openethereum/util/keccak-hasher/src/lib.rs

// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum 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.

// Parity Ethereum 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 Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

//! Hasher implementation for the Keccak-256 hash
extern crate hash_db;
extern crate ethereum_types;
extern crate tiny_keccak;
extern crate plain_hasher;

use hash_db::Hasher;
use ethereum_types::H256;
use tiny_keccak::Keccak;
use plain_hasher::PlainHasher;
/// Concrete `Hasher` impl for the Keccak-256 hash
#[derive(Default, Debug, Clone, PartialEq)]
pub struct KeccakHasher;
impl Hasher for KeccakHasher {
	type Out = H256;
	type StdHasher = PlainHasher;
	const LENGTH: usize = 32;
	fn hash(x: &[u8]) -> Self::Out {
		let mut out = [0;32];
		Keccak::keccak256(x, &mut out);
		out.into()
	}
}