Add result of #312 to manpage.
I do not think such information should be in man pages, it is low-level info that should be used only by very experienced users.
But maybe it can be in FAQ, I am adding Arno to cc just for consideration.
I had a feeling that might happen. :-)
FAQ is also fine. I just think that if the man page states that the keyfile is generated using this or that hash function, it is subtly contradicting what you said in #312 (closed): it's using a variant of the hash function, and I feel the user should be able to find that information if she's looking for it.
Anyway. It's a good man page. I can't say for sure if you should listen to me.