From: Keith Packard <keithp@keithp.com>
Subject: Re: [PATCH] hwrng: core - Allow for multiple simultaneous active hwrng devices
Date: Tue, 09 Aug 2016 16:26:30 -0700
Message-ID: <86bn11r0bd.fsf@hiro.keithp.com>
References: <1469477255-26824-1-git-send-email-keithp@keithp.com> <20160809095058.GA6618@gondor.apana.org.au> <20160809165710.GC2013@io.lakedaemon.net> <20160809201846.GA4684@khazad-dum.debian.net>
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Cc: Herbert Xu <herbert@gondor.apana.org.au>,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
	Jason Cooper <jason@lakedaemon.net>
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In-Reply-To: <20160809201846.GA4684@khazad-dum.debian.net>
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Henrique de Moraes Holschuh <hmh@hmh.eng.br> writes:

> IMHO, this is mightly annoying to use from inside a rngd-like utility in
> a race-free, safe way.  It looks to me that ioctl() would be a much
> better interface for everything but the "enabled" functionality (which
> should be reported to the rngd-like utility as open() on the real device
> failing with, e.g., ENXIO, when that source is disabled).

What information does an rngd-like program actually want? All I can
think that it would need is the stream of random data. I guess some
estimate of the entropy available would be nice, but surely it would
want to verify that in any case.

=2D-=20
=2Dkeith

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