linux-kernel - Re: [PATCH v1] crypto: caam

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Message-ID: <20170803031652.GA10515@gondor.apana.org.au>
Date:   Thu, 3 Aug 2017 11:16:52 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Horia Geantă <horia.geanta@....com>
Cc:     Harald Freudenberger <freude@...ux.vnet.ibm.com>,
        Oleksij Rempel <ore@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Dan Douglass <dan.douglass@....com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v1] crypto: caam - set hwrng quality level

On Wed, Aug 02, 2017 at 02:03:14PM +0000, Horia Geantă wrote:
>
> Take CAAM's engine HWRNG: it can work both as a TRNG and as a
> TRNG-seeded DRBG (that's how it's currently configured).
> IIUC, both setups are fit as source for the entropy pool.

So which is it? If it's a DRBG then it should not be exposed through
the hwrng interface.  Only TRNG should go through hwrng.  DRBGs
can use the crypto rng API.

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