linux-kernel - Re: [PATCH] crypto: mark cts(cbc(aes)) as FIPS allowed

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Date:   Mon, 05 Nov 2018 11:30:12 +0100
From:   Stephan Mueller <smueller@...onox.de>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Gilad Ben-Yossef <gilad@...yossef.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Miller <davem@...emloft.net>,
        Ofir Drang <Ofir.Drang@....com>,
        Yael Chemla <Yael.Chemla@....com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] crypto: mark cts(cbc(aes)) as FIPS allowed

Am Montag, 5. November 2018, 11:20:28 CET schrieb Ard Biesheuvel:

Hi Ard, Gilad,

> On 5 November 2018 at 10:18, Gilad Ben-Yossef <gilad@...yossef.com> wrote:
> > Hi Stephan,
> > 
> > On Mon, Nov 5, 2018 at 10:50 AM Stephan Mueller <smueller@...onox.de> 
wrote:
> >> Am Sonntag, 4. November 2018, 11:05:24 CET schrieb Gilad Ben-Yossef:
> >> 
> >> Hi Gilad,
> >> 
> >> > As per Sp800-38A addendum from Oct 2010[1], cts(cbc(aes)) is
> >> > allowed as a FIPS mode algorithm. Mark it as such.
> >> > 
> >> > [1] https://csrc.nist.gov/publications/detail/sp/800-38a/addendum/final
> >> 
> >> There are several types of CTS approaches. Only three of those are listed
> >> in the SP800-38A addendum. The source code only refers to some RFCs.
> >> 
> >> Did you check whether the CTS implementation matches one or more of the
> >> types listed in the addendum? If yes, may I suggest to add a small
> >> statement in the code noting this fact?
> > 
> > Yes, AFAIK the software implements CBC-CS3 as described in the document.
> > You have a very good point about this not document anywhere. I will
> > send a patch.
> 
> I agree that it makes sense to document this.

Thanks for adding this. With this statement, the initial patch of adding the 
fips_allowed flag is:

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

Ciao
Stephan