github.com/bigzoro/my_simplechain@v0.0.0-20240315012955-8ad0a2a29bb9/consensus/pbft/utils.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package pbft
    18  
    19  import (
    20  	"github.com/bigzoro/my_simplechain/common"
    21  	"github.com/bigzoro/my_simplechain/crypto"
    22  	"github.com/bigzoro/my_simplechain/log"
    23  	"github.com/bigzoro/my_simplechain/rlp"
    24  
    25  	"golang.org/x/crypto/sha3"
    26  )
    27  
    28  func RLPHash(v interface{}) (h common.Hash) {
    29  	hw := sha3.NewLegacyKeccak256()
    30  	rlp.Encode(hw, v)
    31  	hw.Sum(h[:0])
    32  	return h
    33  }
    34  
    35  // GetSignatureAddress gets the signer address from the signature
    36  func GetSignatureAddress(data []byte, sig []byte) (common.Address, error) {
    37  	// 1. Keccak data
    38  	hashData := crypto.Keccak256(data)
    39  	// 2. Recover public key
    40  	pubkey, err := crypto.SigToPub(hashData, sig)
    41  	if err != nil {
    42  		return common.Address{}, err
    43  	}
    44  	return crypto.PubkeyToAddress(*pubkey), nil
    45  }
    46  
    47  func CheckValidatorSignature(valSet ValidatorSet, data []byte, sig []byte) (common.Address, error) {
    48  	// 1. Get signature address
    49  	signer, err := GetSignatureAddress(data, sig)
    50  	if err != nil {
    51  		log.Error("Failed to get signer address", "err", err)
    52  		return common.Address{}, err
    53  	}
    54  
    55  	// 2. Check validator
    56  	if _, val := valSet.GetByAddress(signer); val != nil {
    57  		return val.Address(), nil
    58  	}
    59  
    60  	return common.Address{}, ErrUnauthorizedAddress
    61  }