PHP Obfuscation

[mister5317]

I found it a fun learning experience to make something as simple as "HELLO WORLD!" into a difficult process.

 

I obfuscated my PHP below to just echo "HELLO WORLD!". Anyone else have a better example to echo "HELLO WORLD!"?

 

<?php
// Output = HELLO WORLD!
function __e($_){echo$_;
}function __($_){__e(chr
($_));}function _a(){$__
=func_get_args();foreach
($__ as$k=>$v)$a[$k]=$v;
return$a;}foreach(_a(7,4
,+11,11,14,-33,22,14,17,
11,3,-32)as$k=>$v){__(65
+$v);}

 

Give it a shot, it more difficult to think of creative ways to make something out of the box like this.

[waynewex]

You should post this in the misc section.

[mister5317]

Shoot, sorry, I don't see a place to move it...

[waynewex]

Ah, just post a new topic.

[bossman]

im confused with what you mean by obfuscation...cant you just <? echo "HELLO WORLD!"; ?> ........?

[Batosi]

Yea he can but the point is to make it complex

[Daniel0]

function _f($z){return($z==1?0:($z==2?1:_f($z-1)+_f($z-2)));}$_a=array(0x38,0x2d,0x3c,0x2a,0x3d,0x45,0x36,0x24,0x21,0x3c,0x2c,0x51);$_b=array(0x6f,0x66,0x6d,0x65,0x70,0x62,0x60,0x69,0x70);for($i=0,$a=sizeof($_a),$b=sizeof($_b);$i<$a;++$i)print(chr($_a[$i]^($_b[$i%$b]+_f($i%3+3))));

 

Ninja points to whomever finds the easter egg(s).

[newbtophp]

If the obfuscation is formatted, it can be easily read, theirfore more easyier to deobfuscate 

 

<?php
  // Output = HELLO WORLD!
  function __e($_)
  {
      echo $_;
  }
  function __($_)
  {
      __e(chr($_));
  }
  function _a()
  {
      $__ = func_get_args();
      foreach ($__ as $k => $v)
          $a[$k] = $v;
      return $a;
  }
  foreach (_a(7, 4,  + 11, 11, 14, -33, 22, 14, 17, 11, 3, -32) as $k => $v) {
      __(65 + $v);
  }
?>

[Philip]

Pretend this post doesn't exist.

[corbin]

Pretend this post doesn't exist.

 

 

But it does!

 

 

Daniel:

 

 

A recursive function wrapped in an ugly ternary statement, numbers in hex representation and bit manipulation...  Wow!

[Daniel0]

A recursive function wrapped in an ugly ternary statement, numbers in hex representation and bit manipulation...  Wow!

 

Yeah, but it's a special recursive function, a particular type of bit manipulation and one of the number sequences have a special meaning and one of the number sequences have a special meaning if you fiddle a bit with it.

[corbin]

I figured your easter eggs had something to do with the numbers so I looked at them a bit but couldn't come up with anything....

[Daniel0]

The easter egg is 'phpfreaks'.

 

function _f($z){return($z==1?0:($z==2?1:_f($z-1)+_f($z-2)));}

$_a=array(0x38,0x2d,0x3c,0x2a,0x3d,0x45,0x36,0x24,0x21,0x3c,0x2c,0x51);

$_b=array(0x6f,0x66,0x6d,0x65,0x70,0x62,0x60,0x69,0x70);for($i=0,$a=sizeof($_a),$b=sizeof($_b);$i<$a;++$i)print(chr($_a[$i]^($_b[$i%$b]+_f($i%3+3))));

 

Here is how it works:

The function I defined is a recursive implementation of the Fibonacci sequence. The arrays $_a and $_b contain the strings HELLO WORLD! and phpfreaks. However, each character in $_b has been shifted upwards with the $i % 3 + 3th Fibonacci number. Then I applied a XOR shift on $_a with the Fibonacci shifted string.

 

The code I posted reverses this of course.

[JonnoTheDev]

Am I reading the Da Vinci Code here!

My god, you need to get out more!

[corbin]

Hrmmm, that would explain where the numbers came from then .

[PugJr]

Now we know why Daniel is one of the adminstrators here...

[lococobra]

Try this one on for size. Not all that complicated but it sure looks like a mess

 

$__="\142\141\163\145\66\64\137\144\145\143"
."\157\144\145";eval("\$_=$__('YS5mdW5jdGlvb
iAuZWNoby5iLmNoci5yZXR1cm4gLigzKy4pKjUubA');
");$_=explode('.',$_);function l($b){global 
$_;eval($$_[3]);}$_[8]("$_[1]$_[0]($$_[0]){ 
$_[2]$$_[0];}$_[1]$_[3]($$_[0]){ $_[5]$_[4](
$$_[0]);}");foreach(array(11.4,7.2,12.2,18.6
,6.6,3.4,20.8,12.8,19.8,18.6,10.6,3.6)as $__
){eval("\$c=($_[6]$__$_[7]);");$_[0]($_[3](
$c));}

 

EDIT: This was all done by hand by the way, as was my signature

[corbin]

Ewww!  Minus points for eval and global.

 

 

Perhaps I should keep my mouth shut though since I haven't even tried yet...