Yes it does, but specific to nip44 at the moment. And yes links to the secp256k1 library
https://git.vaughnnugent.com/cgit/vnuge/noscrypt.git/tree/include/noscrypt.h#n435

This is a higher-level api that handles the nip44 message structure and MAC
https://git.vaughnnugent.com/cgit/vnuge/noscrypt.git/tree/include/noscryptutil.h