Added external function for AH payload length calculation

	external function fx_setSecurityParameters(in Sa p_sa)

	return FncRetCode;

	/* @desc    This external function calculates the payload length

	 *			of an IPv6 authentication header

	 * @param   p_authHeader Authentication Header

	 * @return  payload length in 32-bits words

	*/

	external function fx_authHeaderPayloadLength(in template AuthHeader p_authHeader) return UInt8;

}// end module LibIpv6_ExternalFunctions