[Bug 289722] New: Incorrect Content-Transfer-Encoding header value is set for pgp/mime encrypted mails

[Stanislav Sidorenko]

https://bugs.kde.org/show_bug.cgi?id=289722

           Summary: Incorrect Content-Transfer-Encoding header value is
                    set for pgp/mime encrypted mails
           Product: kmail2
           Version: 4.7
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: crypto
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: mail at stanislavsidorenko.com


Version:           4.7 (using KDE 4.7.3) 
OS:                Linux

If you try to send encrypted pgp/mime email that contain 8bit characters then
main Content-Transfer-Encoding header will be set to base64, but it shoud
contain 7Bit in this case. 

Here is a part of problematic message:

----------------------------------
MIME-Version: 1.0
Content-Type: multipart/encrypted; boundary="nextPart5141910.e6Y767UtIz";
protocol="application/pgp-encrypted"
Content-Transfer-Encoding: base64 


--nextPart5141910.e6Y767UtIz
Content-Type: application/pgp-encrypted
Content-Disposition: attachment

Version: 1
--nextPart5141910.e6Y767UtIz
Content-Type: application/octet-stream
Content-Disposition: inline; filename="msg.asc"

-----BEGIN PGP MESSAGE-----
Version: GnuPG v1.4.11 (GNU/Linux)

hQEMA5XFb/XflcUEAQf/XJ8D5zLDrTTXaE3MtlW4//pMc6ZH8S1bKMeQqKg8LM0U
8KnzFCoy5smyWZrMFqNmoK7CwVnfDS1AgYamVwDNPJLcYlTTqs1YCEJ2Fv/t6EtA
----------------------------------

As a result other mail client fail to decrypt and verify such mail - they try
to decode base64 stream which is actually absent here.


Reproducible: Always

Steps to Reproduce:
1) Create a new message with some non 7bit characters, e.g. "Тестовое
сообщение".
2) Enable PGP/MIME encryption for message.
3) Put it to queue or send it.

Actual Results:  
Content-Transfer-Encoding: base64 

Expected Results:  
Content-Transfer-Encoding: 7Bit

Note, that only main(external) Content-Transfer-Encoding header should contain
7Bit, some headers are also included into encrypted stream - they are to be
defined depending on actual message data.

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