* @param passwordHashHex
     *            NT password hash, hex encoded
     */
    public NtlmNtHashAuthenticator(final String domain, final String username, final String passwordHashHex) {
        this(domain, username, Hex.decode(passwordHashHex));
    }

    private NtlmNtHashAuthenticator(final byte[] passwordHash) {
        this.ntHash = passwordHash;
    }

    /**
     * {@inheritDoc}
     *