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share write_early_data_ext function

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Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
This commit is contained in:
Jerry Yu
2023-11-23 18:06:06 +08:00
parent 0069abc141
commit 5233539d9f
4 changed files with 35 additions and 54 deletions
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34
library/ssl_tls13_generic.c
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@ -1402,28 +1402,48 @@ cleanup:
*
* struct {
* select ( Handshake.msg_type ) {
* ...
* case new_session_ticket: uint32 max_early_data_size;
* case client_hello: Empty;
* case encrypted_extensions: Empty;
* };
* } EarlyDataIndication;
*
* We use `mbedtls_ssl_is_handshake_over()` to decide if `max_early_data_size`
* should be sent for `new_session_ticket` is post-handshake message.
*/
#if defined(MBEDTLS_SSL_EARLY_DATA)
int mbedtls_ssl_tls13_write_early_data_ext(mbedtls_ssl_context *ssl,
unsigned char *buf,
const unsigned char *end,
size_t *out_len)
size_t *out_len,
const mbedtls_ssl_session *session)
{
unsigned char *p = buf;
*out_len = 0;
((void) ssl);
MBEDTLS_SSL_CHK_BUF_PTR(p, end, 4);
#if defined(MBEDTLS_SSL_SRV_C)
const size_t needed = session != NULL ? 8 : 4;
#else
const size_t needed = 4;
((void) session);
#endif
*out_len = 0;
MBEDTLS_SSL_CHK_BUF_PTR(p, end, needed);
MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_EARLY_DATA, p, 0);
MBEDTLS_PUT_UINT16_BE(0, p, 2);
MBEDTLS_PUT_UINT16_BE(needed - 4, p, 2);
*out_len = 4;
#if defined(MBEDTLS_SSL_SRV_C)
if (session != NULL) {
MBEDTLS_PUT_UINT32_BE(session->max_early_data_size, p, 4);
MBEDTLS_SSL_DEBUG_MSG(
4, ("Sent max_early_data_size=%u",
(unsigned int) session->max_early_data_size));
}
#endif
*out_len = needed;
mbedtls_ssl_tls13_set_hs_sent_ext_mask(ssl, MBEDTLS_TLS_EXT_EARLY_DATA);