Add ssz_fixed_len method to ssz::Encode

eth2/types/src/lib.rs

@@ -86,5 +86,8 @@ pub type AttesterMap = HashMap<(u64, u64), Vec<usize>>;
 /// Maps a slot to a block proposer.
 pub type ProposerMap = HashMap<u64, usize>;
 
-pub use bls::{AggregatePublicKey, AggregateSignature, Keypair, PublicKey, SecretKey, Signature};
+pub use bls::{
+    AggregatePublicKey, AggregateSignature, Keypair, PublicKey, PublicKeyBytes, SecretKey,
+    Signature, SignatureBytes,
+};
 pub use ssz_types::{typenum, typenum::Unsigned, BitList, BitVector, FixedVector, VariableList};

eth2/types/src/slot_epoch_macros.rs

@@ -201,6 +201,10 @@ macro_rules! impl_ssz {
                 <u64 as Encode>::ssz_fixed_len()
             }
 
+            fn ssz_bytes_len(&self) -> usize {
+                0_u64.ssz_bytes_len()
+            }
+
             fn ssz_append(&self, buf: &mut Vec<u8>) {
                 self.0.ssz_append(buf)
             }