[gnutls-devel] GnuTLS | nettle: port upstream hardening of EC point multiplication [3.6.x] (!1407)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1407

Project:Branches: dueno/gnutls:wip/dueno/ecdsa-verify-3.6.x to gnutls/gnutls:gnutls_3_6_x
Author:    Daiki Ueno




Some internal functions used in point multiplications are known to
misbehave if the scaler is out-of-range.  This performs canonical
reduction on scalers, before point multiplication.

This ports the fixes from Nettle upstream to the bundled EC code.
See the Nettle 3.7.2 release announcement for details:
https://lists.lysator.liu.se/pipermail/nettle-bugs/2021/009458.html

## 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)
 * [ ] 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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