public class ISAAC {

    public ISAAC(int ai[]) {
  cryptArray = new int[256];
  keySetArray = new int[256];
  System.arraycopy(ai, 0, keySetArray, 0, ai.length);
  initializeKeySet();
    }

    public int getNextKey() {
  if (keyArrayIdx-- == 0) {
    generateNextKeySet();
    keyArrayIdx = 255;
  }
  return keySetArray[keyArrayIdx];
    }

    public void generateNextKeySet() {
  cryptVar2 += ++cryptVar3;
  for (int i = 0; i < 256; i++) {
    int j = cryptArray[i];
    if ((i & 3) == 0) {
    cryptVar1 ^= cryptVar1 << 13;
    } else if ((i & 3) == 1) {
    cryptVar1 ^= cryptVar1 >>> 6;
    } else if ((i & 3) == 2) {
    cryptVar1 ^= cryptVar1 << 2;
    } else if ((i & 3) == 3) {
    cryptVar1 ^= cryptVar1 >>> 16;
    }
    cryptVar1 += cryptArray[i + 128 & 0xff];
    int k;
    cryptArray[i] = k = cryptArray[(j & 0x3fc) >> 2] + cryptVar1 + cryptVar2;
    keySetArray[i] = cryptVar2 = cryptArray[(k >> 8 & 0x3fc) >> 2] + j;
  }

    }

    public final void initializeKeySet() {
  int i1;
  int j1;
  int k1;
  int l1;
  int i2;
  int j2;
  int k2;
  int l = i1 = j1 = k1 = l1 = i2 = j2 = k2 = 0x9e3779b9;
  for (int i = 0; i < 4; i++) {
    l ^= i1 << 11;
    k1 += l;
    i1 += j1;
    i1 ^= j1 >>> 2;
    l1 += i1;
    j1 += k1;
    j1 ^= k1 << 8;
    i2 += j1;
    k1 += l1;
    k1 ^= l1 >>> 16;
    j2 += k1;
    l1 += i2;
    l1 ^= i2 << 10;
    k2 += l1;
    i2 += j2;
    i2 ^= j2 >>> 4;
    l += i2;
    j2 += k2;
    j2 ^= k2 << 8;
    i1 += j2;
    k2 += l;
    k2 ^= l >>> 9;
    j1 += k2;
    l += i1;
  }

  for (int j = 0; j < 256; j += 8) {
    l += keySetArray[j];
    i1 += keySetArray[j + 1];
    j1 += keySetArray[j + 2];
    k1 += keySetArray[j + 3];
    l1 += keySetArray[j + 4];
    i2 += keySetArray[j + 5];
    j2 += keySetArray[j + 6];
    k2 += keySetArray[j + 7];
    l ^= i1 << 11;
    k1 += l;
    i1 += j1;
    i1 ^= j1 >>> 2;
    l1 += i1;
    j1 += k1;
    j1 ^= k1 << 8;
    i2 += j1;
    k1 += l1;
    k1 ^= l1 >>> 16;
    j2 += k1;
    l1 += i2;
    l1 ^= i2 << 10;
    k2 += l1;
    i2 += j2;
    i2 ^= j2 >>> 4;
    l += i2;
    j2 += k2;
    j2 ^= k2 << 8;
    i1 += j2;
    k2 += l;
    k2 ^= l >>> 9;
    j1 += k2;
    l += i1;
    cryptArray[j] = l;
    cryptArray[j + 1] = i1;
    cryptArray[j + 2] = j1;
    cryptArray[j + 3] = k1;
    cryptArray[j + 4] = l1;
    cryptArray[j + 5] = i2;
    cryptArray[j + 6] = j2;
    cryptArray[j + 7] = k2;
  }

  for (int k = 0; k < 256; k += 8) {
    l += cryptArray[k];
    i1 += cryptArray[k + 1];
    j1 += cryptArray[k + 2];
    k1 += cryptArray[k + 3];
    l1 += cryptArray[k + 4];
    i2 += cryptArray[k + 5];
    j2 += cryptArray[k + 6];
    k2 += cryptArray[k + 7];
    l ^= i1 << 11;
    k1 += l;
    i1 += j1;
    i1 ^= j1 >>> 2;
    l1 += i1;
    j1 += k1;
    j1 ^= k1 << 8;
    i2 += j1;
    k1 += l1;
    k1 ^= l1 >>> 16;
    j2 += k1;
    l1 += i2;
    l1 ^= i2 << 10;
    k2 += l1;
    i2 += j2;
    i2 ^= j2 >>> 4;
    l += i2;
    j2 += k2;
    j2 ^= k2 << 8;
    i1 += j2;
    k2 += l;
    k2 ^= l >>> 9;
    j1 += k2;
    l += i1;
    cryptArray[k] = l;
    cryptArray[k + 1] = i1;
    cryptArray[k + 2] = j1;
    cryptArray[k + 3] = k1;
    cryptArray[k + 4] = l1;
    cryptArray[k + 5] = i2;
    cryptArray[k + 6] = j2;
    cryptArray[k + 7] = k2;
  }

  generateNextKeySet();
  keyArrayIdx = 256;
    }
    private int keyArrayIdx;
    private int keySetArray[], cryptArray[];
    private int cryptVar1, cryptVar2, cryptVar3;
}