https://bugs.kde.org/show_bug.cgi?id=286553

Sandro Knauß <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |CONFIRMED
         Resolution|WAITINGFORINFO              |---

--- Comment #23 from Sandro Knauß <[email protected]> ---
Thx for these informations. Now I can reproduce this behaviour and understand,
what's going on.
I can confirm also that the signature is correct by using
gpg --verifiy signature.sig text.txt

This bug can be viewed differently.
Either we can say, this is a bug of enigmail
(extensions/enigmail/package/mimeVerify.jsm line 184):
this.writeToPipe(data.replace(/^-/gm, "- -"));
They modify the signed message, that should never ever be done. Like RFC 3156
says:
"Multipart/signed and multipart/encrypted are to be treated by agents as
opaque, meaning that the data is not to be altered in any way"

The other way we can look atthis bug, is that we ignoring RfC 3156
recommendation:
"It cannot be stressed enough that applications using this standard follow
MIME's suggestion that you 'be conservative in what you generate, and liberal
in what you accept.' "

To solve this bug kmail has to use Quoted-Printiable or Base64 and escape the
signature sequence "--\n", that causes enigmail to change the content of the
signed content.t

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