diff --git a/chacha.js b/chacha.js
new file mode 100644
--- /dev/null
+++ b/chacha.js
@@ -0,0 +1,49 @@
+// https://tools.ietf.org/html/rfc7693
+
+MASK=0xffffffff;
+
+function int2bytes(x){
+	var res=new Array(4);
+	for(var i=0;i<4;i++){
+		res[i]=x&0xff;
+		x>>>=8;
+	}
+	return res;
+}
+
+function lrot(x,shift){
+	return (x<<shift|x>>>(32-shift))&MASK;
+}
+
+function quarterRound(arr,ia,ib,ic,id){
+	var a=arr[ia], b=arr[ib], c=arr[ic], d=arr[id];
+	a=(a+b)&MASK; d=lrot(d^a,16);
+	c=(c+d)&MASK; b=lrot(b^c,12);
+	a=(a+b)&MASK; d=lrot(d^a,8);
+	c=(c+d)&MASK; b=lrot(b^c,7);
+	arr[ia]=a; arr[ib]=b; arr[ic]=c; arr[id]=d;
+}
+
+function chacha(key,nonce,position){
+	var x=input.slice();
+
+	for(var i=0;i<10;i++){
+		// column round
+		quarterRound(x,0,4,8,12);
+		quarterRound(x,1,5,9,13);
+		quarterRound(x,2,6,10,14);
+		quarterRound(x,3,7,11,15);
+		// diagonal round
+		quarterRound(x,0,5,10,15);
+		quarterRound(x,1,6,11,12);
+		quarterRound(x,2,7,8,13);
+		quarterRound(x,3,4,9,14);
+	}
+
+	return x.map((xi,i)=>(xi+input[i])&MASK);
+}
+
+function encrypt(message,key){
+	var nonce=Date.now();
+	var nonce0=nonce;
+}