Gilles Peskine 01126fae7f Isolate HMAC code into its own functions
Create internal functions for HMAC operations. This prepares for two
things: separating crypto-sensitive code from argument decoding and
validation, and using HMAC for other purposes than a MAC inside the
library (e.g. HMAC_DRBG, HKDF).

No intended observable behavior change in this commit.
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