linux-kernel - Re: [PATCH 3/3] hwrng: msm

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Message-ID: <20180622143829.rd2ys6ci7q3aupst@gondor.apana.org.au>
Date:   Fri, 22 Jun 2018 22:38:29 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>
Cc:     Vinod Koul <vinod.koul@...aro.org>, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH 3/3] hwrng: msm - Add support for prng v2

On Fri, Jun 22, 2018 at 11:27:59AM +0300, Stanimir Varbanov wrote:
> Hi Herbert,
> 
> On 06/21/2018 02:53 PM, Herbert Xu wrote:
> > On Thu, Jun 21, 2018 at 02:27:10PM +0300, Stanimir Varbanov wrote:
> >>
> >> OK, I just wanted to say that it is _not_ PRNG and the register names
> >> gives us wrong impression.
> > 
> > So does it generate one bit of output for each bit of hardware-
> > generated entropy like /dev/random? Or does it use a hardware-
> > generated seed to power a PRNG?
> 
> I believe it is the second one. Isn't the second one SP 800-90A?

In that case it should switch over to algif_rng.

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