}
    }

    /**
     * @return the sessionKey
     * @throws CIFSException
     */
    @Override
    public byte[] getSessionKey() throws CIFSException {
        if (this.sessionKey == null) {
            throw new CIFSException("No session key available");
        }
        return this.sessionKey;
    }

    @Override

     * @param preauthHash the pre-authentication integrity hash (SMB 3.1.1 only)
     * @return encryption context
     * @throws CIFSException if encryption is not supported or fails
     */
    Smb2EncryptionContext createEncryptionContext(final byte[] sessionKey, final byte[] preauthHash) throws CIFSException {
        if (!this.smb2 || this.negotiated == null) {