multihashing-async/src/blake.js

multiple hash functions

'use strict'

// @ts-ignore - no types available
const blake = require('blakejs')

const minB = 0xb201
const minS = 0xb241

const blake2b = {
  init: blake.blake2bInit,
  update: blake.blake2bUpdate,
  digest: blake.blake2bFinal
}

const blake2s = {
  init: blake.blake2sInit,
  update: blake.blake2sUpdate,
  digest: blake.blake2sFinal
}

// Note that although this function doesn't do any asynchronous work, we mark
// the function as async because it must return a Promise to match the API
// for other functions that do perform asynchronous work (see sha.browser.js)
// eslint-disable-next-line

/**
 * @param {number} size
 * @param {any} hf
 * @returns {import('./types').Digest}
 */
const makeB2Hash = (size, hf) => async (data) => {
  const ctx = hf.init(size, null)
  hf.update(ctx, data)
  return hf.digest(ctx)
}

/**
 * @param {Record<number, import('./types').Digest>} table
 */
module.exports = (table) => {
  for (let i = 0; i < 64; i++) {
    table[minB + i] = makeB2Hash(i + 1, blake2b)
  }
  for (let i = 0; i < 32; i++) {
    table[minS + i] = makeB2Hash(i + 1, blake2s)
  }
}