if (!resp.getSelectedDialect().atLeast(DialectVersion.SMB311)) {
            throw new SmbUnsupportedOperationException();
        }

        MessageDigest dgst = switch (resp.getSelectedPreauthHash()) {
        case 1 -> Crypto.getSHA512();
        default -> throw new SmbUnsupportedOperationException();
        };
        if (oldHash != null) {
            dgst.update(oldHash);
        }