Re: decrypting S/MIME messages

[Simon Josefsson <jas@extundo.com>]

Vladimir Volovich <vvv@vsu.ru> writes:

> The question is: how should i view encrypted s/mime messages? why
> there are no calls to smime-decrypt-buffer done by gnus automatically?
> 
> Is it just not-yet-implemented, but all framework is there already?

You're right, the framework is there but the glue is missing.

There was a minor problem adding the glue, application/pkcs7-mime is a
catch-all MIME tag and it can be almost any PKCS#7 blob.  To find out
what kind of operation should be performed (decryption, verification,
or simple unwrapping) one need to look inside the PKCS#7 blob.  I
wrote a ASN.1 parser in elisp and had everything almost working some
moons ago, but lost it in a harddisk crash.  The ASN.1 parser isn't
really necessary, a carefully constructed `looking-at' invocation is
sufficient, and unless I get very bored I won't write another ASN.1
parser so the `looking-at' approach is probably the way to go.  I've
almost finished this, and I'll try to get some time to commit it this
tomorrow.