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Re: [openpgp] "OpenPGP Simple"

Peter Gutmann <pgut001@cs.auckland.ac.nz> Sun, 22 March 2015 13:54 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: Sun, 22 Mar 2015 13:54:32 +0000
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Subject: Re: [openpgp] "OpenPGP Simple"
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Derek Atkins <derek@ihtfp.com> writes:

>Have you tried to have them read the CMS/PKIX set of specs??  And they still
>think that 4880 is too complex??

Having implemented both 3369 and 4880 (I'm not going to touch 5280 et al, no-
one has that much asbestos), 3369 is much easier to work with.  The reason for
this is that there's a single overall type (ContentInfo) for everything and
then consistent subtypes (SignedData, EnvelopedData) within that, all
collected together inside type-specific containers.  PGP OTOH is a series of
packets with somewhat arbitrary fields (look at the literal-data packet for
example), all concatenated together in a rather ad hoc order, which means you
have to hand-craft parsing code for almost everything.  When a new type
(AuthEnvelopedData) was added to CMS I just added an OID and a function
pointer to the decoding table and a bit of glue code and I was done.  The PGP
equivalent OTOH, MDC'd data... ugh.

Peter.

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