linux-kernel - Re: [RFC PATCH v2 11/12] crypto: adiantum

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Message-ID: <20181030081724.GA2730@gondor.apana.org.au>
Date:   Tue, 30 Oct 2018 19:17:24 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>, linux-fscrypt@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Crowley <paulcrowley@...gle.com>,
        Greg Kaiser <gkaiser@...gle.com>,
        Michael Halcrow <mhalcrow@...gle.com>,
        "Jason A . Donenfeld" <Jason@...c4.com>,
        Samuel Neves <samuel.c.p.neves@...il.com>,
        Tomer Ashur <tomer.ashur@...t.kuleuven.be>
Subject: Re: [RFC PATCH v2 11/12] crypto: adiantum - add Adiantum support

On Wed, Oct 24, 2018 at 03:06:17PM -0700, Eric Biggers wrote:
>
> The patch I've been using just exposes a file /proc/cryptobench (note: it maybe
> should be made into a char device instead) to which you can write commands like:
> 
> 	algtype=skcipher algname=adiantum(xchacha12,aes) keysize=32 bufsize=4096 niter=1000
> 
> Then userspace reads back the result:
> 
> 	SUCCESS algname=adiantum(xchacha12,aes) driver_name=adiantum(xchacha12-software,aes-aesni,nhpoly1305-generic) measurement=0x30a5abd5776e0af enc_time=44831104 dec_time=38303077
> 
> It's then pretty straightforward to wrap this API in a userspace script that
> does all the benchmarks you need, and formats the results nicely.
> 
> For correctness testing there's also an option 'sgl_fuzz' that randomizes the
> scatterlist division.
> 
> Currently the patch is missing some features such as AEAD support, but at some
> point I'd like to get it into a state where it can be included upstream.

I completely agree that a new interface would be much better for
tcrypt.

However, we're trying to avoid using /proc for new APIs.  So perhaps
netlink would be a better choice given the existing configuration and
stats APIs that already exist for it.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt