linux-kernel - Re: [BUGFIX] crypto: Fix ctr(aes) testing by specifying geniv

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Message-ID: <20090814010527.GA1653@gondor.apana.org.au>
Date:	Fri, 14 Aug 2009 11:05:27 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Huang Ying <ying.huang@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Subject: Re: [BUGFIX] crypto: Fix ctr(aes) testing by specifying geniv

On Fri, Aug 14, 2009 at 09:01:07AM +0800, Huang Ying wrote:
>
> I see seqiv is used in rfc3686 mode, it means seqiv can not be used on
> raw counter mode but can be used for rfc3686?

Yeah, with rfc3686 a portion of the counter is available for
counting bytes within each request.  This allows a sequential
IV to be safely used as each IV is essentially 2^32 blocks apart.

With raw counter mode as soon as you process two blocks in one
request the next IV would collide with one that has alreay been
used.

Cheers,
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