From: Milan Broz <mbroz@redhat.com>
To: Stelios Bounanos <sb-lst@enotty.net>
Cc: dm-crypt@saout.de, linux-crypto@vger.kernel.org
Subject: Re: [dm-crypt] cryptsetup with arc4 cipher
Date: Wed, 05 Aug 2009 15:09:59 +0200 [thread overview]
Message-ID: <4A7984A7.40109@redhat.com> (raw)
In-Reply-To: <87zlaf3zl0.wl@obsidian.enotty.net>
Stelios Bounanos wrote:
> I was surprised to see arc4 perform so badly, particularly since
> "openssl speed" results tell a very different story. I decided to do
> some simple benchmarking of my own but I can't seem to get cryptsetup to
> work with arc4:
>
> # cryptsetup luksFormat --align-payload=512 -q -c arc4 /dev/sda4 key
> # cryptsetup luksOpen -d key /dev/sda4 ctest
> Command failed: No key available with this passphrase.
>
> The above commands work fine with aes. I can see arc4 in /proc/crypto.
>
> Any ideas?
There is apparently some problem in kernel, not sure if dm-crypt or crypto
api one, This ARC4 configuration is allowed (no errors) but produces something
more like random generator:-)
one sector device:
# dmsetup create x --table "0 1 crypt arc4-cbc-plain 0123456789abcdef 0 /dev/sdb 0"
# sha256sum /dev/mapper/x
d37afeeb57a60b69715edd99f2a1523e77f6be51a1c61c56efc91ed691c90dfc /dev/mapper/x
# sha256sum /dev/mapper/x
fdc87e8e9f158d26e58c5b48c80375b56cc24d0c088872f4aacc7e19fb5c5599 /dev/mapper/x
Not sure what's wrong yet...
Milan
--
mbroz@redhat.com
next parent reply other threads:[~2009-08-05 13:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87zlaf3zl0.wl@obsidian.enotty.net>
2009-08-05 13:09 ` Milan Broz [this message]
2009-08-05 20:30 ` [dm-crypt] cryptsetup with arc4 cipher Sebastian Andrzej Siewior
2009-08-06 7:46 ` Milan Broz
2009-08-06 8:38 ` Sebastian Andrzej Siewior
2009-08-06 9:19 ` Herbert Xu
[not found] ` <4A7A8A73.706-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2009-08-06 17:07 ` Stelios Bounanos
2009-08-08 3:10 ` [dm-crypt] " Herbert Xu
2009-08-08 3:08 ` Herbert Xu
2009-08-08 3:13 ` Herbert Xu
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