linux-kernel - Re: [PATCH] crypto: sun4i-ss: support the Security System PRNG

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Message-ID: <20170621064855.z5mu4f3r3dt4kotc@flea.lan>
Date:   Wed, 21 Jun 2017 08:48:55 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net, wens@...e.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] crypto: sun4i-ss: support the Security System PRNG

On Tue, Jun 20, 2017 at 01:45:36PM +0200, Corentin Labbe wrote:
> On Tue, Jun 20, 2017 at 11:59:47AM +0200, Maxime Ripard wrote:
> > Hi,
> > 
> > On Tue, Jun 20, 2017 at 10:58:19AM +0200, Corentin Labbe wrote:
> > > The Security System have a PRNG, this patch add support for it via
> > > crypto_rng.
> > 
> > This might be a dumb question, but is the CRYPTO_RNG code really
> > supposed to be used with PRNG?
> > 
> 
> Yes, see recently added drivers/crypto/exynos-rng.c

It's still not really clear from the commit log (if you're talking
about c46ea13f55b6) why and if using the RNG code for a PRNG is a good
idea.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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