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Steam returning Invalid Ticket for getAuthSessionTicket

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Hello, I've been recently trying to use steam-user to login, and fetch an auth session ticket. After converting the result of the function into hexadecimal and trying to authenticate through steam, I get an "Invalid ticket' error from steam. Any ideas on what I could be screwing up on?

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Yeah, I've debugged it a bunch, and the buffer length from steamworks comes out to be around 312 bytes, while the one from steam-user comes out to be around 306 bytes, ~6 bytes difference, which probably means they just added a new field to the struct. I would RE the steamclient (or whatever respective dll generates the session token), but I'm busy.

 

 

Edit:

After doing more debugging steam seem to be doing something with the app ownership ticket, the one we get from steam is 250 bytes. However, the one i tested against (one from steamworks) is 256 bytes, gonna do some more reversing to find out.

Edited by Nexure

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