[gnutls-devel] GnuTLS | tls13/key_update: Expose a manual KeyUpdate function (!1965)

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Tue May 27 14:36:26 CEST 2025




Daiki Ueno commented: https://gitlab.com/gnutls/gnutls/-/merge_requests/1965#note_2527659895


@alistair23 thank you for the patch. If I understand correctly, this looks like a valid use-case: you are driving a TLS handshake and need an API to emulate the behavior where the GnuTLS receives a KeyUpdate message from the peer; this is not easily possible as the message need to be encrypted with an old key.

I need a closer look, but so far I would suggest naming it with the `gnutls_handshake_` prefix, like other manually triggered handshake functions such as `gnutls_handshake_write`, etc.

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