The DTLS 1.2 CID specification has been published as RFC 9146. This PR updates the implementation to match the RFC content.

Signed-off-by: Hannes Tschofenig <hannes.tschofenig@arm.com>

Ensure MBEDTLS_SSL_DTLS_CONNECTION_ID_COMPAT is unset where
MBEDTLS_SSL_DTLS_CONNECTION_ID is unset.

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>

Ensure MBEDTLS_SSL_DTLS_CONNECTION_ID and MBEDTLS_SSL_DTLS_CONNECTION_ID_COMPAT
are unset when MBEDTLS_SSL_PROTO_DTLS is not set in tls13-only tests.

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>

Signed-off-by: Hannes Tschofenig <hannes.tschofenig@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

Added deprecated keyword to MBEDTLS_SSL_DTLS_CONNECTION_ID_COMPAT

Signed-off-by: Hannes Tschofenig <hannes.tschofenig@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

Warns about the removal of the legacy DTLS Connection ID feature in a future version of Mbed TLS.

Signed-off-by: Hannes Tschofenig <hannes.tschofenig@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

Signed-off-by: Hannes Tschofenig <hannes.tschofenig@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

Added also extra text.

Signed-off-by: Hannes Tschofenig <hannes.tschofenig@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

Per suggestion from Manuel, I removed this redundant test.

Signed-off-by: Hannes Tschofenig <hannes.tschofenig@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

When legacy CID is enabled at compile time, but not used at runtime, we
would incorrectly skip the sequence number at the beginning of the AAD.

There was already two "else" branches for writing the sequence number
but none of them was taken in that particular case.

Simplify the structure of the code: with TLS 1.2 (we're already in that
branch), we always write the sequence number, unless we're using
standard CID.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

We don't need to have two copies of the test with one of them depending
on legacy/compat CID: we can have just one copy, but make sure we run
ssl-opt.sh both in a build with standard CID and in a build with
legacy/compat - that's the job of all.sh (see next commit).

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

CID is now enabled in the default config (as well as full), so it's
already tested in numerous all.sh components, not need to add one for
that.

We need a component for the legacy/compat option though as it's never
enabled in existing components. So, keep that one, but adjust the name
and fix a typo in a message.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>