linux-kernel - Re: [PATCH v2] crypto: sun4i-ss: support the Security System PRNG

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Message-ID: <CANc+2y5zegViTsPnuWZwWLUwdRk+ac6upaWOjH7iRFL_zEBxGg@mail.gmail.com>
Date:   Tue, 13 Dec 2016 20:53:54 +0530
From:   PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
        maxime.ripard@...e-electrons.com, Chen-Yu Tsai <wens@...e.org>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] crypto: sun4i-ss: support the Security System PRNG

> What do you think about those two solutions ?

I prefer the second solution's idea of using two files (/dev/hwrng and
/dev/hwprng). Upon having a quick glance it looks like (based on
current_rng == prng check) that your current implementation allows
only one rng device to be in use at a time. It would be better to have
both usable at the same time. So applications that need pseudo random
data at high speed can use /dev/prng while applications that require
true random number can use /dev/rng. Please feel free to correct if my
understanding of the code is incorrect. Along with this change I think
changing the algif_rng to use this code if this solution is going to
be used.

Regards,
PrasannaKumar