github.com/klaytn/klaytn@v1.12.1/blockchain/types/derivesha/concat.go (about)

     1  // Modifications Copyright 2018 The klaytn Authors
     2  // Copyright 2015 The go-ethereum Authors
     3  // This file is part of the go-ethereum library.
     4  //
     5  // The go-ethereum library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Lesser General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // The go-ethereum library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  // GNU Lesser General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public License
    16  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    17  //
    18  // This file is derived from core/types/derive_sha.go (2018/06/04).
    19  // Modified and improved for the klaytn development.
    20  
    21  package derivesha
    22  
    23  import (
    24  	"github.com/klaytn/klaytn/blockchain/types"
    25  	"github.com/klaytn/klaytn/common"
    26  	"github.com/klaytn/klaytn/crypto/sha3"
    27  )
    28  
    29  // An alternative implementation of DeriveSha()
    30  // This function generates a hash of `DerivableList` as below:
    31  // 1. make a byte slice by concatenating RLP-encoded items
    32  // 2. make a hash of the byte slice.
    33  type DeriveShaConcat struct{}
    34  
    35  func (d DeriveShaConcat) DeriveSha(list types.DerivableList) (hash common.Hash) {
    36  	hasher := sha3.NewKeccak256()
    37  
    38  	for i := 0; i < list.Len(); i++ {
    39  		hasher.Write(list.GetRlp(i))
    40  	}
    41  	hasher.Sum(hash[:0])
    42  
    43  	return hash
    44  }