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feat: replace connection keys with short seed-derived rtun3 keys
Connection keys are now a ~49-char seed (rtun3.) instead of a bundled
~1740-char certificate blob. Both endpoints deterministically derive an
identical Ed25519 CA from the seed and mint ephemeral server/client leaves
at startup (keyderive.rs); the app-layer auth token is derived from the seed.
Target is passed separately on connect (resocks-style).

- connkey.rs: rtun3 seed parse/format
- keyderive.rs: CA/server/client/token derivation
- keygen takes no args; connect requires --target
- remove miniz_oxide; TLS layer unchanged
- add determinism + key-based e2e + wrong-seed-rejected tests
- update wiki, README, design spec, CI smoke
2026-08-02 12:31:53 -06:00

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# Dependencies
## Runtime dependencies
| Crate | Version | Purpose |
| ----- | ------- | ------- |
| `clap` | 4 | CLI parsing with derive macros |
| `tokio` | 1 | Async runtime (full features) |
| `tokio-util` | 0.7 | I/O utilities |
| `tracing` | 0.1 | Structured logging |
| `tracing-subscriber` | 0.3 | Log formatting with env-filter |
| `anyhow` | 1 | Application error handling |
| `thiserror` | 1 | Library error enums |
| `serde` | 1 | Serialization (derive) |
| `serde_json` | 1 | JSON encoding/decoding |
| `rcgen` | 0.14 | Certificate generation |
| `x509-parser` | 0.16 | Certificate parsing for identity validation |
| `time` | 0.3 | Date/time formatting for certificate validity |
| `rand` | 0.8 | Random token generation |
| `hex` | 0.4 | Hex encoding for auth tokens |
| `rustls` | 0.23 | TLS implementation (ring provider) |
| `rustls-pki-types` | 1 | rustls type definitions |
| `rustls-pemfile` | 2 | PEM parsing for certificates and keys |
| `tokio-rustls` | 0.26 | Tokio integration for rustls |
| `hyper` | 1 | HTTP types (used for auth handshake) |
| `hyper-util` | 0.1 | HTTP utilities |
| `http-body-util` | 0.1 | HTTP body utilities |
| `tower-service` | 0.3 | Service trait (Hyper ecosystem) |
| `base64` | 0.22 | Connection key seed encoding |
| `sha2` | 0.10 | Auth-token derivation from the seed |
| `bytes` | 1 | Byte buffers for framing |
| `futures` | 0.3 | Future utilities |
| `url` | 2 | URL parsing |
## Dev dependencies
| Crate | Version | Purpose |
| ----- | ------- | ------- |
| `tempfile` | 3 | Temporary directories for tests |
## Key source files
| File | Purpose |
| ---- | ------- |
| `Cargo.toml` | Dependency declarations and features |