netdev - Re: [PATCH] [IPSEC]: Change the ICV length of sha256 to 128 bits

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Message-ID: <20081229204750.GA13680@gondor.apana.org.au>
Date:	Tue, 30 Dec 2008 07:47:50 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Martin Willi <martin@...ongswan.org>
Cc:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] [IPSEC]: Change the ICV length of sha256 to 128 bits

On Mon, Dec 29, 2008 at 02:05:19PM +0100, Martin Willi wrote:
>
> In PF_KEY, SADB_X_AALG_SHA2_256HMAC (5) was defined in
> draft-ietf-ipsec-ciph-sha-256-00 to 96 bit truncation (what is currently
> implemented). draft-ietf-ipsec-ciph-sha-256-01 defined it to 128 bit
> truncation (what is now RFC 4868).
> Those numbers starting from 12 are IKEv2 algorithm identifiers and are
> never passed to the kernel.

What are you talking about? Neither of those two drafts talks
about the ID used between the KM and the kernel.  So the PF_KEY
ID is simply irrelevant.

What is important though is what's deployed in the field with
respect to IKE.  All the BSDs support 96-bit truncation so we
should continue to do that as well.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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