tls13_ctx_new
struct tls13_ctx *tls13_ctx_new(int mode, SSL *ssl);
if ((ctx = tls13_ctx_new(TLS13_HS_SERVER, ssl)) == NULL) {
if ((ctx = tls13_ctx_new(TLS13_HS_CLIENT, ssl)) == NULL) {
if ((tls13_ctx = tls13_ctx_new(TLS13_HS_CLIENT, ssl)) == NULL) {