[Bug 271003] New: Improve handling of gpg signing subkeys

[Robert Simmons]

https://bugs.kde.org/show_bug.cgi?id=271003

           Summary: Improve handling of gpg signing subkeys
           Product: kmail
           Version: 1.13.5
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: rsimmons0 at gmail.com


Version:           1.13.5 (using KDE 4.6.2) 
OS:                Linux

KMail should have the capability of using signing subkeys in a complete way.

Reproducible: Always

Steps to Reproduce:
If someone has a primary key that is used for signing and one or more subkeys
also used for signing then KMail encounters gpg's default behavior in that when
you select the key to use to sign, KMail/gpg automatically uses the last
signing subkey rather than the primary (which is what it looks like it is doing
when you choose what key to use).

Actual Results:  
Your message is signed with your signing subkey rather than the primary signing
key as you asked it to do.

Expected Results:  
Sign the message with the primary key.

OS: Linux (i686) release 2.6.35-28-generic
Compiler: cc
Kubuntu 10.10
GnuPG 1.4.10
GnuPG 2.0.14
libcrypt 1.4.5

Ideally there should be an option in emailidentities called
force-exact-keyid=yes
And there should be a corresponding checkbox in the GUI settings page
somewhere.

What this would do is append a ! to the end of the key fingerprint supplied in
PGP Signing Key=

This would force gpg to use the exact primary or subkey fingerprint supplied.

Additionally the GUI interface would need to be changed in one additional way
so that there are no gotchas: it would need to check the keyring for all
possible valid signing key and subkeys and present this list to the user when
they change the default signing key.  At the moment all KMail presents the user
with is a list of primary keys.

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