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lnwallet: support combined tweak to private key #10377

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lnwallet: support combined tweak to private key #10377

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23 changes: 21 additions & 2 deletions lnwallet/btcwallet/signer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -238,13 +238,32 @@ func (b *BtcWallet) fetchPrivKey(

// maybeTweakPrivKey examines the single and double tweak parameters on the
// passed sign descriptor and may perform a mapping on the passed private key
// in order to utilize the tweaks, if populated.
// in order to utilize the tweaks, if populated. If both tweak parameters are
// set, then both are applied in the following order:
//
// a) double tweak
// b) single tweak
func maybeTweakPrivKey(signDesc *input.SignDescriptor,
privKey *btcec.PrivateKey) (*btcec.PrivateKey, error) {

var retPriv *btcec.PrivateKey
switch {

// If both tweak parameters are set, then apply both.
if signDesc.DoubleTweak != nil && signDesc.SingleTweak != nil {
// First apply the double tweak.
retPriv = input.DeriveRevocationPrivKey(privKey,
signDesc.DoubleTweak)

// Then apply the single tweak.
retPriv = input.TweakPrivKey(retPriv,
signDesc.SingleTweak)

return retPriv, nil
}

// If only one tweak parameter is set, apply it respectively over the
// provided private key.
switch {
case signDesc.SingleTweak != nil:
retPriv = input.TweakPrivKey(privKey,
signDesc.SingleTweak)
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