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multi: use key locator for lnwallet.MessageSigner

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To simplify the message signing API even further, we refactor the
lnwallet.MessageSigner interface to use a key locator instead of the
public key to identify which key should be signed with.
This commit is contained in:
Oliver Gugger
2021-09-23 16:54:30 +02:00
parent afa03f22cc
commit e79d59dd4c
19 changed files with 184 additions and 102 deletions
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14
lnwallet/btcwallet/signer.go
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@@ -126,11 +126,13 @@ func (b *BtcWallet) deriveKeyByLocator(keyLoc keychain.KeyLocator) (*btcec.Priva
// fetchPrivKey attempts to retrieve the raw private key corresponding to the
// passed public key if populated, or the key descriptor path (if non-empty).
func (b *BtcWallet) fetchPrivKey(keyDesc *keychain.KeyDescriptor) (*btcec.PrivateKey, error) {
func (b *BtcWallet) fetchPrivKey(
keyDesc *keychain.KeyDescriptor) (*btcec.PrivateKey, error) {
// If the key locator within the descriptor *isn't* empty, then we can
// directly derive the keys raw.
emptyLocator := keyDesc.KeyLocator.IsEmpty()
if !emptyLocator {
if !emptyLocator || keyDesc.PubKey == nil {
return b.deriveKeyByLocator(keyDesc.KeyLocator)
}
@@ -259,18 +261,18 @@ func (b *BtcWallet) ComputeInputScript(tx *wire.MsgTx,
var _ input.Signer = (*BtcWallet)(nil)
// SignMessage attempts to sign a target message with the private key that
// corresponds to the passed public key. If the target private key is unable to
// corresponds to the passed key locator. If the target private key is unable to
// be found, then an error will be returned. The actual digest signed is the
// double SHA-256 of the passed message.
//
// NOTE: This is a part of the MessageSigner interface.
func (b *BtcWallet) SignMessage(pubKey *btcec.PublicKey,
msg []byte) (input.Signature, error) {
func (b *BtcWallet) SignMessage(keyLoc keychain.KeyLocator,
msg []byte) (*btcec.Signature, error) {
// First attempt to fetch the private key which corresponds to the
// specified public key.
privKey, err := b.fetchPrivKey(&keychain.KeyDescriptor{
PubKey: pubKey,
KeyLocator: keyLoc,
})
if err != nil {
return nil, err