Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt

From	Milan Broz <gmazyland@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt
Date	2017-03-01 14:10 +0100
Message-ID	<tgcb1-3ud-55@gated-at.bofh.it> (permalink)
References	(2 earlier) <tdyrn-5MV-5@gated-at.bofh.it> <tfXF0-1ys-13@gated-at.bofh.it> <tg87o-tP-17@gated-at.bofh.it> <tg8TL-179-13@gated-at.bofh.it> <tgc1j-3bp-11@gated-at.bofh.it>
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On 03/01/2017 01:42 PM, Gilad Ben-Yossef wrote:
...

> I can certainly understand if you don't wont to take the patch until
> we have results with
> dm-crypt itself but the difference between 8 separate invocation of
> the engine for 512
> bytes of XTS and a single invocation for 4KB are pretty big.

Yes, I know it. But the same can be achieved if we just implement
4k sector encryption in dmcrypt. It is incompatible with LUKS1
(but next LUKS version will support it) but I think this is not
a problem for now.

If the underlying device supports atomic write of 4k sectors, then
there should not be a problem.

This is one of the speed-up I would like to compare with the IV approach,
because everyone should benefit from 4k sectors in the end.
And no crypto API changes are needed here.

(I have an old patch for this, so I will try to revive it.)

Milan

Thread

Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Binoy Jayan <binoy.jayan@linaro.org> - 2017-02-22 07:20 +0100
  Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Milan Broz <gmazyland@gmail.com> - 2017-02-28 22:40 +0100
    Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Gilad Ben-Yossef <gilad@benyossef.com> - 2017-03-01 09:50 +0100
      Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Milan Broz <gmazyland@gmail.com> - 2017-03-01 10:40 +0100
        Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Gilad Ben-Yossef <gilad@benyossef.com> - 2017-03-01 14:00 +0100
          Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Milan Broz <gmazyland@gmail.com> - 2017-03-01 14:10 +0100
            Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Milan Broz <gmazyland@gmail.com> - 2017-03-01 16:40 +0100
              Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Gilad Ben-Yossef <gilad@benyossef.com> - 2017-03-06 15:40 +0100
          Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Ondrej Mosnacek <omosnace@redhat.com> - 2017-03-01 14:30 +0100
            Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt Gilad Ben-Yossef <gilad@benyossef.com> - 2017-03-02 15:10 +0100

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