react-native-scryptsy/lib/scrypt.js

Pure JavaScript implementation of the scrypt key deriviation function that is fully compatible with Node.js and the browser.

const crypto = require("./crypto");
const { checkAndInit, smix } = require("./utils");

// N = Cpu cost, r = Memory cost, p = parallelization cost
async function scrypt(
  key,
  salt,
  N,
  r,
  p,
  dkLen,
  progressCallback,
  promiseInterval
) {
  const { XY, V, B32, x, _X, B, tickCallback } = checkAndInit(
    key,
    salt,
    N,
    r,
    p,
    dkLen,
    progressCallback
  );

  for (var i = 0; i < p; i++) {
    await smix(
      B,
      i * 128 * r,
      r,
      N,
      V,
      XY,
      _X,
      B32,
      x,
      tickCallback,
      promiseInterval
    );
  }

  return crypto.pbkdf2Sync(key, B, 1, dkLen, "sha256");
}

module.exports = scrypt;