From 399fb8f2d0fa9cff2f461ef2c0da5b91765987f1 Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Mon, 22 May 2017 16:01:29 -0400
Subject: [PATCH] Add internal method to add new random data to our internal
 RNG state

---
 src/random.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/random.cpp b/src/random.cpp
index 3b9df3edaa..3c856ecfa6 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -207,6 +207,22 @@ static std::mutex cs_rng_state;
 static unsigned char rng_state[32] = {0};
 static uint64_t rng_counter = 0;
 
+static void AddDataToRng(void* data, size_t len) {
+    CSHA512 hasher;
+    hasher.Write((const unsigned char*)&len, sizeof(len));
+    hasher.Write((const unsigned char*)data, len);
+    unsigned char buf[64];
+    {
+        std::unique_lock<std::mutex> lock(cs_rng_state);
+        hasher.Write(rng_state, sizeof(rng_state));
+        hasher.Write((const unsigned char*)&rng_counter, sizeof(rng_counter));
+        ++rng_counter;
+        hasher.Finalize(buf);
+        memcpy(rng_state, buf + 32, 32);
+    }
+    memory_cleanse(buf, 64);
+}
+
 void GetStrongRandBytes(unsigned char* out, int num)
 {
     assert(num <= 32);