From e9bbf892870c98adc57d1b037d3fc773e6a82a00 Mon Sep 17 00:00:00 2001
From: David Garske <david@wolfssl.com>
Date: Tue, 14 Jan 2020 14:13:12 -0800
Subject: [PATCH] Fix for `WOLFSSL_ECDSA_SET_K` with normal math. The sign_k
 mp_int was not initialized.

---
 wolfcrypt/src/ecc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/wolfcrypt/src/ecc.c b/wolfcrypt/src/ecc.c
index e4aec5380..aeca14cc2 100644
--- a/wolfcrypt/src/ecc.c
+++ b/wolfcrypt/src/ecc.c
@@ -5118,9 +5118,15 @@ int wc_ecc_sign_set_k(const byte* k, word32 klen, ecc_key* key)
             if (key->sign_k == NULL) {
                 ret = MEMORY_E;
             }
+            else {
+                XMEMSET(key->sign_k, 0, sizeof(mp_int));
+            }
         }
     }
 
+    if (ret == 0) {
+        ret = mp_init(key->sign_k);
+    }
     if (ret == 0) {
         ret = mp_read_unsigned_bin(key->sign_k, k, klen);
     }