[gnutls-devel] GnuTLS | Improve certificate sanity checks (!1583)

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Zoltán Fridrich created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1583

Project:Branches: ZoltanFridrich/gnutls:zfridric_devel to gnutls/gnutls:master
Author:   Zoltán Fridrich
Assignee: Zoltán Fridrich



This MR adds more stricter sanity checks where any certificate containing garbage bits should be prohibited. These strict sanity checks can be used by configuring gnutls with --enable-strict-x509 option.

Closes #1218 

## Checklist
 * [ ] 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)
 * [ ] 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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