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// Copyright 2015-2020 Parity Technologies (UK) Ltd. // This file is part of Tetsy Vapory. // Tetsy Vapory is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // Tetsy Vapory is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with Tetsy Vapory. If not, see <http://www.gnu.org/licenses/>. //! A signer used by Engines which need to sign messages. use vapory_types::{H256, Address}; use tetsy_crypto::publickey::{ecies, Public, Signature, KeyPair, Error}; /// Everything that an Engine needs to sign messages. pub trait EngineSigner: Send + Sync { /// Sign a consensus message hash. fn sign(&self, hash: H256) -> Result<Signature, Error>; /// Signing address fn address(&self) -> Address; /// Decrypt a message that was encrypted to this signer's key. fn decrypt(&self, auth_data: &[u8], cipher: &[u8]) -> Result<Vec<u8>, Error>; /// The signer's public key, if available. fn public(&self) -> Option<Public>; } /// Creates a new `EngineSigner` from given key pair. pub fn from_keypair(keypair: KeyPair) -> Box<dyn EngineSigner> { Box::new(Signer(keypair)) } struct Signer(KeyPair); impl EngineSigner for Signer { fn sign(&self, hash: H256) -> Result<Signature, Error> { tetsy_crypto::publickey::sign(self.0.secret(), &hash) } fn decrypt(&self, auth_data: &[u8], cipher: &[u8]) -> Result<Vec<u8>, Error> { ecies::decrypt(self.0.secret(), auth_data, cipher) } fn address(&self) -> Address { self.0.address() } fn public(&self) -> Option<Public> { Some(*self.0.public()) } }