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lnwallet: use channel type to derive keys

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We abstract away how keys are generated for the different channel types
types (currently tweak(less)).

Intention is that more of the logic that is unique for each commitment
type lives in commitment.go, making the channel state machine oblivious
to the keys and outputs being created on the commitment tx for a given
channel state.
This commit is contained in:
Johan T. Halseth
2020-01-06 11:42:04 +01:00
parent 4fde31229c
commit 5e3718a1b5
8 changed files with 44 additions and 52 deletions
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11
lnwallet/commitment.go
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@@ -86,13 +86,16 @@ type CommitmentKeyRing struct {
RevocationKey *btcec.PublicKey
}
// DeriveCommitmentKey generates a new commitment key set using the base points
// and commitment point. The keys are derived differently depending whether the
// commitment transaction is ours or the remote peer's.
// DeriveCommitmentKeys generates a new commitment key set using the base points
// and commitment point. The keys are derived differently depending on the type
// of channel, and whether the commitment transaction is ours or the remote
// peer's.
func DeriveCommitmentKeys(commitPoint *btcec.PublicKey,
isOurCommit, tweaklessCommit bool,
isOurCommit bool, chanType channeldb.ChannelType,
localChanCfg, remoteChanCfg *channeldb.ChannelConfig) *CommitmentKeyRing {
tweaklessCommit := chanType.IsTweakless()
// First, we'll derive all the keys that don't depend on the context of
// whose commitment transaction this is.
keyRing := &CommitmentKeyRing{