Marvel Rivals Decryption Algorithm

[natimerry]

We over at marvel rivals modding scene are trying to come up with a way to recreate NetEase's encryption method by forking repak Even if Fmodel or other readers supporting NetEase decryption manage to read our files, the game refuses to load it calling it's index corrupted.

Our guess from trying to find differences between the Index of our file and NetEase's file is that the index in NetEase's file is way bigger (over 10x from the file we tested). Heres some screenshots

vs

Although we are not using CUE4Parse for the decryption and encryption the logic is directly borrowed from CUE4Parse's source. We would like some clarity on how exactly is the Index file packed in NetEase's method to aid us on our try

https://github.com/natimerry/repak-rivals/tree/successful-file-encryption

heres the source if required