diff --git a/src/chacha.js b/src/chacha.js
--- a/src/chacha.js
+++ b/src/chacha.js
@@ -5,7 +5,7 @@ function lrot(x,shift){
 	return (x<<shift|x>>>(32-shift))&MASK;
 }
 
-function createNonce(){
+export function createNonce(){
 	let nonce=new Uint8Array(12);
 	window.crypto.getRandomValues(nonce);
 	return Array.from(nonce);