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Re: [openpgp] "OpenPGP Simple"

Peter Gutmann <pgut001@cs.auckland.ac.nz> Tue, 17 March 2015 02:10 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: "openpgp@ietf.org" <openpgp@ietf.org>
Thread-Topic: [openpgp] "OpenPGP Simple"
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Date: Tue, 17 Mar 2015 02:10:16 +0000
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Subject: Re: [openpgp] "OpenPGP Simple"
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David Shaw <dshaw@jabberwocky.com> writes:
>On Mar 16, 2015, at 5:15 PM, David Leon Gil <coruus@gmail.com> wrote:
>> Partial lengths are really a nuisance to parse.
>
>No argument there...

The whole bizarro sort-of-fixed-point encoding of lengths is a pain (this is a
cue for Jon to do his "every bit is sacred" dance).  If the format is revised,
there should be only two lengths, a 16-bit one for almost everything (keyring
data, signatures, etc), and a 32-bit one for payloads and partial lengths that
are going to exceed 16-bit lengths.  Length-decoding shouldn't be any more
complicated than:

read tag;
if( tag & length_32_flag )
  length = read32();
else
  length = read16();

While I'm venting, shall I get started on the MDC kludge?

Peter.

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