Strip out old code

All of these files have been moved to either:

- https://github.com/sigp/lighthouse-beacon
- https://github.com/sigp/lighthouse-validator
- https://github.com/sigp/lighthouse-common

For rationale, see: https://github.com/sigp/lighthouse/issues/197

eth2/utils/bls/src/lib.rs

@@ -1,52 +0,0 @@
-extern crate bls_aggregates;
-extern crate hashing;
-extern crate ssz;
-
-mod aggregate_signature;
-mod keypair;
-mod public_key;
-mod secret_key;
-mod signature;
-
-pub use crate::aggregate_signature::AggregateSignature;
-pub use crate::keypair::Keypair;
-pub use crate::public_key::PublicKey;
-pub use crate::secret_key::SecretKey;
-pub use crate::signature::Signature;
-
-pub use self::bls_aggregates::AggregatePublicKey;
-
-pub const BLS_AGG_SIG_BYTE_SIZE: usize = 97;
-
-use hashing::hash;
-use ssz::ssz_encode;
-use std::default::Default;
-
-fn extend_if_needed(hash: &mut Vec<u8>) {
-    // NOTE: bls_aggregates crate demands 48 bytes, this may be removed as we get closer to production
-    hash.resize(48, Default::default())
-}
-
-/// For some signature and public key, ensure that the signature message was the public key and it
-/// was signed by the secret key that corresponds to that public key.
-pub fn verify_proof_of_possession(sig: &Signature, pubkey: &PublicKey) -> bool {
-    let mut hash = hash(&ssz_encode(pubkey));
-    extend_if_needed(&mut hash);
-    sig.verify_hashed(&hash, &pubkey)
-}
-
-pub fn create_proof_of_possession(keypair: &Keypair) -> Signature {
-    let mut hash = hash(&ssz_encode(&keypair.pk));
-    extend_if_needed(&mut hash);
-    Signature::new_hashed(&hash, &keypair.sk)
-}
-
-pub fn bls_verify_aggregate(
-    pubkey: &AggregatePublicKey,
-    message: &[u8],
-    signature: &AggregateSignature,
-    _domain: u64,
-) -> bool {
-    // TODO: add domain
-    signature.verify(message, pubkey)
-}