[gnutls-devel] GnuTLS | crypto-api: add generic crypto functions for KDF (!1186)

[Development of GNU's TLS library]

Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1186

Branches: tmp-kdf-api to master
Author:    Daiki Ueno



This exposes HKDF and PBKDF2 functions from the library.  Instead of defining a single KDF interface as in PKCS #11, this patch defines 3 distinct functions for HKDF-Extract, HKDF-Expand, and PBKDF2 derivation, so that we can take advantage of compile time checking of necesssary parameters.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [x] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [x] Documentation updated / NEWS entry present (for non-trivial changes)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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