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

From	Herbert Xu <herbert@gondor.apana.org.au>
Newsgroups	linux.kernel
Subject	Re: [PATCH] crypto: sun4i-ss: support the Security System PRNG
Date	2017-06-22 01:50 +0200
Message-ID	<tUXxL-4Ng-5@gated-at.bofh.it> (permalink)
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On Wed, Jun 21, 2017 at 08:48:55AM +0200, Maxime Ripard wrote:
> 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.

The hwrng interface is meant for true hardware RNGs.  The crypto API
rng interface is primarily intended for PRNGs.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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[PATCH] crypto: sun4i-ss: support the Security System PRNG Corentin Labbe <clabbe.montjoie@gmail.com> - 2017-06-20 11:10 +0200
  Re: [PATCH] crypto: sun4i-ss: support the Security System PRNG Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-06-20 12:00 +0200
    Re: [PATCH] crypto: sun4i-ss: support the Security System PRNG Corentin Labbe <clabbe.montjoie@gmail.com> - 2017-06-20 13:50 +0200
      Re: [PATCH] crypto: sun4i-ss: support the Security System PRNG Maxime Ripard <maxime.ripard@free-electrons.com> - 2017-06-21 08:50 +0200
        Re: [PATCH] crypto: sun4i-ss: support the Security System PRNG Herbert Xu <herbert@gondor.apana.org.au> - 2017-06-22 01:50 +0200

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