On Fri, 21 Oct 2005 15:03:46 +0200, Joost van Baal said:

> I am having troubles getting S/MIME emails (or CMS blobs) processed by
> GPGME.  (Since GPGME uses libksba, it _should_ be able to handle these,
> I guess).

Yes, it does.

> For instance, when creating a detached-signed S/MIME email message,
> splitting the body off, and de-base64-ing the signature with

>  recode /Base64 < sig.base64 > sig.CMS

I don't know what kind of recode this is.  I usually use mimencode -u,

> , calling gpgsm gives:

>  gpgsm --verify sig.CMS body.txt

>  gpgsm: Signature made 2005-10-21 11:40:54 using certificate ID 090E2BFC
>  gpgsm: invalid signature: message digest attribute does not match calculated 
> one

You did something wrong when parsing the orginal message.  For
example, you need to make sure that CR,LF are used.  Use gpgsm's
option --debug 512 to create dump files with the actual data hashed
(i.e. signed).  Check them.

>  gpgsm: unsupported algorithm `1.2.840.113549.3.2'
>  gpgsm: (this is the RC2 algorithm)
>  gpgsm: message decryption failed: Unsupported algorithm <GpgSM>

Well, unsupported. 

> Unfortunately I can't check this operation with openssl, since I have no
> way to export the private key from the keystore to a .pem-file, suitable
> for import to openssl...

gpgsm --export-secret-key-p12

(you better get the latest gpgsm versions because we fixed a couple of
bugs recently.

> Any pointers or clues are very welcome.  If more information about my
> setup is needed, I gladly supply these.

Check out how Mutt does it.  In particular the file crypt-gpgme.c from
the 1.5.x series or the CVS head.  There is also a tool named
tools/gpgparsemail.c in GnuPG 1.9 - it does S/MIME verification.


Shalom-Salam,

   Werner


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