From 4b1c89ab381861e87a2fa43809438f040782f475 Mon Sep 17 00:00:00 2001
From: Sean Parkinson <sean@wolfssl.com>
Date: Mon, 15 Feb 2021 09:04:43 +1000
Subject: [PATCH] DH SP math: return key size error with DH Agree

SP math requires SP to support DH operations.
When SP doesn't support bit size, WC_KEY_SIZE_E must be returned.
---
 wolfcrypt/src/dh.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/wolfcrypt/src/dh.c b/wolfcrypt/src/dh.c
index 0c9f18275..ebfb8683e 100644
--- a/wolfcrypt/src/dh.c
+++ b/wolfcrypt/src/dh.c
@@ -1998,6 +1998,8 @@ static int wc_DhAgree_Sync(DhKey* key, byte* agree, word32* agreeSz,
     mp_clear(z);
     mp_clear(y);
     mp_forcezero(x);
+#else
+    ret = WC_KEY_SIZE_E;
 #endif
 
 #ifdef WOLFSSL_SMALL_STACK