linux-kernel - Re: [PATCH v7 4/7] crypto: add ecc curve and expose them

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Message-ID: <20210208212745.yi5shr4gkmdqy4xl@altlinux.org>
Date:   Tue, 9 Feb 2021 00:27:45 +0300
From:   Vitaly Chikunov <vt@...linux.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Stefan Berger <stefanb@...ux.ibm.com>,
        Meng Yu <yumeng18@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Zaibo Xu <xuzaibo@...wei.com>, wangzhou1@...ilicon.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Daniele Alessandrelli <daniele.alessandrelli@...ux.intel.com>,
        Mark Gross <mgross@...ux.intel.com>,
        "Khurana, Prabhjot" <prabhjot.khurana@...el.com>,
        "Reshetova, Elena" <elena.reshetova@...el.com>,
        Patrick Uiterwijk <patrick@...terwijk.org>
Subject: Re: [PATCH v7 4/7] crypto: add ecc curve and expose them

Ard,

On Mon, Feb 08, 2021 at 07:47:44AM +0100, Ard Biesheuvel wrote:
> On Mon, 8 Feb 2021 at 07:37, Vitaly Chikunov <vt@...linux.org> wrote:
> >
> > Herbert,
> >
> > On Fri, Jan 29, 2021 at 02:00:04PM +1100, Herbert Xu wrote:
> > > On Thu, Jan 28, 2021 at 09:49:41PM -0500, Stefan Berger wrote:
> > > >
> > > > In my patch series I initially had registered the akciphers under the names
> > > > ecc-nist-p192 and ecc-nist-p256 but now, in V4, joined them together as
> > > > 'ecdsa'. This may be too generic for a name. Maybe it should be called
> > > > ecsda-nist for the NIST family.
> > >
> > > What I'm proposing is specifying the curve in the name as well, i.e.,
> > > ecdsa-nist-p192 instead of just ecdsa or ecdsa-nist.
> > >
> > > This simplifies the task of handling hardware that only supports a
> > > subset of curves.
> >
> > So, if some implementation supports multiple curves (like EC-RDSA
> > currently supports 5 curves), it should add 5 ecrdsa-{a,b,c,..}
> > algorithms with actually the same top level implementation?
> > Right?
> >
> 
> Yes. The only difference will be the init() function, which can be
> used to set the TFM properties that define which curve is being used.
> The other routines can be generic, and refer to those properties if
> the behavior is curve-specific.

Thanks. This may be good!

JFYI. There is possible non-hardware accelerated implementations
for ECC algorithms which (perhaps) may never go to the kernel source,
because they are generated code. For example
  https://gitlab.com/nisec/ecckiila