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- // Copyright 2017 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 istanbul
- import (
- "github.com/ethereum/go-ethereum/common"
- "github.com/ethereum/go-ethereum/crypto"
- "github.com/ethereum/go-ethereum/log"
- "github.com/ethereum/go-ethereum/rlp"
- "golang.org/x/crypto/sha3"
- )
- func RLPHash(v interface{}) (h common.Hash) {
- hw := sha3.NewLegacyKeccak256()
- rlp.Encode(hw, v)
- hw.Sum(h[:0])
- return h
- }
- // GetSignatureAddress gets the signer address from the signature
- func GetSignatureAddress(data []byte, sig []byte) (common.Address, error) {
- // 1. Keccak data
- hashData := crypto.Keccak256(data)
- // 2. Recover public key
- pubkey, err := crypto.SigToPub(hashData, sig)
- if err != nil {
- return common.Address{}, err
- }
- return crypto.PubkeyToAddress(*pubkey), nil
- }
- // GetSignatureAddressNoHashing gets the signer address from the signature without first hashing the data
- func GetSignatureAddressNoHashing(data []byte, sig []byte) (common.Address, error) {
- pubkey, err := crypto.SigToPub(data, sig)
- if err != nil {
- return common.Address{}, err
- }
- return crypto.PubkeyToAddress(*pubkey), nil
- }
- func CheckValidatorSignature(valSet ValidatorSet, data []byte, sig []byte) (common.Address, error) {
- // 1. Get signature address
- signer, err := GetSignatureAddress(data, sig)
- if err != nil {
- log.Error("Failed to get signer address", "err", err)
- return common.Address{}, err
- }
- // 2. Check validator
- if _, val := valSet.GetByAddress(signer); val != nil {
- return val.Address(), nil
- }
- return common.Address{}, ErrUnauthorizedAddress
- }
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