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Add and update documentation of some minor version fields

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2022-03-31 15:37:44 +02:00
parent 82c785fac3
commit bdb4f58cea
2 changed files with 41 additions and 10 deletions
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19
library/ssl_misc.h
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@ -540,7 +540,24 @@ struct mbedtls_ssl_handshake_params
uint8_t cli_exts; /*!< client extension presence*/
#if defined(MBEDTLS_SSL_CLI_C)
/*!< Minimum minor version to be negotiated. */
/*!< Minimum minor version to be negotiated.
*
* It is set up in the ClientHello writing preparation stage and used
* throughout the ClientHello writing. Not relevant anymore as soon as
* the protocol version has been negotiated thus as soon as the
* ServerHello is received.
* For a fresh handshake not linked to any previous handshake, it is
* equal to the configured minimum minor version to be negotiated. When
* renegotiating or resuming a session, it is equal to the previously
* negotiated minor version.
*
* There is no maximum minor version field in this handshake context.
* From the start of the handshake, we need to define a current protocol
* version for the record layer which we define as the maximum minor
* version to be negotiated. The `minor_ver` field of the SSL context is
* used to store this maximum value until it contains the actual
* negotiated value.
*/
unsigned char min_minor_ver;
#endif