From: David VomLehn <dvomlehn@cisco.com>
To: Robin Getz <rgetz@blackfin.uclinux.org>
Cc: linux-embedded@vger.kernel.org
Subject: Re: Sources of entropy?
Date: Wed, 25 Mar 2009 10:06:10 -0700 [thread overview]
Message-ID: <49CA6482.4090809@cisco.com> (raw)
In-Reply-To: <200903241847.29104.rgetz@blackfin.uclinux.org>
Robin Getz wrote:
> I'm just wondering what people using on standard embedded/headless/diskless
> targets (which do not have hw random number generators) as a source of
> entropy - since networking was removed as an entropy source circa 2.6.26
>
> On my target:
>
> root:/> cat /proc/sys/kernel/random/entropy_avail
> 0
>
> is about all I get... (since I'm not running any userspace utils yet).
>
> I have seen rngd, clrngd, audio_entropyd, & video_entroyd - but I was just
> wondering what others were actually using. (I was cautioned that everything
> was pretty CPU intensive, since they all have a FIPS testing to ensure
> randomness)...
The answer on the box I'm working on is: very little. I need to generate
an Ethernet MAC address and had to come up with way so that few random
bits I had were sufficient, in my particular environment, to avoid
address collisions.
next prev parent reply other threads:[~2009-03-25 17:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-24 22:47 Sources of entropy? Robin Getz
2009-03-25 17:06 ` David VomLehn [this message]
2009-03-26 13:25 ` Jamie Lokier
2009-04-02 11:45 ` Nicholas Mc Guire
2009-04-02 12:03 ` Mike Frysinger
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49CA6482.4090809@cisco.com \
--to=dvomlehn@cisco.com \
--cc=linux-embedded@vger.kernel.org \
--cc=rgetz@blackfin.uclinux.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).