xah30
a070da0be9
Lays the foundation for sing-box mobile clients (Option B from
docs/sing-box.md): an independent Go module that speaks the AuraVPN wire
protocol byte-for-byte. Proof of equivalence is in KAT tests cross-loaded
from a Rust-side deterministic vector exporter.
- tools/export-kat (new Rust bin in workspace): captures a handshake +
derived keys + a sealed datagram record + a knock token using seeded
RNGs (rand::rngs::StdRng + ml-kem's *_deterministic public API), emits
JSON. Reproducible byte-for-byte.
- singbox-aura/ (new Go module, ~3000 LOC, 22 files):
- aura/frame: 5-byte protocol header + Frame{Data,Ping,Pong,Close,
Control} + magic envelope (0xAA,0xAA,0xC0,0x01) — encode/decode
matching aura-proto::frame.
- aura/crypto: hybrid X25519 + ML-KEM-768 (stdlib crypto/ecdh +
crypto/mlkem on Go 1.24+; falls back to circl on older Go via a
documented swap), HKDF-SHA256 derive_session_keys, ChaCha20-Poly1305
with the **LE(u64 counter) || [0;4]** nonce scheme that matches
aura-crypto::AeadKey/AeadSession.
- aura/handshake: client_handshake state machine reproducing protocol.md
§6.2 exactly (CH→SH→ServerAuth→ClientAuth→Finished×2; transcript hash;
ECDSA-P256 transcript signature; HMAC-SHA256 Finished).
- aura/session: DatagramSender/Receiver + 64-wide sliding replay window.
- aura/transport: reliable HS-adapter (DTLS-flight retransmit) + UDP
datagram data path + 16-byte HMAC port-knock with ±1-minute window.
- aura/outbound: sing-box-shaped shim (interface signatures only — sing-
box upstream registration is one more step, documented in README).
- cmd/aura-client: standalone Go binary; reads client.toml via
pelletier/go-toml/v2 and connects to a real aura server. Validates
end-to-end interop with the Rust side.
- KAT: 6 comparisons against Rust vectors — session_keys (HKDF), hybrid
KEM ek/encaps roundtrip, c2s + s2c Finished HMAC, sealed datagram
record at seq=2 (incl. 16-byte Poly1305 tag), knock token. All byte-
for-byte.
Go: 29 tests across 5 packages, all green. Only deps: golang.org/x/crypto
and pelletier/go-toml/v2. Rust: 293 tests still green; tools/export-kat
added to workspace members.
v1 limits documented in singbox-aura/README.md: UDP-only (no TCP/QUIC
fallback yet), no cell padding / cover traffic, no relay/exit role, no
multi-hop, sing-box upstream-registration sketch (vendor sagernet/sing-box +
init() RegisterOutbound) for follow-up.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
31 lines
805 B
TOML
31 lines
805 B
TOML
[package]
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name = "export-kat"
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version.workspace = true
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edition.workspace = true
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license.workspace = true
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description = "Export deterministic known-answer-test vectors for the Aura handshake / AEAD / knock"
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[[bin]]
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name = "export-kat"
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path = "src/main.rs"
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[dependencies]
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aura-crypto.workspace = true
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aura-proto.workspace = true
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aura-pki.workspace = true
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# Crypto primitives — we need their direct surface to run a deterministic exchange that bypasses
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# the OS RNG (the production helpers use thread_rng / OsRng).
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ml-kem = { workspace = true }
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x25519-dalek = { workspace = true }
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hkdf.workspace = true
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hmac.workspace = true
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sha2.workspace = true
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chacha20poly1305.workspace = true
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# Misc
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hex.workspace = true
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anyhow.workspace = true
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serde = { workspace = true, features = ["derive"] }
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serde_json = "1"
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