From 2ac0ac8776140ea27300af0abefd8f03d8de1418 Mon Sep 17 00:00:00 2001
From: Sean Parkinson <sean@wolfssl.com>
Date: Mon, 25 Nov 2019 09:14:14 +1000
Subject: [PATCH] Fix for sp_div when a > d but same bit length

---
 wolfcrypt/src/sp_int.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/wolfcrypt/src/sp_int.c b/wolfcrypt/src/sp_int.c
index d384375b2..137f75f16 100644
--- a/wolfcrypt/src/sp_int.c
+++ b/wolfcrypt/src/sp_int.c
@@ -672,6 +672,14 @@ static int sp_div(sp_int* a, sp_int* d, sp_int* r, sp_int* rem)
         }
         done = 1;
     }
+    else if (sp_count_bits(a) == sp_count_bits(d)) {
+        /* a is greater than d but same bit length */
+        sp_sub(a, d, rem);
+        if (r != NULL) {
+            sp_set(r, 1);
+        }
+        done = 1;
+    }
 
 #ifdef WOLFSSL_SMALL_STACK
     if (!done && err == MP_OKAY) {