From c5a4cfaebeb32ce10e5e67cdf189c3c8e7103e89 Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Thu, 10 Oct 2019 18:22:06 +0300
Subject: [PATCH] smartcontract: add CreateSignatureRedeemScript()

It's very similar to the CreateMultiSigRedeemScript() and it will be used in
interop functions.
---
 pkg/smartcontract/contract.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/pkg/smartcontract/contract.go b/pkg/smartcontract/contract.go
index 7e978bfd3..095f9f8e9 100644
--- a/pkg/smartcontract/contract.go
+++ b/pkg/smartcontract/contract.go
@@ -9,6 +9,21 @@ import (
 	"github.com/CityOfZion/neo-go/pkg/vm"
 )
 
+// CreateSignatureRedeemScript creates a check signature script runnable by VM.
+func CreateSignatureRedeemScript(key *keys.PublicKey) ([]byte, error) {
+	buf := new(bytes.Buffer)
+	err := vm.EmitBytes(buf, key.Bytes())
+	if err != nil {
+		return nil, err
+	}
+	err = vm.EmitOpcode(buf, vm.CHECKSIG)
+	if err != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
 // CreateMultiSigRedeemScript will create a script runnable by the VM.
 func CreateMultiSigRedeemScript(m int, publicKeys keys.PublicKeys) ([]byte, error) {
 	if m <= 1 {