Apart from SRSS, you also need the followings to do PIN based login:
* Latest PC/SC SRCOM Bypass package (available to download from Sun download center http://www.sun.com/download/products.xml?id=42c5d3d9 )
* Middleware Software. The one that I know is, ActivIdentity's ActivClient software for Solaris.
Hope this helps
-Shivu