diff --git a/src/auth.ts b/src/auth.ts
index b775c1b..ecc6211 100644
--- a/src/auth.ts
+++ b/src/auth.ts
@@ -7,9 +7,7 @@ import {
 import { Device } from "./device.ts";
 
 function toHex(data: Uint8Array): string {
-  return Array.from(data).map((b) => ("00" + b.toString(16)).slice(-2)).join(
-    "",
-  );
+  return Array.from(data).map((b) => b.toString(16)).join("");
 }
 async function generateHMAC(key: string, message: string) {
   const encoder = new TextEncoder();
diff --git a/static/index.html b/static/index.html
index 6bc5a55..c73d1c7 100644
--- a/static/index.html
+++ b/static/index.html
@@ -82,9 +82,7 @@
   <script>
     function preventDefault(e) {alert(); e.preventDefault()}
     function toHex(data) {
-      return Array.from(data).map((b) => ("00" + b.toString(16)).slice(-2)).join(
-        "",
-      );
+      return Array.from(data).map((b) => b.toString(16)).join("");
     }
     async function generateHMAC(key, message) {
       const encoder = new TextEncoder();