netdev - Re: CCM/GCM implementation defect

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Date:	Thu, 23 Apr 2015 11:58:52 +0200
From:	Martin Willi <martin@...ongswan.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Horia Geantă <horia.geanta@...escale.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Paul Wouters <pwouters@...hat.com>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: CCM/GCM implementation defect

Hi Herbert,

> > Does this mean that even the test vectors (crypto/testmgr.h) are broken?
> 
> Indeed.  The test vectors appear to be generated either through
> our implementation or by one that is identical to us.

I'm not sure about that. RFC4106 refers to [1] for test vectors, which
is still available at web.archive.org [2].

When looking for example at Test Case 3, this is the same as in a newer
revision of the document [3]. That looks exactly the same as
aes_gcm_enc_tv_template[2] from testmgr.h.

We by the way use test vectors in userland from the same document to
verify our own GCM backend, our OpenSSL backend and an AESNI/PCLMULQD
backend. And I've never heard of any incompatibilities.

Regards
Martin

[1]http://csrc.nist.gov/CryptoToolkit/modes/proposedmodes/gcm/gcm-spec.pdf
[2]http://web.archive.org/web/20070712195408/http://csrc.nist.gov/CryptoToolkit/modes/proposedmodes/gcm/gcm-spec.pdf
[3]http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-revised-spec.pdf

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