NikitolProject/android-encrypted-archiver

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NikitolProject d6bc92ee48 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>

2026-02-25 00:00:19 +03:00

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Project State

Project Reference

See: .planning/PROJECT.md (updated 2026-02-24)

Core value: Archive impossible to unpack without knowing the format -- standard tools (7z, tar, unzip, binwalk) cannot recognize or extract contents Current focus: Phase 2: Core Archiver

Current Position

Phase: 2 of 6 (Core Archiver) -- IN PROGRESS Plan: 1 of 2 in current phase -- COMPLETE Status: Plan 02-01 complete, ready for Plan 02-02 Last activity: 2026-02-24 -- Project foundation with crypto pipeline

Progress: [██░░░░░░░░] 25%

Performance Metrics

Velocity:

Total plans completed: 2
Average duration: 5.5 min
Total execution time: 0.2 hours

By Phase:

Phase	Plans	Total	Avg/Plan
1. Format Specification	1	7 min	7 min
2. Core Archiver	1/2	4 min	4 min

Recent Trend:

Last 5 plans: 7min, 4min
Trend: improving

Updated after each plan completion

Accumulated Context

Decisions

Decisions are logged in PROJECT.md Key Decisions table. Recent decisions affecting current work:

Roadmap: Format spec must precede all implementation (all three decoders build against same spec)
Roadmap: Obfuscation (XOR headers, encrypted TOC, decoy padding) deferred to Phase 6 after all decoders work without it
Phase 1: IV stored only in TOC, not duplicated in data blocks (simplifies shell dd extraction)
Phase 1: Same 32-byte key for AES-256-CBC and HMAC-SHA-256 in v1 (v2 will use HKDF)
Phase 1: Magic bytes 0x00 0xEA 0x72 0x63 (leading null signals binary)
Phase 1: HMAC scope = IV (16 bytes) || ciphertext (encrypted_size bytes)
Phase 2: Used rand::Fill::fill() for IV generation (correct rand 0.9 API)
Phase 2: Manual binary serialization with to_le_bytes/from_le_bytes (no serde/bincode)

Pending Todos

None yet.

Blockers/Concerns

Open question: Does target busybox have openssl enc -aes-256-cbc with -K/-iv flags? (affects Phase 5)
Open question: Is xxd available in target busybox? Fallback: od (affects Phase 5; spec includes od fallback functions)
RESOLVED: HMAC uses same key as AES in v1 (decided in Phase 1 spec, v2 will use HKDF)

Session Continuity

Last session: 2026-02-24 Stopped at: Completed 02-01-PLAN.md (Project foundation with crypto pipeline) Resume file: None

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