Bellare and Hoang's UtC and HtE[UtC] transforms using ChaCha20-Poly1305 and BLAKE2b.
I will implement CX separately as I find it unlikely to be used with ChaCha20-Poly1305. The other difference is that this implementation produces a 256-bit commitment rather than 128 bits. Thus, it's actually more similar to the Albertini et al. CommitKey.