[Bug 188931] New: kmail fails to verify signature with RFC 3156 encrypted+signed mails

[Raimar Sandner]

https://bugs.kde.org/show_bug.cgi?id=188931

           Summary: kmail fails to verify signature with RFC 3156
                    encrypted+signed mails
           Product: kmail
           Version: unspecified
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: kde-bugs at 404not-found.de


Version:            (using KDE 4.2.1)
Compiler:          gcc-4.3.3 
OS:                Linux
Installed from:    Gentoo Packages

According to http://www.ietf.org/rfc/rfc3156.txt there are two ways to both
sign and encrypt an OpenPGP/MIME message. Kmail uses the method described in
6.1 of RFC 3156 (called RFC 1847 Encapsulation), other mail clients like
thunderbird/enigmail or mutt use 6.2 (Combined method).

Kmail fails to verify the signature, if the message was composed with the
combined method 6.2. The error message is

Message was signed with unknown key.
The validity of the signature cannot be verified.
Status: Error: Signature not verified

On the other hand, verification on the commandline with gpg --verify works.

To reproduce, compose an encrypted and signed message with thunderbird (I use
enigmail 0.95.7) or mutt (1.5.19) and view it with kmail.

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