Availability of OPRF?

[matthiasgeihs]

OPRFs can be useful primitives in privacy-preserving protocols.

Does this library contain any OPRF implementations? If not, are there plans to include some in the future?

In particular, I'm looking for a verifiable threshold OPRF with committed inputs that can be composed with other primitives. For example, I'd like to be able to prove that for a given value pid, I posses a credential for a value id (i.e., a signature sig = SIGN(id) from a credential issuer) and that OPRF(id) = pid, without revealing id.