From: Milan Broz <mbroz@redhat.com>
To: Bai Shuwei <baishuwei@gmail.com>
Cc: linux-crypto@vger.kernel.org
Subject: Re: how the key is generated?
Date: Tue, 26 Jan 2010 09:58:24 +0100 [thread overview]
Message-ID: <4B5EAEB0.9040205@redhat.com> (raw)
In-Reply-To: <f3566d61001260041s13286706ra5c032ea2b4ce1d6@mail.gmail.com>
On 01/26/2010 09:41 AM, Bai Shuwei wrote:
> Hello, everyone:
> i add one line in the setkey function which is in xts.c file to
> print the in_key value. I find the key value not same i set in the
> keyfile by cryptsetup
>
> my command is
> # cryptsetup luksFormat -d my_keyfile -c xts-aes-plain -s 256 /dev/loop0
-d is key file for key slot (passphrase), volume (master) key for encryption
is generated using RNG during luksFormat inside cryptsetup.
You can use pre-generated master key using --master-key-file in cryptsetup 1.1.x
(but note it reads raw input, not hexa encoding). See man page.
You do not need to modify xts.c btw, try "dmsetup table --showkeys" for active
dm-crypt mappings to show used volume key.
(and also better use dm-crypt@saout.de mailing list for questions related to
userspace cryptsetup)
Milan
--
mbroz@redhat.com
next prev parent reply other threads:[~2010-01-26 8:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-26 8:41 how the key is generated? Bai Shuwei
2010-01-26 8:58 ` Milan Broz [this message]
2010-01-27 3:21 ` Bai Shuwei
2010-01-27 8:21 ` Milan Broz
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