Date: Sat, 25 Jul 2015 10:30:55 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: Alexey Dokuchaev <danfe@freebsd.org> Cc: Mark R V Murray <markm@freebsd.org>, svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers <src-committers@freebsd.org> Subject: Re: svn commit: r284959 - in head: . share/man/man4 share/man/man9 sys/conf sys/dev/glxsb sys/dev/hifn sys/dev/random sys/dev/rndtest sys/dev/safe sys/dev/syscons sys/dev/ubsec sys/dev/virtio/random sy... Message-ID: <20150725173054.GV78154@funkthat.com> In-Reply-To: <20150725143629.GA49086@FreeBSD.org> References: <201506301700.t5UH0jPq001498@svn.freebsd.org> <alpine.BSF.2.20.1507221138360.1071@desktop> <FFAED695-145A-45F5-988D-B843EF5F544B@FreeBSD.org> <alpine.BSF.2.20.1507221249120.1071@desktop> <FFFB06D7-164B-40B3-AFC3-A6630BCF074E@bsdimp.com> <E20B169F-4C8A-4D11-9853-5C2EFC116450@FreeBSD.org> <F54A96A8-D9AD-409A-814F-538B6AD3CD50@yahoo.com> <20150724012519.GE78154@funkthat.com> <BC734D25-375C-4C1C-BA8A-BD91158B6A39@FreeBSD.org> <20150725143629.GA49086@FreeBSD.org>
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Alexey Dokuchaev wrote this message on Sat, Jul 25, 2015 at 14:36 +0000:
> On Fri, Jul 24, 2015 at 07:59:35AM +0100, Mark R V Murray wrote:
> > [...]
> > > Heck, piping in mic data to /dev/random is a good way to seed the
> > > rng on many machines.
> >
> > Well, sure, but what if you don't have microphone? I want lots
> > of choices, in anticipation of only a subset being usable.
>
> I like the microphone idea. Not just it adds another hard-to-mess-with
> (?) entropy source, it can also be a nice "reference" example for people
> wanting to write their own sources and plug them into the RNG framework.
Shouldn't be done in kernel, just do it from userland, by adding the
following to cron:
3 * * * * root sleep $(jot -r 1 120 1); dd if=/dev/dsp bs=512 count=5 2>/dev/null | sha512 > /dev/random
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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