linux-kernel - Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code

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Date:	Thu, 10 Dec 2015 08:39:45 -0800
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"David S.Miller" <davem@...emloft.net>,
	Stephan Mueller <smueller@...onox.de>,
	Chandramouli Narayanan <mouli_7982@...oo.com>,
	Vinodh Gopal <vinodh.gopal@...el.com>,
	James Guilford <james.guilford@...el.com>,
	Wajdi Feghali <wajdi.k.feghali@...el.com>,
	Jussi Kivilinna <jussi.kivilinna@....fi>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code

On Thu, 2015-12-10 at 09:45 +0800, Herbert Xu wrote:
> On Wed, Dec 09, 2015 at 09:23:14AM -0800, Tim Chen wrote:
> > 
> > This is an internal algorithm.  We are indeed casting the request
> > to the outer ablkcipher request when we do the async cipher walk.
> 
> The question remain: why does it have to be a blkcipher rather
> than an ablkcipher?
> 
> Cheers,

The inner cipher is called synchronously from the outer layer 
async cipher algorithm in cbc_mb_async_ablk_decrypt via

        err = crypto_blkcipher_crt(child_tfm)->decrypt(
                &rctx->desc, req->dst, req->src, req->nbytes);

or directly by mcrytpd_queue_worker via mcryptd_blkcipher_crypt. We
do not allow this operation to return something like EINPROGRESS.  

But the walk of the scattered list is done with async walk.

Thanks.

Tim

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