linux-kernel - Re: [PATCH v1] crypto: Make the DRBG compliant with NIST SP800-90A rev1

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Message-ID: <a4e1c071-32af-9650-e6fd-8943b3a79bb0@linux.microsoft.com>
Date:   Wed, 23 Jun 2021 10:00:29 -0700 (PDT)
From:   James Morris <jamorris@...ux.microsoft.com>
To:     Stephan Mueller <smueller@...onox.de>
cc:     Mickaël Salaün <mic@...ikod.net>,
        David Miller <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        John Haxby <john.haxby@...cle.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Simo Sorce <simo@...hat.com>, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Mickaël Salaün <mic@...ux.microsoft.com>,
        hpa@...or.com, tytso@....edu
Subject: Re: [PATCH v1] crypto: Make the DRBG compliant with NIST SP800-90A
 rev1

On Wed, 23 Jun 2021, Stephan Mueller wrote:

> 
> > These changes replace the use of the Linux RNG with the Jitter RNG,
> > which is NIST SP800-90B compliant, to get a proper entropy input and a
> > nonce as defined by FIPS.
> 
> Can you please help me understand what is missing in the current code which
> seemingly already has achieved this goal?

The advice we have is that if an attacker knows the internal state of the 
CPU, then the output of the Jitter RNG can be predicted.



-- 
James Morris
<jamorris@...ux.microsoft.com>