[Bug 294687] New: S/MIME encrypted and signed e-mails are displayed with a wrong signature in Outlook 2003/2007

[Roland Wolters]

https://bugs.kde.org/show_bug.cgi?id=294687

           Summary: S/MIME encrypted and signed e-mails are displayed with
                    a wrong signature in Outlook 2003/2007
           Product: kmail2
           Version: 4.8
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: crypto
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: wolters.liste at gmx.net


Version:           4.8 (using KDE 4.8.0) 
OS:                Linux

Outlook 2003 or 2007 display the e-mails sent with the new KMail wrong: the
signature is reported as invalid, the text itself shows "=" characters, for
example:

> Die Gleichheitszeichen deuten darauf hin, dass der quoted-printable Inh=lt
> der E-Mail durch den von Ihnen verwendeten E-Mail-Client fehlerhaft 
> dekodiert wird und die fehlerhafte Ausgabe zu Signatur-Problemen führ=.

The problem appeared with the upgrade to KMail 4.7:

The problem did not occure with:

> KMail/1.13.6 (Linux/2.6.38-10-generic; KDE/4.6.5; x86_64; ; )
> MIME-Version: 1.0
> Content-Type: application/pkcs7-mime; smime-type=enveloped-data;
>        name="smime.p7m"
> Content-Transfer-Encoding: base64
> Content-Disposition: attachment; filename="smime.p7m"

But the problem did occure with:

> User-Agent: KMail/4.7.2 (Linux/3.0.0-12-generic; KDE/4.7.2; x86_64; ; )
> MIME-Version: 1.0
> Content-Type: application/pkcs7-mime; name="smime.p7m";
>         smime-type=enveloped-data
> Content-Transfer-Encoding: base64

We CC'ed the same e-mail to another user and decrypted the e-mail with openssl,
etc. There everything looked fine.


Reproducible: Always

Steps to Reproduce:
1. Create a S/MIME signed e-mail with KMmail >= 4.7.2 .
2. Send this e-mail to someone using Outlook 2003 or 2007 .
3. Let it check the signature.

Actual Results:  
The Outlook client reports the signature is broken and shows "=" chars where
non should be shown.

Expected Results:  
The Outlook client should just show the e-mail as correctly signed.

It might very well be that this is an Outlook bug - but I am not fully sure.

Also, the "=" chars do look like this might be an mime part decoding problem.

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