50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/lightningnetwork/lnd/lnwallet"
|
|
"github.com/roasbeef/btcd/btcec"
|
|
"github.com/roasbeef/btcd/chaincfg/chainhash"
|
|
)
|
|
|
|
// nodeSigner is an implementation of the MessageSigner interface backed by the
|
|
// identity private key of running lnd node.
|
|
type nodeSigner struct {
|
|
privKey *btcec.PrivateKey
|
|
}
|
|
|
|
// newNodeSigner creates a new instance of the nodeSigner backed by the target
|
|
// private key.
|
|
func newNodeSigner(key *btcec.PrivateKey) *nodeSigner {
|
|
return &nodeSigner{
|
|
privKey: key,
|
|
}
|
|
}
|
|
|
|
// SignMessage signs a double-sha256 digest of the passed msg under the
|
|
// resident node private key. If the target public key is _not_ the node's
|
|
// private key, then an error will be returned.
|
|
func (n *nodeSigner) SignMessage(pubKey *btcec.PublicKey,
|
|
msg []byte) (*btcec.Signature, error) {
|
|
|
|
// If this isn't our identity public key, then we'll exit early with an
|
|
// error as we can't sign with this key.
|
|
if !pubKey.IsEqual(n.privKey.PubKey()) {
|
|
return nil, fmt.Errorf("unknown public key")
|
|
}
|
|
|
|
// Otherwise, we'll sign the dsha256 of the target message.
|
|
digest := chainhash.DoubleHashB(msg)
|
|
sign, err := n.privKey.Sign(digest)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("can't sign the message: %v", err)
|
|
}
|
|
|
|
return sign, nil
|
|
}
|
|
|
|
// A compile time check to ensure that nodeSigner implements the MessageSigner
|
|
// interface.
|
|
var _ lnwallet.MessageSigner = (*nodeSigner)(nil)
|