HKDF and PRF traits backed by wolfcrypt #16
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Working on the integration, will need to make the hmac module generic to provide the type of hash-mac combination that is being used before calling the PRF function (so that it supports 256 and 384).
Replace separate SHA HMAC modules with unified enum-based solution for improved maintainability and type safety. Completed wolfcrypt PRF (Pseudo random function) backed implementation.
- HKDF module, with unit tests; - Extended 'new', 'hash_type' and 'hash_len' to the HMAC module, used when creating the HMAC object in the hkdf module.
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Added a new HKDF and PRF implementation using HMAC for both SHA-256 and SHA-384 (with associated unit tests).
Consolidated SHA-256 and SHA-384 HMAC implementations into a single WCShaHmac enum, simplifying the code and removing redundant implementations.
Note: Will rebase once #13 is merged.