linux-kernel - Re: [PATCH] xfrm: fix hmac(sha256) truncation length

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Message-ID: <20120309134541.GA28309@gondor.apana.org.au>
Date:	Sat, 10 Mar 2012 00:45:42 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jarod Wilson <jarod@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Paul Wouters <pwouters@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Martin Willi <martin@...ongswan.org>, netdev@...r.kernel.org,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH] xfrm: fix hmac(sha256) truncation length

On Fri, Mar 09, 2012 at 08:41:10AM -0500, Jarod Wilson wrote:
>
> Okay, I suspected that might be the case. No plans to ever invert that,  
> so that userspace has to explicitly set the shorter truncbits for  
> backwards compat?

That's up to the userspace implementation.  If its configuration
allows explicit trunc bits then just use whatever the user says.
Otherwise it'll have to make a policy decision.  For example, a
big warning when upgrading and changing the default to the correct
value.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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