Add TreeHash trait to all types and structs

eth2/utils/bls/src/public_key.rs

@@ -1,7 +1,9 @@
 use super::SecretKey;
 use bls_aggregates::PublicKey as RawPublicKey;
 use hex::encode as hex_encode;
-use ssz::{decode_ssz_list, ssz_encode, Decodable, DecodeError, Encodable, SszStream};
+use ssz::{
+    decode_ssz_list, hash, ssz_encode, Decodable, DecodeError, Encodable, SszStream, TreeHash,
+};
 use std::default;
 use std::hash::{Hash, Hasher};
 
@@ -53,6 +55,12 @@ impl Decodable for PublicKey {
     }
 }
 
+impl TreeHash for PublicKey {
+    fn hash_tree_root(&self) -> Vec<u8> {
+        hash(&self.0.as_bytes())
+    }
+}
+
 impl PartialEq for PublicKey {
     fn eq(&self, other: &PublicKey) -> bool {
         ssz_encode(self) == ssz_encode(other)