From: Ardis Lu <ardisglu@gmail.com>
Date: Sat, 25 Feb 2023 04:14:38 +0000 (-0800)
Subject: Don't hardcode array size
X-Git-Url: https://git.ardis.lu/?a=commitdiff_plain;h=49088b5f59307f60192e659e2347becd6b6e03f2;p=static-encrypt

Don't hardcode array size
---

diff --git a/decrypt.js b/decrypt.js
index cfa0606..9b5dd54 100644
--- a/decrypt.js
+++ b/decrypt.js
@@ -4,10 +4,10 @@ export default async function decrypt(content, password) {
   const contentBuffer = Uint8Array.from(atob(content), c => c.charCodeAt(0));
   const salt = new Uint8Array(32);
   const iv = new Uint8Array(12);
-  const ciphertext = new Uint8Array(contentBuffer.byteLength - 44);
-  salt.set(contentBuffer.slice(0, 32));
-  iv.set(contentBuffer.slice(32, 44));
-  ciphertext.set(contentBuffer.slice(44));
+  const ciphertext = new Uint8Array(contentBuffer.byteLength - salt.byteLength - iv.byteLength);
+  salt.set(contentBuffer.slice(0, salt.byteLength));
+  iv.set(contentBuffer.slice(salt.byteLength, salt.byteLength + iv.byteLength));
+  ciphertext.set(contentBuffer.slice(salt.byteLength + iv.byteLength));
 
   const keyMaterial = await crypto.subtle.importKey(
     'raw',