openethereum/accounts/ethkey/src/keccak.rs

// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.

// OpenEthereum 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.

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

use tiny_keccak::Keccak;

pub trait Keccak256<T> {
    fn keccak256(&self) -> T
    where
        T: Sized;
}

impl Keccak256<[u8; 32]> for [u8] {
    fn keccak256(&self) -> [u8; 32] {
        let mut keccak = Keccak::new_keccak256();
        let mut result = [0u8; 32];
        keccak.update(self);
        keccak.finalize(&mut result);
        result
    }
}