Impl serde::Serialize for all types

eth2/utils/bls/src/public_key.rs

@@ -1,6 +1,7 @@
 use super::SecretKey;
 use bls_aggregates::PublicKey as RawPublicKey;
 use hex::encode as hex_encode;
+use serde::ser::{Serialize, Serializer};
 use ssz::{
     decode_ssz_list, hash, ssz_encode, Decodable, DecodeError, Encodable, SszStream, TreeHash,
 };
@@ -55,6 +56,15 @@ impl Decodable for PublicKey {
     }
 }
 
+impl Serialize for PublicKey {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(&ssz_encode(self))
+    }
+}
+
 impl TreeHash for PublicKey {
     fn hash_tree_root(&self) -> Vec<u8> {
         hash(&self.0.as_bytes())