请高手将下列代码转换成原码!

Question

$o="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";eval(base64_decode("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"));return;能说明一下原理么?

Answer 1

<script>
function decode64(param1){
      var output = "";
      var chr1, chr2, chr3 = "";
      var enc1, enc2, enc3, enc4 = "";
      var i = 0;      var base64test = /[^A-Za-z0-9\+\/\=]/g;
      if (base64test.exec(param1)) {
         alert("不是base64滴编码");
      }
      input = param1.replace(/[^A-Za-z0-9\+\/\=]/g, "");
      do {
         enc1 = keyStr.indexOf(input.charAt(i++));
         enc2 = keyStr.indexOf(input.charAt(i++));
         enc3 = keyStr.indexOf(input.charAt(i++));
         enc4 = keyStr.indexOf(input.charAt(i++));         chr1 = (enc1 << 2) | (enc2 >> 4);
         chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
         chr3 = ((enc3 & 3) << 6) | enc4;         output = output + String.fromCharCode(chr1);         if (enc3 != 64) {
            output = output + String.fromCharCode(chr2);
         }
         if (enc4 != 64) {
            output = output + String.fromCharCode(chr3);
         }         chr1 = chr2 = chr3 = "";
         enc1 = enc2 = enc3 = enc4 = "";      } while (i < input.length);
      return output;
   }
</script>逆回来,就可以看到里面的内容了,eval用来执行

Answer 2

将eval改成echo你就能看到所谓“隐藏起来的源码”了。 解出来还是有隐藏，得继续解下去
$lll=0;eval(base64_decode("JGxsbGxsbGxsbGxsPSdiYXNlNjRfZGVjb2RlJzs="));$ll=0;eval($lllllllllll("JGxsbGxsbGxsbGw9J29yZCc7"));$llll=0;$lllll=3;eval($lllllllllll("JGw9JGxsbGxsbGxsbGxsKCRvKTs="));$lllllll=0;$llllll=($llllllllll($l[1])<<8)+$llllllllll($l[2]);eval($lllllllllll("JGxsbGxsbGxsbGxsbGw9J3N0cmxlbic7"));$lllllllll=16;$llllllll="";for(;$lllll<$lllllllllllll($l);){if($lllllllll==0){$llllll=($llllllllll($l[$lllll++])<<8);$llllll+=$llllllllll($l[$lllll++]);$lllllllll=16;}if($llllll&0x8000){$lll=($llllllllll($l[$lllll++])<<4);$lll+=($llllllllll($l[$lllll])>>4);if($lll){$ll=($llllllllll($l[$lllll++])&0x0f)+3;for($llll=0;$llll<$ll;$llll++)$llllllll[$lllllll+$llll]=$llllllll[$lllllll-$lll+$llll];$lllllll+=$ll;}else{$ll=($llllllllll($l[$lllll++])<<8);$ll+=$llllllllll($l[$lllll++])+16;for($llll=0;$llll<$ll;$llllllll[$lllllll+$llll++]=$llllllllll($l[$lllll]));$lllll++;$lllllll+=$ll;}}else$llllllll[$lllllll++]=$llllllllll($l[$lllll++]);$llllll<<=1;$lllllllll--;}eval($lllllllllll("JGxsbGxsbGxsbGxsbD0nY2hyJzs="));$lllll=0;eval($lllllllllll("JGxsbGxsbGxsbD0iPyIuJGxsbGxsbGxsbGxsbCg2Mik7"));$llllllllll="";for(;$lllll<$lllllll;){$llllllllll.=$llllllllllll($llllllll[$lllll++]^0x07);}eval($lllllllllll("JGxsbGxsbGxsbC49JGxsbGxsbGxsbGwuJGxsbGxsbGxsbGxsbCg2MCkuIj8iOw=="));eval($lllllllll);