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From: Isaac Dunham <ibid.ag@gmail.com>
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Subject: Re: Recommended way to probe for bcrypt support?
Date: Mon, 23 Jun 2014 21:07:26 -0700
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On Mon, Jun 23, 2014 at 07:52:55PM -0400, Rich Felker wrote:
> > Unfortunately, at runtime detecting bcrypt in
> > this way is a bit slow since the minimum cost setting is 4 (meaning 16
> > iterations of the eksBlowfish loop).  For mkpasswd it is acceptable -
> > so do it - but e.g. in phpass I am reluctant to do it that way.
> 
> I'm not clear why it would be necessary to probe for it when not
> actually attempting to use it, except in cases like providing a list
> of supported hashes (e.g. --help or similar). The normal usage case
> for "runtime probe" seems to be "try to use it, and report failure if
> it's not available".
FYI, (toybox) mkpasswd has "-m help".
(passwd currently has a static list of hashes.)

Thanks,
Isaac Dunham