public_key w/openssl engine?

Roger Lipscombe <[email protected]>
Newsgroups gmane.comp.lang.erlang.general
Message-ID <CAJgnQd9tHwSvniOGXzvYQobEzo5A-1U4J12C76JB416_JFc4og@mail.gmail.com> 
The crypto app (https://erlang.org/doc/man/crypto.html) supports
OpenSSL engines which, in turn, allows use of private keys stored in
an HSM.

But there's no mention of the engine_key_ref() type in the public_key
documentation.

Can I use the OpenSSL engine functionality with the public_key app?
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