Suninatas Game 05

Posted on Edited on In Views: Disqus:

challenges

Game 05

Concepts: JS Packer, JSObfuscator

Challenge Code

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<input name="password" value="" style="width:180" />

<script>
  eval(function(p,a,c,k,e,r){e=function(c){return c.toString(a)};if(!''.replace(/^/,String)){while(c--)r[e(c)]=k[c]||e(c);k=[function(e){return r[e]}];e=function(){return'\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\b'+e(c)+'\b','g'),k[c]);return p}('g l=m o('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f');p q(n){g h='';g j=r;s(g i=t;i>0;){i-=4;g k=(n>>i)&u;v(!j||k!=0){j=w;h+=l[k]}}x(h==''?'0':h)}',34,34,'||||||||||||||||var|result||start|digit|digitArray|new||Array|function|PASS|true|for|32|0xf|if|false|return'.split('|'),0,{}))
</script>

<script>
  function init() {
    document.frm.password.value = "";
    document.frm.password.focus();
  }
</script>

Deobfuscated Code

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var digitArray = new Array(
  "0",
  "1",
  "2",
  "3",
  "4",
  "5",
  "6",
  "7",
  "8",
  "9",
  "a",
  "b",
  "c",
  "d",
  "e",
  "f",
);

function PASS(n) {
  var result = "";
  var start = true;
  for (var i = 32; i > 0; ) {
    i -= 4;
    var digit = (n >> i) & 0xf;
    if (!start || digit != 0) {
      start = false;
      result += digitArray[digit];
    }
  }
  return result == "" ? "0" : result;
}

Solution

Convert the hint using the PASS() function:

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PASS(12342046413275659);