signatures: with sync messages

Sync messages carry, for each actor's writes, the latest signature the
sender checked; the receiver checks it once it holds the change.

Auth plan M5.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index f5b2db1..35e1e5f 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -704,6 +704,10 @@ pub(crate) struct SyncEnvelope {
     /// When the sender generated it, by its clock: the receiver takes how long it took
     /// to come (`swarm::hop`).
     pub(crate) sent: crate::clock::UnixMillis,
+    /// Signatures of changes (`document::signatures`): each actor's latest the sender
+    /// verified that it didn't send this peer yet, `signatures::MAX_PER_MESSAGE` at
+    /// most, as `signatures::pack` packs them.
+    pub(crate) signatures: serde_bytes::ByteBuf,
 }
 
 /// An epoch, as sync messages name it: its generation and the first bytes of its ID,