keccak256 wasm

index.js

const fs = require('fs')
const path = require('path')

const memset = (mem, data, offset) => {
  const asBytes = new Uint8Array(mem.buffer, offset, data.length)
  asBytes.set(data)
}

const memget = (mem, offset, length) => {
  return Buffer.from(new Uint8Array(mem.buffer, offset, length))
}

const wasmFile = fs.readFileSync(path.join(__dirname, 'keccak256_rhash.wasm'))
const mod = new WebAssembly.Module(wasmFile)
const instance = new WebAssembly.Instance(mod)
const mem = instance.exports.memory
const heapBase = instance.exports.__data_end

module.exports = (a) => {
  data = a
  // Zero out enough memory for input + output
  memset(mem, Buffer.alloc(a.length + 32), heapBase)

  // Write input to memory
  memset(mem, a, heapBase)

  try {
    instance.exports._main(heapBase + a.length, heapBase, a.length)
  } catch (e) {
    // console.log(e)
  }

  return memget(mem, heapBase + a.length, 32)
}

$ node --wasm-interpret-all --liftoff --no-wasm-tier-up sha3.js
start_keccak256: 0.376ms
result: <Buffer f1 88 5e da 54 b7 a0 53 31 8c d4 1e 20 93 22 0d ab 15 d6 53 81 b1 15 7a 36 33 a8 3b fd 5c 92 39>

$ md5 keccak256_rhash.wasm
MD5 (keccak256_rhash.wasm) = 28b206b953497614d5f10d6f77642c91

const fs = require('fs')
const path = require('path')

const memset = (mem, data, offset) => {
  const asBytes = new Uint8Array(mem.buffer, offset, data.length)
  asBytes.set(data)
}

const memget = (mem, offset, length) => {
  return Buffer.from(new Uint8Array(mem.buffer, offset, length))
}

const wasmFile = fs.readFileSync(path.join(__dirname, 'keccak256_rhash.wasm'))
const mod = new WebAssembly.Module(wasmFile)
const instance = new WebAssembly.Instance(mod, {})
const mem = instance.exports.memory
const heapBase = instance.exports.__data_end

function run(a) {
  data = a
  // Zero out enough memory for input + output
  memset(mem, Buffer.alloc(a.length + 32), heapBase)

  // Write input to memory
  memset(mem, a, heapBase)

  try {
    console.time("start_keccak256")
    instance.exports._main(heapBase + a.length, heapBase, a.length)
    console.timeEnd("start_keccak256")
  } catch (e) {
    // console.log(e)
  }

  return memget(mem, heapBase + a.length, 32)
}

let result = run(Buffer.from([1, 2, 3]));
console.log('result:', result);