[issue132] gpgme_op_keylist_ext_start (CMS) fails to return any key if one of the patterns given is an OpenPGP fingerprint

New submission from Marc Mutz <[email protected]>:

The equivalent gpgsm command line works, though: 
 
$ gpgsm --list-secret-keys <S/MIME-KEY fingerprint> <OpenPGP-key fingerprint> 
<lists the S/MIME key only, doesn't return an error> 
 
compare this to 
 
$./test_gpgme_secret_keylisting <S/MIME-key fingerprint> <OpenPGP-key fpr> 
<lists nothing> 
$./test_gpgme_secret_keylisting <S/MIME-key fingerprint> (only that) 
<lists S/MIME key> 
 
The same thing on a context set to GPGME_PROTOCOL_OpenPGP works (ie. returns 
the OpenPGP key, ignores the S/MIME fingerprint). This is the expected result. 
Anything else makes op_keylist useless for looking up keys by person or email. 
 
Test app (code from info gpgme, adjusted to use _ext_, CMS, and argv, as well 
as to make it compile :P) attached.

----------
assignedto: werner
files: test_gpgme_secret_keylisting.c
messages: 608
nosy: marc, werner
priority: urgent
status: unread
title: gpgme_op_keylist_ext_start (CMS) fails to return any key if one of the patterns given is an OpenPGP fingerprint
topic: GPGME
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Aegypten issue tracker <[email protected]>
<https://intevation.de/roundup/aegypten/issue132>
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#include <gpgme.h>
#include <stdio.h>
#include <string.h>

int main( int argc, char ** argv ) {
     gpgme_ctx_t ctx;
     gpgme_key_t key;
     gpgme_error_t err = gpgme_new (&ctx);

     if ( err )
       return 1;

     err = gpgme_set_protocol( ctx, GPGME_PROTOCOL_CMS );

     if ( err )
       return 2;

     if ( argc < 2 )
       return 3;

     char ** what = (char**)malloc( argc * sizeof( char * ) );
     memset( what, 0, argc * sizeof( char * ) );
     memcpy( what, argv + 1, (argc - 1) * sizeof( char * ) );

     if (!err)
       {
         err = gpgme_op_keylist_ext_start (ctx, (const char**)what, 1, 0);
         while (!err)
           {
             err = gpgme_op_keylist_next (ctx, &key);
             if (err)
               break;
             printf ("%s: %s <%s>\n", key->subkeys->fpr, key->uids->name, key->uids->email);
             gpgme_key_release (key);
           }
         gpgme_release (ctx);
       }
     if (gpg_err_code (err) != GPG_ERR_EOF)
       {
         fprintf (stderr, "%s: can not list keys: %s\n",
                  argv[0], gpgme_strerror (err));
         exit (1);
       }

     return 0;
}