From: PrasannaKumar Muralidharan Subject: Re: [PATCH v2] crypto: sun4i-ss: support the Security System PRNG Date: Thu, 15 Dec 2016 00:47:16 +0530 Message-ID: References: <1480934922-20732-1-git-send-email-clabbe.montjoie@gmail.com> <20161205123705.GA10732@gondor.apana.org.au> <20161205125738.GA13525@Red> <20161207120900.GC20680@gondor.apana.org.au> <20161207125127.GB28218@Red> <20161208090618.GB22932@gondor.apana.org.au> <20161213141059.GB10647@Red> <20161214050551.GD9592@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, Chen-Yu Tsai , Corentin Labbe , linux-crypto@vger.kernel.org, maxime.ripard@free-electrons.com, davem@davemloft.net, linux-arm-kernel@lists.infradead.org To: Herbert Xu Return-path: In-Reply-To: <20161214050551.GD9592@gondor.apana.org.au> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org List-Id: linux-crypto.vger.kernel.org >> I have found two solutions: > > No we already have algif_rng so let's not confuse things even > further by making hwrng take PRNGs. Even if both the solutions could not be adopted I think there must be a way for applications to use similar API to get true rng or prng. Given the case that no user complained about prng data when using /dev/hwrng is it safe to assume that the random data generated is acceptable for users? If so, the drivers can be left without any modification. Should there be a mandate that driver will be accepted only when it passes 'rngtest'. This will make sure that prng drivers won't get added in future. Regards, PrasannaKumar