Feat: sign epoch in genesis certificate

mithril-aggregator/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mithril-aggregator"
-version = "0.5.75"
+version = "0.5.76"
 description = "A Mithril Aggregator server"
 authors = { workspace = true }
 edition = { workspace = true }

mithril-aggregator/src/tools/genesis.rs

@@ -110,6 +110,7 @@ impl GenesisTools {
         let protocol_message = CertificateGenesisProducer::create_genesis_protocol_message(
             &self.genesis_protocol_parameters,
             &self.genesis_avk,
+            &self.time_point.epoch,
         )?;
         target_file.write_all(protocol_message.compute_hash().as_bytes())?;
         Ok(())
@@ -135,6 +136,7 @@ impl GenesisTools {
         let genesis_protocol_message = CertificateGenesisProducer::create_genesis_protocol_message(
             &self.genesis_protocol_parameters,
             &self.genesis_avk,
+            &self.time_point.epoch,
         )?;
         let genesis_signature =
             genesis_producer.sign_genesis_protocol_message(genesis_protocol_message)?;

mithril-common/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mithril-common"
-version = "0.4.65"
+version = "0.4.66"
 description = "Common types, interfaces, and utilities for Mithril nodes."
 authors = { workspace = true }
 edition = { workspace = true }

mithril-common/src/certificate_chain/certificate_genesis.rs

@@ -43,6 +43,7 @@ impl CertificateGenesisProducer {
     pub fn create_genesis_protocol_message(
         genesis_protocol_parameters: &ProtocolParameters,
         genesis_avk: &ProtocolAggregateVerificationKey,
+        genesis_epoch: &Epoch,
     ) -> StdResult<ProtocolMessage> {
         let genesis_avk = genesis_avk.to_json_hex()?;
         let mut protocol_message = ProtocolMessage::new();
@@ -54,6 +55,10 @@ impl CertificateGenesisProducer {
             ProtocolMessagePartKey::NextProtocolParameters,
             genesis_protocol_parameters.compute_hash(),
         );
+        protocol_message.set_message_part(
+            ProtocolMessagePartKey::CurrentEpoch,
+            genesis_epoch.to_string(),
+        );
         Ok(protocol_message)
     }
 
@@ -94,7 +99,7 @@ impl CertificateGenesisProducer {
         );
         let previous_hash = "".to_string();
         let genesis_protocol_message =
-            Self::create_genesis_protocol_message(&protocol_parameters, &genesis_avk)?;
+            Self::create_genesis_protocol_message(&protocol_parameters, &genesis_avk, &epoch)?;
         Ok(Certificate::new(
             previous_hash,
             epoch,
@@ -117,9 +122,11 @@ mod tests {
         let fixture = MithrilFixtureBuilder::default().with_signers(5).build();
         let genesis_protocol_parameters = fixture.protocol_parameters();
         let genesis_avk = fixture.compute_avk();
+        let genesis_epoch = Epoch(123);
         let protocol_message = CertificateGenesisProducer::create_genesis_protocol_message(
             &genesis_protocol_parameters,
             &genesis_avk,
+            &genesis_epoch,
         )
         .unwrap();
 
@@ -135,5 +142,11 @@ mod tests {
             protocol_message.get_message_part(&ProtocolMessagePartKey::NextProtocolParameters),
             Some(&expected_genesis_protocol_parameters_value)
         );
+
+        let expected_genesis_epoch = genesis_epoch.to_string();
+        assert_eq!(
+            protocol_message.get_message_part(&ProtocolMessagePartKey::CurrentEpoch),
+            Some(&expected_genesis_epoch)
+        );
     }
 }

mithril-common/src/crypto_helper/tests_setup.rs

@@ -179,7 +179,8 @@ pub fn setup_certificate_chain(
     let genesis_verifier = genesis_signer.create_genesis_verifier();
     let genesis_producer = CertificateGenesisProducer::new(Some(Arc::new(genesis_signer)));
     let protocol_parameters = setup_protocol_parameters();
-    let mut epochs = (1..total_certificates + 2)
+    let genesis_epoch = Epoch(1);
+    let mut epochs = (genesis_epoch.0..total_certificates + 2)
         .map(|i| match certificates_per_epoch {
             0 => panic!("expected at least 1 certificate per epoch"),
             1 => Epoch(i),
@@ -250,6 +251,7 @@ pub fn setup_certificate_chain(
                         CertificateGenesisProducer::create_genesis_protocol_message(
                             next_protocol_parameters,
                             &next_avk,
+                            &genesis_epoch,
                         )
                         .unwrap();
                     let genesis_signature = genesis_producer

mithril-common/src/test_utils/mithril_fixture.rs

@@ -183,6 +183,7 @@ impl MithrilFixture {
         let genesis_protocol_message = CertificateGenesisProducer::create_genesis_protocol_message(
             &self.protocol_parameters,
             &genesis_avk,
+            &epoch,
         )
         .unwrap();
         let genesis_signature = genesis_producer