Crate mod_rand 

mod-rand

Tiered random number generation for Rust. Zero dependencies. Pick the tier appropriate to your threat model.

Tiers

• tier1: Deterministic seedable PRNG (xoshiro256**). For simulation, fixture data, non-security shuffling. Always available, works in no_std.
• tier2: Process-unique seeds derived from PID + time + counter. For tempdir names, request IDs, log correlation. Fast enough for high-frequency use. Not cryptographic.
• tier3: OS-backed cryptographic random. For tokens, keys, session IDs. Calls platform syscalls directly.

Quick example

use mod_rand::tier1::Xoshiro256;

let mut rng = Xoshiro256::seed_from_u64(42);
let n: u64 = rng.next_u64();

Choosing a tier

Use case	Tier
Test fixtures, simulation	1
Tempdir names, request IDs	2
Auth tokens, session IDs, keys	3

Status

v0.1.0 is a placeholder release. Real implementation lands in 0.9.x. See the CHANGELOG for what’s stable.

Modules

tier1

Tier 1 — Fast deterministic PRNG

tier2tier2

Tier 2 — Process-unique seeds

tier3tier3

Tier 3 — OS-backed cryptographic random