[gnutls-devel] GnuTLS | x509: encode ECDSA private key in fixed length (!2030)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2030

Project:Branches: dueno/gnutls:wip/dueno/ecc-privkey to gnutls/gnutls:master
Author:   Daiki Ueno



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

* x509: encode ECDSA private key in fixed length

RFC 5915 section 3 says that the privateKey field of ECPrivateKey
structure should be fixed length, though the library encoded it in
variable length, depending on the leading byte. This patch enforces
that the field is always encoded in fixed length, as well as
consolidates the code paths for EdDSA and X25519/X448 keys.

Fixes: #1747

## 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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