function decrypt(ciphertext, password) {
  var v = new Array(2), k = new Array(4), s = "", i;

  for (var i=0; i<4; i++) k[i] = Str4ToLong(password.slice(i*4,(i+1)*4));

  ciphertext = unescCtrlCh(ciphertext);
  for (i=0; i<ciphertext.length; i+=8) {
    v[0] = Str4ToLong(ciphertext.slice(i,i+4));
    v[1] = Str4ToLong(ciphertext.slice(i+4,i+8));
    decode(v, k);
    s += LongToStr4(v[0]) + LongToStr4(v[1]);
  }
  s = s.replace(/\0+$/, '');
  return unescape(s);
}
function decode(v, k) {
  var y = v[0], z = v[1];
  var delta = 0x9E3779B9, sum = delta*32;

  while (sum != 0) {
    z -= (y<<4 ^ y>>>5)+y ^ sum+k[sum>>>11 & 3];
    sum -= delta;
    y -= (z<<4 ^ z>>>5)+z ^ sum+k[sum & 3];
  }
  v[0] = y; v[1] = z;
}
function Str4ToLong(s) {
  var v = 0;
  for (var i=0; i<4; i++) v |= s.charCodeAt(i) << i*8;
  return isNaN(v) ? 0 : v;
}

function LongToStr4(v) {
  var s = String.fromCharCode(v & 0xFF, v>>8 & 0xFF, v>>16 & 0xFF, v>>24 & 0xFF);
  return s;
}
function unescCtrlCh(str) {
  return str.replace(/!\d\d?\d?!/g, function(c) { return String.fromCharCode(c.slice(1,-1)); });
}