From: Herbert Xu <herbert@gondor.apana.org.au>
To: Pascal Van Leeuwen <pvanleeuwen@verimatrix.com>
Cc: Milan Broz <gmazyland@gmail.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Horia Geanta <horia.geanta@nxp.com>,
"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
"dm-devel@redhat.com" <dm-devel@redhat.com>
Subject: Re: xts fuzz testing and lack of ciphertext stealing support
Date: Fri, 19 Jul 2019 09:47:26 +0800 [thread overview]
Message-ID: <20190719014726.erp3bf26oi4rducm@gondor.apana.org.au> (raw)
In-Reply-To: <MN2PR20MB2973DE83980D271CC847CA6BCAC80@MN2PR20MB2973.namprd20.prod.outlook.com>
On Thu, Jul 18, 2019 at 04:35:26PM +0000, Pascal Van Leeuwen wrote:
>
> Tthen there's still the issue of advancing that last tweak. From what I've seen,
> the xts implementation does not output the last tweak so you would have to
> recompute it locally in cts.c as block_cipher_enc(iv) * alpha^j. Which is wasteful.
> Of course this could be solved by redefining xts to output the last tweak
> like CBC/CTR output their last IV ... Which would probably give us HW guys
> trouble again because our HW cannot do *that* ... (While the HW very likely
> *does* implement the cipher text stealing properly, just to be able to boast
> about IEEE P1619 compliance ...)
If your hardware supports XTS properly then you wouldn't even need
to use this new template. You would directly export the xts
interface.
Cheers,
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
prev parent reply other threads:[~2019-07-19 1:47 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-16 17:46 xts fuzz testing and lack of ciphertext stealing support Horia Geanta
2019-07-16 22:16 ` Eric Biggers
2019-07-17 17:09 ` Horia Geanta
2019-07-17 17:28 ` Eric Biggers
2019-07-17 18:08 ` Ard Biesheuvel
2019-07-18 6:52 ` Herbert Xu
2019-07-18 7:15 ` Ard Biesheuvel
2019-07-18 7:21 ` Herbert Xu
2019-07-18 7:28 ` Ard Biesheuvel
2019-07-18 7:50 ` Herbert Xu
2019-07-18 7:40 ` Milan Broz
2019-07-18 10:40 ` Pascal Van Leeuwen
2019-07-18 11:19 ` Milan Broz
2019-07-18 15:27 ` Herbert Xu
2019-07-20 6:58 ` [dm-devel] " Eric Biggers
2019-07-20 7:35 ` Milan Broz
2019-07-21 9:50 ` Ard Biesheuvel
2019-07-22 9:44 ` Pascal Van Leeuwen
2019-07-22 16:43 ` Ard Biesheuvel
2019-07-22 22:46 ` Pascal Van Leeuwen
2019-07-24 12:23 ` Pascal Van Leeuwen
2019-07-24 12:50 ` Pascal Van Leeuwen
2019-07-24 16:10 ` Pascal Van Leeuwen
2019-07-25 6:22 ` Ard Biesheuvel
2019-07-25 7:49 ` Pascal Van Leeuwen
2019-07-25 8:01 ` Ard Biesheuvel
2019-07-26 10:31 ` Pascal Van Leeuwen
2019-07-26 19:59 ` Horia Geanta
2019-07-26 21:43 ` Pascal Van Leeuwen
2019-07-27 5:39 ` Ard Biesheuvel
2019-07-27 12:56 ` Pascal Van Leeuwen
2019-07-27 16:04 ` Milan Broz
2019-08-04 8:36 ` Ard Biesheuvel
[not found] ` <20f4832e-e3af-e3c2-d946-13bf8c367a60@nxp.com>
2019-08-07 15:51 ` Horia Geanta
2019-08-07 20:57 ` Pascal Van Leeuwen
2019-08-08 14:50 ` Horia Geanta
2019-08-09 8:35 ` Pascal Van Leeuwen
2019-08-08 13:43 ` Pascal Van Leeuwen
2019-08-08 18:01 ` Horia Geanta
2019-08-09 2:48 ` Herbert Xu
2019-08-09 6:45 ` Ard Biesheuvel
2019-08-09 7:44 ` Horia Geanta
2019-08-09 17:49 ` Ard Biesheuvel
2019-08-09 20:57 ` Pascal Van Leeuwen
2019-08-10 4:39 ` Ard Biesheuvel
2019-08-11 11:12 ` Milan Broz
2019-08-11 20:34 ` Eric Biggers
2019-08-11 21:39 ` Pascal Van Leeuwen
2019-08-11 21:29 ` Pascal Van Leeuwen
2019-08-12 4:51 ` Herbert Xu
2019-08-11 21:15 ` Pascal Van Leeuwen
2019-08-11 22:24 ` Ard Biesheuvel
2019-08-12 1:04 ` Pascal Van Leeuwen
2019-07-18 15:29 ` Herbert Xu
2019-07-18 15:43 ` Pascal Van Leeuwen
2019-07-18 15:51 ` Herbert Xu
2019-07-18 16:19 ` Ard Biesheuvel
2019-07-18 16:22 ` Herbert Xu
2019-07-18 17:03 ` Pascal Van Leeuwen
2019-07-19 5:34 ` Ard Biesheuvel
2019-07-19 7:29 ` Pascal Van Leeuwen
2019-07-19 17:14 ` Ard Biesheuvel
2019-07-19 20:07 ` Pascal Van Leeuwen
2019-07-18 16:35 ` Pascal Van Leeuwen
2019-07-19 1:47 ` Herbert Xu [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190719014726.erp3bf26oi4rducm@gondor.apana.org.au \
--to=herbert@gondor.apana.org.au \
--cc=ard.biesheuvel@linaro.org \
--cc=dm-devel@redhat.com \
--cc=gmazyland@gmail.com \
--cc=horia.geanta@nxp.com \
--cc=linux-crypto@vger.kernel.org \
--cc=pvanleeuwen@verimatrix.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).