react-native-scryptsy/lib/scryptSync.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, smixSync } = require("./utils");

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

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

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

module.exports = scrypt;