Function _encipher

index.js:738–855

* @param {Array. } lr * @param {number} off * @param {Array. } P * @param {Array. } S * @returns {Array. } * @inner

(lr, off, P, S)

 * @inner
 */
function _encipher(lr, off, P, S) {
  // This is our bottleneck: 1714/1905 ticks / 90% - see profile.txt
  var n,
    l = lr[off],
    r = lr[off + 1];

  l ^= P[0];

  /*
    for (var i=0, k=BLOWFISH_NUM_ROUNDS-2; i<=k;)
        // Feistel substitution on left word
        n  = S[l >>> 24],
        n += S[0x100 | ((l >> 16) & 0xff)],
        n ^= S[0x200 | ((l >> 8) & 0xff)],
        n += S[0x300 | (l & 0xff)],
        r ^= n ^ P[++i],
        // Feistel substitution on right word
        n  = S[r >>> 24],
        n += S[0x100 | ((r >> 16) & 0xff)],
        n ^= S[0x200 | ((r >> 8) & 0xff)],
        n += S[0x300 | (r & 0xff)],
        l ^= n ^ P[++i];
    */

  //The following is an unrolled version of the above loop.
  //Iteration 0
  n = S[l >>> 24];
  n += S[0x100 | ((l >> 16) & 0xff)];
  n ^= S[0x200 | ((l >> 8) & 0xff)];
  n += S[0x300 | (l & 0xff)];
  r ^= n ^ P[1];
  n = S[r >>> 24];
  n += S[0x100 | ((r >> 16) & 0xff)];
  n ^= S[0x200 | ((r >> 8) & 0xff)];
  n += S[0x300 | (r & 0xff)];
  l ^= n ^ P[2];
  //Iteration 1
  n = S[l >>> 24];
  n += S[0x100 | ((l >> 16) & 0xff)];
  n ^= S[0x200 | ((l >> 8) & 0xff)];
  n += S[0x300 | (l & 0xff)];
  r ^= n ^ P[3];
  n = S[r >>> 24];
  n += S[0x100 | ((r >> 16) & 0xff)];
  n ^= S[0x200 | ((r >> 8) & 0xff)];
  n += S[0x300 | (r & 0xff)];
  l ^= n ^ P[4];
  //Iteration 2
  n = S[l >>> 24];
  n += S[0x100 | ((l >> 16) & 0xff)];
  n ^= S[0x200 | ((l >> 8) & 0xff)];
  n += S[0x300 | (l & 0xff)];
  r ^= n ^ P[5];
  n = S[r >>> 24];
  n += S[0x100 | ((r >> 16) & 0xff)];
  n ^= S[0x200 | ((r >> 8) & 0xff)];
  n += S[0x300 | (r & 0xff)];
  l ^= n ^ P[6];