NTLM Authentication, Part Server / Domain Controller

Dear members,

in the document http://msdn.microsoft.com/en-us/library/aa378749.aspx# is
described how the NTLM authentication

works. We have our own client (written in java) and a server with api for
autehtication. The server has all the

necessary data for authentication (see below).

The question: how to send

* User name
* Challenge sent to the client
* Response received from the client

to the domain controller ? Is there any libraries (perhaps in java) or is
there a description how to build the

request (http ?).

Thanks in advance,

Michel