}
                    } else {
                        log.debug("Initialize signing");
                        byte[] signingKey = npa.getSigningKey(getContext(), negoResp.getServerData().encryptionKey);
                        if (signingKey == null) {
                            throw new SmbException("Need a signature key but the server did not provide one");
                        }

            final byte[] encryptionKey = Smb3KeyDerivation.deriveEncryptionKey(dialectInt, sessionKey, preauthHash);
            final byte[] decryptionKey = Smb3KeyDerivation.deriveDecryptionKey(dialectInt, sessionKey, preauthHash);

            // Pass session key and preauthHash to enable automatic key rotation
            return new Smb2EncryptionContext(cipherId, dialect, encryptionKey, decryptionKey, sessionKey, preauthHash);