Authentication Web Services for Java applications

Hi All,
We are building Java based SAP applications for mobile devices such as Blackberry, iPhone etc. The applications are browser based (thin client) to be deployed on SAP Netweaver WAS and would interface with SAP backends such as SAP ECC, SAP BW using SAP Web Services (converted from BAPIs).
For certain reasons we do not want to use Mobile Webdynpro Java using JCO/BAPIs as we would be using a Java based middleware which is built in-house for rendering on multiple devices and it does not go well with Mobile Webdynpro with Java. We are NOT using SAP Enterprise Portal as well.
What I would like to know is are there any standard Authentication Web Services that can be used to authenticate the user, when he tries to login to the application through the mobile browser. Also does SAP Netweaver WAS provide authentication mechanism for a Java based web application by default.
Any pointers would be appreciated and thanks in advance for the same.
Suresh

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