# 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 encoding |
| `sha2` | 0.10 | Certificate fingerprinting |
| `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 |