[gnutls-devel] GnuTLS | pkcs11: fix key pair generation for EdDSA (!1778)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1778

Project:Branches: dueno/gnutls:wip/dueno/edwards-keygen to gnutls/gnutls:master
Author:   Daiki Ueno




Previouly we used the CKM_EDDSA mechanism to generate key pair, though
the mechanism can only be used for signing and verification as
specified in PKCS#11 3.1 section 6.3.  For key generation, the
CKM_EC_EDWARDS_KEY_PAIR_GEN mechanism (or
CKM_EC_MONTGOMERY_KEY_PAIR_GEN, if the point is represented in the
Montgomery form) needs to be used.

Fixes: #1309 

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [x] 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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