From: Ardis Lu <ardisglu@gmail.com>
Date: Sat, 25 Feb 2023 08:10:12 +0000 (-0800)
Subject: Add additionalData param
X-Git-Url: https://git.ardis.lu/?a=commitdiff_plain;h=30e2ad4705fd2374c7782592891a5738e5e47f0c;p=static-encrypt

Add additionalData param
---

diff --git a/decrypt.js b/decrypt.js
index 409c15a..ee4248b 100644
--- a/decrypt.js
+++ b/decrypt.js
@@ -5,7 +5,9 @@
  * @returns {Promise<string>} A promise that resolves to the plaintext.
  */
 export default async function decrypt(content, password) {
-  const encodedPassword = new TextEncoder().encode(password);
+  const encoder = new TextEncoder();
+  const encodedPassword = encoder.encode(password);
+  const additionalData = encoder.encode('https://github.com/ardislu/static-encrypt');
 
   const contentBuffer = Uint8Array.from(atob(content), c => c.charCodeAt(0));
   const salt = new Uint8Array(32);
@@ -37,7 +39,7 @@ export default async function decrypt(content, password) {
   );
 
   const encodedPlaintext = new Uint8Array(await crypto.subtle.decrypt(
-    { name: 'AES-GCM', iv },
+    { name: 'AES-GCM', iv, additionalData },
     key,
     ciphertext
   ));
diff --git a/encrypt.js b/encrypt.js
index 04e3e97..e53edc8 100644
--- a/encrypt.js
+++ b/encrypt.js
@@ -8,6 +8,7 @@ export default async function encrypt(plaintext, password) {
   const encoder = new TextEncoder();
   const encodedPlaintext = encoder.encode(plaintext);
   const encodedPassword = encoder.encode(password);
+  const additionalData = encoder.encode('https://github.com/ardislu/static-encrypt');
 
   const salt = new Uint8Array(32);
   const iv = new Uint8Array(12);
@@ -36,7 +37,7 @@ export default async function encrypt(plaintext, password) {
   );
 
   const ciphertext = new Uint8Array(await crypto.subtle.encrypt(
-    { name: 'AES-GCM', iv },
+    { name: 'AES-GCM', iv, additionalData },
     key,
     encodedPlaintext
   ));