linux-kernel - Re: [PATCH] crypto: add ctr(aes) test vectors

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Date:	Tue, 5 May 2009 09:55:24 -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: add ctr(aes) test vectors

On Tuesday 05 May 2009 09:18:35 Herbert Xu wrote:
> On Mon, May 04, 2009 at 04:24:44PM -0400, Jarod Wilson wrote:
> >
> > Indeed, the first enc/dec operation after we set the counter *is*
> > completely deterministic across all implementations, the AESAVS
> > is referring to tests with multiple operations, which aren't
> > possible, due to varying implementations of counter increment
> > routines. This patch adds test vectors for ctr(aes), using the
> > first block input values from Appendix F.5 of NIST Special Pub
> > 800-38A.
> 
> Well, our ctr(aes) must be completely deterministic as it is
> used as the base for CCM and GCM.  In fact, if it weren't so
> then you can't use it for anything since two implementations
> may produces different outputs.

Yeah, that makes sense, I believe I finally see the light.

> So if you could resend some vectors that test multiple blocks
> then I'll happily add them.

Multi-block test vectors coming shortly, passing in all the input
blocks from F.5 of 800-38A is spitting back the expected answers
for ever block.

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