linux-kernel - Re: [PATCH] crypto: don't raise alarm for no ctr(aes*) tests in fips mode

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Message-Id: <200905041456.59427.jarod@redhat.com>
Date:	Mon, 4 May 2009 14:56:58 -0400
From:	Jarod Wilson <jarod@...hat.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH] crypto: don't raise alarm for no ctr(aes*) tests in fips mode

On Monday 04 May 2009 07:10:10 Herbert Xu wrote:
> On Tue, Apr 28, 2009 at 09:18:22PM -0400, Jarod Wilson wrote:
> > Per the NIST AESAVS document, Appendix A[1], it isn't possible to
> > have automated self-tests for counter-mode AES, but people are
> > misled to believe something is wrong by the message that says there
> > is no test for ctr(aes). Simply suppress all 'no test for ctr(aes*'
> > messages if fips_enabled is set to avoid confusion.
> 
> This is not true at all.  In our implementation the counter is
> set through the IV so it definitely is possible to test counter
> mode algorithms in Linux.

Ah... Now I think I see... We can provide an initial counter w/o a
problem, but counter incrementation is implementation-specific, so
we can't have automated tests that cover multiple enc/dec ops, but
if we limit ourselves to just one op, self-tests should be perfectly
doable, and NIST SP 800-38A, Appendix F.5 has vectors we could make
use of (using just the block #1 values). At least, spot-checking
the vectors, I'm getting the expected results for the 1st block.

Okay, I'll whip something up in a sec.

-- 
Jarod Wilson
jarod@...hat.com
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