public async Task ForceReseed()
{
var sources = new IEntropySource[] { new CryptoRandomSource(64), new CurrentTimeSource(), new GCMemorySource(), new TimerSource(), new UserSuppliedSource(CypherBasedPrngGenerator.CreateWithCheapKey().GetRandomBytes(2048)) };
var acc = new EntropyAccumulator(new StandardRandomWrapperGenerator());
var rng = PooledEntropyCprngGenerator.Create(sources, accumulator: acc, config: Conf());
Assert.AreEqual(rng.BytesRequested, 0);
Assert.AreEqual(rng.ReseedCount, 0);
Assert.AreEqual(rng.IsRunning, false);
Assert.AreEqual(rng.EntropyPriority, EntropyPriority.High);
Assert.AreEqual(rng.SourceCount, 5);
await rng.StartAndWaitForFirstSeed();
Assert.IsTrue(rng.ReseedCount >= 1);
Assert.IsTrue(acc.TotalEntropyBytes > 0);
Assert.AreNotEqual(rng.EntropyPriority, EntropyPriority.High);
var reseedCount = rng.ReseedCount;
var entropy = acc.TotalEntropyBytes;
await rng.Reseed();
Assert.IsTrue(rng.ReseedCount > reseedCount);
Assert.IsTrue(acc.TotalEntropyBytes > entropy);
await rng.Stop();
}
public async Task CreatePrngFromPooled()
{
var sources = new IEntropySource[] { new CryptoRandomSource(64), new CurrentTimeSource(), new GCMemorySource(), new TimerSource(), new UserSuppliedSource(CypherBasedPrngGenerator.CreateWithCheapKey().GetRandomBytes(2048)) };
var acc = new EntropyAccumulator(new StandardRandomWrapperGenerator());
var rng = PooledEntropyCprngGenerator.Create(sources, accumulator: acc, config: Conf());
Assert.AreEqual(rng.BytesRequested, 0);
Assert.AreEqual(rng.ReseedCount, 0);
Assert.AreEqual(rng.IsRunning, false);
Assert.AreEqual(rng.EntropyPriority, EntropyPriority.High);
Assert.AreEqual(rng.SourceCount, 5);
await rng.StartAndWaitForFirstSeed();
Assert.IsTrue(rng.ReseedCount >= 1);
Assert.IsTrue(acc.TotalEntropyBytes > 0);
System.Threading.Thread.Sleep(1); // EntropyPriority is only updated after the reseed event, so it might not be current.
Assert.AreNotEqual(rng.EntropyPriority, EntropyPriority.High);
var prng = rng.CreateCypherBasedGenerator();
Assert.IsNotNull(prng);
var bytes = prng.GetRandomBytes(16);
Assert.IsFalse(bytes.All(b => b == 0));
await rng.Stop();
}
/// <summary>
/// Creates a pooled random number generator that conforms to the Fortuna spec.
/// This is more conservative than Terninger; no randomised pools or low priority mode.
/// </summary>
public static PooledEntropyCprngGenerator CreateFortuna() =>
PooledEntropyCprngGenerator.Create(
initialisedSources: BasicSources(),
accumulator: new EntropyAccumulator(32, 0),
config: new PooledEntropyCprngGenerator.PooledGeneratorConfig()
{
// Set the ways to enter low priority mode so high they should never be hit.
ReseedCountBeforeSwitchToLowPriority = Int32.MaxValue,
TimeBeforeSwitchToLowPriority = TimeSpan.MaxValue,
// Reseed more aggressively as well.
MaximumBytesGeneratedBeforeReseed = 1024L * 1024L,
MinimumTimeBetweenReseeds = TimeSpan.FromHours(1),
}
);
public async Task EventIsRaisedOnReseed()
{
var sources = new IEntropySource[] { new CryptoRandomSource(64), new CurrentTimeSource(), new GCMemorySource(), new TimerSource(), new UserSuppliedSource(CypherBasedPrngGenerator.CreateWithCheapKey().GetRandomBytes(2048)) };
var acc = new EntropyAccumulator(new StandardRandomWrapperGenerator());
var rng = PooledEntropyCprngGenerator.Create(sources, accumulator: acc, config: Conf());
Object setInReseedEvent = null;
rng.OnReseed += (o, e) => setInReseedEvent = new object();
Assert.AreEqual(rng.BytesRequested, 0);
Assert.AreEqual(rng.ReseedCount, 0);
Assert.AreEqual(rng.IsRunning, false);
Assert.AreEqual(rng.EntropyPriority, EntropyPriority.High);
Assert.AreEqual(rng.SourceCount, 5);
await rng.StartAndWaitForFirstSeed();
Assert.IsNotNull(setInReseedEvent);
await rng.Stop();
}
public async Task GetFirstSeed_MixedSyncAndAsyncSources()
{
var sources = new IEntropySource[] { new CryptoRandomSource(32), new CurrentTimeSource(), new GCMemorySource(), new TimerSource(), new AsyncCryptoRandomSource(), new ProcessStatsSource(), new NetworkStatsSource() };
var acc = new EntropyAccumulator(new StandardRandomWrapperGenerator());
var rng = PooledEntropyCprngGenerator.Create(sources, accumulator: acc, config: Conf());
Assert.AreEqual(rng.BytesRequested, 0);
Assert.AreEqual(rng.ReseedCount, 0);
Assert.AreEqual(rng.IsRunning, false);
Assert.AreEqual(rng.EntropyPriority, EntropyPriority.High);
Assert.AreEqual(rng.SourceCount, 7);
await rng.StartAndWaitForFirstSeed();
Assert.IsTrue(rng.ReseedCount >= 1);
Assert.IsTrue(acc.TotalEntropyBytes > 0);
System.Threading.Thread.Sleep(1); // EntropyPriority is only updated after the reseed event, so it might not be current.
Assert.AreNotEqual(rng.EntropyPriority, EntropyPriority.High);
await rng.Stop();
}
public async Task FirstSeedYieldsDifferentBytes()
{
var sources = new IEntropySource[] { new CryptoRandomSource(64), new CurrentTimeSource(), new GCMemorySource(), new TimerSource(), new UserSuppliedSource(CypherBasedPrngGenerator.CreateWithCheapKey().GetRandomBytes(2048)) };
var acc1 = new EntropyAccumulator(new StandardRandomWrapperGenerator());
var rng1 = PooledEntropyCprngGenerator.Create(sources, accumulator: acc1, config: Conf());
await rng1.StartAndWaitForFirstSeed();
var acc2 = new EntropyAccumulator(new StandardRandomWrapperGenerator());
var rng2 = PooledEntropyCprngGenerator.Create(sources, accumulator: acc2, config: Conf());
await rng2.StartAndWaitForFirstSeed();
var bytesFrom1 = rng1.GetRandomBytes(64);
Assert.IsFalse(bytesFrom1.All(b => b == 0));
var bytesFrom2 = rng2.GetRandomBytes(64);
Assert.IsFalse(bytesFrom2.All(b => b == 0));
// Expect two generates with different inputs will give different bytes from from the start.
Assert.IsFalse(bytesFrom1.SequenceEqual(bytesFrom2));
await rng1.Stop();
await rng2.Stop();
}
/// <summary>
/// Creates a pooled random number generator that makes improvements and changes to the Fortuna spec.
/// This allows for less CPU usage, uses randomised pools, but isn't "official".
/// </summary>
public static PooledEntropyCprngGenerator CreateTerninger() =>
PooledEntropyCprngGenerator.Create(
initialisedSources: BasicSources(),
accumulator: new EntropyAccumulator(16, 16, CypherBasedPrngGenerator.CreateWithCheapKey())
);