[gnutls-devel] GnuTLS | Support specifying groups to send in key_share extension (#1710)

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Alicja Kario (@mention me if you need reply) created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1710



When using `gnutls-3.8.9-9.el10`, with crypto-policies including both PQC and classical crypto key exchange groups (e.g. `GROUP-X25519-MLKEM768:GROUP-SECP256R1-MLKEM768:GROUP-SECP384R1-MLKEM1024:GROUP-X25519:GROUP-SECP256R1`) then gnutls will send key shares for the `X25519-MLKEM768` and `SECP256R1` groups.

There is no way to override the behaviour (either to send multiple PQC key_shares, or to send the X25519 key share instead of the `SECP256R1` one).

Please add a configuration mechanism that allows the user to specify which groups should be included in key_share extension.

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