BIG NEWS! A decryption tool for CookieRun OvenBreak's sequenced music is finally made! by kookeerawn at 4:31 PM EDT on July 30, 2020
I just found out that the MIDI files in CookieRun OvenBreak use the SALSA20 decryption. The developers used it to play the music on the game's sound engine.
I had no idea MIDI files were playable in Cocos2d-x!
Bad news, starting from the Season 6 update, the MIDI files don't use the SALSA20 decryption/encryption anymore.
It's using a different method of encryption instead. I created a new issue in Link to let SimonTime know about this and make a new tool for the updated encryption.