Eric Norman <ejnorman(_at_)doit(_dot_)wisc(_dot_)edu> writes:
It's an OID that's used by Outlook Express to include the senders preferred
encryption key among the bunch of certificates that are sent in a PKCS7
signedData structure. The OID is 1.3.6.1.4.1.311.16.4 (seems to be in
Microsoft's arc). It is used as an authenticated attribute; the idea seems to
be the same as SMIMEEncryptionKeyPreference (OID = 1.2.840.113549.1.9.16.2.11).
The syntax is sligtly different; it "points to" the actual certificate with
only IssuerAndSerialNumber; i.e. no CHOICE; no IMPLICIT tag.
It looks like you're using an old version of dumpasn1, this is already present
in the config:
-- Snip --
# This is just the normal issuerAndSerialNumber but with a MS-specific OID.
# Apparently it's used for CryptEncode/DecodeObject, whatever that is.
OID = 06 0A 2B 06 01 04 01 82 37 10 04
Comment = Microsoft attribute
Description = microsoftRecipientInfo (1 3 6 1 4 1 311 16 4)
-- Snip --
There's an OID that seems like it should appear in
http://www.imc.org/ietf-smime/other-smime-oids.asn
I think that's reserved specifically for S/MIME-related OIDs, not for any
random OID which a vendor might choose to invent.
Peter.