rand_chacha 0.9.0: rand_chacha::ChaCha20Rng, rand_chacha::ChaCha12Rng, rand_chacha::ChaCha8Rng

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Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:cargo/rand_chacha@0.9.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/rand_chacha@0.9.0

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:536b4af1d64ff8696095c91b93d779599fb1fe75f0ba66a9c5ecd59aa5ee7c12","contract":["assert ChaCha20Rng::from_seed produces deterministic output matching ChaCha20 reference vector","assert ChaCha20Rng::set_stream and set_word_pos control stream and offset positions","assert ChaCha20Rng::fill_bytes populates destination slice via RngCore","assert ChaCha12Rng and ChaCha8Rng construct from u64 seed and generate random u64 values","assert ChaChaRng is an alias of ChaCha20Rng with identical behavior"],"goal":"verify pkg:cargo/rand_chacha@0.9.0","kind":"HOW","packages":["pkg:cargo/rand_chacha@0.9.0"],"schemaVersion":1,"symbols":["rand_chacha::ChaCha20Rng","rand_chacha::ChaCha12Rng","rand_chacha::ChaCha8Rng","rand_chacha::ChaChaRng"]},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/rand_chacha@0.9.0"],"schemaVersion":1,"subject":"pkg:cargo/rand_chacha@0.9.0","symbols":["rand_chacha::ChaCha20Rng","rand_chacha::ChaCha12Rng","rand_chacha::ChaCha8Rng","rand_chacha::ChaChaRng"],"verifierAdapter":"cargo@1"}

{
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  "goal": "verify pkg:cargo/rand_chacha@0.9.0",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/rand_chacha@0.9.0"
  ],
  "symbols": [
    "rand_chacha::ChaCha20Rng",
    "rand_chacha::ChaCha12Rng",
    "rand_chacha::ChaCha8Rng",
    "rand_chacha::ChaChaRng"
  ]
}

use rand_chacha::rand_core::{RngCore, SeedableRng};
use rand_chacha::{ChaCha12Rng, ChaCha20Rng, ChaCha8Rng, ChaChaRng};

fn main() {
    // 1. Deterministic generation with ChaCha20Rng from a 32-byte seed
    let seed = [0u8; 32];
    let mut rng20 = ChaCha20Rng::from_seed(seed);
    assert_eq!(rng20.get_seed(), seed);
    let val1 = rng20.next_u32();
    assert_eq!(val1, 0xade0b876, "ChaCha20 first word must match reference vector");

    // 2. Stream and word position control
    rng20.set_stream(100);
    assert_eq!(rng20.get_stream(), 100);
    rng20.set_word_pos(32);
    assert_eq!(rng20.get_word_pos(), 32);

    // 3. Buffer filling via RngCore::fill_bytes
    let mut buf = [0u8; 16];
    rng20.fill_bytes(&mut buf);
    assert_ne!(buf, [0u8; 16], "fill_bytes should populate non-zero random bytes");

    // 4. ChaCha12Rng and ChaCha8Rng seeding and u64 generation
    let mut rng12 = ChaCha12Rng::seed_from_u64(999);
    let val12 = rng12.next_u64();
    assert_ne!(val12, 0);

    let mut rng8 = ChaCha8Rng::seed_from_u64(999);
    let val8 = rng8.next_u64();
    assert_ne!(val8, 0);

    // 5. Verify ChaChaRng type alias equivalence to ChaCha20Rng
    let mut alias_rng: ChaChaRng = ChaChaRng::from_seed(seed);
    assert_eq!(alias_rng.next_u32(), 0xade0b876);

    println!("All contract assertions passed successfully.");
}