getEncoded method

@override Uint8List getEncoded([ bool compressed = true ])

return the field element encoded with point compression. (S 4.3.6)

Implementation

@override
Uint8List getEncoded([bool compressed = true]) {
  if (isInfinity) {
    return Uint8List.fromList([1]);
  }

  var qLength = x!.byteLength;
  if (compressed) {
    int pc;

    if (_testBit(y!.toBigInteger()!, 0)) {
      pc = 0x03;
    } else {
      pc = 0x02;
    }

    var X = _x9IntegerToBytes(x!.toBigInteger(), qLength);
    var po = Uint8List(X.length + 1);

    po[0] = pc.toInt();
    po.setAll(1, X);

    return po;
  } else {
    var X = _x9IntegerToBytes(x!.toBigInteger(), qLength);
    var Y = _x9IntegerToBytes(y!.toBigInteger(), qLength);
    var po = Uint8List(X.length + Y.length + 1);

    po[0] = 0x04;
    po.setAll(1, X);
    po.setAll(X.length + 1, Y);

    return po;
  }
}