From dadeb20383956f6b8654fce1501ab2d572f09058 Mon Sep 17 00:00:00 2001
From: Pengyu Lv <pengyu.lv@arm.com>
Date: Wed, 18 Jan 2023 17:32:34 +0800
Subject: [PATCH] TLS 1.3: SRV: Don't select ephemeral mode on resumption

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>
---
 library/ssl_tls13_server.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index 858a7a364b..90869d6c3a 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -982,7 +982,8 @@ MBEDTLS_CHECK_RETURN_CRITICAL
 static int ssl_tls13_check_ephemeral_key_exchange(mbedtls_ssl_context *ssl)
 {
 #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED)
-    return mbedtls_ssl_conf_tls13_ephemeral_enabled(ssl) &&
+    return !ssl->handshake->resume &&
+           mbedtls_ssl_conf_tls13_ephemeral_enabled(ssl) &&
            ssl_tls13_client_hello_has_exts_for_ephemeral_key_exchange(ssl);
 #else
     ((void) ssl);