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

[Tim Chen]

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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