Phillip Hallam-Baker <phill(_at_)hallambaker(_dot_)com> writes:
I have wanted this for a long time. there are actually three separate
problems to be solved.
1) How to make S/MIME work with OpenPGP credentials
2) How to make OpenPGP work with S/MIME credentials
3) How to merge the two specifications into one.
The first two are pretty easy, I've been doing that for years. For S/MIME,
use the subjectKeyIdentifier form of the key ID. For PGP, use an
issuerAndSerialNumber in a type-and-value subpacket.
The third is impossible. While at an abstract level PGP and S/MIME do the
same thing, the bit-bagging formats used to encode the abstraction are
completely incompatible. You can't make them compatible without either moving
S/MIME to the PGP format or PGP to the S/MIME format. I can't see either of
those happening...
Peter.
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