63 lines
2.1 KiB
Go
63 lines
2.1 KiB
Go
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package bind
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import (
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"crypto/ecdsa"
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"errors"
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"io"
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"io/ioutil"
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"github.com/ethereum/go-ethereum/accounts/keystore"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto"
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)
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// NewTransactor is a utility method to easily create a transaction signer from
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// an encrypted json key stream and the associated passphrase.
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func NewTransactor(keyin io.Reader, passphrase string) (*TransactOpts, error) {
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json, err := ioutil.ReadAll(keyin)
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if err != nil {
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return nil, err
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}
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key, err := keystore.DecryptKey(json, passphrase)
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if err != nil {
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return nil, err
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}
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return NewKeyedTransactor(key.PrivateKey), nil
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}
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// NewKeyedTransactor is a utility method to easily create a transaction signer
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// from a single private key.
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func NewKeyedTransactor(key *ecdsa.PrivateKey) *TransactOpts {
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keyAddr := crypto.PubkeyToAddress(key.PublicKey)
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return &TransactOpts{
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From: keyAddr,
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Signer: func(signer types.Signer, address common.Address, tx *types.Transaction) (*types.Transaction, error) {
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if address != keyAddr {
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return nil, errors.New("not authorized to sign this account")
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}
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signature, err := crypto.Sign(signer.Hash(tx).Bytes(), key)
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if err != nil {
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return nil, err
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}
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return tx.WithSignature(signer, signature)
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},
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}
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}
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