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- //go:build !integration
- package lnwallet
- import (
- "github.com/lightningnetwork/lnd/channeldb"
- "github.com/lightningnetwork/lnd/keychain"
- "github.com/lightningnetwork/lnd/shachain"
- )
- // nextRevocationProducer creates a new revocation producer, deriving the
- // revocation root by applying ECDH to a new key from our revocation root
- // family and the multisig key we use for the channel. For taproot channels a
- // related shachain revocation root is also returned.
- func (l *LightningWallet) nextRevocationProducer(res *ChannelReservation,
- keyRing keychain.KeyRing,
- ) (shachain.Producer, shachain.Producer, error) {
- // Derive the next key in the revocation root family.
- nextRevocationKeyDesc, err := keyRing.DeriveNextKey(
- keychain.KeyFamilyRevocationRoot,
- )
- if err != nil {
- return nil, nil, err
- }
- // If the DeriveNextKey call returns the first key with Index 0, we need
- // to re-derive the key as the keychain/btcwallet.go DerivePrivKey call
- // special-cases Index 0.
- if nextRevocationKeyDesc.Index == 0 {
- nextRevocationKeyDesc, err = keyRing.DeriveNextKey(
- keychain.KeyFamilyRevocationRoot,
- )
- if err != nil {
- return nil, nil, err
- }
- }
- res.nextRevocationKeyLoc = nextRevocationKeyDesc.KeyLocator
- // Perform an ECDH operation between the private key described in
- // nextRevocationKeyDesc and our public multisig key. The result will be
- // used to seed the revocation producer.
- revRoot, err := l.ECDH(
- nextRevocationKeyDesc, res.ourContribution.MultiSigKey.PubKey,
- )
- if err != nil {
- return nil, nil, err
- }
- // Once we have the root, we can then generate our shachain producer
- // and from that generate the per-commitment point.
- shaChainRoot := shachain.NewRevocationProducer(revRoot)
- taprootShaChainRoot, err := channeldb.DeriveMusig2Shachain(shaChainRoot)
- if err != nil {
- return nil, nil, err
- }
- return shaChainRoot, taprootShaChainRoot, nil
- }
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