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signer.go
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signer.go
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// Copyright 2021 Evmos Foundation
// This file is part of Evmos' Ethermint library.
//
// The Ethermint 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 Ethermint 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 Ethermint library. If not, see https://github.com/airchains-network/rollup-evm/blob/main/LICENSE
package tx
import (
"fmt"
"github.com/cosmos/cosmos-sdk/crypto/keyring"
cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/airchains-network/rollup-evm/crypto/ethsecp256k1"
)
var _ keyring.Signer = &Signer{}
// Signer defines a type that is used on testing for signing MsgEthereumTx
type Signer struct {
privKey cryptotypes.PrivKey
}
func NewSigner(sk cryptotypes.PrivKey) keyring.Signer {
return &Signer{
privKey: sk,
}
}
// Sign signs the message using the underlying private key
func (s Signer) Sign(_ string, msg []byte) ([]byte, cryptotypes.PubKey, error) {
if s.privKey.Type() != ethsecp256k1.KeyType {
return nil, nil, fmt.Errorf(
"invalid private key type for signing ethereum tx; expected %s, got %s",
ethsecp256k1.KeyType,
s.privKey.Type(),
)
}
sig, err := s.privKey.Sign(msg)
if err != nil {
return nil, nil, err
}
return sig, s.privKey.PubKey(), nil
}
// SignByAddress sign byte messages with a user key providing the address.
func (s Signer) SignByAddress(address sdk.Address, msg []byte) ([]byte, cryptotypes.PubKey, error) {
signer := sdk.AccAddress(s.privKey.PubKey().Address())
if !signer.Equals(address) {
return nil, nil, fmt.Errorf("address mismatch: signer %s ≠ given address %s", signer, address)
}
return s.Sign("", msg)
}