Update changelog; clean up comments/style a bit.

Author: dlongley

CHANGELOG.md

@@ -1,5 +1,12 @@
 # @digitalbazaar/http-digest-header Changelog
 
+## 2.3.0 - 2025-10-dd
+
+### Added
+- Support parsing a digest from structured field value, i.e., expressed as
+  a base64-encoded byte array that is wrapped in colons;
+  see: https://datatracker.ietf.org/doc/html/rfc9651#name-byte-sequences.
+
 ## 2.2.1 - 2025-10-08
 
 ### Fixed

lib/httpDigest.js

@@ -76,12 +76,13 @@ function _createMultihash({digest}) {
 }
 
 function _parseHeaderValue(headerValue) {
-  const [key, digest] = headerValue.split(/=(.+)/);
+  const [key, digestValue] = headerValue.split(/=(.+)/);
 
   let encodedDigest;
   let algorithm;
   if(key === 'mh') {
-    encodedDigest = digest;
+    encodedDigest = digestValue;
+
     // if `encodedDigest` starts with `uEi`, then it is a base64url-encoded
     // sha-256 multihash
     if(encodedDigest.startsWith('uEi')) {
@@ -91,8 +92,9 @@ function _parseHeaderValue(headerValue) {
         `Only base64url-encoded, sha-256 multihash is supported.`);
     }
   } else {
-    // Unwrap in case the base64-encoded digest bytes are wrapped in colons
-    encodedDigest = digest?.replace(/^:(.*):$/, '$1');
+    // per RFC 9651, the digest value could be a structured field value,
+    // expressed as a base64-encoded byte array wrapped in colons
+    encodedDigest = digestValue?.replace(/^:(.*):$/, '$1');
 
     algorithm = key.replace('-', '').toLowerCase();
     if(algorithm !== 'sha256') {