tree 462bc342798d9506bc5e5f1352c22bafe74984c4
parent 59d97a16d6488c744a55f7f73fd3a202a3c1b309
author Hanno Becker <hanno.becker@arm.com> 1606200097 +0000
committer Hanno Becker <hanno.becker@arm.com> 1619846269 +0100

Introduce helper for handling of post-handshake handshake messages

Handling the receipt of a handshake record after the initial handshake
requires non-trivial logic depending on the protocol version and the
endpoint. This logic is currently embedded in mbedtls_ssl_read().

With the introduction of support for [D]TLS 1.3, the logic will become
even more complex, since [D]TLS 1.3 drops support for renegotiation --
which in [D]TLS 1.2 is the main purpose of post-handshake handshake
messages -- but instead introduces numerous other post-handshake
handshake messages.

In order to pave the way for those changes, this commit improves
readability and maintainability of mbedtls_ssl_read() by moving
the TLS <=1.2 logic for handling post-handshake handshake messages
into a separate helper function ssl_handle_hs_message_post_handshake().

The logic of the code is entirely unchanged.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>