// SignatureScriptAlt creates an input signature script for tx to spend coins sent
// from a previous output to the owner of privKey. tx must include all
// transaction inputs and outputs, however txin scripts are allowed to be filled
// or empty. The returned script is calculated to be used as the idx'th txin
// sigscript for tx. subscript is the PkScript of the previous output being used
// as the idx'th input. privKey is serialized in the respective format for the
// ECDSA type. This format must match the same format used to generate the payment
// address, or the script validation will fail.
func SignatureScriptAlt(tx *wire.MsgTx, idx int, subscript []byte,
hashType SigHashType, privKey chainec.PrivateKey, compress bool,
sigType int) ([]byte,
error) {
sig, err := RawTxInSignatureAlt(tx, idx, subscript, hashType, privKey,
sigTypes(sigType))
if err != nil {
return nil, err
}
pubx, puby := privKey.Public()
var pub chainec.PublicKey
switch sigTypes(sigType) {
case edwards:
pub = chainec.Edwards.NewPublicKey(pubx, puby)
case secSchnorr:
pub = chainec.SecSchnorr.NewPublicKey(pubx, puby)
}
pkData := pub.Serialize()
return NewScriptBuilder().AddData(sig).AddData(pkData).Script()
}
