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

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Date:   Thu, 21 Jun 2018 18:15:06 +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 Thu, Jun 21, 2018 at 12:56:34PM +0300, Stanimir Varbanov wrote:
>
> > Is this really a pseudo-RNG? If so it needs to be moved over to
> > the algif_rng interface.
> 
> Despite the register name (PRNG_ registers prefix) the IP is using FIPS
> approved algorithm and we can claim that this is true hardware entropy
> generator.

Whether your RNG is a PRNG or not has nothing to do with the
algorithm you use.  No algorithm can generate entropy out of thin
air.

Cheers,
-- 
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