js-rln/src/utils/hash.ts

import * as zerokitRLN from "@waku/zerokit-rln-wasm";

import { concatenate, writeUIntLE } from "./bytes.js";

export function poseidonHash(...input: Array<Uint8Array>): Uint8Array {
  const inputLen = writeUIntLE(new Uint8Array(8), input.length, 0, 8);
  const lenPrefixedData = concatenate(inputLen, ...input);
  return zerokitRLN.poseidonHash(lenPrefixedData);
}

export function sha256(input: Uint8Array): Uint8Array {
  const inputLen = writeUIntLE(new Uint8Array(8), input.length, 0, 8);
  const lenPrefixedData = concatenate(inputLen, input);
  return zerokitRLN.hash(lenPrefixedData);
}