From 2f8dce44d3f2be74b5c6ec0a2e7f4ceced715328 Mon Sep 17 00:00:00 2001
From: pennae <github@quasiparticle.net>
Date: Wed, 13 Jul 2022 10:33:30 +0200
Subject: initial import

---
 web/js/browser/lib/utils.js | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 web/js/browser/lib/utils.js

(limited to 'web/js/browser/lib/utils.js')

diff --git a/web/js/browser/lib/utils.js b/web/js/browser/lib/utils.js
new file mode 100644
index 0000000..5bf0383
--- /dev/null
+++ b/web/js/browser/lib/utils.js
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+const HEX_STRING = /^(?:[a-fA-F0-9]{2})+$/;
+export function hexToUint8(str) {
+    if (!HEX_STRING.test(str)) {
+        throw new Error(`invalid hex string: ${str}`);
+    }
+    const bytes = str.match(/[a-fA-F0-9]{2}/g);
+    return new Uint8Array(bytes.map((byte) => parseInt(byte, 16)));
+}
+export function uint8ToHex(array) {
+    return array.reduce((str, byte) => str + ('00' + byte.toString(16)).slice(-2), '');
+}
+export function uint8ToBase64(array) {
+    return btoa(String.fromCharCode(...array));
+}
+export function uint8ToBase64Url(array) {
+    return uint8ToBase64(array)
+        .replace(/=/g, '')
+        .replace(/\+/g, '-')
+        .replace(/\//g, '_');
+}
+export function xor(array1, array2) {
+    return new Uint8Array(array1.map((byte, i) => byte ^ array2[i]));
+}
-- 
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