pgpy.errors.PGPError: 109 is not a valid ECPointFormat

[vollkorn1982]

I am learning how to use PGPy and for that purpose I wrote a small program to import all public keys from my keyring.

import pgpy

pgpy.PGPKeyring('./mypubkeys.asc')

This fails with the following error message:

pgpy.errors.PGPError: 109 is not a valid ECPointFormat

Importing single test keys works fine.

I assume this is a problem with a specific key. Is there an easy way to find out which key would cause this?

Full stack trace:

Traceback (most recent call last):
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/types.py", line 556, in __call__
    obj.parse(packet)
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/packet/packets.py", line 854, in parse
    self.keymaterial.parse(packet[:pend])
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/packet/fields.py", line 639, in parse
    self.p = ECPoint(packet)
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/packet/fields.py", line 488, in __init__
    self.format = ECPointFormat(xy[0])
  File "/usr/lib/python3.6/enum.py", line 293, in __call__
    return cls.__new__(cls, value)
  File "/usr/lib/python3.6/enum.py", line 535, in __new__
    return cls._missing_(value)
  File "/usr/lib/python3.6/enum.py", line 548, in _missing_
    raise ValueError("%r is not a valid %s" % (value, cls.__name__))
ValueError: 109 is not a valid ECPointFormat

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "./minimal_test.py", line 5, in <module>
    pgpy.PGPKeyring('./mypubkeys.asc')
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/pgp.py", line 2406, in __init__
    self.load(*args)
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/pgp.py", line 2525, in load
    _key, keys = PGPKey.from_file(key)
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/types.py", line 189, in from_file
    po = obj.parse(data)
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/pgp.py", line 2363, in parse
    [ operator.ior(pgpobj, PGPSignature() | sig) for sig in group if not isinstance(sig, Opaque) ]
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/pgp.py", line 2363, in <listcomp>
    [ operator.ior(pgpobj, PGPSignature() | sig) for sig in group if not isinstance(sig, Opaque) ]
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/pgp.py", line 2333, in <lambda>
    _getpkt = lambda d: (Packet(d) if d else None)  # flake8: noqa
  File "/home/jan/Projekte/pgpy/venv/lib/python3.6/site-packages/pgpy/types.py", line 559, in __call__
    six.raise_from(PGPError(str(ex)), ex)
  File "<string>", line 3, in raise_from
pgpy.errors.PGPError: 109 is not a valid ECPointFormat

[vollkorn1982]

I wrote a little script to export all public keys of my keyring separately from gnupg and import them one by one with pgpy. I found the key which gave me the above error and it has an Elgamal and a DSA subkey, as can be seen with gnupg:

[...]
sub   rsa2048 2009-09-01 [S]
sub   rsa2048 2009-09-01 [E]
sub   rsa2048 2009-09-01 [A]
sub   elg4096 2009-09-01 [E]
sub   dsa3072 2009-09-01 [S]
sub   ed25519 2014-04-06 [S]

So I guess the problem I am having is, that this error message is not very helpful. I would like, if possible, get the following information:

• During the import of which key did this happen? ("While importing key 0xabbababa the following error occurred")
• What could be the likely cause? ("This looks like an unsupported key format")

Unfortunately, I do not understand the pgp key format or import code sufficiently enough to create such a pull request or determine if this is even possible.

[vollkorn1982]

I had a closer look at the offending key. It is the ed25519 key, which causes the above error. The packet looks like this:

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And the above exception throws at the following part in the beginning:

bytearray(b'm\x18\xb1*\xb01\xae\xc9$\x7f\xae@\xa7\x1c5\xe0\xac\x11j\xe4\xd1Po#\xd7\x19T\xc8x\xbfh\xc6')

According to https://tools.ietf.org/html/draft-ietf-openpgp-rfc4880bis-07#section-5.10 'm' or 109 denotes a MIME packet. I'm not sure why that would start within another packet, but that's so far the best lead I have. Also there's some URLs later in the packet.

The problematic key can be found on the keyservers, for example at: https://ha.pool.sks-keyservers.net/pks/lookup?op=get&search=0xA9C86C8DD3AE8D3A

Is this a malformed key? Why does gnupg import this key without a hitch then? What would we need to change in PGPy to use this key?