smchash

High-performance hash function passing all 188 SMHasher3 quality tests.

Features

• Fast: Passes all 188 SMHasher3 quality tests
• no_std compatible: Works in embedded environments
• Built-in PRNG: smc_rand() passes BigCrush and PractRand
• Cache-friendly: Processes 128 bytes (2 cache lines) per iteration

Usage

use smchash::{smchash, smchash_seeded, smc_rand};

// Basic hashing
let hash = smchash(b"Hello, World!");

// Seeded hashing
let hash = smchash_seeded(b"Hello", 12345);

// PRNG (passes BigCrush/PractRand)
let mut seed = 42u64;
let random = smc_rand(&mut seed);

API

• smchash(data: &[u8]) -> u64 - Hash with default seed
• smchash_seeded(data: &[u8], seed: u64) -> u64 - Hash with custom seed
• smchash_secret(data: &[u8], seed: u64, secret: &[u64; 9]) -> u64 - Hash with custom secrets
• smc_rand(seed: &mut u64) -> u64 - PRNG

Performance

• 128-bit MUM (Multiply-XOR-Mix) construction
• 8 parallel lanes for maximum ILP on ARM64
• Secrets are odd, prime, 32 bits set, pairwise hamming distance = 32

License

MIT License - Copyright 2025 ScaleCode Solutions