linux-kernel - Re: [RFC PATCH crypto 4/4] AES-NI: Add support to Intel AES-NI instructions for x86

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Date:	Mon, 12 Jan 2009 14:55:10 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Sebastian Siewior <linux-crypto@...breakpoint.cc>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Subject: Re: [RFC PATCH crypto 4/4] AES-NI: Add support to Intel AES-NI
	instructions for x86_64 platform

On Fri, 2009-01-09 at 15:01 +0800, Herbert Xu wrote:
> Actually I was thinking of something as simple as just using
> cryptd as is.  That is, register a blkcipher algorithm for your
> version of cbc-aes, but don't register under the name cbc(aes),
> e.g., register it under the name of __cbc-aes-aesni for both alg
> name and driver name.  You can register it under cbc(aes) too
> if you add the fallback in there.
> 
> Then for the real thing, just allocate the blkcipher __cbc_*,
> plus the ablkcipher cryptd(__cbc_*), and invoke the right one
> depending on caller context.

One more question:

I use a "shell" cbc(aes) algorithm which chooses between
cryptd(__cbc-aes-aesni) and __cbc-aes-aesni according to context. But
the struct ablkcipher_request passed in can not be used for cryptd(*).
This can be resolved by allocating another struct ablkcipher_request for
cryptd(*) for each incoming struct ablkcipher_request. But is there any
better solution?

Best Regards,
Huang Ying

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