Impl serde::Serialize for all types

eth2/utils/bls/src/signature.rs

@@ -1,6 +1,9 @@
 use super::{PublicKey, SecretKey};
 use bls_aggregates::Signature as RawSignature;
-use ssz::{decode_ssz_list, hash, Decodable, DecodeError, Encodable, SszStream, TreeHash};
+use serde::ser::{Serialize, Serializer};
+use ssz::{
+    decode_ssz_list, hash, ssz_encode, Decodable, DecodeError, Encodable, SszStream, TreeHash,
+};
 
 /// A single BLS signature.
 ///
@@ -63,6 +66,15 @@ impl TreeHash for Signature {
     }
 }
 
+impl Serialize for Signature {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_bytes(&ssz_encode(self))
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::super::Keypair;