WARNING: This is just a PoC. Use at your own risk.
This is a simple python implementation of the OPRF, VOPRF and POPRF Mode of RFC 9497 with ciphersuite OPRF(ristretto255, SHA-512). There seems to be a bug in POPRF mode of the RFC (see here). This has been taken into account
It uses pysodium for all Ristretto255 functions. Therefore it requires a pre-installed libsodium from:
https://github.com/jedisct1/libsodium
tbd