sign method

Uint8List sign(Uint8List message)

Implementation

Uint8List sign(Uint8List message) {
  final digest1 = sha512Hash(Uint8List.sublistView(bytes, 0, 32));
  final messageDigest = sha512Hash(Uint8List.fromList([
    ...Uint8List.sublistView(digest1, 32),
    ...message,
  ]));

  final z = Scalar()..setUniformBytes(messageDigest);
  final r = (Point.newIdentityPoint()..scalarBaseMult(z)).Bytes();

  final pub = _publicKey();

  final hramDigest = sha512Hash(Uint8List.fromList([
    ...r,
    ...pub,
    ...message,
  ]));

  final x = Scalar()..setUniformBytes(hramDigest);
  final y = Scalar()..setCanonicalBytes(bytes);
  final s = Scalar()..multiplyAdd(x, y, z);

  return Uint8List.fromList([
    ...r,
    ...s.Bytes(),
  ]);
}