From 664e41b703e70c9a05a2b4358b78fc5d56fa6173 Mon Sep 17 00:00:00 2001
From: Ganesh Annan <gannan@digitalbazaar.com>
Date: Wed, 6 Nov 2024 21:54:31 +0100
Subject: [PATCH] Add fix for jcs suites.

---
 CHANGELOG.md    |  5 +++++
 lib/ProofSet.js | 12 ++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e4325a5..a05027a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # jsonld-signatures ChangeLog
 
+## 11.3.2 - 2024-11-xx
+
+### Fixed
+- Ensure `proof.@context` is unmodified for JCS Data Integrity Cryptosuites.
+
 ## 11.3.1 - 2024-10-02
 
 ### Fixed
diff --git a/lib/ProofSet.js b/lib/ProofSet.js
index ae911e39..3641c79e 100644
--- a/lib/ProofSet.js
+++ b/lib/ProofSet.js
@@ -224,10 +224,14 @@ function _getProofs({document}) {
 
   // shallow copy proofs and add document context or SECURITY_CONTEXT_URL
   const context = document['@context'] || constants.SECURITY_CONTEXT_URL;
-  proofSet = proofSet.map(proof => ({
-    '@context': context,
-    ...proof
-  }));
+  proofSet = proofSet.map(proof => {
+    const {cryptosuite} = proof;
+    // JCS Data Integrity Suites require unmodified proofs
+    if(cryptosuite && cryptosuite.includes('-jcs-')) {
+      return proof;
+    }
+    return {'@context': context, ...proof};
+  });
 
   return proofSet;
 }