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From: "Jérémy Jean" <jeremy.jean@oss.cyber.gouv.fr>
To: Ignat Korchagin <ignat@linux.win>
Cc: Lukas Wunner <lukas@wunner.de>,
	Stefan Berger <stefanb@linux.ibm.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"David S. Miller" <davem@davemloft.net>,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] crypto: ecc - Handle exceptional points in Shamir multiplication
Date: Sat, 26 Sep 2026 22:18:01 +0200	[thread overview]
Message-ID: <941ea3bacafb6c6dcc0edfe96a3f3fcd@oss.cyber.gouv.fr> (raw)
In-Reply-To: <CAOs+rJWUi+Lr-G9NcOzStqPQyCG_L8HC2ZTa6QZBTGD+AAQKSA@mail.gmail.com>

On 2026-09-26 16:17, Ignat Korchagin wrote:
> On Fri, Sep 25, 2026 at 2:23 PM Jérémy Jean
> <Jeremy.Jean@oss.cyber.gouv.fr> wrote:
>> 
>> Shamir multiplication mishandles equal points, opposite points and the
>> point at infinity. This rejects valid ECDSA signatures and can accept
>> invalid digest/signature tuples when the public key is G or -G. The
> 
> Can you provide/construct test vectors for these? The ones that were
> accepted, but should fail.

Hello Ignat,

Thanks for the answer.
Good idea, I will add some in a v2.

Jérémy

      reply	other threads:[~2026-09-26 20:18 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-25 13:22 Jérémy Jean
2026-09-26 14:17 ` Ignat Korchagin
2026-09-26 20:18   ` Jérémy Jean [this message]

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