[multipathtcp] Replacing SHA-1 with SHA-256

Alan Ford <alan.ford@gmail.com> Mon, 13 March 2017 20:44 UTC

Return-Path: <alan.ford@gmail.com>
X-Original-To: multipathtcp@ietfa.amsl.com
Delivered-To: multipathtcp@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D948F129B1F for <multipathtcp@ietfa.amsl.com>; Mon, 13 Mar 2017 13:44:09 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2
X-Spam-Level:
X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dX2KVG0CuxHa for <multipathtcp@ietfa.amsl.com>; Mon, 13 Mar 2017 13:44:08 -0700 (PDT)
Received: from mail-wr0-x234.google.com (mail-wr0-x234.google.com [IPv6:2a00:1450:400c:c0c::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5C48A1294A5 for <multipathtcp@ietf.org>; Mon, 13 Mar 2017 13:44:08 -0700 (PDT)
Received: by mail-wr0-x234.google.com with SMTP id u48so111703702wrc.0 for <multipathtcp@ietf.org>; Mon, 13 Mar 2017 13:44:08 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:content-transfer-encoding:subject:message-id:date:to :mime-version; bh=qs/kXkO5Vrh4vbPa9ixgKhMs3QYglwX5Oc+DkFAhRvQ=; b=LuD9Q8RAYa73rv2rhW5PBtsr/mEnYRZiophC9L4x83AdCSCKlXTkNmkCG2b2nhkbUy dApPXGLy8mDftYwna7zD1PHRuA+jRjDPIwpEdqM3RhcDRfTEzwoCg5s75o9gwRtSO6ab 6dmJhwckEv8eEca83yuSly/Fu4mXq0+tNcanp7FXZMygUv0TqbTLZLdzw++Qf0fKUw5Z NqtzmiVTeIuxT2l0hAAIrBPXJc8Y+phTuwe4aSaFxXjCyY1XRTc5idWjO4A6ofMc1egR YXHWxjhZX+YkDqXuJ1luXoV3BEBNiKy2zd2rjenwYaIRIGHryccwX2epaDgosR5cZfpo aJKQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:content-transfer-encoding:subject :message-id:date:to:mime-version; bh=qs/kXkO5Vrh4vbPa9ixgKhMs3QYglwX5Oc+DkFAhRvQ=; b=C/vrbvhS/2dO+0UvEnuKmVa6IZ6sGUF4OvNNQBuT/xbuWQYKjH7EqZ2TfFoqt0F2sC J+x+YHISiV1iW2jBoYrf2HpEMmfi4PlOUg6RuXj7L5z50+qSNrvecc11RvDiBPCI0+iE w1vFOTuGVhXJ8D2Q32zFycRzQvePEAJhFm98ai5abY9lF6DuEn/q7rnyQaZPC3G9rryq yEqF73fHYq91nqe++qDX2wtRay3kVbUiKxeOMODvJmg3jJGzUagXHdr4LbNFIdXteDV3 pVgWFU6QfReUar7qmqm5re2MyHjxLW2bnGrXpcM4FVNExDw4rlqpZdaq5Bi9WYXldhvc 6OyQ==
X-Gm-Message-State: AMke39nCsFpbTSDPu0S6yJajXlRcfNmGVhNm0ZhA88KQ+TZMRWgNMiRnlAU54ivXWtyHlg==
X-Received: by 10.223.143.68 with SMTP id p62mr28472315wrb.2.1489437846711; Mon, 13 Mar 2017 13:44:06 -0700 (PDT)
Received: from alans-mbp.lan (152.52.159.143.dyn.plus.net. [143.159.52.152]) by smtp.gmail.com with ESMTPSA id 61sm26369375wrs.29.2017.03.13.13.44.05 for <multipathtcp@ietf.org> (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 13 Mar 2017 13:44:06 -0700 (PDT)
From: Alan Ford <alan.ford@gmail.com>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Message-Id: <5254457A-9922-4E02-8A60-18E712A3EE5D@gmail.com>
Date: Mon, 13 Mar 2017 20:44:05 +0000
To: multipathtcp@ietf.org
Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\))
X-Mailer: Apple Mail (2.3124)
Archived-At: <https://mailarchive.ietf.org/arch/msg/multipathtcp/fG25HF8GdsLYvlnuLQKJreTZWU0>
Subject: [multipathtcp] Replacing SHA-1 with SHA-256
X-BeenThere: multipathtcp@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: Multi-path extensions for TCP <multipathtcp.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/multipathtcp>, <mailto:multipathtcp-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/multipathtcp/>
List-Post: <mailto:multipathtcp@ietf.org>
List-Help: <mailto:multipathtcp-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/multipathtcp>, <mailto:multipathtcp-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 13 Mar 2017 20:44:10 -0000

Hi all,

It’s been flagged up off-list that given SHA-1 is being deprecated, we should probably look to replace it with SHA-256 in 6824bis. Even though we use truncations of these hashes, the benefits gained from SHA-256 are maybe not significant, but does mean that legacy SHA-1 code would not be required by implementors.

Does anyone have any concerns about such a change? We do not believe it would be significant and could be a direct drop-in in the places where SHA-1 is referenced and used today.

Regards,
Alan