package smartcontract import ( "fmt" "sort" "github.com/nspcc-dev/neo-go/pkg/crypto/keys" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/vm/emit" "github.com/nspcc-dev/neo-go/pkg/vm/opcode" ) // 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 := io.NewBufBinWriter() emit.Int(buf.BinWriter, int64(m)) sort.Sort(publicKeys) for _, pubKey := range publicKeys { emit.Bytes(buf.BinWriter, pubKey.Bytes()) } emit.Int(buf.BinWriter, int64(len(publicKeys))) emit.Opcode(buf.BinWriter, opcode.PUSHNULL) emit.Syscall(buf.BinWriter, "Neo.Crypto.ECDsaCheckMultiSig") return buf.Bytes(), nil }