Implementing a matching rule for binary (ie: 1.3.6.1.4.1.1466.115.121.1.5)

I'm working on using openldap to store certificate requests (ie: PKCS#10 and SPKAC).

I thought I'd use the binary syntax '1.3.6.1.4.1.1466.115.121.1.5' for my custom attribute. However there doesn't seem to be a equality matching rule for that syntax.

I could implement one, but would such a contribution be accepted by the openldap project? I've looked around online, but I can't seem to find an OID for such a matching rule declared anywhere.

Am I barking up the wrong tree? If not I'll whip up a patch.

Cheers,

Stef Walter