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

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Message-ID: <20210208063541.ribifj3445djxfy5@altlinux.org>
Date:   Mon, 8 Feb 2021 09:35:41 +0300
From:   Vitaly Chikunov <vt@...linux.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Stefan Berger <stefanb@...ux.ibm.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        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

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?


> There is a parallel discussion of exactly what curves we should
> support in the kernel.  Personally if there is a user in the kernel
> for it then I'm happy to see it added.  In your specific case, as
> long as your use of the algorithm in x509 is accepted then I don't
> have any problems with adding support in the Crypto API.
> 
> Cheers,
> -- 
> 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