poseidon-rs 
Poseidon hash implementation in Rust, a zkSNARK friendly hash function.
https://eprint.iacr.org/2019/458.pdf
Compatible with the Poseidon implementations:
- Sage (reference implementation): https://extgit.iaik.tugraz.at/krypto/hadeshash
- Go: https://github.com/iden3/go-iden3-crypto
- Js & circom: https://github.com/iden3/circomlib
An arkworks-based version of this repo can be found at https://github.com/arnaucube/poseidon-ark
Warning
Do not use in production