linux-kernel - Re: [PATCH 0/5] crypto: add IV generation templates

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Message-ID: <20180720123246.GE10784@sirena.org.uk>
Date:   Fri, 20 Jul 2018 13:32:46 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        Arnd Bergmann <arnd@...db.de>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>, dm-devel@...hat.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jonathan Cameron <jonathan.cameron@...wei.com>
Subject: Re: [PATCH 0/5] crypto: add IV generation templates

On Fri, Jul 20, 2018 at 09:23:15PM +0900, Ard Biesheuvel wrote:
> On 20 July 2018 at 20:45, Mark Brown <broonie@...nel.org> wrote:

> > I have to confess I didn't look at their in tree driver, looking briefly
> > now it looks awfully like the hardware should be able to chain IV
> > generation together with encryption without bothering the CPU which
> > would be good enough.

> Indeed interesting. But afaict, that would still mean that the IV
> generation transform and the payload transform would be expressed as a
> single crypto algorithm, e.g., 'dm(essiv-foo(aes),gcm(aes)), or the DM
> layer would still need to be involved in sequencing one operation
> after the other, and I don't think any of that support is in the
> current series. But I'm just a drive by reviewer here, so please
> correct me if I am wrong.

Yeah, I'm also a bit of a drive by here and not seeing how the two are
joined up at present, but it may be a case of needing to get this and/or
other drivers fixed rather than the hardware lacking the capability.

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