[kleopatra] [Bug 316353] New: kleopatra (and kmail) create empty signatures if the private key is stored on a gnupg smartcard

[Max Resch]

https://bugs.kde.org/show_bug.cgi?id=316353

            Bug ID: 316353
           Summary: kleopatra (and kmail) create empty signatures if the
                    private key is stored on a gnupg smartcard
    Classification: Unclassified
           Product: kleopatra
           Version: 2.1.1
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: resch.max at gmail.com
                CC: mutz at kde.org

kleopatra creates empty detached signature files, although the correct key is
selected in the sign-wizard, and the wizard returns successfully. The private
signing key is stored on a gnupg smartcard.

A look into the gpg-agent log reviles that kleopatra communicates successfully
with gpg-agent (the pin entry and everything works) but in the end the wrong
key for signing is requested (gpg card hold a signing and an authentication key
and the requested key is for some reason the authentication key)

If you use the gpg commandline tool the same happens unless you use the
--local-user switch or a key with an exclamation mark in the end.

Probably for the same reason kmail is not able to create a signature (the
signature part of the email empty)

Reproducible: Always

Steps to Reproduce:
1. Insert the smartcard
2. Select file -> sign
3. Use the wizard, it runs correctly but the detached signature file is empty
(0 Bytes)
Actual Results:  
An empty (0 Byte) file is created instead of the expected gnupg detached
signature file.

Expected Results:  
I expected a detached signature file to be created:
As if I had run
$ gpg -s -d -u "key-id!" file

If this is a gnupg configuration error on my side it would be nice if the
signing process fails.

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