public void GenerateSecret(X448PublicKeyParameters publicKey, byte[] buf, int off)
{
byte[] encoded = new byte[X448.PointSize];
publicKey.Encode(encoded, 0);
if (!X448.CalculateAgreement(data, 0, encoded, 0, buf, off))
{
throw new InvalidOperationException("X448 agreement failed");
}
}
