source BigWorld we have here : https://github.com/v2v3v4/BigWorld-Engine-14.4.1 More exactly : https://github.com/v2v3v4/BigWorld-Engine-14.4.1/blob/4389085c8ce35cff887a4cc18fc47d1133d89ffb/programming/bigworld/lib/connection/cuckoo_cycle_login_challenge_factory.cpp

Yeah, I've seen that realization. After reversing the application, it seems that even the constants are correct, however I don't know how this response is encrypted as the implementation outputs 168 bytes (42 uint32 elements), however the client response to the server contains a minimum of 440 bytes (not including header) which corresponds to 110 elements of uint32

[mindstorm38]

So you're interested in understanding how the login challenge is exchanged between the client and the server? Because there is some inherent overhead due to the network protocol, and the packet does not contain only the raw response.
https://github.com/mindstorm38/wg-toolkit-rs/blob/master/wg-toolkit/src/net/element/login.rs#L63-L71

Don't know if that's what you're searching

[yungd1plomat]

So you're interested in understanding how the login challenge is exchanged between the client and the server? Because there is some inherent overhead due to the network protocol, and the packet does not contain only the raw response. https://github.com/mindstorm38/wg-toolkit-rs/blob/master/wg-toolkit/src/net/element/login.rs#L63-L71

Don't know if that's what you're searching

I figured it out, after sending LoginRequest the server asks for cuckoo_cycle, however how the cuckoo_cycle response is encoded I don't know

[yungd1plomat]

After cuckoo cycle response it's contains extra 272 bytes of data, i don't know what is it

[mindstorm38]

I think this is something I don't understand either... to be honest. At least I don't remember because I didn't touch this project for a year, I think I'll go back to it soon by the way.

[yungd1plomat]

I think this is something I don't understand either... to be honest. At least I don't remember because I didn't touch this project for a year, I think I'll go back to it soon by the way.

Yeah, I think so, too. This implementation of https://github.com/v2v3v4/BigWorld-Engine-14.4.1/tree/main doesn't contain any additional data, at least I couldn't find any, so apparently I'll have to reverse wot itself