Adv_crypto is a project mainly written in C and ERLANG, it's free.
Erlang OTP Application that renames erlang's default crypto library and adds sha256 and sha512 functionality.
adv_crypto is the same library as erlang's crypto except it includes sha256 and sha512 methods. adv_crypto should be up to date with the default crypto library but may be one version behind at any time.
If the driver fails to link on erl_interface open up c_src/Makefile and change the erl_interface path to the one you have on your computer. Right now its set to link against OTP R12B-5.