Kill insecure_random and associated global state

There are only a few uses of `insecure_random` outside the tests.
This PR replaces uses of insecure_random (and its accompanying global
state) in the core code with an FastRandomContext that is automatically
seeded on creation.

This is meant to be used for inner loops. The FastRandomContext
can be in the outer scope, or the class itself, then rand32() is used
inside the loop. Useful e.g. for pushing addresses in CNode or the fee
rounding, or randomization for coin selection.

As a context is created per purpose, thus it gets rid of
cross-thread unprotected shared usage of a single set of globals, this
should also get rid of the potential race conditions.

- I'd say TxMempool::check is not called enough to warrant using a special
  fast random context, this is switched to GetRand() (open for
  discussion...)

- The use of `insecure_rand` in ConnectThroughProxy has been replaced by
  an atomic integer counter. The only goal here is to have a different
  credentials pair for each connection to go on a different Tor circuit,
  it does not need to be random nor unpredictable.

- To avoid having a FastRandomContext on every CNode, the context is
  passed into PushAddress as appropriate.

There remains an insecure_random for test usage in `test_random.h`.

28 files changed, 92 insertions, 66 deletions

diff --git a/src/addrman.cpp b/src/addrman.cpp
index bfb8e94575..2016523212 100644
--- a/src/addrman.cpp
+++ b/src/addrman.cpp
@@ -358,8 +358,8 @@ CAddrInfo CAddrMan::Select_(bool newOnly)
             int nKBucket = RandomInt(ADDRMAN_TRIED_BUCKET_COUNT);
             int nKBucketPos = RandomInt(ADDRMAN_BUCKET_SIZE);
             while (vvTried[nKBucket][nKBucketPos] == -1) {
-                nKBucket = (nKBucket + insecure_rand()) % ADDRMAN_TRIED_BUCKET_COUNT;
-                nKBucketPos = (nKBucketPos + insecure_rand()) % ADDRMAN_BUCKET_SIZE;
+                nKBucket = (nKBucket + insecure_rand.rand32()) % ADDRMAN_TRIED_BUCKET_COUNT;
+                nKBucketPos = (nKBucketPos + insecure_rand.rand32()) % ADDRMAN_BUCKET_SIZE;
             }
             int nId = vvTried[nKBucket][nKBucketPos];
             assert(mapInfo.count(nId) == 1);
@@ -375,8 +375,8 @@ CAddrInfo CAddrMan::Select_(bool newOnly)
             int nUBucket = RandomInt(ADDRMAN_NEW_BUCKET_COUNT);
             int nUBucketPos = RandomInt(ADDRMAN_BUCKET_SIZE);
             while (vvNew[nUBucket][nUBucketPos] == -1) {
-                nUBucket = (nUBucket + insecure_rand()) % ADDRMAN_NEW_BUCKET_COUNT;
-                nUBucketPos = (nUBucketPos + insecure_rand()) % ADDRMAN_BUCKET_SIZE;
+                nUBucket = (nUBucket + insecure_rand.rand32()) % ADDRMAN_NEW_BUCKET_COUNT;
+                nUBucketPos = (nUBucketPos + insecure_rand.rand32()) % ADDRMAN_BUCKET_SIZE;
             }
             int nId = vvNew[nUBucket][nUBucketPos];
             assert(mapInfo.count(nId) == 1);
diff --git a/src/addrman.h b/src/addrman.h
index 9bab39049d..e9e137c978 100644
--- a/src/addrman.h
+++ b/src/addrman.h
@@ -211,6 +211,9 @@ protected:
     //! secret key to randomize bucket select with
     uint256 nKey;
 
+    //! Source of random numbers for randomization in inner loops
+    FastRandomContext insecure_rand;
+
     //! Find an entry.
     CAddrInfo* Find(const CNetAddr& addr, int *pnId = NULL);
 
diff --git a/src/main.cpp b/src/main.cpp
index c92a38be98..ab0dc07529 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4758,6 +4758,7 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman& connma
     uint64_t hashAddr = addr.GetHash();
     std::multimap<uint64_t, CNode*> mapMix;
     const CSipHasher hasher = connman.GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24*60*60));
+    FastRandomContext insecure_rand;
 
     auto sortfunc = [&mapMix, &hasher](CNode* pnode) {
         if (pnode->nVersion >= CADDR_TIME_VERSION) {
@@ -4766,9 +4767,9 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman& connma
         }
     };
 
-    auto pushfunc = [&addr, &mapMix, &nRelayNodes] {
+    auto pushfunc = [&addr, &mapMix, &nRelayNodes, &insecure_rand] {
         for (auto mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
-            mi->second->PushAddress(addr);
+            mi->second->PushAddress(addr, insecure_rand);
     };
 
     connman.ForEachNodeThen(std::move(sortfunc), std::move(pushfunc));
@@ -5078,14 +5079,15 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
             if (fListen && !IsInitialBlockDownload())
             {
                 CAddress addr = GetLocalAddress(&pfrom->addr, pfrom->GetLocalServices());
+                FastRandomContext insecure_rand;
                 if (addr.IsRoutable())
                 {
                     LogPrint("net", "ProcessMessages: advertising address %s\n", addr.ToString());
-                    pfrom->PushAddress(addr);
+                    pfrom->PushAddress(addr, insecure_rand);
                 } else if (IsPeerAddrLocalGood(pfrom)) {
                     addr.SetIP(pfrom->addrLocal);
                     LogPrint("net", "ProcessMessages: advertising address %s\n", addr.ToString());
-                    pfrom->PushAddress(addr);
+                    pfrom->PushAddress(addr, insecure_rand);
                 }
             }
 
@@ -6008,8 +6010,9 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
 
         pfrom->vAddrToSend.clear();
         vector<CAddress> vAddr = connman.GetAddresses();
+        FastRandomContext insecure_rand;
         BOOST_FOREACH(const CAddress &addr, vAddr)
-            pfrom->PushAddress(addr);
+            pfrom->PushAddress(addr, insecure_rand);
     }
 
 
@@ -6842,7 +6845,7 @@ bool SendMessages(CNode* pto, CConnman& connman)
             // until scheduled broadcast, then move the broadcast to within MAX_FEEFILTER_CHANGE_DELAY.
             else if (timeNow + MAX_FEEFILTER_CHANGE_DELAY * 1000000 < pto->nextSendTimeFeeFilter &&
                      (currentFilter < 3 * pto->lastSentFeeFilter / 4 || currentFilter > 4 * pto->lastSentFeeFilter / 3)) {
-                pto->nextSendTimeFeeFilter = timeNow + (insecure_rand() % MAX_FEEFILTER_CHANGE_DELAY) * 1000000;
+                pto->nextSendTimeFeeFilter = timeNow + GetRandInt(MAX_FEEFILTER_CHANGE_DELAY) * 1000000;
             }
         }
     }
diff --git a/src/net.cpp b/src/net.cpp
index 19dd040997..643dd806df 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -187,7 +187,8 @@ void AdvertiseLocal(CNode *pnode)
         if (addrLocal.IsRoutable())
         {
             LogPrint("net", "AdvertiseLocal: advertising address %s\n", addrLocal.ToString());
-            pnode->PushAddress(addrLocal);
+            FastRandomContext insecure_rand;
+            pnode->PushAddress(addrLocal, insecure_rand);
         }
     }
 }
diff --git a/src/net.h b/src/net.h
index 67f0abe4be..3417cb2aba 100644
--- a/src/net.h
+++ b/src/net.h
@@ -735,14 +735,14 @@ public:
         addrKnown.insert(_addr.GetKey());
     }
 
-    void PushAddress(const CAddress& _addr)
+    void PushAddress(const CAddress& _addr, FastRandomContext &insecure_rand)
     {
         // Known checking here is only to save space from duplicates.
         // SendMessages will filter it again for knowns that were added
         // after addresses were pushed.
         if (_addr.IsValid() && !addrKnown.contains(_addr.GetKey())) {
             if (vAddrToSend.size() >= MAX_ADDR_TO_SEND) {
-                vAddrToSend[insecure_rand() % vAddrToSend.size()] = _addr;
+                vAddrToSend[insecure_rand.rand32() % vAddrToSend.size()] = _addr;
             } else {
                 vAddrToSend.push_back(_addr);
             }
diff --git a/src/netbase.cpp b/src/netbase.cpp
index 7d7f1b6788..9fe34108f5 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -596,8 +596,8 @@ static bool ConnectThroughProxy(const proxyType &proxy, const std::string& strDe
     // do socks negotiation
     if (proxy.randomize_credentials) {
         ProxyCredentials random_auth;
-        random_auth.username = strprintf("%i", insecure_rand());
-        random_auth.password = strprintf("%i", insecure_rand());
+        static std::atomic_int counter;
+        random_auth.username = random_auth.password = strprintf("%i", counter++);
         if (!Socks5(strDest, (unsigned short)port, &random_auth, hSocket))
             return false;
     } else {
diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp
index 7b0e8b7d08..c07cd2eff8 100644
--- a/src/policy/fees.cpp
+++ b/src/policy/fees.cpp
@@ -594,7 +594,7 @@ FeeFilterRounder::FeeFilterRounder(const CFeeRate& minIncrementalFee)
 CAmount FeeFilterRounder::round(CAmount currentMinFee)
 {
     std::set<double>::iterator it = feeset.lower_bound(currentMinFee);
-    if ((it != feeset.begin() && insecure_rand() % 3 != 0) || it == feeset.end()) {
+    if ((it != feeset.begin() && insecure_rand.rand32() % 3 != 0) || it == feeset.end()) {
         it--;
     }
     return *it;
diff --git a/src/policy/fees.h b/src/policy/fees.h
index 463f62f710..2c1ac3b934 100644
--- a/src/policy/fees.h
+++ b/src/policy/fees.h
@@ -7,6 +7,7 @@
 
 #include "amount.h"
 #include "uint256.h"
+#include "random.h"
 
 #include <map>
 #include <string>
@@ -298,5 +299,6 @@ public:
 
 private:
     std::set<double> feeset;
+    FastRandomContext insecure_rand;
 };
 #endif /*BITCOIN_POLICYESTIMATOR_H */
diff --git a/src/random.cpp b/src/random.cpp
index d9a8cc145e..aa027e49c4 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -178,22 +178,21 @@ uint256 GetRandHash()
     return hash;
 }
 
-uint32_t insecure_rand_Rz = 11;
-uint32_t insecure_rand_Rw = 11;
-void seed_insecure_rand(bool fDeterministic)
+FastRandomContext::FastRandomContext(bool fDeterministic)
 {
     // The seed values have some unlikely fixed points which we avoid.
     if (fDeterministic) {
-        insecure_rand_Rz = insecure_rand_Rw = 11;
+        Rz = Rw = 11;
     } else {
         uint32_t tmp;
         do {
             GetRandBytes((unsigned char*)&tmp, 4);
         } while (tmp == 0 || tmp == 0x9068ffffU);
-        insecure_rand_Rz = tmp;
+        Rz = tmp;
         do {
             GetRandBytes((unsigned char*)&tmp, 4);
         } while (tmp == 0 || tmp == 0x464fffffU);
-        insecure_rand_Rw = tmp;
+        Rw = tmp;
     }
 }
+
diff --git a/src/random.h b/src/random.h
index 31b80bd565..e97d2d1fb0 100644
--- a/src/random.h
+++ b/src/random.h
@@ -28,25 +28,22 @@ uint256 GetRandHash();
 void GetStrongRandBytes(unsigned char* buf, int num);
 
 /**
- * Seed insecure_rand using the random pool.
- * @param Deterministic Use a deterministic seed
+ * Fast randomness source. This is seeded once with secure random data, but
+ * is completely deterministic and insecure after that.
+ * This class is not thread-safe.
  */
-void seed_insecure_rand(bool fDeterministic = false);
-
-/**
- * MWC RNG of George Marsaglia
- * This is intended to be fast. It has a period of 2^59.3, though the
- * least significant 16 bits only have a period of about 2^30.1.
- *
- * @return random value
- */
-extern uint32_t insecure_rand_Rz;
-extern uint32_t insecure_rand_Rw;
-static inline uint32_t insecure_rand(void)
-{
-    insecure_rand_Rz = 36969 * (insecure_rand_Rz & 65535) + (insecure_rand_Rz >> 16);
-    insecure_rand_Rw = 18000 * (insecure_rand_Rw & 65535) + (insecure_rand_Rw >> 16);
-    return (insecure_rand_Rw << 16) + insecure_rand_Rz;
-}
+class FastRandomContext {
+public:
+    explicit FastRandomContext(bool fDeterministic=false);
+
+    uint32_t rand32() {
+        Rz = 36969 * (Rz & 65535) + (Rz >> 16);
+        Rw = 18000 * (Rw & 65535) + (Rw >> 16);
+        return (Rw << 16) + Rz;
+    }
+
+    uint32_t Rz;
+    uint32_t Rw;
+};
 
 #endif // BITCOIN_RANDOM_H
diff --git a/src/test/addrman_tests.cpp b/src/test/addrman_tests.cpp
index 5ccaeb57bb..adff09f754 100644
--- a/src/test/addrman_tests.cpp
+++ b/src/test/addrman_tests.cpp
@@ -26,7 +26,7 @@ public:
     void MakeDeterministic()
     {
         nKey.SetNull();
-        seed_insecure_rand(true);
+        insecure_rand = FastRandomContext(true);
     }
 
     int RandomInt(int nMax)
diff --git a/src/test/coins_tests.cpp b/src/test/coins_tests.cpp
index e692326559..b487686136 100644
--- a/src/test/coins_tests.cpp
+++ b/src/test/coins_tests.cpp
@@ -3,7 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "coins.h"
-#include "random.h"
+#include "test_random.h"
 #include "script/standard.h"
 #include "uint256.h"
 #include "utilstrencodings.h"
diff --git a/src/test/crypto_tests.cpp b/src/test/crypto_tests.cpp
index ff0adae1d2..c7b4fb240c 100644
--- a/src/test/crypto_tests.cpp
+++ b/src/test/crypto_tests.cpp
@@ -9,7 +9,7 @@
 #include "crypto/sha512.h"
 #include "crypto/hmac_sha256.h"
 #include "crypto/hmac_sha512.h"
-#include "random.h"
+#include "test_random.h"
 #include "utilstrencodings.h"
 #include "test/test_bitcoin.h"
 
diff --git a/src/test/merkle_tests.cpp b/src/test/merkle_tests.cpp
index b40ab848dc..66ca381ea7 100644
--- a/src/test/merkle_tests.cpp
+++ b/src/test/merkle_tests.cpp
@@ -4,7 +4,7 @@
 
 #include "consensus/merkle.h"
 #include "test/test_bitcoin.h"
-#include "random.h"
+#include "test_random.h"
 
 #include <boost/test/unit_test.hpp>
 
diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
index 4a7d6e778f..f4b5768693 100644
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -23,7 +23,7 @@ public:
     void MakeDeterministic()
     {
         nKey.SetNull();
-        seed_insecure_rand(true);
+        insecure_rand = FastRandomContext(true);
     }
 };
 
diff --git a/src/test/pmt_tests.cpp b/src/test/pmt_tests.cpp
index e9c8691745..b7f83d38f0 100644
--- a/src/test/pmt_tests.cpp
+++ b/src/test/pmt_tests.cpp
@@ -9,7 +9,7 @@
 #include "uint256.h"
 #include "arith_uint256.h"
 #include "version.h"
-#include "random.h"
+#include "test_random.h"
 #include "test/test_bitcoin.h"
 
 #include <vector>
diff --git a/src/test/prevector_tests.cpp b/src/test/prevector_tests.cpp
index b8c45ca564..6cad02e738 100644
--- a/src/test/prevector_tests.cpp
+++ b/src/test/prevector_tests.cpp
@@ -4,7 +4,7 @@
 
 #include <vector>
 #include "prevector.h"
-#include "random.h"
+#include "test_random.h"
 
 #include "serialize.h"
 #include "streams.h"
@@ -27,8 +27,7 @@ class prevector_tester {
 
     typedef typename pretype::size_type Size;
     bool passed = true;
-    uint32_t insecure_rand_Rz_cache;
-    uint32_t insecure_rand_Rw_cache;
+    FastRandomContext rand_cache;
 
 
     template <typename A, typename B>
@@ -171,15 +170,14 @@ public:
         test();
     }
     ~prevector_tester() {
-        BOOST_CHECK_MESSAGE(passed, "insecure_rand_Rz: " 
-                << insecure_rand_Rz_cache 
+        BOOST_CHECK_MESSAGE(passed, "insecure_rand_Rz: "
+                << rand_cache.Rz
                 << ", insecure_rand_Rw: "
-                << insecure_rand_Rw_cache);
+                << rand_cache.Rw);
     }
     prevector_tester() {
         seed_insecure_rand();
-        insecure_rand_Rz_cache = insecure_rand_Rz;
-        insecure_rand_Rw_cache = insecure_rand_Rw;
+        rand_cache = insecure_rand_ctx;
     }
 };
 
diff --git a/src/test/scheduler_tests.cpp b/src/test/scheduler_tests.cpp
index aa12dfbd54..891ecf5015 100644
--- a/src/test/scheduler_tests.cpp
+++ b/src/test/scheduler_tests.cpp
@@ -42,8 +42,6 @@ static void MicroSleep(uint64_t n)
 
 BOOST_AUTO_TEST_CASE(manythreads)
 {
-    seed_insecure_rand(false);
-
     // Stress test: hundreds of microsecond-scheduled tasks,
     // serviced by 10 threads.
     //
@@ -58,7 +56,7 @@ BOOST_AUTO_TEST_CASE(manythreads)
 
     boost::mutex counterMutex[10];
     int counter[10] = { 0 };
-    boost::random::mt19937 rng(insecure_rand());
+    boost::random::mt19937 rng(42);
     boost::random::uniform_int_distribution<> zeroToNine(0, 9);
     boost::random::uniform_int_distribution<> randomMsec(-11, 1000);
     boost::random::uniform_int_distribution<> randomDelta(-1000, 1000);
diff --git a/src/test/sighash_tests.cpp b/src/test/sighash_tests.cpp
index 4a48347b70..0b1050d020 100644
--- a/src/test/sighash_tests.cpp
+++ b/src/test/sighash_tests.cpp
@@ -6,7 +6,7 @@
 #include "data/sighash.json.h"
 #include "hash.h"
 #include "main.h" // For CheckTransaction
-#include "random.h"
+#include "test_random.h"
 #include "script/interpreter.h"
 #include "script/script.h"
 #include "serialize.h"
diff --git a/src/test/skiplist_tests.cpp b/src/test/skiplist_tests.cpp
index f14b902fe1..b19f8fbffb 100644
--- a/src/test/skiplist_tests.cpp
+++ b/src/test/skiplist_tests.cpp
@@ -3,7 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "chain.h"
-#include "random.h"
+#include "test_random.h"
 #include "util.h"
 #include "test/test_bitcoin.h"
 
diff --git a/src/test/test_bitcoin.cpp b/src/test/test_bitcoin.cpp
index 02843d8525..27ea837fbf 100644
--- a/src/test/test_bitcoin.cpp
+++ b/src/test/test_bitcoin.cpp
@@ -27,6 +27,7 @@
 #include <boost/thread.hpp>
 
 std::unique_ptr<CConnman> g_connman;
+FastRandomContext insecure_rand_ctx(true);
 
 extern bool fPrintToConsole;
 extern void noui_connect();
diff --git a/src/test/test_random.h b/src/test/test_random.h
new file mode 100644
index 0000000000..e61b92b7bc
--- /dev/null
+++ b/src/test/test_random.h
@@ -0,0 +1,23 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2014 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_TEST_RANDOM_H
+#define BITCOIN_TEST_RANDOM_H
+
+#include "random.h"
+
+extern FastRandomContext insecure_rand_ctx;
+
+static inline void seed_insecure_rand(bool fDeterministic = false)
+{
+    insecure_rand_ctx = FastRandomContext(fDeterministic);
+}
+
+static inline uint32_t insecure_rand(void)
+{
+    return insecure_rand_ctx.rand32();
+}
+
+#endif
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index efd4498747..0f1c7ab222 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -6,7 +6,7 @@
 
 #include "clientversion.h"
 #include "primitives/transaction.h"
-#include "random.h"
+#include "test_random.h"
 #include "sync.h"
 #include "utilstrencodings.h"
 #include "utilmoneystr.h"
diff --git a/src/test/versionbits_tests.cpp b/src/test/versionbits_tests.cpp
index 1f86a06a3f..ffc0ff6f8e 100644
--- a/src/test/versionbits_tests.cpp
+++ b/src/test/versionbits_tests.cpp
@@ -3,7 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "chain.h"
-#include "random.h"
+#include "test_random.h"
 #include "versionbits.h"
 #include "test/test_bitcoin.h"
 #include "chainparams.h"
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 15fa6fbca3..0f1c166abc 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -647,7 +647,7 @@ void CTxMemPool::check(const CCoinsViewCache *pcoins) const
     if (nCheckFrequency == 0)
         return;
 
-    if (insecure_rand() >= nCheckFrequency)
+    if (GetRand(std::numeric_limits<uint32_t>::max()) >= nCheckFrequency)
         return;
 
     LogPrint("mempool", "Checking mempool with %u transactions and %u inputs\n", (unsigned int)mapTx.size(), (unsigned int)mapNextTx.size());
diff --git a/src/txmempool.h b/src/txmempool.h
index 941644b2b2..1763930ba0 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -15,6 +15,7 @@
 #include "indirectmap.h"
 #include "primitives/transaction.h"
 #include "sync.h"
+#include "random.h"
 
 #undef foreach
 #include "boost/multi_index_container.hpp"
diff --git a/src/wallet/test/crypto_tests.cpp b/src/wallet/test/crypto_tests.cpp
index 05387f5f2b..c5f55ef5f0 100644
--- a/src/wallet/test/crypto_tests.cpp
+++ b/src/wallet/test/crypto_tests.cpp
@@ -2,7 +2,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-#include "random.h"
+#include "test/test_random.h"
 #include "utilstrencodings.h"
 #include "test/test_bitcoin.h"
 #include "wallet/crypter.h"
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index a1f69dd94d..687d84e77a 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1907,7 +1907,7 @@ static void ApproximateBestSubset(vector<pair<CAmount, pair<const CWalletTx*,uns
     vfBest.assign(vValue.size(), true);
     nBest = nTotalLower;
 
-    seed_insecure_rand();
+    FastRandomContext insecure_rand;
 
     for (int nRep = 0; nRep < iterations && nBest != nTargetValue; nRep++)
     {
@@ -1924,7 +1924,7 @@ static void ApproximateBestSubset(vector<pair<CAmount, pair<const CWalletTx*,uns
                 //that the rng is fast. We do not use a constant random sequence,
                 //because there may be some privacy improvement by making
                 //the selection random.
-                if (nPass == 0 ? insecure_rand()&1 : !vfIncluded[i])
+                if (nPass == 0 ? insecure_rand.rand32()&1 : !vfIncluded[i])
                 {
                     nTotal += vValue[i].first;
                     vfIncluded[i] = true;