Date: Tue, 28 Jul 2015 16:04:42 +0000 From: Alexey Dokuchaev <danfe@FreeBSD.org> To: John-Mark Gurney <jmg@funkthat.com> 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: <20150728160442.GA16709@FreeBSD.org> In-Reply-To: <20150725173054.GV78154@funkthat.com> References: <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> <20150725173054.GV78154@funkthat.com>
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On Sat, Jul 25, 2015 at 10:30:55AM -0700, John-Mark Gurney wrote: > 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 Hey, that's nice, thanks! I didn't realize from reading random(4) that it can be fed like this. Perhaps manpage should be updated (the cron trick could be a nice candidate for EXAMPLES section or something)... ./danfe
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