Can i modify hashcat to make it generate random instead of all possible combination?

[dtoan140298]

From how I understand your description, it does not matter, whether you try them in single attempts or simply merge all 3 charsets into one.

OK, so i tried the case that put 3 kinds of characters into one charsets. Look like it can generate random by it check a cadidate multiple time on small position like this: xxxx123456 ->yyyy123456 which instead of entire candidate as i said & none of my pseudo password was found, my GPU can hash 10 times sqrt(N) candidates per second on SHA-256. If you have any knowledge about hashcat proggraming, could you tell me which function in the source that handle the generate? i want ot see how it work