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From: Milan Zamazal <pdm@brailcom.org>
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Subject: Re: x-pkcs7-mime verification?
Date: Thu, 31 Mar 2005 22:46:04 +0200
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>>>>> "AJ" == Arne Jørgensen <arne@arnested.dk> writes:

    AJ> What is the difference/why isn't it decsrypting?

It's a clear text message encoded in base64, not a message encrypted
with the recipient's key.

    AJ> I can find the message in the source code but I never see the
    AJ> message myself. When I read a message that is both encrypted and
    AJ> signed I'm asked the same question as you (whether the message
    AJ> should be decrypted or not). On a positive answer I see the
    AJ> decrypted message and if I verify it (`W s') it succeeds too.

And do the headers contain the application/x-pkcs7-mime MIME type?

The mail I have problems with is produced by Outlook and contains the
following content-type headers in the main mail headers:

  Content-Type: application/x-pkcs7-mime; name="smime.p7m"
  Content-Transfer-Encoding: base64
  Content-Disposition: attachment; filename="smime.p7m"

The mail body is base64 encoded and contains a signed message in the
PKCS7 (I assume) format.  The Gnus function handling it is:

  (defun mm-possibly-verify-or-decrypt (parts ctl)
    (let ((type (car ctl))
          (subtype (cadr (split-string (car ctl) "/")))
          (mm-security-handle ctl) ;; (car CTL) is the type.
          protocol func functest)
      (cond
       ((or (equal type "application/x-pkcs7-mime")
            (equal type "application/pkcs7-mime"))
        (with-temp-buffer
          (when (and (cond
                      ((eq mm-decrypt-option 'never) nil)
                      ((eq mm-decrypt-option 'always) t)
                      ((eq mm-decrypt-option 'known) t)
                      (t (y-or-n-p
                          (format "Decrypt (S/MIME) part? "))))
                     (mm-view-pkcs7 parts))
           ...

mm-view-pkcs7 leads to the "unimplemented" message I've seen.

Regards,

Milan Zamazal

-- 
The seeker after truth should be humbler than the dust.  The world crushes the
dust under its feet, but the seeker after truth should so humble himself that
even the dust could crush him.                                 -- M. K. Gandhi