// MakeSecp256k1MultiSigScript creates a multi-signature script that can be
// redeemed with nRequired signatures of the passed keys and addresses. If the
// address is a P2PKH address, the associated pubkey is looked up by the wallet
// if possible, otherwise an error is returned for a missing pubkey.
//
// This function only works with secp256k1 pubkeys and P2PKH addresses derived
// from them.
func (w *Wallet) MakeSecp256k1MultiSigScript(secp256k1Addrs []dcrutil.Address, nRequired int) ([]byte, error) {
secp256k1PubKeys := make([]*dcrutil.AddressSecpPubKey, len(secp256k1Addrs))
var dbtx walletdb.ReadTx
var addrmgrNs walletdb.ReadBucket
defer func() {
if dbtx != nil {
dbtx.Rollback()
}
}()
// The address list will made up either of addreseses (pubkey hash), for
// which we need to look up the keys in wallet, straight pubkeys, or a
// mixture of the two.
for i, addr := range secp256k1Addrs {
switch addr := addr.(type) {
default:
return nil, errors.New("cannot make multisig script for " +
"a non-secp256k1 public key or P2PKH address")
case *dcrutil.AddressSecpPubKey:
secp256k1PubKeys[i] = addr
case *dcrutil.AddressPubKeyHash:
if addr.DSA(w.chainParams) != chainec.ECTypeSecp256k1 {
return nil, errors.New("cannot make multisig " +
"script for a non-secp256k1 P2PKH address")
}
if dbtx == nil {
var err error
dbtx, err = w.db.BeginReadTx()
if err != nil {
return nil, err
}
addrmgrNs = dbtx.ReadBucket(waddrmgrNamespaceKey)
}
addrInfo, err := w.Manager.Address(addrmgrNs, addr)
if err != nil {
return nil, err
}
serializedPubKey := addrInfo.(waddrmgr.ManagedPubKeyAddress).
PubKey().Serialize()
pubKeyAddr, err := dcrutil.NewAddressSecpPubKey(
serializedPubKey, w.chainParams)
if err != nil {
return nil, err
}
secp256k1PubKeys[i] = pubKeyAddr
}
}
return txscript.MultiSigScript(secp256k1PubKeys, nRequired)
}
