From 8b2c0f7cd2b485ed3937f5708e8db7c0fb956fa5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tobias=20Frauenschl=C3=A4ger?= <tobias@wolfssl.com>
Date: Wed, 1 Apr 2026 09:16:55 +0200
Subject: [PATCH] Make sure ASCON is unusable on big endian

---
 wolfcrypt/src/ascon.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/wolfcrypt/src/ascon.c b/wolfcrypt/src/ascon.c
index 8c61f00bf0..8bd1e88d4d 100644
--- a/wolfcrypt/src/ascon.c
+++ b/wolfcrypt/src/ascon.c
@@ -45,6 +45,9 @@
 #ifndef WORD64_AVAILABLE
     #error "Ascon implementation requires a 64-bit word"
 #endif
+#ifdef BIG_ENDIAN_ORDER
+    #error "Ascon not yet supported on big-endian systems"
+#endif
 
 /* Data block size in bytes */
 #define ASCON_HASH256_RATE                              8