Initial pass at a BNF

[Robert J. Hansen]

Pursuant to a discussion on gnupg-devel, I'm looking for exotic,
esoteric, and just plain broken keys.  I need keys with X.509
certificates, keys with public key data packets, keys with signature
subpackets, and any key that you feel is an aberration against anything
from your chosen deity to the laws of physics to the guidelines of just
good sense.

My goal here is to provide an accurate Backus-Naur Form (BNF, a
programming tool) for people who need to parse GnuPG keyrings.  The more
 crazy keys I get, the more confident all of us can be in the accuracy
of the finished product.

Please send them to me directly.  Let's not spam the list.  Thank you
all very much for your help!