Refactored RSA getters
Refactored RSA getters

The getters are modified to use cached RSA parameters instead
of retrieving them every time from the PKCS#11 module.

OpenSC/libp11,dengert/libp11,nmav/libp11,mouse07410/libp11,dengert/libp11,mtrojnar/libp11,OpenSC/libp11,mtrojnar/libp11,mouse07410/libp11,nmav/libp11