tls13: cli: Add mbedtls_ssl_write_early_data() API
Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index c2e64c6..f3bb323 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -6058,6 +6058,81 @@
return ret;
}
+#if defined(MBEDTLS_SSL_EARLY_DATA) && defined(MBEDTLS_SSL_CLI_C)
+int mbedtls_ssl_write_early_data(mbedtls_ssl_context *ssl,
+ const unsigned char *buf, size_t len)
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ const struct mbedtls_ssl_config *conf;
+ int written_data_len = 0;
+
+ MBEDTLS_SSL_DEBUG_MSG(2, ("=> write early_data"));
+
+ if (ssl == NULL || (conf = ssl->conf) == NULL) {
+ return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
+ }
+
+ if ((!mbedtls_ssl_conf_is_tls13_enabled(conf)) ||
+ (conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) ||
+ (conf->early_data_enabled != MBEDTLS_SSL_EARLY_DATA_ENABLED)) {
+ return MBEDTLS_ERR_SSL_CANNOT_WRITE_EARLY_DATA;
+ }
+
+ if (ssl->tls_version != MBEDTLS_SSL_VERSION_TLS1_3) {
+ return MBEDTLS_ERR_SSL_CANNOT_WRITE_EARLY_DATA;
+ }
+
+ /*
+ * If we are at the beginning of the handshake, advance the handshake just
+ * enough to be able to send early data if possible. That way, we can
+ * guarantee that when starting the handshake with this function we will
+ * send at least one record of early data.
+ * Otherwise, resume the handshake and if the handshake sequence stops
+ * waiting for some message from the server, send early data if we can.
+ */
+
+ if ((ssl->early_data_status == MBEDTLS_SSL_EARLY_DATA_STATUS_UNKNOWN) ||
+ (ssl->early_data_status == MBEDTLS_SSL_EARLY_DATA_STATUS_SENT)) {
+ while ((ssl->early_data_status == MBEDTLS_SSL_EARLY_DATA_STATUS_UNKNOWN) ||
+ (ssl->early_data_status == MBEDTLS_SSL_EARLY_DATA_STATUS_SENT)) {
+ ret = mbedtls_ssl_handshake_step(ssl);
+ if (ret != 0) {
+ MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_handshake_step", ret);
+ return ret;
+ }
+
+ ret = mbedtls_ssl_flush_output(ssl);
+ if (ret != 0) {
+ MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_flush_output", ret);
+ return ret;
+ }
+ }
+ } else {
+ if ((ssl->early_data_status != MBEDTLS_SSL_EARLY_DATA_STATUS_CAN_WRITE) &&
+ (ssl->early_data_status != MBEDTLS_SSL_EARLY_DATA_STATUS_ACCEPTED)) {
+ return MBEDTLS_ERR_SSL_CANNOT_WRITE_EARLY_DATA;
+ }
+
+ ret = mbedtls_ssl_handshake(ssl);
+ if ((ret != 0) && (ret != MBEDTLS_ERR_SSL_WANT_READ)) {
+ MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_handshake", ret);
+ return ret;
+ }
+ }
+
+ if ((ssl->early_data_status != MBEDTLS_SSL_EARLY_DATA_STATUS_CAN_WRITE) &&
+ (ssl->early_data_status != MBEDTLS_SSL_EARLY_DATA_STATUS_ACCEPTED)) {
+ return MBEDTLS_ERR_SSL_CANNOT_WRITE_EARLY_DATA;
+ }
+
+ written_data_len = ssl_write_real(ssl, buf, len);
+
+ MBEDTLS_SSL_DEBUG_MSG(2, ("<= write early_data, len=%d", written_data_len));
+
+ return written_data_len;
+}
+#endif /* MBEDTLS_SSL_EARLY_DATA && MBEDTLS_SSL_CLI_C */
+
/*
* Notify the peer that the connection is being closed
*/