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hashing.go
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hashing.go
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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package types
import (
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/rlp"
"golang.org/x/crypto/sha3"
)
// hasherPool holds LegacyKeccak256 hashers for rlpHash.
var hasherPool = sync.Pool{
New: func() interface{} { return sha3.NewLegacyKeccak256() },
}
// rlpHash encodes x and hashes the encoded bytes.
func rlpHash(x interface{}) (h common.Hash) {
sha := hasherPool.Get().(crypto.KeccakState)
defer hasherPool.Put(sha)
sha.Reset()
_ = rlp.Encode(sha, x)
_, _ = sha.Read(h[:])
return h
}