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

From	Tim Chen <tim.c.chen@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code
Date	2015-12-11 00:50 +0100
Message-ID	<qEj8d-4Em-11@gated-at.bofh.it> (permalink)
References	<qBlSW-3wb-9@gated-at.bofh.it> <qBlSW-3wb-23@gated-at.bofh.it> <qDD8Z-2iB-5@gated-at.bofh.it> <qDQIX-2Tz-29@gated-at.bofh.it> <qDYwO-7Pf-11@gated-at.bofh.it>
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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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Thread

[PATCH v4 5/5] crypto: AES CBC multi-buffer glue code Tim Chen <tim.c.chen@linux.intel.com> - 2015-12-02 21:10 +0100
  Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code Herbert Xu <herbert@gondor.apana.org.au> - 2015-12-09 04:00 +0100
    Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code Tim Chen <tim.c.chen@linux.intel.com> - 2015-12-09 18:30 +0100
      Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code Herbert Xu <herbert@gondor.apana.org.au> - 2015-12-10 02:50 +0100
        Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code Tim Chen <tim.c.chen@linux.intel.com> - 2015-12-11 00:50 +0100
          Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code Herbert Xu <herbert@gondor.apana.org.au> - 2015-12-11 04:30 +0100
            Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code Tim Chen <tim.c.chen@linux.intel.com> - 2015-12-11 18:00 +0100

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