Merge pull request #129 from xmtp/rygine/sender-hmac

Add `sender_mac` to MessageV2
xmtp · Jan 12, 2024 · b0b8b9b · b0b8b9b
2 parents ad333e6 + 3152e77
commit b0b8b9b
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diff --git a/proto/keystore_api/v1/keystore.proto b/proto/keystore_api/v1/keystore.proto
@@ -87,6 +87,7 @@ message EncryptResponse {
     // Wrapper object for success response
     message Success {
       xmtp.message_contents.Ciphertext encrypted = 1;
+      bytes sender_hmac = 2;
     }
 
     oneof response {

diff --git a/proto/message_contents/message.proto b/proto/message_contents/message.proto
@@ -45,6 +45,8 @@ message MessageV2 {
   bytes header_bytes = 1; // encapsulates encoded MessageHeaderV2
   // Ciphertext.payload MUST contain encrypted SignedContent
   Ciphertext ciphertext = 2;
+  // HMAC of the message ciphertext, with the HMAC key derived from the topic key
+  bytes sender_hmac = 3;
 }
 
 // Versioned Message