What type of encoding is this?
0x6a656c6c7966697368
cause i'm trying to decode it

According to its structure I'd say that this is SEAL (Software-Optimized Encryption Algorithm). It's difficult to describe how it works, because this kind of ciphers is very tricky. This algorithm uses 160 bit key and it uses 3 tables (R, S, T) to encode and decode.

I'll attach the image where you can see a process of creating a pseudo-random function:

Go to settings and or ask google