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input: pass input.Signature to multisig spend

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Modifies SpendMultiSig to accept input.Signature, so that we can
ultimately assert the size of multisig witnesses.
This commit is contained in:
Conner Fromknecht
2020-04-05 17:07:01 -07:00
parent 0f94b8dc62
commit f2b6e2af04
6 changed files with 87 additions and 50 deletions
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12
input/script_utils.go
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@@ -96,7 +96,9 @@ func GenFundingPkScript(aPub, bPub []byte, amt int64) ([]byte, *wire.TxOut, erro
// SpendMultiSig generates the witness stack required to redeem the 2-of-2 p2wsh
// multi-sig output.
func SpendMultiSig(witnessScript, pubA, sigA, pubB, sigB []byte) [][]byte {
func SpendMultiSig(witnessScript, pubA []byte, sigA Signature,
pubB []byte, sigB Signature) [][]byte {
witness := make([][]byte, 4)
// When spending a p2wsh multi-sig script, rather than an OP_0, we add
@@ -108,11 +110,11 @@ func SpendMultiSig(witnessScript, pubA, sigA, pubB, sigB []byte) [][]byte {
// ensure the signatures appear on the Script Virtual Machine stack in
// the correct order.
if bytes.Compare(pubA, pubB) == 1 {
witness[1] = sigB
witness[2] = sigA
witness[1] = append(sigB.Serialize(), byte(txscript.SigHashAll))
witness[2] = append(sigA.Serialize(), byte(txscript.SigHashAll))
} else {
witness[1] = sigA
witness[2] = sigB
witness[1] = append(sigA.Serialize(), byte(txscript.SigHashAll))
witness[2] = append(sigB.Serialize(), byte(txscript.SigHashAll))
}
// Finally, add the preimage as the last witness element.