@taceo/poseidon2

Poseidon2 permutation for the BN254 scalar field, with parity to the Rust taceo-poseidon2 crate.

Based on Poseidon2 (eprint.iacr.org/2023/323). Parameters are compatible with the HorizenLabs parameter script.

Installation

pnpm add @taceo/poseidon2

Usage

import { bn254 } from '@taceo/poseidon2';

// State sizes t=2, t=3, t=4, t=8, t=12, t=16
const state = [0n, 1n, 2n, 3n];
const out = bn254.t4.permutation(state); // returns new array
bn254.t4.permutationInPlace(state); // mutates in place

Field elements are BN254 scalar field elements (bigint in the range [0, p)), we use @noble/curves’s bn254_Fr internally.

API

• bn254.t2 … bn254.t16 — permutation for state size 2, 3, 4, 8, 12, 16
  • permutation(state: readonly bigint[]): bigint[] — returns new state
  • permutationInPlace(state: bigint[]): void — mutates state

License

MIT or Apache 2.0