From 301c962b9bf5431bc73fcf45567151b1ddad22d1 Mon Sep 17 00:00:00 2001
From: Garrett <garrettuffelman@me.com>
Date: Fri, 12 Jul 2024 12:11:50 -0400
Subject: [PATCH] Update hmac.js to include a better error for undefined key

When key is undefined, the user of the package will get the error

`Cannot read property 'sigBytes' of undefined`

This fix prevents that and returns an error that says that the key is undefined.
---
 src/hmac.js | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/hmac.js b/src/hmac.js
index 24762a9..0625608 100644
--- a/src/hmac.js
+++ b/src/hmac.js
@@ -25,10 +25,20 @@
             // Init hasher
             hasher = this._hasher = new hasher.init();
 
-            // Convert string to WordArray, else assume WordArray already
-            if (typeof key == 'string') {
+            if (key == null) { // This checks for both undefined and null
+                throw new Error("Key is undefined or null");
+              }
+            
+              // Convert string to WordArray, else assume WordArray already
+              if (typeof key == "string") {
                 key = Utf8.parse(key);
-            }
+              }
+            
+              // Determine if the key is missing any values - most notably, the 'sigBytes' property
+              if (!Object.prototype.hasOwnProperty.call(key, "sigBytes")) {
+                // throw error
+                throw new Error("Key missing 'sigBytes' property");
+              }
 
             // Shortcuts
             var hasherBlockSize = hasher.blockSize;