1 files changed, 73 insertions, 0 deletions
diff --git a/blog/sbs_2/decryptor.js b/blog/sbs_2/decryptor.js
new file mode 100644
index 0000000..dcd64e3
--- /dev/null
+++ b/blog/sbs_2/decryptor.js
@@ -0,0 +1,73 @@
+//License: Expat(MIT)
+//Chrisoft Xiong 2017
+// http://www.onicos.com/staff/iz/amuse/javascript/expert/utf.txt
+function Utf8ArrayToStr(array){
+    var out,i,len,c;
+    var char2,char3;
+    out="";
+    len=array.length;
+    i=0;
+    while(i<len){
+		c=array[i++];
+		switch(c>>4)
+		{
+		  case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:
+			// 0xxxxxxx
+			out+=String.fromCharCode(c);
+			break;
+		  case 12:case 13:
+			// 110x xxxx   10xx xxxx
+			char2=array[i++];
+			out+=String.fromCharCode(((c&0x1F)<<6)|(char2&0x3F));
+			break;
+		  case 14:
+			// 1110 xxxx  10xx xxxx  10xx xxxx
+			char2=array[i++];
+			char3=array[i++];
+			out+=String.fromCharCode(((c&0x0F)<<12)|
+						   ((char2&0x3F)<<6)|
+						   ((char3&0x3F)<<0));
+			break;
+		}
+    }
+    return out;
+}
+var decid;
+function decryptui(id)
+{
+	document.getElementById("decryptui").style.display="block";
+	document.getElementById("keyinp").focus();
+	setTimeout(function(){document.getElementById("decryptui").style.opacity="1";},20);
+	decid=id;
+	document.getElementById("keyhint").innerHTML="Hint: "+document.getElementById("encrypted"+id).getAttribute("hint");
+	document.getElementById("keyinp").onkeypress=function(e){if(e.keyCode==13)document.getElementById('btndecrypt').click();}
+}
+function hidedecryptui()
+{
+	document.getElementById("decryptui").style.opacity="0";
+	setTimeout(function(){
+		document.getElementById("decryptui").style.display="none";
+		document.getElementById("keyinp").value="";
+	},500);
+}
+function decryptor(id,key)
+{
+	var e=document.getElementById("encrypted"+id);
+	var cont=e.getAttribute("encont");
+	var bc=atob(cont);
+	var b=new Array(bc.length);
+	for(var i=0;i<bc.length;++i)b[i]=bc.charCodeAt(i);
+	var lkey=key.length;
+	var u8arr=new Uint8Array(b);
+	var hash=5381;
+	for(var i=0;i<u8arr.length;++i){u8arr[i]^=key.charCodeAt(i%lkey);hash=(hash*33)+u8arr[i];hash%=4294967296;}
+	if(hash!=parseInt(e.getAttribute("hash")))
+	{
+		alert("The decryption key you have entered could be wrong, please try again.");
+		return;
+	}
+	//e.innerHTML=new TextDecoder("utf-8").decode(u8arr);
+	e.innerHTML=Utf8ArrayToStr(u8arr);
+	footnoter();
+	hidedecryptui();
+}