Function _key

index.js:876–890

* @param {Array. } key * @param {Array. } P * @param {Array. } S * @inner

(key, P, S)

 * @inner
 */
function _key(key, P, S) {
  var offset = 0,
    lr = [0, 0],
    plen = P.length,
    slen = S.length,
    sw;
  for (var i = 0; i < plen; i++)
    (sw = _streamtoword(key, offset)),
      (offset = sw.offp),
      (P[i] = P[i] ^ sw.key);
  for (i = 0; i < plen; i += 2)
    (lr = _encipher(lr, 0, P, S)), (P[i] = lr[0]), (P[i + 1] = lr[1]);
  for (i = 0; i < slen; i += 2)
    (lr = _encipher(lr, 0, P, S)), (S[i] = lr[0]), (S[i + 1] = lr[1]);
}

/**
 * Expensive key schedule Blowfish.