linux-kernel - Re: [PATCH 1/4] crypto: drbg - ensure most preferred type is FIPS health checked

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Message-ID: <2739240.yfhAjsIXQE@tauon.chronox.de>
Date:   Mon, 30 Oct 2023 11:19:17 +0100
From:   Stephan Mueller <smueller@...onox.de>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Dimitri John Ledkov <dimitri.ledkov@...onical.com>
Cc:     simo@...hat.com, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] crypto: drbg - ensure most preferred type is FIPS health
 checked

Am Sonntag, 29. Oktober 2023, 21:48:20 CET schrieb Dimitri John Ledkov:

Hi Dimitri,

> drbg supports multiple types of drbg, and multiple parameters of
> each. Health check sanity only checks one drbg of a single type. One
> can enable all three types of drbg. And instead of checking the most
> preferred algorithm (last one wins), it is currently checking first
> one instead.

The purpose of the sanity check is to make sure the various thresholds are 
effective. For this, you need "a" DRBG, no matter which one.
> 
> Update ifdef to ensure that healthcheck prefers HMAC, over HASH, over
> CTR, last one wins, like all other code and functions.

I can see that this patch makes the code more consistent with the rest. Yet, I 
would doubt the "Fixes" indicator below is needed, though.

Anyhow:

Reviewed-by: Stephan Mueller <smueller@...onox.de>

Ciao
Stephan