// Copyright 2017, 2018 Parity Technologies
//
// 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.
use hash256_std_hasher::Hash256StdHasher;
use hash_db::Hasher;
use types::Hash256;

pub fn keccak256(bytes: &[u8]) -> Hash256 {
    Hash256::from(ethers_core::utils::keccak256(bytes))
}

/// Keccak hasher.
#[derive(Default, Debug, Clone, PartialEq)]
pub struct KeccakHasher;

impl Hasher for KeccakHasher {
    type Out = Hash256;
    type StdHasher = Hash256StdHasher;

    const LENGTH: usize = 32;

    fn hash(x: &[u8]) -> Self::Out {
        keccak256(x)
    }
}