From 766106e616c8326a79cf36e8478b0af4a7aa8d42 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Fri, 5 May 2017 11:45:37 -0700
Subject: [PATCH] Use sanity check timestamps as entropy

Cherry-picked from: 2c0a6f157da3c6bb3b0a1e77f003caf0d9cb9d6c
---
 src/random.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/random.cpp b/src/random.cpp
index 5224ddd608d..9d1396c9014 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -317,6 +317,10 @@ bool Random_SanityCheck()
     uint64_t stop = GetPerformanceCounter();
     if (stop == start) return false;
 
+    // We called GetPerformanceCounter. Use it as entropy.
+    RAND_add((const unsigned char*)&start, sizeof(start), 1);
+    RAND_add((const unsigned char*)&stop, sizeof(stop), 1);
+
     return true;
 }