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//License: Expat(MIT)
//Chrisoft Xiong 2017-2018
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.querySelector(`encrypted[enid="${id}"]`).getAttribute("hint");
document.getElementById("keyinp").onkeypress=function(e){if(e.keyCode==13)document.getElementById('btndecrypt').click();}
}
function hidedecryptui()
{
document.getElementById("decryptui").style.opacity="0";
setTimeout(function(){
document.getElementById("decryptui").style.display="none";
document.getElementById("keyinp").value="";
},500);
}
function _decrypt(id,ctr)
{
const aes=aesjs,sha256=Sha256;
const e=document.querySelector(`encrypted[enid="${id}"]`);
const cont=e.getAttribute("encont");
const bc=atob(cont);
const b=new Array(bc.length);
for(var i=0;i<bc.length;++i)b[i]=bc.charCodeAt(i);
const deccont=ctr.decrypt(b);
const hash=sha256.hash(aes.utils.hex.fromBytes(deccont),{msgFormat:'hex-bytes'})
if(hash!=e.getAttribute("hash"))return false;
e.innerHTML=aes.utils.utf8.fromBytes(deccont);
e.removeAttribute("encont");
return true;
}
function _memokey(id,enk)
{
try
{
const os=localStorage.getItem(`blogkeys${window.location.pathname}`);
const o=os&&os.length?JSON.parse(os):[];
o[Number(id)]=enk;
localStorage.setItem(`blogkeys${window.location.pathname}`,JSON.stringify(o));
}catch(e){console.warn(`local storage failed: ${e}`);}
}
async function decryptor(id,key)
{
const aes=aesjs,sha256=Sha256;
const keyu8=aes.utils.utf8.toBytes(document.getElementById("keyinp").value);
const saltu8=aes.utils.utf8.toBytes('hellwhymustiaddsalttothiscrap');
const enckey=await new Promise(
(resolv,rej)=>
{scrypt(keyu8,saltu8,1024,16,2,32,(e,p,k)=>{e?rej(e):k?resolv(k):undefined;});}
);
const ctr=new aes.ModeOfOperation.ctr(enckey);
if(!_decrypt(id,ctr))
{
alert("The decryption key you have entered could be wrong, please try again.");
return;
}
_memokey(id,enckey);
for(let i of document.querySelectorAll('encrypted[encont]'))
if(_decrypt(i.getAttribute('enid'),ctr))_memokey(i.getAttribute('enid'),enckey);
footnoter();document.getElementById('purgep').style.display='';
hidedecryptui();
}
function _purgep()
{
try{localStorage.removeItem(`blogkeys${window.location.pathname}`);}
catch(e){}
location.reload(true);
}
function _decryptonload()
{
let o;
try
{
const os=localStorage.getItem(`blogkeys${window.location.pathname}`);
o=os&&os.length?JSON.parse(os):[];
}catch(e){console.warn(`local storage failed: ${e}`);}
for(let i of o.entries())
if(i[1]&&i[1].length)_decrypt(Number(i[0]).toString(),new aesjs.ModeOfOperation.ctr(i[1]));
if(o.length){footnoter();document.getElementById('purgep').style.display='';}
}
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