// ExampleLowLevelTransaction creates and signs a simple transaction, and then // encodes it into a hex string capable of being submitted to stellar-core. // // It uses the low-level xdr facilities to create the transaction. func ExampleLowLevelTransaction() { spub, spriv, err := GenerateKeyFromSeed("s3Fy8h5LEcYVE8aofthKWHeJpygbntw5HgcekFw93K6XqTW4gEx") if err != nil { log.Fatal(err) } dpub, _, err := GenerateKeyFromSeed("sfkPCKA6XgaeHZH3NE57i3QrjVcw61c1noWQCgnHa6KJP2BrbXD") if err != nil { log.Fatal(err) } op := xdr.PaymentOp{ Destination: dpub.KeyData(), Currency: xdr.NewCurrencyCurrencyTypeNative(), Amount: 50 * 10000000, } tx := xdr.Transaction{ SourceAccount: spub.KeyData(), Fee: 10, SeqNum: xdr.SequenceNumber(1), Memo: xdr.NewMemoMemoNone(), Operations: []xdr.Operation{ {Body: xdr.NewOperationBodyPayment(op)}, }, } var txBytes bytes.Buffer _, err = xdr.Marshal(&txBytes, tx) if err != nil { log.Fatal(err) } txHash := Hash(txBytes.Bytes()) signature := spriv.Sign(txHash[:]) ds := xdr.DecoratedSignature{ Hint: spriv.Hint(), Signature: xdr.Uint512(signature), } txe := xdr.TransactionEnvelope{ Tx: tx, Signatures: []xdr.DecoratedSignature{ds}, } var txeBytes bytes.Buffer _, err = xdr.Marshal(&txeBytes, txe) if err != nil { log.Fatal(err) } txeHex := hex.EncodeToString(txeBytes.Bytes()) fmt.Printf("tx hex: %s", txeHex) // Output: tx hex: 3658fe7598d20c7a6de3297f84bc52bd2a1ec8c0f1f6c5b41cc1c7571b4331f00000000a000000000000000100000000000000000000000100000000000000012d24692ed08bbf679ba199448870d2191e876fecd92fdd9f6d274da4e6de134100000000000000001dcd650000000001dd302d0c0cee527cf02f6a0aec6916966298712914c63e3c57de74a6e27c29ea234a555fcc36533417afe4e1147815a42529fbca3429bc7caf0a06dc6b383ca6e9d4d80f }
// MutateTransactionEnvelope adds a signature to the provided envelope func (m Sign) MutateTransactionEnvelope(txe *xdr.TransactionEnvelope) error { tb := TransactionBuilder{TX: txe.Tx} hash, err := tb.Hash() if err != nil { return err } if m.Key == nil { return errors.New("Invalid key") } sig := m.Key.Sign(hash[:]) ds := xdr.DecoratedSignature{ Hint: m.Key.Hint(), Signature: xdr.Uint512(sig), } txe.Signatures = append(txe.Signatures, ds) return nil }