Random string generation during *-install

[Jean-Yves Migeon <jeanyves.migeon%free.fr@localhost>]

Dear list,

What is the correct way of generating a fixed random string on 
pre-install or do-install stage?

I Was thinking along the line "openssl rand -hex <size>" , however I 
can't seem to find any example in current pkgsrc nor any other 
equivalent command. Is it safe to assume that openssl is available at 
this stage even on !NetBSD platforms?

I would prefer avoiding this during build to avoid sharing the id/key 
between multiple installations.

Thanks,

--
Jean-Yves Migeon