test: Remove FastRandomContext global

Drop g_insecure_rand_ctx

src/bench/sign_transaction.cpp

@@ -69,12 +69,13 @@ static void SignTransactionSchnorr(benchmark::Bench& bench) { SignTransactionSin
 
 static void SignSchnorrTapTweakBenchmark(benchmark::Bench& bench, bool use_null_merkle_root)
 {
+    FastRandomContext rng;
     ECC_Context ecc_context{};
 
     auto key = GenerateRandomKey();
-    auto msg = InsecureRand256();
-    auto merkle_root = use_null_merkle_root ? uint256() : InsecureRand256();
-    auto aux = InsecureRand256();
+    auto msg = rng.rand256();
+    auto merkle_root = use_null_merkle_root ? uint256() : rng.rand256();
+    auto aux = rng.rand256();
     std::vector<unsigned char> sig(64);
 
     bench.minEpochIterations(100).run([&] {

src/test/fuzz/fuzz.cpp

@@ -107,7 +107,6 @@ void initialize()
     // - GetStrongRandBytes(), which is used for the creation of private key material.
     // - Creating a BasicTestingSetup or derived class will switch to a random seed.
     SeedRandomStateForTest(SeedRand::ZEROS);
-    g_insecure_rand_ctx.Reseed(GetRandHash());
 
     // Terminate immediately if a fuzzing harness ever tries to create a socket.
     // Individual tests can override this by pointing CreateSock to a mocked alternative.

src/test/util/random.cpp

@@ -11,8 +11,6 @@
 #include <cstdlib>
 #include <string>
 
-FastRandomContext g_insecure_rand_ctx;
-
 extern void MakeRandDeterministicDANGEROUS(const uint256& seed) noexcept;
 
 void SeedRandomStateForTest(SeedRand seedtype)

src/test/util/random.h

@@ -11,14 +11,6 @@
 
 #include <cstdint>
 
-/**
- * This global and the helpers that use it are not thread-safe.
- *
- * If thread-safety is needed, a per-thread instance could be
- * used in the multi-threaded test.
- */
-extern FastRandomContext g_insecure_rand_ctx;
-
 enum class SeedRand {
     ZEROS, //!< Seed with a compile time constant of zeros
     SEED,  //!< Use (and report) random seed from environment, or a (truly) random one.
@@ -27,31 +19,6 @@ enum class SeedRand {
 /** Seed the global RNG state for testing and log the seed value. This affects all randomness, except GetStrongRandBytes(). */
 void SeedRandomStateForTest(SeedRand seed);
 
-static inline uint32_t InsecureRand32()
-{
-    return g_insecure_rand_ctx.rand32();
-}
-
-static inline uint256 InsecureRand256()
-{
-    return g_insecure_rand_ctx.rand256();
-}
-
-static inline uint64_t InsecureRandBits(int bits)
-{
-    return g_insecure_rand_ctx.randbits(bits);
-}
-
-static inline uint64_t InsecureRandRange(uint64_t range)
-{
-    return g_insecure_rand_ctx.randrange(range);
-}
-
-static inline bool InsecureRandBool()
-{
-    return g_insecure_rand_ctx.randbool();
-}
-
 template <RandomNumberGenerator Rng>
 inline CAmount RandMoney(Rng&& rng)
 {

src/test/util/setup_common.h

@@ -66,7 +66,7 @@ struct BasicTestingSetup {
     util::SignalInterrupt m_interrupt;
     node::NodeContext m_node; // keep as first member to be destructed last
 
-    FastRandomContext& m_rng{g_insecure_rand_ctx}; // Alias (reference) for the global, to allow easy removal of the global in the future.
+    FastRandomContext m_rng;
     /** Seed the global RNG state and m_rng for testing and log the seed value. This affects all randomness, except GetStrongRandBytes(). */
     void SeedRandomForTest(SeedRand seed = SeedRand::SEED)
     {