linux-kernel - Re: [CRYPTO] is it really optimized ?

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Message-ID: <38b2ab8a0704140615y2ba8145bmd3c2316a41d99265@mail.gmail.com>
Date:	Sat, 14 Apr 2007 15:15:13 +0200
From:	"Francis Moreau" <francis.moro@...il.com>
To:	"Herbert Xu" <herbert@...dor.apana.org.au>
Cc:	helge.hafting@...el.hist.no, linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org
Subject: Re: [CRYPTO] is it really optimized ?

Hi,

On 4/14/07, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> It should be easy to restrict a crypto device so that it's used
> by one specific user.  That's why we have generic names ("aes") vs.
> specific ones ("aes-foo").
>
> So if you let the priority user pick "aes-foo" instead of "aes",
> and given that there is a higher priority variant of the generic
> "aes" registered, the system will do exactly what you want.
>

hmm yes indeed it should do the job, but I don't see how you do that.
For example, let say I want to use "aes-foo" with eCryptfs. I can give
a higher priority to "aes-foo" than "aes" one. When eCryptfs asks for
a aes cipher it will pass "aes" name and since "aes-foo" has a higher
priority then the cypto core will return "aes-foo" cipher, right ? But
in this scheme, eCryptfs has not a higher priority than other kernel
users. How can I prevent others to use "aes-foo" ?

Actually I'd like to say "'aes-foo' is a cipher used by one and only
one user". That would allow aes-foo driver to no reload the same key
for each block and to be more efficient for my common case.

thanks
-- 
Francis
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