From: Herbert Xu Subject: Re: [PATCH 3/3] hwrng: msm - Add support for prng v2 Date: Fri, 22 Jun 2018 22:38:29 +0800 Message-ID: <20180622143829.rd2ys6ci7q3aupst@gondor.apana.org.au> References: <20180618141259.23141-1-vkoul@kernel.org> <20180618141259.23141-4-vkoul@kernel.org> <20180619142853.wgi5easw4zv6ttrb@gondor.apana.org.au> <966e9cd4-70a3-8d54-df0f-16df3df45fb5@linaro.org> <20180621101506.rnklbtapvfdev4xb@gondor.apana.org.au> <20180621115312.rfmbitrhqi44wu5w@gondor.apana.org.au> <6782b1c0-ea94-b07c-2fae-3fe3223bb22a@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Vinod Koul , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, Matt Mackall , Arnd Bergmann , Greg Kroah-Hartman , linux-arm-msm@vger.kernel.org, Vinod Koul To: Stanimir Varbanov Return-path: Content-Disposition: inline In-Reply-To: <6782b1c0-ea94-b07c-2fae-3fe3223bb22a@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org 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 Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt