NikitolProject/android-encrypted-archiver

Files

NikitolProject 3cb6512157 docs(01-01): complete format specification plan

- SUMMARY.md with execution metrics and self-check
- STATE.md updated: Phase 1 complete, decisions logged
- ROADMAP.md updated: Phase 1 progress 1/1
- REQUIREMENTS.md: FMT-05 marked complete

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-24 23:24:33 +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 1: Format Specification

Current Position

Phase: 1 of 6 (Format Specification) -- COMPLETE Plan: 1 of 1 in current phase Status: Phase 1 complete, ready for Phase 2 Last activity: 2026-02-24 -- Format specification written

Progress: [█░░░░░░░░░] 12%

Performance Metrics

Velocity:

Total plans completed: 1
Average duration: 7 min
Total execution time: 0.1 hours

By Phase:

Phase	Plans	Total	Avg/Plan
1. Format Specification	1	7 min	7 min

Recent Trend:

Last 5 plans: 7min
Trend: baseline

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)

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 01-01-PLAN.md (Format Specification) Resume file: None

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