hash

hash.js

function hash(bits, len){
  var tt = [1,2,0,0,0,1,1,2,2];
  var st = [];
  for (var i=0; i<128; ++i)
    st.push(i%3);
  var os = [];
  for (var k=0, l=st.length, il=bits.length; k<il+len; ++k){
    for (var j=0; j<32; ++j){
      if (k < il)
        st[0] = bits[k];
      for (var i=j%2; i<l; i+=2){
        var x = i%l;
        var y = (i+1)%l;
        var a = st[x];
        var b = st[y];
        st[x] = tt[a*3+b];
        st[y] = tt[b*3+a];
      };
    };
    if (k >= il)
      os.push((st[0] + st[1]*3 + st[2]*9 + st[3]*27) % 2);
  };
  return os;
};