neoneo-go/pkg/smartcontract/contract.go

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package smartcontract
import (
"bytes"
"fmt"
"sort"
"github.com/CityOfZion/neo-go/pkg/crypto/keys"
"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
}
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// CreateMultiSigRedeemScript creates a script runnable by the VM.
func CreateMultiSigRedeemScript(m int, publicKeys keys.PublicKeys) ([]byte, error) {
if m <= 1 {
return nil, fmt.Errorf("param m cannot be smaller or equal to 1 got %d", m)
}
if m > len(publicKeys) {
return nil, fmt.Errorf("length of the signatures (%d) is higher then the number of public keys", m)
}
if m > 1024 {
return nil, fmt.Errorf("public key count %d exceeds maximum of length 1024", len(publicKeys))
}
buf := new(bytes.Buffer)
if err := vm.EmitInt(buf, int64(m)); err != nil {
return nil, err
}
sort.Sort(publicKeys)
for _, pubKey := range publicKeys {
if err := vm.EmitBytes(buf, pubKey.Bytes()); err != nil {
return nil, err
}
}
if err := vm.EmitInt(buf, int64(len(publicKeys))); err != nil {
return nil, err
}
if err := vm.EmitOpcode(buf, vm.CHECKMULTISIG); err != nil {
return nil, err
}
return buf.Bytes(), nil
}