docs(02-01): complete project foundation plan
- Create 02-01-SUMMARY.md with execution results and deviations - Update STATE.md: Phase 2 in progress, plan 1/2 complete - Update ROADMAP.md: Phase 2 progress 1/2 - Mark 13 requirements complete: FMT-01..04, ENC-01..05, CMP-01..02, INT-01, CLI-01 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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NikitolProject
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---
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phase: 02-core-archiver
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plan: 01
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subsystem: crypto, format, cli
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tags: [aes-256-cbc, hmac-sha256, gzip, clap, flate2, pkcs7, binary-format]
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# Dependency graph
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requires:
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- phase: 01-format-spec
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provides: "FORMAT.md binary format specification (byte-level field definitions)"
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provides:
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- "Rust project with Cargo.toml and all crypto/compression/format dependencies"
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- "CLI skeleton with pack/unpack/inspect subcommands (clap derive)"
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- "Binary format types (Header, TocEntry) with serialize/deserialize matching FORMAT.md"
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- "AES-256-CBC encrypt/decrypt pipeline with PKCS7 padding"
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- "HMAC-SHA-256 compute/verify (encrypt-then-MAC over IV||ciphertext)"
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- "SHA-256 hash for file integrity verification"
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- "Gzip compress/decompress with deterministic mtime(0)"
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- "Compression heuristic for known compressed file extensions"
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- "Hardcoded 32-byte AES key constant"
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affects: [02-core-archiver, 03-round-trip-verification]
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# Tech tracking
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tech-stack:
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added: [aes 0.8, cbc 0.1, hmac 0.12, sha2 0.10, flate2 1.1, clap 4.5, rand 0.9, anyhow 1.0]
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patterns: [manual binary serialization with to_le_bytes/from_le_bytes, RustCrypto type aliases for cipher modes, GzBuilder mtime(0) for reproducibility]
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key-files:
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created:
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- Cargo.toml
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- src/main.rs
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- src/cli.rs
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- src/key.rs
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- src/format.rs
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- src/crypto.rs
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- src/compression.rs
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- src/archive.rs
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modified: []
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key-decisions:
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- "Used rand::Fill::fill() instead of try_fill() for IV generation (correct rand 0.9 API)"
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- "Edition 2021 to match plan specification"
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- "Dead-code warnings expected and acceptable until pack/unpack/inspect wire up modules in Plan 02-02"
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patterns-established:
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- "Type aliases for cipher modes: type Aes256CbcEnc = cbc::Encryptor<aes::Aes256>"
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- "Manual binary serialization: to_le_bytes()/from_le_bytes() for all multi-byte fields"
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- "HMAC-SHA-256 scope: IV (16 bytes) || ciphertext (encrypted_size bytes)"
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- "Compression heuristic: extension-based auto-detection + CLI override via --no-compress"
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- "GzBuilder::new().mtime(0) for deterministic gzip output"
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requirements-completed: [FMT-01, FMT-02, FMT-03, FMT-04, ENC-01, ENC-02, ENC-03, ENC-04, ENC-05, CMP-01, CMP-02, INT-01, CLI-01]
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# Metrics
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duration: 4min
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completed: 2026-02-24
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---
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# Phase 2 Plan 1: Project Foundation Summary
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**Rust project with AES-256-CBC/HMAC-SHA-256 crypto pipeline, binary format serialization matching FORMAT.md, gzip compression, and clap CLI skeleton**
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## Performance
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- **Duration:** 4 min
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- **Started:** 2026-02-24T20:54:36Z
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- **Completed:** 2026-02-24T20:58:28Z
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- **Tasks:** 2
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- **Files modified:** 8
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## Accomplishments
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- Complete Rust project structure with 7 source modules and all dependencies
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- Binary format types (Header: 40 bytes, TocEntry: 101+N bytes) with byte-accurate serialization matching FORMAT.md Sections 4 and 5
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- Full crypto pipeline: AES-256-CBC encrypt/decrypt, HMAC-SHA-256 compute/verify, SHA-256 hash, random IV generation
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- Gzip compression/decompression with reproducible output and smart compression heuristic
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Project scaffolding with Cargo, CLI skeleton, and key module** - `c647f3a` (feat)
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2. **Task 2: Format types, crypto pipeline, and compression module** - `6292b41` (feat)
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## Files Created/Modified
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- `Cargo.toml` - Project manifest with aes, cbc, hmac, sha2, flate2, clap, rand, anyhow
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- `src/main.rs` - CLI entry point with clap parse and dispatch to pack/unpack/inspect
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- `src/cli.rs` - Clap derive structs: Cli, Commands enum (Pack/Unpack/Inspect)
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- `src/key.rs` - Hardcoded 32-byte AES-256 key constant
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- `src/format.rs` - Header and TocEntry structs with write/read serialization, entry_size, compute_toc_size
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- `src/crypto.rs` - encrypt_data, decrypt_data, compute_hmac, verify_hmac, sha256_hash, generate_iv
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- `src/compression.rs` - compress, decompress, should_compress
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- `src/archive.rs` - Stub module for pack/unpack/inspect orchestration (Plan 02-02)
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## Decisions Made
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- Used `rand::Fill::fill()` instead of `try_fill()` for IV generation (correct rand 0.9 API for array fill)
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- Kept edition 2021 as specified in the plan for broad compatibility
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- Dead-code warnings are expected and acceptable -- modules are not yet called from main; they will be wired in Plan 02-02
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 3 - Blocking] Fixed rand 0.9 API for IV generation**
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- **Found during:** Task 2 (crypto.rs implementation)
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- **Issue:** `try_fill()` method does not exist on `[u8; 16]` in rand 0.9. The `Fill` trait provides `fill()`, not `try_fill()`.
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- **Fix:** Changed from `iv.try_fill(&mut rand::rng())` to `rand::Fill::fill(&mut iv, &mut rand::rng())`
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- **Files modified:** src/crypto.rs
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- **Verification:** cargo build succeeds
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- **Committed in:** 6292b41 (Task 2 commit)
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---
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**Total deviations:** 1 auto-fixed (1 blocking)
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**Impact on plan:** Minor API correction for rand 0.9. No scope creep.
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## Issues Encountered
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None beyond the rand API correction noted above.
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- All building-block modules are implemented and compile successfully
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- Ready for Plan 02-02: Pack, inspect, and unpack commands with full archive orchestration
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- The archive.rs module is a stub awaiting the orchestration logic
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- 25 dead-code warnings will be resolved when modules are wired into commands
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## Self-Check: PASSED
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All 8 created files verified present. Both task commits (c647f3a, 6292b41) verified in git log.
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---
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*Phase: 02-core-archiver*
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*Completed: 2026-02-24*
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