Use serde for KES

Author: iquerejeta

mithril-core/src/key_reg.rs

@@ -41,7 +41,7 @@ pub struct OpCert {
     issue_number: u64,
     start_kes_period: u64, // this is not the kes period used in signing/verifying
     cert_sig: EdSignature,
-    pub cold_vk: EdPublicKey,
+    cold_vk: EdPublicKey,
 }
 
 /// NewKeyReg that is set to eventually replace `KeyReg`

mithril-core/src/stm.rs

@@ -276,7 +276,7 @@ impl StmInitializer {
     ) -> Self {
         let sk = SigningKey::gen(rng);
         let pk = StmVerificationKeyPoP::from(&sk);
-        let kes_sk = Sum6Kes::from_bytes(kes_sk).expect("Invalid KES key provided"); // todo: handle this
+        let kes_sk: Sum6Kes = serde_cbor::from_slice(&kes_sk).expect("Invalid KES key provided"); // todo: handle this
         let kes_sig = Some(kes_sk.sign(kes_period, &pk.to_bytes()));
 
         Self {