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Refine the comment about generating early secrects in post server hello

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Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
This commit is contained in:
Xiaokang Qian 2023-02-02 06:05:48 +00:00
parent bd0ab06d50
commit 7892b6caad
1 changed files with 7 additions and 4 deletions
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11
library/ssl_tls13_client.c
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@ -1935,11 +1935,14 @@ static int ssl_tls13_postprocess_server_hello(mbedtls_ssl_context *ssl)
("Selected key exchange mode: %s",
ssl_tls13_get_kex_mode_str(handshake->key_exchange_mode)));
/* Start the TLS 1.3 key schedule: Set the PSK and derive early secret.
/* Start the TLS 1.3 key scheduling if not already done.
*
* We do this in case we didn't offer 0-RTT or even we offered 0-RTT but
* server selected ephemeral mode. In other cases, we could skip generating
* the early secret.
* If we proposed early data then we have already derived an
* early secret using the selected PSK and its associated hash.
* It means that if the negotiated key exchange mode is psk or
* psk_ephemeral, we have already correctly computed the
* early secret and thus we do not do it again. In all other
* cases we compute it here.
*/
#if defined(MBEDTLS_SSL_EARLY_DATA)
if ((ssl->early_data_status == MBEDTLS_SSL_EARLY_DATA_STATUS_NOT_SENT) ||