I've been working on the encryption for Monster Hunter games for a long time (since Monster Hunter Portable 2nd G).
I haven't really spread my code around much but it's always been available on my github and I feel like more people might be interested in it now.
Here's my repo dealing with the encryption:
https://github.com/svanheulen/mhef
It's has code for decrypting/encrypting DLC and saves from Monster Hunter 4 Ultimate and all the the Monster Hunter games from the PSP....
MH4U DLC and savefile encryption
I haven't really spread my code around much but it's always been available on my github and I feel like more people might be interested in it now.
Here's my repo dealing with the encryption:
https://github.com/svanheulen/mhef
It's has code for decrypting/encrypting DLC and saves from Monster Hunter 4 Ultimate and all the the Monster Hunter games from the PSP....
MH4U DLC and savefile encryption