[gnutls-devel] GnuTLS | Optimize FIPS power-on self-tests: stop running unnecessary tests (!2011)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2011

Project:Branches: dueno/gnutls:wip/dueno/post-optimize2 to gnutls/gnutls:master
Author:   Daiki Ueno




<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

This is extracted from !1907, with obvious changes to avoid running unnecessary tests at startup.

* crypto-selftests-pk: skip negative tests by default

* fips: skip compat API tests in AES self-tests

* fips: only run the first test vector for each symmetric algorithm

FIPS 140-3 doesn't require to run multiple test vectors for a single
algorithm, and one of the test vector for PBKDF2, with an 80000
iteration count is known to be too costly.  Therefore, this patch
changes gnutls_*_self_test to pick only the first test from the test
vectors, unless GNUTLS_SELF_TEST_FLAG_ALL is specified.  The existing
test vectors have been reviewed and modified for the first element to
use the sane parameters, namely: aes128_gcm_vectors to use non-zero
key and non-empty AAD, aes256_gcm_vectors to use non-empty AAD, and
pbkdf2_sha256_vectors to use iteration count greater than 1.

* fips: run AES-256 self-tests with only a single mode

Previously we ran FIPS power-on self-tests for AES-256-CBC,
AES-256-GCM, AES-256-XTS, and AES-256-CFB8, though only one mode per
key size suffices according to FIPS 140-3 IG. This omits AES-256-CBC,
AES-256-XTS, and AES-256-CFB8, keeping AES-256-GCM for performance.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## 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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