Add accessor (getter/setter) function for mbedtls_ecp_keypair

[priyamourya25]

Suggested enhancement

Please add getter setter functions for members of struct mbedtls_ecp_keypair which are private now.

Justification

These can be used to pass the group using mbedtls_ecp_group_load() API. Because members like "grp" are private, it can not be passed to load API without enabling private access.

Mbed TLS needs this because we can then use the load API with the group in mbedtls_ecp_keypair.

[gilles-peskine-arm]

We would prefer not to make the fields public, because that prevents us from improving support for platforms that have an ECC accelerator. We do recognize that the current API has gaps, however: we were planning improvements shortly after the 3.0 release, but they dropped off the radar.

We now hope to get #7815 into the next release of Mbed TLS (3.6). Would that work for you? If not, could you please describe more precisely what you want to do with mbedtls_ecp_keypair object? Basically what you can do with MBEDTLS_PRIVATE but want to do without.

[minosgalanakis]

Closing as a duplicate of #4838. ecp_export link can be used to extract the required fields.

Should that no be sufficient, please follow-up and comment on the actively workeed design issue #5017 dealing with the subject.