rotten news relay - comp.unix.bsd.openbsd.misc - Feeding entropy to /dev/random

Subject: Feeding entropy to /dev/random
From: SAB
Newsgroups: comp.unix.bsd.openbsd.misc
Organization: ATMAN - ATM S.A.
Date: Tue, 16 Apr 2019 02:49 UTC

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From: sab@no.ne (SAB)
Newsgroups: comp.unix.bsd.openbsd.misc
Subject: Feeding entropy to /dev/random
Date: Tue, 16 Apr 2019 02:49:12 +0000 (UTC)
Organization: ATMAN - ATM S.A.
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Hello.

I was wondering if there is an easy way to feed entropy to /dev/random or
arc4random() on OpenBSD. (My understanding is that they both use same
entropy spool.)

I did some research and found this nice NetBSD man page:

<https://man.openbsd.org/NetBSD-7.0.1/rnd.4>

It mentions rndctl command, which, unfortunately, does not exist in
OpenBSD.

The RNDADDDATA ioctl is also doing exactly what I was thinking of but
only once per boot (why?)

Is there anything similar in OpenBSD?

Subject: Re: Feeding entropy to /dev/random
From: Christian Weisgerber
Newsgroups: comp.unix.bsd.openbsd.misc
Date: Tue, 16 Apr 2019 11:04 UTC
References: 1

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From: naddy@mips.inka.de (Christian Weisgerber)
Newsgroups: comp.unix.bsd.openbsd.misc
Subject: Re: Feeding entropy to /dev/random
Date: Tue, 16 Apr 2019 11:04:16 -0000 (UTC)
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On 2019-04-16, SAB <sab@no.ne> wrote:

> I was wondering if there is an easy way to feed entropy to /dev/random or

Yes, you can write to /dev/random. /etc/rc and the installer do
so.

--
Christian "naddy" Weisgerber naddy@mips.inka.de

BOFH excuse #358: struck by the Good Times virus

comp / comp.unix.bsd.openbsd.misc / Feeding entropy to /dev/random

Subject	Author
Feeding entropy to /dev/random	SAB
Re: Feeding entropy to /dev/random	Christian Weisgerber