From: Herbert Xu <herbert@gondor.apana.org.au>
Subject: Re: [PATCH 3/3] hwrng: msm - Add support for prng v2
Date: Sun, 1 Jul 2018 14:27:34 +0800
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Cc: Timur Tabi <timur@kernel.org>,
        Stanimir Varbanov <stanimir.varbanov@linaro.org>,
        linux-crypto@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>,
        Matt Mackall <mpm@selenic.com>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-arm-msm@vger.kernel.org
To: Vinod <vkoul@kernel.org>
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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@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt