ncTools

A small collection of high-quality, non-cryptographic utilities in a single header.

• Random Number Generators
  • wyrand — ultra-fast 64-bit PRNG (~13 GB/s), Excellent for high speed, single stream applications
  • RNG256 — 256-bit state PRNG, 2^256 period, Versatile jump/discard for up to 2^128 streams, ~4.2 GB/s
• Hash Functions
  • CompactHash — ~10 GB/s 128-bit hasher, all-in-one hashing, SMHasher clean
  • CompactHash_streaming — incremental version (identical output), streaming operators.

Features

• 100% C++, Header-only, no dependencies beyond C++17/20 intrinsics
• Passes PractRand (multi-TB) and SMHasher (full suite)
• Deterministic seeding resistant to poor inputs
• Minimal code size (~few hundred LOC core)

Usage

#include "ncTools.h"
using namespace ncTools;

wyrand rng(12345);
uint64_t r = rng();

RNG256 big_rng;
double d = big_rng.uni();

auto h = CompactHash(&data[0], data.size(), 42);
auto [lo, hi] = h;

Quick Demo

#define ENABLE_NCTOOLS_DEMO
#include "ncTools.h"
#include <iostream>

int main() {
	ncTools_demo();
}

See comments in ncTools.h for full API and test results.

License:

MIT.