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Generate early key and switch outbound key to it after write client hello

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Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
This commit is contained in:
Xiaokang Qian 2022-12-15 14:42:45 +00:00
parent d05ac5dfce
commit df6f52e2b2
1 changed files with 46 additions and 1 deletions
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45
library/ssl_client.c
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@ -893,6 +893,7 @@ static int ssl_prepare_client_hello(mbedtls_ssl_context *ssl)
return 0;
}
/*
* Write ClientHello handshake message.
* Handler for MBEDTLS_SSL_CLIENT_HELLO
@ -962,8 +963,52 @@ int mbedtls_ssl_write_client_hello(mbedtls_ssl_context *ssl)
buf_len,
msg_len));
mbedtls_ssl_handshake_set_state(ssl, MBEDTLS_SSL_SERVER_HELLO);
#if defined(MBEDTLS_SSL_EARLY_DATA)
if (ssl->early_data_status == MBEDTLS_SSL_EARLY_DATA_STATUS_REJECTED) {
psa_algorithm_t hash_alg = PSA_ALG_NONE;
const unsigned char *psk;
size_t psk_len;
MBEDTLS_SSL_DEBUG_MSG(1, ("in generate early keys"));
if ((ret = mbedtls_ssl_tls13_ticket_get_psk(
ssl, &hash_alg, &psk, &psk_len))
!= 0) {
MBEDTLS_SSL_DEBUG_RET(
1, "mbedtls_ssl_tls13_ticket_get_psk", ret);
goto cleanup;
}
if ((ret = mbedtls_ssl_set_hs_psk(ssl, psk, psk_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_set_hs_psk", ret);
goto cleanup;
}
/* Start the TLS 1.3 key schedule:
* Set the PSK and derive early secret.
*/
ret = mbedtls_ssl_tls13_key_schedule_stage_early(ssl);
if (ret != 0) {
MBEDTLS_SSL_DEBUG_RET(1,
"mbedtls_ssl_tls13_key_schedule_stage_early", ret);
goto cleanup;
}
/* Derive early data key material */
ret = mbedtls_ssl_tls13_compute_early_transform(ssl);
if (ret != 0) {
MBEDTLS_SSL_DEBUG_RET(1,
"mbedtls_ssl_tls13_compute_early_transform", ret);
goto cleanup;
}
MBEDTLS_SSL_DEBUG_MSG(
1, ("Switch to early data keys for outbound traffic"));
mbedtls_ssl_set_outbound_transform(
ssl, ssl->handshake->transform_earlydata);
}
#endif /* MBEDTLS_SSL_EARLY_DATA */
}
cleanup: