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

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Date:	Fri, 11 Dec 2015 08:54:40 -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 Fri, 2015-12-11 at 11:23 +0800, Herbert Xu wrote:
> On Thu, Dec 10, 2015 at 08:39:45AM -0800, Tim Chen wrote:
> >
> > 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);
> 
> We should avoid bypassing the API and directly calling crypto
> driver functions like this.
> 
> What if you made it a proper ablkcipher and just called it through
> the API?
> 
> Thanks,

Direct call I assume have less overhead.  Let me think about
making the inner cipher ablkcipher.  I may need to rewrite a lot
of the glue layer :(

Tim

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