Hello Amrita,
Mobile SSO for the SAP Fiori using the SAP Single Sign-On product (license required) includes:
1) SAP Authenticator
2) SAML Identity Provider
3) SSO AUTHENTICATION LIBRARY 2.0
The SAP Authenticator itself is available for free but could be used for free only as a client for RFC 6238 passcodes generation solution. The server side for the two-factor authentication with OTP (one-time passwords) and also the Mobile SSO support via the SAP Authentication application requires license for the SAP Single Sign-On product.
Regards,
Donka Dimitrova