gistfile1.js

function hackcrypt(last, message) {
  var len = message.length;
  for(var ret = "", i = 0; i < len; i++)
    ret += chars[last = (i + last + message.charCodeAt(i)) % 64];
  return ret;
}

function uncrypt(endata){
  var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split(""),
      total = 0;
  for(var ll=59; ll; ll--){
    var ret = "", last = ll;
    for(var i=0,l=endata.length; i < l ; i++){
      var next_symb = 0;
      while( endata.substr(0, i+1) != 
             hackcrypt(ll, ret + chars[next_symb]).substr(0, i+1) && 
             next_symb < 64){
          next_symb++;
      }
      total += next_symb;
      if(next_symb == 64) break;
      ret += chars[next_symb];
    }
    if(encrypt(ret) == endata){
      console.log('Hash count: ', total, 'Password: ', ret);
      break;
    }
  }
}

uncrypt('mWodQ3pVKgLE');