Begin working on bls test

eth2/utils/bls/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2018"
 
 [dependencies]
-bls-aggregates = { git = "https://github.com/sigp/signature-schemes", tag = "0.6.1" }
+bls-aggregates = { git = "https://github.com/sigp/signature-schemes", branch = "secret-key-serialization" }
 cached_tree_hash = { path = "../cached_tree_hash" }
 hashing = { path = "../hashing" }
 hex = "0.3"

eth2/utils/bls/src/fake_aggregate_public_key.rs

@@ -25,4 +25,12 @@ impl FakeAggregatePublicKey {
     pub fn add(&mut self, _public_key: &PublicKey) {
         // No nothing.
     }
+
+    pub fn as_raw(&self) -> &FakeAggregatePublicKey {
+        &self
+    }
+
+    pub fn as_bytes(&self) -> Vec<u8> {
+        self.bytes.clone()
+    }
 }

eth2/utils/bls/src/lib.rs

@@ -8,6 +8,7 @@ mod secret_key;
 
 pub use crate::keypair::Keypair;
 pub use crate::secret_key::SecretKey;
+pub use bls_aggregates::{compress_g2, hash_on_g2};
 
 #[cfg(feature = "fake_crypto")]
 mod fake_aggregate_public_key;