gmime and S/MIME
David Bremner
david at tethera.net
Thu Jan 29 04:42:35 PST 2015
With a few others, I've been attempting to get S/MIME supported in
notmuch (which as you might or might not remember is using gmime
underneath). The signature verification part is working OK, but I've
gotten a bit bogged down trying to get decryption working.
What I have learned is that according RFC5751, smime message (parts)
look like
Media type: application/pkcs7-mime
parameters: any
file suffix: any
Media type: multipart/signed
parameters: protocol="application/pkcs7-signature"
file suffix: any
Media type: application/octet-stream
parameters: any
file suffix: p7m, p7s, p7c, p7z
Unless I miss something, out of the box there is only support for
decrypting multipart/encrypted. In particular the gmime tests for
S/MIME use this "container format" [1].
So I'm wondering if I'm confused about the RFC(s), or about GMIME, or is
one suppose to write analogs of g_mime_multipart_encrypted_decrypt for
other top level parts?
Cheers,
David
[1]: https://github.com/GNOME/gmime/blob/master/tests/test-smime.c
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