[gnutls-devel] GnuTLS | certtool: reject negative serial numbers (!1739)

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Elias Gustafsson created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1739

Project:Branches: Eligus/gnutls:certtool-negative-serial to gnutls/gnutls:master
Author:   Elias Gustafsson




According to RFC 5280 section 4.1.2.2, certificate serial numbers must be positive integers, so `certtool` should reject hexadecimal serial numbers that would be interpreted as negative numbers. This patch adds checks that reject all serial numbers with the high bit set to 1.

Fixes #1237

## 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
 * [x] 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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