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

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Message-ID: <98006AFB-C40E-46F7-BE88-D8E66653B71B@zytor.com>
Date:   Wed, 23 Jun 2021 13:49:24 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     James Morris <jamorris@...ux.microsoft.com>,
        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>,
        tytso@....edu
Subject: Re: [PATCH v1] crypto: Make the DRBG compliant with NIST SP800-90A rev1

This one really does keep coming back like yesterday's herring, doesn't it...

On June 23, 2021 10:00:29 AM PDT, James Morris <jamorris@...ux.microsoft.com> wrote:
>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.

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