/// <summary>
/// Set up the seeding algorithms
/// </summary>
private static void Initialize()
{
sm_rdtscAtFirstCall = LCPRNG_MMIX.Next(RDTSC8());
// Temporal: Related to when in time this initialization occurred. Not super
// accurate ( around 100ns i believe).
var medium = (long)DateTime.Now.Ticks;
// Temporal: Related to when(-ish) this object was loaded by .NET. This is
// affected by what other objects in the program have already been instantiated.
// Since this is Framework, we assume a varied instantiation order, yet
// admittedly (potentially?) constant for each specific program. Please review
// GetHashCode for more info on how this value is determined.
//
// This is a boxing operation:
var course1 = LCPRNG_MMIX.Next(sm_instantiationSeed.GetHashCode());
// This is not a boxing operation:
var course2 = LCPRNG_MMIX.Next(sm_lock.GetHashCode());
// These bytes are generated in part based on the crypto seeding algorithm,
// thereby adding significant randomness
var buf = new byte[8];
sm_masterRng.GetBytes(buf);
var crypto = BitConverter.ToInt64(buf, 0);
// So merge the two, guessing that we needed the swapped version
sm_instantiationSeed = LCPRNG_MMIX.Next(medium ^ course1 ^ course2 ^ crypto);
}
/// <summary>
/// Except for one-time initialization, this consists of one compare, one interlocked
/// increment, a multiply and add, and a cast. Provides a value affected by
/// instantiation count run through Knuth's values for a 64-bit linear congruential
/// generator. Initialization uses three different time values merged together
/// non-destructively.
/// </summary>
/// <returns>
/// A seed that will be statistically different each time this is called.
/// </returns>
/// <remarks>
/// This is not suitable for cryptography. Knowing when the program was started can
/// significantly compromise the secret of this algorithm.
/// </remarks>
public static ulong FastULong()
{
// Very quickly attribute the fact that this is a "+1" operation (i.e. allow
// multiple rapid invocations yield different results)
Interlocked.Increment(ref sm_instantiationSeed);
sm_instantiationSeed = LCPRNG_MMIX.Next(sm_instantiationSeed);
return((ulong)(sm_instantiationSeed ^ sm_rdtscAtFirstCall ^ sm_rdtscAtStaticInitialization));
}
