func (kp *Full) SignDecorated(input []byte) (xdr.DecoratedSignature, error) {
sig, err := kp.Sign(input)
if err != nil {
return xdr.DecoratedSignature{}, err
}
return xdr.DecoratedSignature{
Hint: xdr.SignatureHint(kp.Hint()),
Signature: xdr.Signature(sig),
}, nil
}
// 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.Signature(sig[:]),
}
txe.Signatures = append(txe.Signatures, ds)
return nil
}
func (kp *Full) Sign(input []byte) ([]byte, error) {
_, priv := kp.keys()
return xdr.Signature(ed25519.Sign(priv, input)[:]), nil
}
// 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("SA26PHIKZM6CXDGR472SSGUQQRYXM6S437ZNHZGRM6QA4FOPLLLFRGDX")
if err != nil {
panic(err)
}
dpub, _, err := GenerateKeyFromSeed("SBQHO2IMYKXAYJFCWGXC7YKLJD2EGDPSK3IUDHVJ6OOTTKLSCK6Z6POM")
if err != nil {
panic(err)
}
asset, err := xdr.NewAsset(xdr.AssetTypeAssetTypeNative, nil)
if err != nil {
panic(err)
}
destination, err := AddressToAccountId(dpub.Address())
if err != nil {
panic(err)
}
op := xdr.PaymentOp{
Destination: destination,
Asset: asset,
Amount: 50 * 10000000,
}
memo, err := xdr.NewMemo(xdr.MemoTypeMemoNone, nil)
source, err := AddressToAccountId(spub.Address())
if err != nil {
panic(err)
}
body, err := xdr.NewOperationBody(xdr.OperationTypePayment, op)
if err != nil {
panic(err)
}
tx := xdr.Transaction{
SourceAccount: source,
Fee: 10,
SeqNum: xdr.SequenceNumber(1),
Memo: memo,
Operations: []xdr.Operation{
{Body: body},
},
}
var txBytes bytes.Buffer
_, err = xdr.Marshal(&txBytes, tx)
if err != nil {
panic(err)
}
txHash := Hash(txBytes.Bytes())
signature := spriv.Sign(txHash[:])
ds := xdr.DecoratedSignature{
Hint: spriv.Hint(),
Signature: xdr.Signature(signature[:]),
}
txe := xdr.TransactionEnvelope{
Tx: tx,
Signatures: []xdr.DecoratedSignature{ds},
}
var txeBytes bytes.Buffer
_, err = xdr.Marshal(&txeBytes, txe)
if err != nil {
panic(err)
}
txeB64 := base64.StdEncoding.EncodeToString(txeBytes.Bytes())
fmt.Printf("tx base64: %s", txeB64)
// Output: tx base64: AAAAAAU08yUQ8sHqhY8j9mXWwERfHC/3cKFSe/spAr0rGtO2AAAACgAAAAAAAAABAAAAAAAAAAAAAAABAAAAAAAAAAEAAAAA+fnTe7/v4whpBUx96oj92jfZPz7S00l3O2xeyeqWIA0AAAAAAAAAAB3NZQAAAAAAAAAAATXnnQoAAABAieruUIGcQH6RlQ+prYflPFU3nED2NvWhtaC+tgnKsqgiKURK4xo/W7EgH0+I6aQok52awbE+ksOxEQ5MLJ9eAw==
}