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lnwallet/script_utils: expose commit script helpers

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Makes the helper methods for constructing witness script
hash and to-local outputs. This will allow watchtowers to
import and reuse this logic when sweeping outputs.
This commit is contained in:
Conner Fromknecht 2018-06-28 16:47:15 -07:00
parent 9205720bea
commit b507ea0ca3
No known key found for this signature in database
GPG Key ID: 39DE78FBE6ACB0EF
1 changed files with 7 additions and 7 deletions
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14
lnwallet/script_utils.go
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@ -46,9 +46,9 @@ const (
maxStateHint uint64 = (1 << 48) - 1 maxStateHint uint64 = (1 << 48) - 1
) )
// witnessScriptHash generates a pay-to-witness-script-hash public key script // WitnessScriptHash generates a pay-to-witness-script-hash public key script
// paying to a version 0 witness program paying to the passed redeem script. // paying to a version 0 witness program paying to the passed redeem script.
func witnessScriptHash(witnessScript []byte) ([]byte, error) { func WitnessScriptHash(witnessScript []byte) ([]byte, error) {
bldr := txscript.NewScriptBuilder() bldr := txscript.NewScriptBuilder()
bldr.AddOp(txscript.OP_0) bldr.AddOp(txscript.OP_0)
@ -98,7 +98,7 @@ func GenFundingPkScript(aPub, bPub []byte, amt int64) ([]byte, *wire.TxOut, erro
// With the 2-of-2 script in had, generate a p2wsh script which pays // With the 2-of-2 script in had, generate a p2wsh script which pays
// to the funding script. // to the funding script.
pkScript, err := witnessScriptHash(witnessScript) pkScript, err := WitnessScriptHash(witnessScript)
if err != nil { if err != nil {
return nil, nil, err return nil, nil, err
} }
@ -662,7 +662,7 @@ func createHtlcTimeoutTx(htlcOutput wire.OutPoint, htlcAmt btcutil.Amount,
if err != nil { if err != nil {
return nil, err return nil, err
} }
pkScript, err := witnessScriptHash(witnessScript) pkScript, err := WitnessScriptHash(witnessScript)
if err != nil { if err != nil {
return nil, err return nil, err
} }
@ -709,7 +709,7 @@ func createHtlcSuccessTx(htlcOutput wire.OutPoint, htlcAmt btcutil.Amount,
if err != nil { if err != nil {
return nil, err return nil, err
} }
pkScript, err := witnessScriptHash(witnessScript) pkScript, err := WitnessScriptHash(witnessScript)
if err != nil { if err != nil {
return nil, err return nil, err
} }
@ -902,7 +902,7 @@ func lockTimeToSequence(isSeconds bool, locktime uint32) uint32 {
return SequenceLockTimeSeconds | (locktime >> 9) return SequenceLockTimeSeconds | (locktime >> 9)
} }
// commitScriptToSelf constructs the public key script for the output on the // CommitScriptToSelf constructs the public key script for the output on the
// commitment transaction paying to the "owner" of said commitment transaction. // commitment transaction paying to the "owner" of said commitment transaction.
// If the other party learns of the preimage to the revocation hash, then they // If the other party learns of the preimage to the revocation hash, then they
// can claim all the settled funds in the channel, plus the unsettled funds. // can claim all the settled funds in the channel, plus the unsettled funds.
@ -919,7 +919,7 @@ func lockTimeToSequence(isSeconds bool, locktime uint32) uint32 {
// <timeKey> // <timeKey>
// OP_ENDIF // OP_ENDIF
// OP_CHECKSIG // OP_CHECKSIG
func commitScriptToSelf(csvTimeout uint32, selfKey, revokeKey *btcec.PublicKey) ([]byte, error) { func CommitScriptToSelf(csvTimeout uint32, selfKey, revokeKey *btcec.PublicKey) ([]byte, error) {
// This script is spendable under two conditions: either the // This script is spendable under two conditions: either the
// 'csvTimeout' has passed and we can redeem our funds, or they can // 'csvTimeout' has passed and we can redeem our funds, or they can
// produce a valid signature with the revocation public key. The // produce a valid signature with the revocation public key. The