fix: add a proof for phase 4

LatticeX-Foundation · Sep 30, 2022 · c4b6d01 · c4b6d01
1 parent f782148
commit c4b6d01
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Showing 2 changed files with 11 additions and 0 deletions.
diff --git a/multi_party_ecdsa/src/protocols/multi_party/dmz21/message.rs b/multi_party_ecdsa/src/protocols/multi_party/dmz21/message.rs
@@ -116,6 +116,7 @@ pub struct SignPhaseThreeMsg {
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct SignPhaseFourMsg {
     pub open: DlogCommitmentOpen,
+    pub dl_proof: DLogProof<CU, sha2::Sha256>,
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize)]

diff --git a/multi_party_ecdsa/src/protocols/multi_party/dmz21/sign.rs b/multi_party_ecdsa/src/protocols/multi_party/dmz21/sign.rs
@@ -475,6 +475,13 @@ impl SignPhase {
         ))?;
         DlogCommitment::verify_dlog(&msg_one.commitment, &msg.open)?;
 
+        DLogProof::verify(&msg.dl_proof).map_err(|why| {
+            format_err!(
+                "Verify dlog failed error in sign offline phase four, cause {}",
+                why
+            )
+        })?;
+
         Ok(())
     }
 
@@ -629,8 +636,11 @@ impl SignPhase {
 
                 if self.msgs.phase_three_msgs.len() == self.party_num {
                     self.phase_two_compute_delta_sum_msg()?;
+
+                    let dl_proof = DLogProof::<CU, sha2::Sha256>::prove(&self.gamma);
                     let msg_four = SignPhaseFourMsg {
                         open: self.dl_com.clone().open,
+                        dl_proof,
                     };
 
                     // todo: compatibility(self to self), 20220823