[BUG/Gpgme] checking message with a revoked key

[Albrecht Dreß]

Hi,

I ran into an odd behaviour of gpgme when checking a message which has  
been signed with a revoked key (actually this result comes from a message  
sent to this list recently, Message-ID: <Pine. 
BSD.4.58L0.0405181614250.56703 at erfrnepu.fhfcvpvbhf.bet>). The results part  
of the gpgme (version 0.4.7, gpg 1.2.4) debug log looks like

~~~snip here~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
posix-io.c:374: select OK [ r33 ]
posix-io.c:71: fd 33: about to read 1024 bytes
posix-io.c:78: fd 33: got 66 bytes
fd 33: got `[GNUPG:] SIG_ID hFXuvoA9V980KHYIpmzdzXhcbM4 2004-05-18  
1084912207
'
posix-io.c:328: gpgme:select on [ r33 r37 ]
posix-io.c:374: select OK [ r33 ]
posix-io.c:71: fd 33: about to read 1024 bytes
posix-io.c:78: fd 33: got 71 bytes
fd 33: got `[GNUPG:] REVKEYSIG 9C280BBF3D7D41E3 Atom Smasher  
<atom at suspicious.org>
'
posix-io.c:328: gpgme:select on [ r33 r37 ]
posix-io.c:374: select OK [ r33 ]
posix-io.c:71: fd 33: about to read 1024 bytes
posix-io.c:78: fd 33: got 136 bytes
fd 33: got `[GNUPG:] VALIDSIG 3EBE281030AE601D54B24A909C280BBF3D7D41E3  
2004-05-18 1084912207 0 4 0 17 2 01  
3EBE281030AE601D54B24A909C280BBF3D7D41E3
'
posix-io.c:134: closing fd 33
wait.c:159: setting fd 33 (item=0x10d7fe08) done
posix-io.c:134: closing fd 37
wait.c:159: setting fd 37 (item=0x10d7ff50) done
~~~snip here~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From this, gpgme returns 0x7000096 == source gpgme, error "invalid crypto  
engine". This is grossly misleading, the result should be something like  
"key revoked" (like key expired, see GPG_ERR_KEY_EXPIRED; IMHO such an  
error should be added to gpg-error).

Furthermore, it would be great if I could still get the output stream  
(input was '2440 encoded) from gpgme to display the human-readable message  
content alongside with the more meaningful error message.

Any ideas?

Cheers, Albrecht.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Albrecht Dreß  -  Johanna-Kirchner-Straße 13  -  D-53123 Bonn (Germany)
       Phone (+49) 228 6199571  -  mailto:albrecht.dress at arcor.de
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