serialize method
Interface for output serialization.
Implementation
@override
void serialize(SerializableOutput output) {
serializeString(output, formatId);
Uint8List blob = Uint8List(4 * 2 + mpIntLength(r) + mpIntLength(s));
SerializableOutput blobOutput = SerializableOutput(blob);
serializeMpInt(blobOutput, r);
serializeMpInt(blobOutput, s);
if (!blobOutput.done) throw FormatException('${blobOutput.offset}');
serializeString(output, blob);
}