From 88265333ab47acdaa2a8c032014f09af1e3865dc Mon Sep 17 00:00:00 2001
From: M4rk9696 <nimalan.m@protonmail.com>
Date: Wed, 4 Sep 2019 19:50:13 +0530
Subject: [PATCH] Refractor createMask logic with crypto getRandomValues

---
 ws/mod.ts | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/ws/mod.ts b/ws/mod.ts
index df8cab01f8ec..9ad76299c390 100644
--- a/ws/mod.ts
+++ b/ws/mod.ts
@@ -188,11 +188,7 @@ export async function readFrame(buf: BufReader): Promise<WebSocketFrame> {
 
 // Create client-to-server mask, random 32bit number
 function createMask(): Uint8Array {
-  // TODO: use secure and immutable random function. Crypto.getRandomValues()
-  const arr = Array.from({ length: 4 }).map(
-    (): number => Math.round(Math.random() * 0xff)
-  );
-  return new Uint8Array(arr);
+  return crypto.getRandomValues(new Uint8Array(4));
 }
 
 class WebSocketImpl implements WebSocket {