logos-blockchain-pocs/circom_circuits/hash_bn/poseidon2_hash.circom

//
pragma circom 2.1.9;

include "poseidon2_sponge.circom";

//------------------------------------------------------------------------------
// Hash `n` field elements into 1, with approximately 254 bits of preimage security (?)
// (assuming bn128 scalar field. We use capacity=2, rate=1, t=3).

template Poseidon2_hash(n) {
  signal input  inp[n];
  signal output out;

  component sponge = PoseidonSponge(3,2,n,1);
  sponge.inp    <== inp;
  sponge.out[0] ==> out;
}

//------------------------------------------------------------------------------