08eea0f0e4
To address increasing complexity in code that handles signatures, this PR discards all notion of "different" signature types at the library level. Both the crypto and accounts package is reduced to only be able to produce plain canonical secp256k1 signatures. This makes the crpyto APIs much cleaner, simpler and harder to abuse.
63 lines
2.1 KiB
Go
63 lines
2.1 KiB
Go
// 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"
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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 := accounts.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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