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input: extract to_local script builders

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Factor out the building of the delay and revoke scripts from
NewLocalCommitScriptTree so that they can be re-used later on.
This commit is contained in:
Elle Mouton 2023-08-23 11:09:10 +02:00
parent ba4021cad9
commit fde982ad78
No known key found for this signature in database
GPG Key ID: D7D916376026F177
1 changed files with 31 additions and 15 deletions
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46
input/script_utils.go
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@ -2124,27 +2124,14 @@ func NewLocalCommitScriptTree(csvTimeout uint32,
// First, we'll need to construct the tapLeaf that'll be our delay CSV
// clause.
builder := txscript.NewScriptBuilder()
builder.AddData(schnorr.SerializePubKey(selfKey))
builder.AddOp(txscript.OP_CHECKSIG)
builder.AddInt64(int64(csvTimeout))
builder.AddOp(txscript.OP_CHECKSEQUENCEVERIFY)
builder.AddOp(txscript.OP_DROP)
delayScript, err := builder.Script()
delayScript, err := TaprootLocalCommitDelayScript(csvTimeout, selfKey)
if err != nil {
return nil, err
}
// Next, we'll need to construct the revocation path, which is just a
// simple checksig script.
builder = txscript.NewScriptBuilder()
builder.AddData(schnorr.SerializePubKey(selfKey))
builder.AddOp(txscript.OP_DROP)
builder.AddData(schnorr.SerializePubKey(revokeKey))
builder.AddOp(txscript.OP_CHECKSIG)
revokeScript, err := builder.Script()
revokeScript, err := TaprootLocalCommitRevokeScript(selfKey, revokeKey)
if err != nil {
return nil, err
}
@ -2176,6 +2163,35 @@ func NewLocalCommitScriptTree(csvTimeout uint32,
}, nil
}
// TaprootLocalCommitDelayScript builds the tap leaf with the CSV delay script
// for the to-local output.
func TaprootLocalCommitDelayScript(csvTimeout uint32,
selfKey *btcec.PublicKey) ([]byte, error) {
builder := txscript.NewScriptBuilder()
builder.AddData(schnorr.SerializePubKey(selfKey))
builder.AddOp(txscript.OP_CHECKSIG)
builder.AddInt64(int64(csvTimeout))
builder.AddOp(txscript.OP_CHECKSEQUENCEVERIFY)
builder.AddOp(txscript.OP_DROP)
return builder.Script()
}
// TaprootLocalCommitRevokeScript builds the tap leaf with the revocation path
// for the to-local output.
func TaprootLocalCommitRevokeScript(selfKey, revokeKey *btcec.PublicKey) (
[]byte, error) {
builder := txscript.NewScriptBuilder()
builder.AddData(schnorr.SerializePubKey(selfKey))
builder.AddOp(txscript.OP_DROP)
builder.AddData(schnorr.SerializePubKey(revokeKey))
builder.AddOp(txscript.OP_CHECKSIG)
return builder.Script()
}
// TaprootCommitScriptToSelf creates the taproot witness program that commits
// to the revocation (script path) and delay path (script path) in a single
// taproot output key. Both the delay script and the revocation script are part