linux-kernel - Re: Crypto API Weirdnesses

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Message-ID: <alpine.LFD.0.999.0707311916150.26032@enigma.security.iitk.ac.in>
Date:	Tue, 31 Jul 2007 19:23:48 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Felipe Balbi <felipebalbi@...rs.sourceforge.net>
cc:	Akinobu Mita <akinobu.mita@...il.com>,
	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-crypto@...r.kernel.org, dm-devel@...hat.com
Subject: Re: Crypto API Weirdnesses

Hi,


On Tue, 31 Jul 2007, Felipe Balbi wrote:

> On 7/31/07, Akinobu Mita <akinobu.mita@...il.com> wrote:
> > > > "Failed to setup dm-crypt key mapping.
> > > > Check kernel for support for the aes-cbc-essiv:sha256 cipher spec and
> > > > verify that /dev/hda4 contains at least 133 sectors.
> > > > Failed to read from key storage"
> > >
> > > Looks like a "cryptsetup" error message, not kernel's.
> >
> > I can't find CONFIG_DM_CRYPT in the .config.
> > Maybe cryptsetup needs it.
> 
> yeah... it was that... working ;-)

Ugh, you should at least be checking if you've built the kernel with the
same config options :-) Of course, if you did a simple "make oldconfig"
but still lost some config options, then that's definitely a regression...
(was that the case here, btw?)


> btw... why DM_CRYPT is below "Multi-Devices" menu and not in
> "Cryptographic Options"?

Well, DM_CRYPT /is/ a device-mapper target first. "Cryptographic options"
is for _actual_ crypto code, such as algorithm implementations etc. Users
such as encrypting file systems / IPsec / dm-crypt are better off at their
logical places, I'd say.


Satyam
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