1 files changed, 8 insertions, 19 deletions

diff --git a/src/random.h b/src/random.h
index 5fe20c5f76..49c0dff5bf 100644
--- a/src/random.h
+++ b/src/random.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2020 The Bitcoin Core developers
+// Copyright (c) 2009-2022 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -15,6 +15,7 @@
 #include <chrono>
 #include <cstdint>
 #include <limits>
+#include <vector>
 
 /**
  * Overall design of the RNG and entropy sources.
@@ -145,23 +146,11 @@ private:
     bool requires_seed;
     ChaCha20 rng;
 
-    unsigned char bytebuf[64];
-    int bytebuf_size;
-
     uint64_t bitbuf;
     int bitbuf_size;
 
     void RandomSeed();
 
-    void FillByteBuffer()
-    {
-        if (requires_seed) {
-            RandomSeed();
-        }
-        rng.Keystream(bytebuf, sizeof(bytebuf));
-        bytebuf_size = sizeof(bytebuf);
-    }
-
     void FillBitBuffer()
     {
         bitbuf = rand64();
@@ -185,10 +174,10 @@ public:
     /** Generate a random 64-bit integer. */
     uint64_t rand64() noexcept
     {
-        if (bytebuf_size < 8) FillByteBuffer();
-        uint64_t ret = ReadLE64(bytebuf + 64 - bytebuf_size);
-        bytebuf_size -= 8;
-        return ret;
+        if (requires_seed) RandomSeed();
+        unsigned char buf[8];
+        rng.Keystream(buf, 8);
+        return ReadLE64(buf);
     }
 
     /** Generate a random (bits)-bit integer. */
@@ -200,7 +189,7 @@ public:
             return rand64() >> (64 - bits);
         } else {
             if (bitbuf_size < bits) FillBitBuffer();
-            uint64_t ret = bitbuf & (~(uint64_t)0 >> (64 - bits));
+            uint64_t ret = bitbuf & (~uint64_t{0} >> (64 - bits));
             bitbuf >>= bits;
             bitbuf_size -= bits;
             return ret;
@@ -250,7 +239,7 @@ public:
                                    /* interval [0..0] */ Dur{0};
     };
 
-    // Compatibility with the C++11 UniformRandomBitGenerator concept
+    // Compatibility with the UniformRandomBitGenerator concept
     typedef uint64_t result_type;
     static constexpr uint64_t min() { return 0; }
     static constexpr uint64_t max() { return std::numeric_limits<uint64_t>::max(); }