Function _ekskey

index.js:900–929

* Expensive key schedule Blowfish. * @param {Array. } data * @param {Array. } key * @param {Array. } P * @param {Array. } S * @inner

(data, key, P, S)

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

/**
 * Internaly crypts a string.