rsaenh: moved functionality from new_key to CPGenKey and CPDeriveKey

[Michael Jung]

Hi,

this is a new version of a patch I've sent before. I regenerated it for the 
current LibTomCrypt based implementation of rsaenh.

Original message:

The new_key helper function in rsaenh.c tries to do too much: Besides
allocating the memory resources needed by the key object, it generates the
actual binary key value (either derived from a hash, from a byte array or
from the random number generator). This is a waste of cpu time if the key
object will be used to import a key from a BLOB, and is especially wastefull
for RSA keys.

The attached patch moves functionality, which is specific to either CPGenKey,
CPDeriveKey or CPImportKey, from new_key into those functions.

Bye,
Michael

Changelog:
 Moved code specific to CPGenKey, CPDeriveKey or CPImportKey from new_key
 into the respective function.
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