linux-kernel - Re: [RFC] crypto: exynos - Icrease the priority of the driver

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Message-ID: <2500626.C7ppcC6VU6@tauon.chronox.de>
Date:   Tue, 05 Dec 2017 14:48:35 +0100
From:   Stephan Mueller <smueller@...onox.de>
To:     Łukasz Stelmach <l.stelmach@...sung.com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>, robh+dt@...nel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Kukjin Kim <kgene@...nel.org>, linux-crypto@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        m.szyprowski@...sung.com, b.zolnierkie@...sung.com
Subject: Re: [RFC] crypto: exynos - Icrease the priority of the driver

Am Dienstag, 5. Dezember 2017, 13:42:14 CET schrieb Łukasz Stelmach:

Hi Łukasz,

> exynos-rng is one of many implementations of stdrng. With priority as
> low as 100 it isn't selected, if software implementations (DRBG) are
> available.

What about using 300? The reason is the following: in the normal case, the 
software PRNGs have 100 (X9.31) and 200 (SP800-90A DRBG). Thus, in normal 
case, the hardware takes precedence.

In FIPS mode, the DRBG prio is increased by 200. As in FIPS mode you must have 
a DRBG and assuming that the hardware does not implement a DRBG, the software 
DRBG should be used as otherwise you have a FIPS-problem.

Ciao
Stephan