linux-kernel - Re: [PATCH v2] crypto: sun4i-ss: support the Security System PRNG

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Message-ID: <20161205125738.GA13525@Red>
Date:   Mon, 5 Dec 2016 13:57:38 +0100
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     davem@...emloft.net, maxime.ripard@...e-electrons.com,
        wens@...e.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] crypto: sun4i-ss: support the Security System PRNG

On Mon, Dec 05, 2016 at 08:37:05PM +0800, Herbert Xu wrote:
> On Mon, Dec 05, 2016 at 11:48:42AM +0100, Corentin Labbe wrote:
> > From: LABBE Corentin <clabbe.montjoie@...il.com>
> > 
> > The Security System have a PRNG.
> > This patch add support for it as an hwrng.
> > 
> > Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> 
> Please don't add PRNGs to hwrng.  If we have existing PRNGs in
> there please let me know so that we can remove them.
> 

So how to expose PRNG to user space ? or more generally how to "use" a PRNG ?

I found hisi-rng, crypto4xx_ and exynos-rng which seems to be PRNG used as hwrng.

Regards