Application Crypto and BEEFY Support for paired (ECDSA,BLS) crypto (#1815)

Next step in process of making BEEFY being able to generate both ECDSA
and BLS signature after #1705. It allows BEEFY to use a pair of ECDSA
and BLS key as a AuthorityId.

---------

Co-authored-by: Davide Galassi <davxy@datawok.net>
Co-authored-by: Robert Hambrock <roberthambrock@gmail.com>

substrate/primitives/application-crypto/src/ecdsa_bls377.rs

@@ -0,0 +1,57 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! ECDSA and BLS12-377 paired crypto applications.
+
+use crate::{KeyTypeId, RuntimePublic};
+
+pub use sp_core::paired_crypto::ecdsa_bls377::*;
+
+mod app {
+	crate::app_crypto!(super, sp_core::testing::ECDSA_BLS377);
+}
+
+#[cfg(feature = "full_crypto")]
+pub use app::Pair as AppPair;
+pub use app::{Public as AppPublic, Signature as AppSignature};
+
+impl RuntimePublic for Public {
+	type Signature = Signature;
+
+	/// Dummy implementation. Returns an empty vector.
+	fn all(_key_type: KeyTypeId) -> Vec<Self> {
+		Vec::new()
+	}
+
+	fn generate_pair(key_type: KeyTypeId, seed: Option<Vec<u8>>) -> Self {
+		sp_io::crypto::ecdsa_bls377_generate(key_type, seed)
+	}
+
+	/// Dummy implementation. Returns `None`.
+	fn sign<M: AsRef<[u8]>>(&self, _key_type: KeyTypeId, _msg: &M) -> Option<Self::Signature> {
+		None
+	}
+
+	/// Dummy implementation. Returns `false`.
+	fn verify<M: AsRef<[u8]>>(&self, _msg: &M, _signature: &Self::Signature) -> bool {
+		false
+	}
+
+	fn to_raw_vec(&self) -> Vec<u8> {
+		sp_core::crypto::ByteArray::to_raw_vec(self)
+	}
+}

substrate/primitives/application-crypto/src/lib.rs

@@ -50,6 +50,8 @@ pub mod bls377;
 #[cfg(feature = "bls-experimental")]
 pub mod bls381;
 pub mod ecdsa;
+#[cfg(feature = "bls-experimental")]
+pub mod ecdsa_bls377;
 pub mod ed25519;
 pub mod sr25519;
 mod traits;