rsaenh: HMAC cleanup

[Michael Jung]

I moved stuff relevant to HMAC hash initialization and finalization from 
CPSetHashParam and CPGetHashParam to init_hash and finalize_hash. It's 
cleaner conceptually and I need it to implement SSL/TLS pseudo random 
functions efficiently.

Changelog:
 Moved HMAC initialization and finalization code to init_/finalize_hash
 Removed the redundant pKeyContainer function parameter from init_hash

-- 
Michael Jung
mjung at iss.tu-darmstadt.de
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