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

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Message-ID: <20180701062734.s6ldsbhi42hnn6x6@gondor.apana.org.au>
Date:   Sun, 1 Jul 2018 14:27:34 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Vinod <vkoul@...nel.org>
Cc:     Timur Tabi <timur@...nel.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        linux-crypto@...r.kernel.org, lkml <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 Fri, Jun 29, 2018 at 02:07:32PM +0530, Vinod wrote:
>
> I think Stan did bring this point earlier that PRNG is compliant to
> FIPS-140-2. So it can be used by rng clients for various purposes but
> should not be fed to dev/random as the hw_random does.
> 
> Herbert, can you please confirm..

Yes this is a PRNG.  A hardware RNG should return 1 bit of entropy
per bit of output.

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