Ejemplo

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

Muestra verificada para cargo rand_chacha 0.9.0: rand_chacha::ChaCha20Rng, rand_chacha::ChaCha12Rng, rand_chacha::ChaCha8Rng. El contrato se ejecutó en rust…

sha256:2e36dc83459bfec693baadca3e50c302d74f107e6ab0b251a31aa6cbb9e5ed08

MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia: Contrato firmado aprobado
Recibos de verificación: 1
Claves de firma que lo compilaron: 1

Entorno declarado linux · musl x64 cargo

Entornos de las ejecuciones de verificación

Entorno	Contrato	Etapas	Ejecución
rust 1 · linux alpine/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1rust:1-alpine@sha256:a10e64dd139b…	2026-09-19

Caso

HOW

Objetivo: verify pkg:cargo/rand_chacha@0.9.0
Paquetes: rand_chacha 0.9.0
Símbolos: rand_chacha::ChaCha20Rng
rand_chacha::ChaCha12Rng
rand_chacha::ChaCha8Rng
rand_chacha::ChaChaRng
Creado: 2026-09-19T02:57:54Z

Contrato

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

Archivos

Cargo.lock
Cargo.toml
PROMPT.md
csx.json
spec.json
src/main.rs

Descargar el artefacto de código fuente (tar.gz)

Código fuente

Cargo.lock

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4

[[package]]
name = "cfg-if"
version = "1.0.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4e7648175b45a9a48536d676f68d918270699102aa8dab5496df06904c914600"

[[package]]
name = "getrandom"
version = "0.3.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
dependencies = [
 "cfg-if",
 "libc",
 "r-efi",
 "wasip2",
]

[[package]]
name = "libc"
version = "0.2.189"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3eaf3ede3fee6db1a4c2ee091bf8a8b4dccdc6d17f656fb07896ee72867612f2"

[[package]]
name = "ppv-lite86"
version = "0.2.21"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "85eae3c4ed2f50dcfe72643da4befc30deadb458a9b590d720cde2f2b1e97da9"
dependencies = [
 "zerocopy",
]

[[package]]
name = "proc-macro2"
version = "1.0.107"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "985e7ec9bb745e6ce6535b544d84d6cd6f7ad8bd711c398938ae983b91a766d9"
dependencies = [
 "unicode-ident",
]

[[package]]
name = "quote"
version = "1.0.47"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1fbf4db142a473a8d80c26bbf18454ed458bf8d26c8219c331daecfdbd079001"
dependencies = [
 "proc-macro2",
]

[[package]]
name = "r-efi"
version = "5.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"

[[package]]
name = "rand_chacha"
version = "0.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
dependencies = [
 "ppv-lite86",
 "rand_core",
]

[[package]]
name = "rand_core"
version = "0.9.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "76afc826de14238e6e8c374ddcc1fa19e374fd8dd986b0d2af0d02377261d83c"
dependencies = [
 "getrandom",
]

[[package]]
name = "sample"
version = "0.1.0"
dependencies = [
 "rand_chacha",
]

[[package]]
name = "syn"
version = "2.0.119"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "872831b642d1a07999a962a351ed35b955ea2cfc8f3862091e2a240a84f17297"
dependencies = [
 "proc-macro2",
 "quote",
 "unicode-ident",
]

[[package]]
name = "unicode-ident"
version = "1.0.26"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d245f478577f809a851594d02313b640fb437e0bb33866753cff937863096954"

[[package]]
name = "wasip2"
version = "1.0.4+wasi-0.2.12"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b67efb37e106e55ce722a510d6b5f9c17f083e5fc79afc2badeb12cc313d9487"
dependencies = [
 "wit-bindgen",
]

[[package]]
name = "wit-bindgen"
version = "0.57.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1ebf944e87a7c253233ad6766e082e3cd714b5d03812acc24c318f549614536e"

[[package]]
name = "zerocopy"
version = "0.8.57"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d35102a9f36d089ccae9e4c6802bc118be4487b80aaffc0ab4e0cf5ce92d2873"
dependencies = [
 "zerocopy-derive",
]

[[package]]
name = "zerocopy-derive"
version = "0.8.57"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "146c01f5ab44258da43cf276c74a2763db2ff3969c9c652c3f2de07041d0b2bc"
dependencies = [
 "proc-macro2",
 "quote",
 "syn",
]

Cargo.toml

[package]
name = "sample"
version = "0.1.0"
edition = "2021"

[dependencies]
rand_chacha = "=0.9.0"

PROMPT.md

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.

csx.json

{"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"}

spec.json

{
  "schemaVersion": 1,
  "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"
  ]
}

src/main.rs

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.");
}

Seeder de origen

anónimo