[gnutls-devel] GnuTLS | Draft: gnutls_privkey_derive_secret: new function (!1773)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1773

Project:Branches: dueno/gnutls:wip/dueno/ecdh-api to gnutls/gnutls:master
Author:   Daiki Ueno




This adds a new function gnutls_privkey_derive_secret, which can be
used in conjunction with the other key import or key generation API to
calculate shared secret.

Key import could be done with gnutls_{pubkey,privkey}_import_ecc_raw
for ECDH and gnutls_{pubkey,privkey}_import_dsa_raw for FFDH, while
key generation could be done with gnutls_{pubkey,privkey}_generate2
with respective algorithms (e.g., GNUTLS_PK_ECDH_X25519).

## 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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