[PrivateSend] Performance tweak: faster shuffling of Masternodes vector (#1063)

src/init.cpp

@@ -1151,7 +1151,10 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
         fEnableReplacement = (std::find(vstrReplacementModes.begin(), vstrReplacementModes.end(), "fee") != vstrReplacementModes.end());
     }
 
-    // ********************************************************* Step 4: application initialization: dir lock, daemonize, pidfile, debug log
+    // ********************************************************* Step 4: application initialization: dir lock, daemonize, pidfile, debug log, seed insecure_rand()
+
+    // Initialize fast PRNG
+    seed_insecure_rand(false);
 
     // Initialize elliptic curve code
     ECC_Start();

src/masternodeman.cpp

@@ -373,7 +373,7 @@ CMasternode *CMasternodeMan::FindRandomNotInVec(std::vector<CTxIn> &vecToExclude
     }
 
     // shuffle pointers
-    std::random_shuffle(vpMasternodesShuffled.begin(), vpMasternodesShuffled.end(), GetRandInt);
+    std::random_shuffle(vpMasternodesShuffled.begin(), vpMasternodesShuffled.end(), GetInsecureRand);
     bool fExclude;
 
     // loop through

src/random.h

@@ -46,4 +46,11 @@ static inline uint32_t insecure_rand(void)
     return (insecure_rand_Rw << 16) + insecure_rand_Rz;
 }
 
+/**
+ * Function for std::random_shuffle
+ */
+static inline uint32_t GetInsecureRand(uint32_t i){
+    return insecure_rand() % i;
+}
+
 #endif // BITCOIN_RANDOM_H