diff options
| -rw-r--r-- | src/init.cpp | 5 | ||||
| -rw-r--r-- | src/random.cpp | 46 | ||||
| -rw-r--r-- | src/random.h | 4 | ||||
| -rw-r--r-- | src/scheduler.cpp | 2 |
4 files changed, 24 insertions, 33 deletions
diff --git a/src/init.cpp b/src/init.cpp index f02740786d..2abdf7dbc4 100644 --- a/src/init.cpp +++ b/src/init.cpp @@ -1258,6 +1258,11 @@ bool AppInitMain(NodeContext& node) CScheduler::Function serviceLoop = std::bind(&CScheduler::serviceQueue, &scheduler); threadGroup.create_thread(std::bind(&TraceThread<CScheduler::Function>, "scheduler", serviceLoop)); + // Gather some entropy once per minute. + scheduler.scheduleEvery([]{ + RandAddPeriodic(); + }, 60000); + GetMainSignals().RegisterBackgroundSignalScheduler(scheduler); GetMainSignals().RegisterWithMempoolSignals(mempool); diff --git a/src/random.cpp b/src/random.cpp index 6f162a7cf0..2847aacf6f 100644 --- a/src/random.cpp +++ b/src/random.cpp @@ -507,22 +507,16 @@ static void SeedSlow(CSHA512& hasher) noexcept } /** Extract entropy from rng, strengthen it, and feed it into hasher. */ -static void SeedStrengthen(CSHA512& hasher, RNGState& rng) noexcept +static void SeedStrengthen(CSHA512& hasher, RNGState& rng, int microseconds) noexcept { - static std::atomic<int64_t> last_strengthen{0}; - int64_t last_time = last_strengthen.load(); - int64_t current_time = GetTimeMicros(); - if (current_time > last_time + 60000000) { // Only run once a minute - // Generate 32 bytes of entropy from the RNG, and a copy of the entropy already in hasher. - unsigned char strengthen_seed[32]; - rng.MixExtract(strengthen_seed, sizeof(strengthen_seed), CSHA512(hasher), false); - // Strengthen it for 10ms (100ms on first run), and feed it into hasher. - Strengthen(strengthen_seed, last_time == 0 ? 100000 : 10000, hasher); - last_strengthen = current_time; - } + // Generate 32 bytes of entropy from the RNG, and a copy of the entropy already in hasher. + unsigned char strengthen_seed[32]; + rng.MixExtract(strengthen_seed, sizeof(strengthen_seed), CSHA512(hasher), false); + // Strengthen the seed, and feed it into hasher. + Strengthen(strengthen_seed, microseconds, hasher); } -static void SeedSleep(CSHA512& hasher, RNGState& rng) +static void SeedPeriodic(CSHA512& hasher, RNGState& rng) { // Everything that the 'fast' seeder includes SeedFast(hasher); @@ -530,17 +524,11 @@ static void SeedSleep(CSHA512& hasher, RNGState& rng) // High-precision timestamp SeedTimestamp(hasher); - // Sleep for 1ms - MilliSleep(1); - - // High-precision timestamp after sleeping (as we commit to both the time before and after, this measures the delay) - SeedTimestamp(hasher); - - // Dynamic environment data (performance monitoring, ...; once every 10 minutes) + // Dynamic environment data (performance monitoring, ...) RandAddDynamicEnv(hasher); - // Strengthen every minute - SeedStrengthen(hasher, rng); + // Strengthen for 10 ms + SeedStrengthen(hasher, rng, 10000); } static void SeedStartup(CSHA512& hasher, RNGState& rng) noexcept @@ -551,20 +539,20 @@ static void SeedStartup(CSHA512& hasher, RNGState& rng) noexcept // Everything that the 'slow' seeder includes. SeedSlow(hasher); - // Dynamic environment data + // Dynamic environment data (performance monitoring, ...) RandAddDynamicEnv(hasher); // Static environment data RandAddStaticEnv(hasher); - // Strengthen - SeedStrengthen(hasher, rng); + // Strengthen for 100 ms + SeedStrengthen(hasher, rng, 100000); } enum class RNGLevel { FAST, //!< Automatically called by GetRandBytes SLOW, //!< Automatically called by GetStrongRandBytes - SLEEP, //!< Called by RandAddSeedSleep() + PERIODIC, //!< Called by RandAddPeriodic() }; static void ProcRand(unsigned char* out, int num, RNGLevel level) @@ -582,8 +570,8 @@ static void ProcRand(unsigned char* out, int num, RNGLevel level) case RNGLevel::SLOW: SeedSlow(hasher); break; - case RNGLevel::SLEEP: - SeedSleep(hasher, rng); + case RNGLevel::PERIODIC: + SeedPeriodic(hasher, rng); break; } @@ -606,7 +594,7 @@ static void ProcRand(unsigned char* out, int num, RNGLevel level) void GetRandBytes(unsigned char* buf, int num) noexcept { ProcRand(buf, num, RNGLevel::FAST); } void GetStrongRandBytes(unsigned char* buf, int num) noexcept { ProcRand(buf, num, RNGLevel::SLOW); } -void RandAddSeedSleep() { ProcRand(nullptr, 0, RNGLevel::SLEEP); } +void RandAddPeriodic() { ProcRand(nullptr, 0, RNGLevel::PERIODIC); } bool g_mock_deterministic_tests{false}; diff --git a/src/random.h b/src/random.h index b5a7faf48c..7768f9d3c5 100644 --- a/src/random.h +++ b/src/random.h @@ -84,11 +84,11 @@ uint256 GetRandHash() noexcept; void GetStrongRandBytes(unsigned char* buf, int num) noexcept; /** - * Sleep for 1ms, gather entropy from various sources, and feed them to the PRNG state. + * Gather entropy from various expensive sources, and feed them to the PRNG state. * * Thread-safe. */ -void RandAddSeedSleep(); +void RandAddPeriodic(); /** * Fast randomness source. This is seeded once with secure random data, but diff --git a/src/scheduler.cpp b/src/scheduler.cpp index fdc859b3a0..07a54335ac 100644 --- a/src/scheduler.cpp +++ b/src/scheduler.cpp @@ -41,8 +41,6 @@ void CScheduler::serviceQueue() try { if (!shouldStop() && taskQueue.empty()) { reverse_lock<boost::unique_lock<boost::mutex> > rlock(lock); - // Use this chance to get more entropy - RandAddSeedSleep(); } while (!shouldStop() && taskQueue.empty()) { // Wait until there is something to do. |