From 5cbb9e8341892e82bdf2b96a0138ca97b6e53c63 Mon Sep 17 00:00:00 2001
From: Eric Blankenhorn <eric@wolfssl.com>
Date: Thu, 17 May 2018 08:53:21 -0500
Subject: [PATCH] wolfSSL_HMAC_Final parameter len should be optional

---
 src/ssl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ssl.c b/src/ssl.c
index 41e1aba2d..4150db2f9 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -24508,7 +24508,8 @@ int wolfSSL_HMAC_Final(WOLFSSL_HMAC_CTX* ctx, unsigned char* hash,
 
     WOLFSSL_MSG("wolfSSL_HMAC_Final");
 
-    if (ctx == NULL || hash == NULL || len == NULL) {
+	/* "len" parameter is optional. */
+    if (ctx == NULL || hash == NULL) {
         WOLFSSL_MSG("invalid parameter");
         return WOLFSSL_FAILURE;
     }