(function(){

var privateSign=function(txt){
    //Signature
    try{
        var key=document.querySelector(".privateSignKey").value.replace(/-+.+?PRIVATE.+?-+|\s/g,"");
        var byts=Base64.decode(key);
        var asn1=ASN1.decode(byts);
        if(asn1.sub.length<9){//PKCS#8
            asn1=asn1.sub[2].sub[0];
        };
        var get=function(n){
            var item=asn1.sub[n];
            var start = item.stream.pos+item.header;
            var end = item.stream.pos+item.header+item.length;
            var hex = item.stream.hexDump(start, end);
            hex=hex.replace(/\s/g,"");
            hex=hex.replace(/^00/g,"");//type=02 INTEGER:Remove the highest bit-filled 0x00
            return RSA.HexToB64(hex);
        };
        var n=get(1);
        var e=get(2);
        var d=get(3);
        
        var rsa=RSA(n,e,d);
        var sign=rsa.sign(txt,"SHA256");
        if(!rsa.verify(txt,sign,"SHA256")){
            alert("private key seems to be wrong!");
            return "";
        };
        return RSA.B64ToHex(sign);
    }catch(e){
        console.error(e);
        alert("private key parse error!");
        return "";
    }
};

var install=function(){
    HTMLInputElement.prototype._setAttribute=HTMLInputElement.prototype.setAttribute;
    HTMLInputElement.prototype.setAttribute=function(k,v){
        var This=this;
        This._setAttribute.apply(This,arguments);
        
        if(!(k=="placeholder"&&v==RESULT_PLACEHOLDER)){
            return;
        };
        var signExec=function(){
            var find=This.parentNode.querySelectorAll("input");
            var arr=[];
            for(var i=0;i<find.length;i++){
                if(find[i].value.indexOf("openssl")+1){
                    arr.push(find[i]);
                };
            };
            if(arr.length!=1){
                alert("no input box for signature was found!");
                return;
            };
            This.value=privateSign(/"(.+)"/.exec(arr[0].value)[1]);
        };
        
        setTimeout(signExec,100);
        //blur exec
        This._setAttribute(k,"blur retry autofill sign. "+v);
        if(!This.isBindSignExec){
            This.isBindSignExec=true;
            This.addEventListener("blur",function(){
                if(This.value==""){
                    signExec();
                };
            });
        };
    };
    
    var div=document.createElement("div");
    div.innerHTML=`
        <div class="field">
            <div style="color:#0b1">Account Privete Key (RSA PKCS#1 or PKCS#8) (It's just for signature!):</div>
            <textarea class="privateSignKey" placeholder="-----BEGIN RSA PRIVATE KEY----- OR -----BEGIN PRIVATE KEY----- ..."></textarea>
        </div>
    `;
    validate_account.appendChild(div);
};

var script=document.createElement("script");
script.src="https://xiangyuecn.github.io/Recorder/assets/ztest-rsa.js";
script.onload=function(){
    setTimeout(function(){
        install();
    },1000);//emmm... doc was ready
};
document.querySelector("head").appendChild(script);

})();