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

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Date:   Fri, 22 Jun 2018 20:18:09 +0530
From:   Vinod <vkoul@...nel.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Stanimir Varbanov <stanimir.varbanov@...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
Subject: Re: [PATCH 3/3] hwrng: msm - Add support for prng v2

On 22-06-18, 22:38, Herbert Xu wrote:
> 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.

Okay I am doing the port taking the exynos-rng as a ref.
Question is how to test it, how is one supposed to exercise the rng, any
test utils/apps for that? Sorry for noob question, new to crypto
interfaces.

-- 
~Vinod