Its also similar to an abstraction in Erlang. The crypto application is started ...

phamilton on April 13, 2014 | parent | context | favorite | on: Webservers shouldn't have direct access to keys

Its also similar to an abstraction in Erlang. The crypto application is started and all processes defer to the crypto application for operations. I don't know of the implementation is as secure as the article describes, but the abstraction is simple and straightforward.