Hi,
I'm not an SSO expert, but for me the best solution is to use the 'Out of the box' features provided in BIP and HANA.
So you can :
- Enable the Windows AD SSO in BI Plateform, so users can connect to BI Launchpad with their Windows ID
- Enable SAML SSO between BIP and HANA (here BIP is the identity provider). See the following post for more details :
http://scn.sap.com/community/hana-in-memory/blog/2013/08/01/configuring-saml-with-sap-hana-and-sap-businessobjects-41--part-1
Regards