36a59cd564
Mechanical renames only; no content changes. Tracked as renames so git blame / git log --follow survive intact. - ARCHITECTURE.md → DESIGN.md (top-level system tour) - docs/ARCHITECTURE.md → docs/CRYPTO.md (crypto pipeline) - FORMATS.md → docs/FORMATS.md (wire formats; aligns with docs/ layout) Spec: docs/superpowers/specs/2026-05-30-doc-structure-redesign-design.md
103 lines
5.0 KiB
Markdown
103 lines
5.0 KiB
Markdown
# Relicario Wire Formats
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> Quick-reference for the load-bearing binary and JSON formats. Check this file before touching serialization, versioning, or storage layout code. Full diagrams and invariants live in the per-crate `ARCHITECTURE.md` files.
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## Encrypted blob (`.enc` files)
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Every encrypted file — `manifest.enc`, `settings.enc`, `items/<id>.enc`, `attachments/<item-id>/<aid>.enc` — uses the layout produced by `relicario_core::crypto::encrypt` (`crypto.rs`):
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```
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┌─────────┬────────────────────────┬──────────────────┬──────────────────┐
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│ version │ nonce │ ciphertext │ auth tag │
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│ 1 byte │ 24 bytes │ N bytes │ 16 bytes │
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│ 0x02 │ random per write │ XChaCha20 stream │ Poly1305 MAC │
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└─────────┴────────────────────────┴──────────────────┴──────────────────┘
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```
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- `VERSION_BYTE = 0x02` (`crypto.rs:59`). Any blob starting with `0x01` is rejected with `UnsupportedFormatVersion { found: 0x01, expected: 0x02 }`.
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- Minimum valid blob length: 41 bytes (1 + 24 + 0 + 16).
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- Nonces are always fresh from `OsRng` — no caller-supplied nonces.
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- Full diagram: `docs/ARCHITECTURE.md` § "Encrypted File Format".
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## `.relicario/params.json`
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```json
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{
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"format_version": 2,
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"aead": "xchacha20-poly1305",
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"salt_path": ".relicario/salt",
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"kdf": {
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"argon2_m": 65536,
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"argon2_t": 3,
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"argon2_p": 4
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}
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}
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```
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Parsed via `ParamsFile { kdf: KdfParams }` in `session.rs`. The `kdf` nesting is intentional — `format_version`, `aead`, and `salt_path` co-exist for forward-compat probing. Do not flatten. Production defaults: `m=65536` (64 MiB), `t=3`, `p=4`. Tests use `m=256, t=1, p=1`.
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## `.relicario/salt`
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32 raw bytes. Not secret. Generated once at vault init via `OsRng`. Feeds Argon2id as the KDF salt.
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## Manifest (`manifest.enc`)
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Decrypts to JSON matching the `Manifest` struct (`manifest.rs`).
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- **Schema version:** `MANIFEST_SCHEMA_VERSION = 2` (`manifest.rs:12`). v1 manifests (pre-typed-items) fail to parse and are not supported.
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- **`ManifestEntry` fields** (declared order in `manifest.rs:21-38`): `id`, `type`, `title`, `tags`, `favorite`, `group`, `icon_hint`, `modified`, `trashed_at`, `attachment_summaries`. The `type` field is `r#type: ItemType` in Rust but serializes as the bare JSON key `"type"` (no serde rename — `r#` is just the raw-identifier escape). `group`, `icon_hint`, and `trashed_at` are `#[serde(skip_serializing_if = "Option::is_none")]`; `tags`, `favorite`, and `attachment_summaries` use `#[serde(default)]`.
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- The manifest is rebuilt from scratch on every `upsert` — it can never drift from the source-of-truth item files.
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- Supports case-insensitive title/tag search without decrypting any item.
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## `.relicario/devices.json`
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```json
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[
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{ "name": "laptop", "public_key": "<hex-encoded ed25519 public key>" }
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]
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```
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An empty array (`[]`) puts the pre-receive hook in bootstrap mode (all pushes accepted). Both `devices.json` and `revoked.json` must be empty for bootstrap mode to activate — a non-empty `revoked.json` alone forces strict verification.
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## `.relicario/revoked.json`
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```json
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[
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{ "name": "old-laptop", "public_key": "<hex>", "revoked_at": 1746000000 }
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]
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```
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Commits by `public_key` at or after `revoked_at` (Unix seconds) are rejected by the pre-receive hook. Commits before `revoked_at` remain valid (they were authorized at the time).
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## Item IDs and Field IDs
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| Kind | Length | Entropy | Source |
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|---|---|---|---|
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| `ItemId` | 16 hex chars | 64 bits | `OsRng` |
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| `FieldId` | 16 hex chars | 64 bits | `OsRng` |
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| `AttachmentId` | 32 hex chars | 128 bits | first 16 bytes (32 hex chars) of `SHA-256` over the plaintext |
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`AttachmentId` is content-addressed — identical plaintexts deduplicate in git automatically. The 128-bit truncation (`ids.rs:59-69`) was widened from 64 bits per audit I2/B4 to put birthday-collision risk out of reach.
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## `.relbak` backup format
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A zstd-compressed tar archive containing a bare git clone of the vault. Designed for `relicario backup export/restore`.
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Full spec: `docs/superpowers/specs/2026-04-27-relicario-import-export-design.md`.
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## `ItemCore` JSON (internal)
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`ItemCore` uses `#[serde(tag = "type")]` — the outer JSON object gets a `"type"` discriminator key. No `*Core` struct may have a field named `"type"` (use `"kind"` instead — see `CardKind`, `TotpKind`).
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Full item type inventory: `crates/relicario-core/ARCHITECTURE.md` § "Module map".
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## KDF input construction
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The password fed to Argon2id is length-prefixed to prevent extension attacks:
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```
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u64_be(len(passphrase)) || passphrase_bytes || u64_be(32) || image_secret
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```
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NFC-normalized before hashing. Covered in `crypto.rs:229-236` and tested in `tests/format_v2.rs:44-54`.
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