IETF Logo Mail Archive

Re: [openpgp] whitespace definitions in OpenPGP

Daniel Kahn Gillmor <dkg@fifthhorseman.net> Wed, 17 February 2021 13:19 UTC

Return-Path: <dkg@fifthhorseman.net>
X-Original-To: openpgp@ietfa.amsl.com
Delivered-To: openpgp@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BC1603A1A06 for <openpgp@ietfa.amsl.com>; Wed, 17 Feb 2021 05:19:01 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.306
X-Spam-Level:
X-Spam-Status: No, score=-1.306 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, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=neutral reason="invalid (unsupported algorithm ed25519-sha256)" header.d=fifthhorseman.net header.b=zswtLvqI; dkim=pass (2048-bit key) header.d=fifthhorseman.net header.b=lS8gyj23
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 t4zmb8KjVTO1 for <openpgp@ietfa.amsl.com>; Wed, 17 Feb 2021 05:18:59 -0800 (PST)
Received: from che.mayfirst.org (unknown [162.247.75.117]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id ACA003A1A03 for <openpgp@ietf.org>; Wed, 17 Feb 2021 05:18:59 -0800 (PST)
DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/simple; d=fifthhorseman.net; i=@fifthhorseman.net; q=dns/txt; s=2019; t=1613567938; h=from : to : subject : in-reply-to : references : date : message-id : mime-version : content-type : from; bh=2eZReYZfZgL57GQK3yjA9CJYfkHjr4wCrTKSkG63m/c=; b=zswtLvqIg63G/2I5rNH0tYNbG+XXXQysJ2+Jgn2yTYITtafwYhLMd9LyXOkJbI+2j7RgX oFPvjzBaio2KFKDBA==
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=fifthhorseman.net; i=@fifthhorseman.net; q=dns/txt; s=2019rsa; t=1613567938; h=from : to : subject : in-reply-to : references : date : message-id : mime-version : content-type : from; bh=2eZReYZfZgL57GQK3yjA9CJYfkHjr4wCrTKSkG63m/c=; b=lS8gyj23W8Yi765xk554Xq4o7hdixV4AYZC1Jml9gkrw7pcY8kByaNlz8C7iP78i1NKB9 Kp2pMwBXQM0PL/YdpCU6FogPNFj3ht92x1m+nJy09BgaULW0eUUJ9SrJ+nCeTLSixWuXVaa X94g+AtX4SdL53iZXHxeE+5GJSelbniu/3Ao6ou3ahefKqh5cFojFP/Zqo24gFa84Zg22hM AnMn/I+3+zhFweJofMkMj2s9rN5GLoM+M1/bMPNeZP8eukIgGvlxxbgGSvYefhwEGlgE5eu reiQI/o9+bKvdeDW76Adm70IzkmGCfK6xXuQj9nH9piENwp1l/+HoKucOiMA==
Received: from fifthhorseman.net (lair.fifthhorseman.net [108.58.6.98]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by che.mayfirst.org (Postfix) with ESMTPSA id 720ACF9A7; Wed, 17 Feb 2021 08:18:57 -0500 (EST)
Received: by fifthhorseman.net (Postfix, from userid 1000) id 5704520458; Tue, 16 Feb 2021 18:52:49 -0500 (EST)
From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
To: vedaal@nym.hush.com, openpgp@ietf.org
In-Reply-To: <20210216192920.0D38B827BB0@smtp.hushmail.com>
References: <161254580617.29620.7114088127291075805@ietfa.amsl.com> <76fe41fc-f14e-fe3c-db02-7e5b7629dc8a@gmx.net> <1612693541055.92697@cs.auckland.ac.nz> <fe95a37d-7853-fa7b-f8ce-49b60928206b@andrewg.com> <YCVSa3CWuRIV17ry@thunder.hadrons.org> <87blckvqa5.fsf@fifthhorseman.net> <87h7mcl6mx.fsf@wheatstone.g10code.de> <871rdguej2.fsf@fifthhorseman.net> <20210216192920.0D38B827BB0@smtp.hushmail.com>
Autocrypt: addr=dkg@fifthhorseman.net; prefer-encrypt=mutual; keydata= mDMEX+i03xYJKwYBBAHaRw8BAQdACA4xvL/xI5dHedcnkfViyq84doe8zFRid9jW7CC9XBiI0QQf FgoAgwWCX+i03wWJBZ+mAAMLCQcJEOCS6zpcoQ26RxQAAAAAAB4AIHNhbHRAbm90YXRpb25zLnNl cXVvaWEtcGdwLm9yZ/tr8E9NA10HvcAVlSxnox6z62KXCInWjZaiBIlgX6O5AxUKCAKbAQIeARYh BMKfigwB81402BaqXOCS6zpcoQ26AADZHQD/Zx9nc3N2kj13AUsKMr/7zekBtgfSIGB3hRCU74Su G44A/34Yp6IAkndewLxb1WdRSokycnaCVyrk0nb4imeAYyoPtBc8ZGtnQGZpZnRoaG9yc2VtYW4u bmV0PojRBBMWCgCDBYJf6LTfBYkFn6YAAwsJBwkQ4JLrOlyhDbpHFAAAAAAAHgAgc2FsdEBub3Rh dGlvbnMuc2VxdW9pYS1wZ3Aub3JnL0Gwxvypz2tu1IPG+yu1zPjkiZwpscsitwrVvzN3bbADFQoI ApsBAh4BFiEEwp+KDAHzXjTYFqpc4JLrOlyhDboAAPkXAP0Z29z7jW+YzLzPTQML4EQLMbkHOfU4 +s+ki81Czt0WqgD/SJ8RyrqDCtEP8+E4ZSR01ysKqh+MUAsTaJlzZjehiQ24MwRf6LTfFgkrBgEE AdpHDwEBB0DkKHOW2kmqfAK461+acQ49gc2Z6VoXMChRqobGP0ubb4kBiAQYFgoBOgWCX+i03wWJ BZ+mAAkQ4JLrOlyhDbpHFAAAAAAAHgAgc2FsdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3Jnfvo+ nHoxDwaLaJD8XZuXiaqBNZtIGXIypF1udBBRoc0CmwICHgG+oAQZFgoAbwWCX+i03wkQPp1xc3He VlxHFAAAAAAAHgAgc2FsdEBub3RhdGlvbnMuc2VxdW9pYS1wZ3Aub3JnaheiqE7Pfi3Atb3GGTw+ jFcBGOaobgzEJrhEuFpXREEWIQQttUkcnfDcj0MoY88+nXFzcd5WXAAAvrsBAIJ5sBg8Udocv25N stN/zWOiYpnjjvOjVMLH4fV3pWE1AP9T6hzHz7hRnAA8d01vqoxOlQ3O6cb/kFYAjqx3oMXSBhYh BMKfigwB81402BaqXOCS6zpcoQ26AADX7gD/b83VObe14xrNP8xcltRrBZF5OE1rQSPkMNy+eWpk eCwA/1hxiS8ZxL5/elNjXiWuHXEvUGnRoVj745Vl48sZPVYMuDgEX+i03xIKKwYBBAGXVQEFAQEH QIGex1WZbH6xhUBve5mblScGYU+Y8QJOomXH+rr5tMsMAwEICYjJBBgWCgB7BYJf6LTfBYkFn6YA CRDgkus6XKENukcUAAAAAAAeACBzYWx0QG5vdGF0aW9ucy5zZXF1b2lhLXBncC5vcmcEAx9vTD3b J0SXkhvcRcCr6uIDJwic3KFKxkH1m4QW0QKbDAIeARYhBMKfigwB81402BaqXOCS6zpcoQ26AAAX mwD8CWmukxwskU82RZLMk5fm1wCgMB5z8dA50KLw3rgsCykBAKg1w/Y7XpBS3SlXEegIg1K1e6dR fRxL7Z37WZXoH8AH
Date: Tue, 16 Feb 2021 18:52:48 -0500
Message-ID: <87v9artvsf.fsf@fifthhorseman.net>
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-="; micalg="pgp-sha256"; protocol="application/pgp-signature"
Archived-At: <https://mailarchive.ietf.org/arch/msg/openpgp/Yt92jadluKiQUF1clG77OZe_PD8>
Subject: Re: [openpgp] whitespace definitions in OpenPGP
X-BeenThere: openpgp@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Ongoing discussion of OpenPGP issues." <openpgp.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/openpgp>, <mailto:openpgp-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/openpgp/>
List-Post: <mailto:openpgp@ietf.org>
List-Help: <mailto:openpgp-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/openpgp>, <mailto:openpgp-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 17 Feb 2021 13:19:02 -0000

Hi vedaal--

On Tue 2021-02-16 14:29:19 -0500, vedaal@nym.hush.com wrote:
> On 2/16/2021 at 12:08 PM, "Daniel Kahn Gillmor"  wrote:
> Proposals for additional cases to test would also be useful.
>
> =====
> PDF renders an empty line as whitespace, even if there is a line
> return.
>
> This functionally means that the empty line after the PGP header and
> the Cyphertext
> will be interpreted as being omitted, even if copied from the PDF.

I don't know what PDF you're talking about.  Are you referring to a
specific example PDF?  to a (common?) form of translation between ASCII
text streams and PDFs?  to something else?

> If it is possible, I would suggest that both cases be accepted, 
> i.e.  with a LR/empty line after the header and the cyphertext,
> and if no such empty line exists.

The goal of the whitespace canonicalization as i understand it is
*exactly* this -- that regardless of how the unprintable characters show
up (or don't), a valid signature will be seen as valid.

However, the thing that is validated is the canonicalized version, not
any of the potential whitespace variants.

      --dkg

v2.23.0 | Report a Bug | By Email