Merge bitcoin/bitcoin#30571: test: [refactor] Use m_rng directly

948238a683b6c99f4e91114aa75680c6c2d73714 test: Remove FastRandomContext global (Ryan Ofsky)
fa0fe08eca48064b2a42789571fea017e455d820 scripted-diff: [test] Use g_rng/m_rng directly (MarcoFalke)
fa54cab4734f02422f28fdffc0f11e6d3d51b8f0 test: refactor: Accept any RandomNumberGenerator in RandMoney (MarcoFalke)
68f77dd21e4aaf4f09d36d6e5ddd7d260824b94b test: refactor: Pass rng parameters to test functions (Ryan Ofsky)
fa19af555dff6d6c722caf36319b158699d2aa95 test: refactor: Move g_insecure_rand_ctx.Reseed out of the helper that calls MakeRandDeterministicDANGEROUS (MarcoFalke)
3dc527f4602297ffcec3a578eadc480a620d01ec test: refactor: Give unit test functions access to test state (Ryan Ofsky)
fab023e177d7eaef73902869ae1c95693f1e268b test: refactor: Make unsigned promotion explicit (MarcoFalke)
fa2cb654eca8dd6ed89101cd6d199ba1de0b81e0 test: Add m_rng alias for the global random context (MarcoFalke)
fae7e3791c9ed8053166773fcfb583ad19d006dd test: Correct the random seed log on a prevector test failure (MarcoFalke)

Pull request description:

  This is mostly a style-cleanup for the tests' random generation:

  1) `g_insecure_rand_ctx` in the tests is problematic, because the name is a leftover when the generator was indeed insecure. However, now the generator is *deterministic*, because the seed is either passed in or printed (c.f. RANDOM_CTX_SEED). Stating that deterministic randomness is insecure in the tests seems redundant at best. Fix it by just using `m_rng` for the name.

  2) The global random context has many one-line aliases, such as `InsecureRand32`. This is problematic, because the same line of code may use the context directly and through a wrapper at the same time. For example in net_tests (see below). This inconsistency is harmless, but confusing. Fix it by just removing the one-line aliases.

  ```
  src/test/net_tests.cpp:        auto msg_data_1 = g_insecure_rand_ctx.randbytes<uint8_t>(InsecureRandRange(100000));
  ````

  3) The wrapper for randmoney has the same problem that the same unit test uses the context directly and through a wrapper at the same time. Also, it has a single type of Rng hardcoded. Fix it by accepting any type.

ACKs for top commit:
  hodlinator:
    ACK 948238a683b6c99f4e91114aa75680c6c2d73714
  ryanofsky:
    Code review ACK 948238a683b6c99f4e91114aa75680c6c2d73714. Only changes since last review were changing a comments a little bit.
  marcofleon:
    Code review ACK 948238a683b6c99f4e91114aa75680c6c2d73714. Only changes since my last review are the improvements in `prevector_tests`.

Tree-SHA512: 69c6b46a42cb743138ee8c87ff26a588dbe083e3efb3dca49b8a133ba5d3b09e8bf01c590ec7e121a7d77cb1fd7dcacd927a9ca139ac65e1f7c6d1ec46f93b57

1 files changed, 4 insertions, 3 deletions

diff --git a/src/bench/sign_transaction.cpp b/src/bench/sign_transaction.cpp
index 7b2a75942c..3f0635711d 100644
--- a/src/bench/sign_transaction.cpp
+++ b/src/bench/sign_transaction.cpp
@@ -75,12 +75,13 @@ 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([&] {