Missing piece of code in http://barnes-storming.blogspot.com/2011/08/encrypting-data-in-google-documents.html

gistfile1.js

function escape(t)
{
  var r='';
  for(var i=0;i<t.length;i++){
    var c=t.charCodeAt(i);
    var t1=Math.floor(c/16);
    var t2=c%16;
    if (t1<10) t1+=48;
    else t1+=55;
    if (t2<10) t2+=48;
    else t2+=55;
    r+=String.fromCharCode(t1)+String.fromCharCode(t2);
  }
  return r;
};



function unescape(t)
{
  var r='';
  for(i=0;i<t.length;i++){
    var t1=t.charCodeAt(i++);
    var t2=t.charCodeAt(i);
    if (t1<58) t1-=48;
    else {
      if (t1>96) t1-=87;
      else t1-=55;
    }
    if (t2<58) t2-=48;
    else {
      if (t2>96) t2-=87;
      else t2-=55;
    }
    r+=String.fromCharCode(t1*16+t2);
  }
  return r;
};