/
signer.go
57 lines (49 loc) · 1.56 KB
/
signer.go
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/*
* Copyright 2022 LimeChain Ltd.
*
* 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.
*/
package evm
import (
"crypto/ecdsa"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/crypto"
log "github.com/sirupsen/logrus"
"math/big"
)
type Signer struct {
privateKey *ecdsa.PrivateKey
}
func NewEVMSigner(privateKey string) *Signer {
pk, err := crypto.HexToECDSA(privateKey)
if err != nil {
log.Fatalf("Invalid EVM Private Key provided: [%s]", privateKey)
}
return &Signer{privateKey: pk}
}
func (s *Signer) Sign(msg []byte) ([]byte, error) {
signature, err := crypto.Sign(msg, s.privateKey)
if err != nil {
return nil, err
}
// note: https://github.com/ethereum/go-ethereum/issues/19751
signature[64] += 27
return signature, nil
}
func (s *Signer) NewKeyTransactor(chainId *big.Int) (*bind.TransactOpts, error) {
return bind.NewKeyedTransactorWithChainID(s.privateKey, chainId)
}
func (s *Signer) Address() string {
publicKey := s.privateKey.Public().(*ecdsa.PublicKey)
return crypto.PubkeyToAddress(*publicKey).String()
}