From aa21a0e6dff0e4cd19ae409fcf6a63b14a2189e5 Mon Sep 17 00:00:00 2001
From: David Garske <david@wolfssl.com>
Date: Fri, 8 Feb 2019 17:36:40 -0800
Subject: [PATCH] Fix to increase maximum DH key size if using fast math and
 FP_MAX_BITS supports it.

---
 wolfssl/internal.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/wolfssl/internal.h b/wolfssl/internal.h
index 182c345fd..3c51afc22 100644
--- a/wolfssl/internal.h
+++ b/wolfssl/internal.h
@@ -1110,7 +1110,11 @@ enum {
 #define MIN_DHKEY_SZ (WOLFSSL_MIN_DHKEY_BITS / 8)
 /* set maximum DH key size allowed */
 #ifndef WOLFSSL_MAX_DHKEY_BITS
-    #define WOLFSSL_MAX_DHKEY_BITS 4096
+    #if (defined(USE_FAST_MATH) && defined(FP_MAX_BITS) && FP_MAX_BITS >= 16384)
+        #define WOLFSSL_MAX_DHKEY_BITS 8192
+    #else
+        #define WOLFSSL_MAX_DHKEY_BITS 4096
+    #endif
 #endif
 #if (WOLFSSL_MAX_DHKEY_BITS % 8)
     #error DH maximum bit size must be multiple of 8