gnupg 1.0.4 <-> 1.0.0 interoperability problem

[Peter Bloecher (EED)]

Hello,

After upgrading to gpg 1.0.4 I discovered a problem when exchanging messages
with people using gpg 1.0.0. What happens is that during decryption they are asked
to enter their private key, but then no decrypted output is produced. No message
is printed, either -- just nothing happens. gpg 1.0.4 can decrypt the message without
problem. [this is all happening on SunOS 5.6 = Solaris 2.6]

Calling gpg 1.0.0 with --list-packets results in

:pubkey enc packet: version 3, algo 16, keyid 274336D3E7F40A9D
        data: [1022 bits]
        data: [1022 bits]
:unknown packet: type 18, length 0
dump: 01 e2 83 8e 36 0d 30 d7  2f cb 17 29 48 b1 9d b3  99 02 57 b4 90 51 73 48
  24: 38 f6 32 c7 de 14 3d ee  e8 ee 46 90 5a da 91 4a  6d 59 d1 71 15 03 35 07
(dunp continues)

Calling gpg 1.0.4 with --list-packets gives

:pubkey enc packet: version 3, algo 16, keyid 274336D3E7F40A9D
        data: [1022 bits]
        data: [1022 bits]
:encrypted data packet:
        length: 4294967295
        mdc_method: 2
:compressed packet: algo=2
:literal data packet:
        mode b, created 976709893, name="testtext",
        raw data: 1420 bytes

The length field of the encrypted packet looks suspicious, but that does not
have to be connected to the problem.

I am able to reproduce the problem with test data and a test key. They are available
on request.

Just upgrading everybody to 1.0.4 does not seem reasonable. I also fear that
there might be interoperability problems with, e.g., PGP.

Any advice?

Best regards,

/Peter

PS: Please CC me on any answer - I'm not subscribed to the list

-- 

Peter Bloecher, Ericsson Research
Speech & Signal Processing
Ericsson Eurolab Deutschland GmbH  Tel: +49 911 5217-307
Nordostpark 12                     Fax: +49 911 5217-961
D-90411 Nuernberg                  mailto:Peter.Bloecher@eed.ericsson.se

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