Good info. It makes sense -- I've learned WIF / key generation recently. It looks like Steem format is basically standard WIF with the first symbols of the base58 key = "STM" (or more accurately a WIF always starting with M and ST prefixed). Where can the CLI be found is the question. WIF originated with Bitcoin from what I read but is now generic used by basically all coins incl. steem of course. This is a double sha 256 call -- shown in the c++ above -- similar to bitcoin address generation