IETF Logo Mail Archive

[CFRG] Re: Prehashing in EdDSA vs ML-DSA

Daniel Huigens <daniel.huigens@proton.ch> Mon, 02 September 2024 12:05 UTC

Return-Path: <daniel.huigens@proton.ch>
X-Original-To: cfrg@ietfa.amsl.com
Delivered-To: cfrg@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C2351C151082 for <cfrg@ietfa.amsl.com>; Mon, 2 Sep 2024 05:05:56 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -7.104
X-Spam-Level:
X-Spam-Status: No, score=-7.104 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_ZEN_BLOCKED_OPENDNS=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, URIBL_BLOCKED=0.001, URIBL_DBL_BLOCKED_OPENDNS=0.001, URIBL_ZEN_BLOCKED_OPENDNS=0.001] autolearn=unavailable autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=proton.ch
Received: from mail.ietf.org ([50.223.129.194]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TnblUlWpwSwQ for <cfrg@ietfa.amsl.com>; Mon, 2 Sep 2024 05:05:52 -0700 (PDT)
Received: from mail-4323.proton.ch (mail-4323.proton.ch [185.70.43.23]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EC43AC151094 for <cfrg@irtf.org>; Mon, 2 Sep 2024 05:05:51 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=proton.ch; s=xkdir4fbivb7fos3esvk7qhbpm.protonmail; t=1725278749; x=1725537949; bh=oTMt3hlsf59/grngLmgbVwVeUGKVK3FrZcIrjLEE8gY=; h=Date:To:From:Cc:Subject:Message-ID:In-Reply-To:References: Feedback-ID:From:To:Cc:Date:Subject:Reply-To:Feedback-ID: Message-ID:BIMI-Selector; b=lZqau/Q6rho7NBuRIhJUKWFMoHdKUORGd8xwNBC2CPMvVL8FLShxue5l1cG7r6jQD Z9cJv5s3dMQWdJxCDL0XpuofDHGQZ++umHdPz1TDAiUwzblim4Par8xiNvO2A9WBt4 DbqcbLrWK4pY6V+aOdP2anBqzIYKE0EUSfCiEO1XT8VFD9L2OUdG+AkUwaeSHPJklc RoJnfaYz9/VMD3PD/yTpLAnjdUQkATXOEHULx6kcx5cR5Ri5Uu2+XUzY81KREitNU1 vollwsWrnFKXjH3IaCpeIPrO29oH4ngOYZulMprVwIkTP8cvb8IL879JbdEAXoSoIf 88efUtwS61Hyg==
Date: Mon, 02 Sep 2024 12:05:45 +0000
To: Phillip Hallam-Baker <phill@hallambaker.com>
From: Daniel Huigens <daniel.huigens@proton.ch>
Message-ID: <dqxsAV_fceTz3H_kM1Ozp65vj9pGROzk4s_A6_KHPih-qSIawWRO2pLoMcOplezj97ZGf00LusXVaDKb9uo9Q3bl5ZolPKkBHglxsd87iww=@proton.ch>
In-Reply-To: <tB3-qv9s-8TF9KAZTsNtvLlhF3ZQ2u42UbZK7x9gm1xfuzflfBPIkjqiNgZWCGuEaXovyxv7-uLjdhlsiMfvpPLf6oZzLFeOknQhFNhTWJw=@proton.ch>
References: <CAMm+LwjEgPEVViySRY1HRe2EOHSAvQsfSetvpJko7ORzcDX2BQ@mail.gmail.com> <6G17q5T00hEi3vAiSOJs5qKpkTAlaEfN3apVelFbTLKSQbXkqa-CSIa1w-HWK93gZSE3V25G_zPODhhw455OYqQmgIMk00rbYSztouk2dYg=@proton.ch> <CAMm+LwjvYL1vxNQi7y+WT4hyv0vts-=2YR=hvRBkyLLpLWQFQQ@mail.gmail.com> <tB3-qv9s-8TF9KAZTsNtvLlhF3ZQ2u42UbZK7x9gm1xfuzflfBPIkjqiNgZWCGuEaXovyxv7-uLjdhlsiMfvpPLf6oZzLFeOknQhFNhTWJw=@proton.ch>
Feedback-ID: 37000915:user:proton
X-Pm-Message-ID: 2cebfaa8bab0b26c4e1c412225f4af3f8e2fc617
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="b1_EBu2yR8GkO6apjvFIFy18dpvivyW3OYJ1A4MT0V5s"
Message-ID-Hash: GTRCFMN7VZ64OFX5UKXDODLCO4DHKDLJ
X-Message-ID-Hash: GTRCFMN7VZ64OFX5UKXDODLCO4DHKDLJ
X-MailFrom: daniel.huigens@proton.ch
X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-cfrg.irtf.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header
CC: IETF SAAG <saag@ietf.org>, IRTF CFRG <cfrg@irtf.org>
X-Mailman-Version: 3.3.9rc4
Precedence: list
Subject: [CFRG] Re: Prehashing in EdDSA vs ML-DSA
List-Id: Crypto Forum Research Group <cfrg.irtf.org>
Archived-At: <https://mailarchive.ietf.org/arch/msg/cfrg/rgntMjDfTLzmgrwu1yciEMhU1dA>
List-Archive: <https://mailarchive.ietf.org/arch/browse/cfrg>
List-Help: <mailto:cfrg-request@irtf.org?subject=help>
List-Owner: <mailto:cfrg-owner@irtf.org>
List-Post: <mailto:cfrg@irtf.org>
List-Subscribe: <mailto:cfrg-join@irtf.org>
List-Unsubscribe: <mailto:cfrg-leave@irtf.org>

On Monday, September 2nd, 2024 at 13:37, Daniel Huigens wrote:

> Most implementations of HashEdDSA I've seen either accept a message (as specified), or explicitly mention that a SHA-512 hash digest should be passed. So hopefully most callers do this correctly.

(Sorry, I meant Ed25519ph here specifically. Of course Ed448ph uses a different hash but I haven't seen as many implementations of it. I'd also argue it's (even) less useful since pure Ed448 has a context parameter that you can use to say you're passing a hash as I mentioned.)

v2.46.0 | Report a Bug | By Email | System Status