if (!this.smb2 || this.negotiated == null) {
            throw new SmbUnsupportedOperationException();
        }

        final Smb2NegotiateResponse resp = (Smb2NegotiateResponse) this.negotiated;
        if (!resp.getSelectedDialect().atLeast(DialectVersion.SMB311)) {
            throw new SmbUnsupportedOperationException();
        }

        MessageDigest dgst = switch (resp.getSelectedPreauthHash()) {