71 lines
2.7 KiB
Rust
71 lines
2.7 KiB
Rust
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// External SHA-256 oracle cross-check для mt-lottery composite hashes.
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// Pass 25 (Independent Oracle / Differential Check) per CRITIC.md.
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//
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// Текущие unit tests cross-check `domain::X` constants против литералов
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// `b"mt-X"` через SAME Rust SHA-256 implementation (sha2 crate via
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// mt-crypto). Это circular validation — обе стороны равенства идут от
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// одной реализации.
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//
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// Этот test cross-checks output mt-crypto::hash() против hardcoded hex
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// digests computed via Python `hashlib.sha256` (CPython OpenSSL binding) —
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// независимая reference implementation. Mismatch = либо Rust impl drift,
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// либо Python impl drift (extremely unlikely для standard primitive),
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// либо domain registry changed без oracle update.
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//
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// Reproduce oracle outputs:
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// python3 scripts/oracle_python_sha256.py
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//
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// При изменении доменов / formula / NUL pattern — обновить oracle script
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// и эти hardcoded values в одном commit.
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use mt_lottery::compute_endpoint;
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use mt_state::NodeId;
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fn fixed(byte: u8, len: usize) -> Vec<u8> {
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vec![byte; len]
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}
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#[test]
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fn oracle_compute_endpoint_matches_python_hashlib() {
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// Inputs: t_r = [0x11; 32], cba = [0x22; 32], node_id = [0x33; 32], w = 7.
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let t_r: [u8; 32] = fixed(0x11, 32).try_into().unwrap();
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let cba: [u8; 32] = fixed(0x22, 32).try_into().unwrap();
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let node_id: NodeId = fixed(0x33, 32).try_into().unwrap();
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let w: u64 = 7;
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// Expected from python3 scripts/oracle_python_sha256.py (spec v33.1.5+
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// window_index u64 LE 8B, был u32 LE 4B до v33.1.5):
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// compute_endpoint(t_r=11..,cba=22..,node_id=33..,w=7)
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// = c9845c571dc52459c433aa6df1d16f9456ec526195105972a671eb172866751a
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let expected_hex = "c9845c571dc52459c433aa6df1d16f9456ec526195105972a671eb172866751a";
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let expected: [u8; 32] = hex_to_bytes(expected_hex);
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let actual = compute_endpoint(&t_r, &cba, &node_id, w);
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assert_eq!(
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actual,
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expected,
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"compute_endpoint output расходится с Python hashlib oracle.\n\
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Ожидалось: {}\n\
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Получено: {}\n\
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Если изменения intentional — обновить oracle script и hex.",
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expected_hex,
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bytes_to_hex(&actual)
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);
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}
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fn hex_to_bytes(s: &str) -> [u8; 32] {
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let mut out = [0u8; 32];
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for i in 0..32 {
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out[i] = u8::from_str_radix(&s[i * 2..i * 2 + 2], 16).expect("invalid hex");
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}
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out
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}
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fn bytes_to_hex(b: &[u8; 32]) -> String {
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let mut s = String::with_capacity(64);
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for byte in b.iter() {
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s.push_str(&format!("{byte:02x}"));
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}
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s
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}
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