[gnutls-devel] GnuTLS | Serialise `gnutls_session_t session` (#1712)

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Alistair Francis created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1712



As part of supporting KeyUpdate with ktls-utils/tlshd and the Linux kernel TLS implementation we need a way to save and restore the `gnutls_session_t session`. The idea is to convert the `gnutls_session_t session` to an simple byte array, save that in the kernel keyring and then restore it when required.

The existing `gnutls_session_set_data()`/`gnutls_session_get_data()` functions don't save and restore enough state to just call `gnutls_session_key_update()` on the restored session without any other handshake.

So the question is, is there a way to serialise the session data and if not is that something I could implement and would be accepted upstream?

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