docs(phase-1): complete phase execution
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NikitolProject
@@ -12,7 +12,7 @@ Build a custom encrypted archive format that standard tools cannot recognize or
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Decimal phases appear between their surrounding integers in numeric order.
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- [ ] **Phase 1: Format Specification** - Document the complete binary format before writing any code
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- [x] **Phase 1: Format Specification** - Document the complete binary format before writing any code (completed 2026-02-24)
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- [ ] **Phase 2: Core Archiver** - Rust CLI that compresses, encrypts, and packs files into the custom format
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- [ ] **Phase 3: Round-Trip Verification** - Rust unpack command + golden test vectors + unit tests proving byte-identical round-trips
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- [ ] **Phase 4: Kotlin Decoder** - Android 13 decoder using javax.crypto and java.util.zip (primary extraction path)
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@@ -114,7 +114,7 @@ Phases execute in numeric order: 1 -> 2 -> 3 -> 4 -> 5 -> 6
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| Phase | Plans Complete | Status | Completed |
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|-------|----------------|--------|-----------|
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| 1. Format Specification | 0/1 | Planned | - |
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| 1. Format Specification | 0/1 | Complete | 2026-02-24 |
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| 2. Core Archiver | 0/2 | Not started | - |
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| 3. Round-Trip Verification | 0/2 | Not started | - |
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| 4. Kotlin Decoder | 0/1 | Not started | - |
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93
.planning/phases/01-format-specification/01-VERIFICATION.md
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93
.planning/phases/01-format-specification/01-VERIFICATION.md
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---
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phase: 01-format-specification
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verified: 2026-02-24T21:15:00Z
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status: passed
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score: 6/6 must-haves verified
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re_verification: false
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---
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# Phase 1: Format Specification Verification Report
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**Phase Goal:** A complete, unambiguous binary format document that all three implementations can build against
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**Verified:** 2026-02-24T21:15:00Z
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**Status:** PASSED
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**Re-verification:** No -- initial verification
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## Goal Achievement
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### Observable Truths
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| # | Truth | Status | Evidence |
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|---|-------|--------|----------|
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| 1 | Format spec document exists at docs/FORMAT.md with complete byte-level definitions | VERIFIED | File exists, 1031 lines, 13 sections covering header (40 bytes, 8 fields with offsets), file table entry (11 fields with sizes/types/endianness), and data blocks |
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| 2 | Every binary structure (header, file table entry, data block) has a field table with offset, size, type, endianness, and description | VERIFIED | Header field table at lines 114-123 (8 rows, all columns present). File table entry field table at lines 145-157 (11 rows, all columns). Data block layout at Section 6 with ciphertext-only specification. |
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| 3 | Encryption parameters are fully specified: AES-256-CBC, IV storage, HMAC-SHA-256 scope (IV \|\| ciphertext), PKCS7 padding formula | VERIFIED | Section 7 (lines 211-293): AES-256-CBC with 32-byte key, 16-byte random IV per file. HMAC input explicitly defined as "IV (16 bytes) \|\| ciphertext (encrypted_size bytes)" in 3 locations (lines 275, 523, 565). PKCS7 formula with 8 examples (lines 260-267). No ambiguous phrases. |
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| 4 | A worked example shows a concrete 2-file archive with every byte annotated | VERIFIED | Section 12 (lines 468-681): 2 files (hello.txt, data.bin), 323-byte archive. Per-file pipeline walkthrough, field-by-field hex tables for both TOC entries, annotated hex dump of entire archive, shell decode walkthrough with exact dd commands. Real SHA-256 hashes verified against sha256sum. |
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| 5 | Obfuscation features (XOR headers, encrypted TOC, decoy padding) are fully specified with byte ranges and activation flags | VERIFIED | Section 9 (lines 319-387): XOR obfuscation with specific 8-byte key (0xA5 0x3C 0x96 0x0F 0xE1 0x7B 0x4D 0xC8), byte range 0x00-0x27, bootstrapping algorithm. TOC encryption with toc_iv, PKCS7, size tracking. Decoy padding with per-file padding_after field. All controlled by flags bits 1-3. No "see Phase 6" deferrals. |
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| 6 | Shell decoder reference functions (LE integer reading, HMAC verification) are included in appendix | VERIFIED | Section 13 (lines 814-1031): read_le_u16(), read_le_u32() with xxd and od fallbacks, read_hex(), verify_hmac(), decrypt_file(), verify_sha256(). Also includes Kotlin reference (decryptFileEntry, verifyHmac, decompressGzip, verifySha256) with full decode flow. |
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**Score:** 6/6 truths verified
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### Required Artifacts
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| Artifact | Expected | Status | Details |
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|----------|----------|--------|---------|
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| `docs/FORMAT.md` | Complete binary format specification, min 300 lines, contains "Archive Header" | VERIFIED | 1031 lines, "Archive Header" appears 2 times, all 13 sections present. No stubs or placeholders. |
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### Key Link Verification
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| From | To | Via | Status | Details |
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|------|-----|-----|--------|---------|
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| Header definition (Section 4) | Worked example (Section 12.5) | Offset consistency (0x00-0x27) | VERIFIED | All 8 header fields in the worked example table (lines 596-603) use the exact same offsets as the definition table (lines 116-123). Python script verified all field positions. |
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| File table entry definition (Section 5) | Worked example (Sections 12.6-12.7) | Field sizes match TOC entry byte count | VERIFIED | Entry 1: 2 + 9 + 4 + 4 + 4 + 4 + 16 + 32 + 32 + 1 + 2 = 110 bytes, offsets 0x28-0x95. Entry 2: 2 + 8 + 4 + 4 + 4 + 4 + 16 + 32 + 32 + 1 + 2 = 109 bytes, offsets 0x96-0x102. Both verified by Python script against every individual field offset. |
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| Shell walkthrough dd skip values | Archive byte offsets | Skip matches hex offset | VERIFIED | All 15 dd commands in Section 12.10 use skip values that exactly match the documented byte offsets (verified programmatically). |
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### Requirements Coverage
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| Requirement | Source Plan | Description | Status | Evidence |
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|-------------|------------|-------------|--------|----------|
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| FMT-05 | 01-01-PLAN.md | Format specification as a document (before implementation starts) | SATISFIED | `docs/FORMAT.md` created with 1031 lines before any code. Commits `fcd37f5` and `1c698fe` both confirmed in git log. REQUIREMENTS.md marks FMT-05 as Complete. |
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No orphaned requirements -- only FMT-05 is mapped to Phase 1 in the REQUIREMENTS.md traceability table.
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### Anti-Patterns Found
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| File | Line | Pattern | Severity | Impact |
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|------|------|---------|----------|--------|
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| `docs/FORMAT.md` | 653 | "representative placeholders" (in hex dump description) | Info | Expected and acceptable -- gzip and AES ciphertext are non-deterministic, so representative bytes are used. SHA-256 hashes are verified real values. No impact on spec unambiguity. |
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No TODO, FIXME, TBD, HACK, "see Phase 6", "coming soon", or "will be here" found anywhere in the document.
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### Human Verification Required
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### 1. Hex Dump Annotation Alignment
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**Test:** Read through the annotated hex dump (Section 12.9) and verify that each row's annotation correctly describes the bytes at that offset.
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**Expected:** Every annotation label matches the field at that byte position per the field tables in Sections 4-5.
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**Why human:** Visual alignment verification is difficult to automate given the formatted markdown table.
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### 2. Spec Standalone Comprehensibility
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**Test:** Give the spec to a developer unfamiliar with the project and ask them to implement a minimal header parser without asking questions.
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**Expected:** The developer can write a parser using only the information in the document.
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**Why human:** Assessing whether the document is unambiguous from a reader's perspective requires human judgment.
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### Gaps Summary
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No gaps found. All 6 observable truths are verified. The format specification document is complete, internally consistent, and unambiguous:
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- All binary structures have field tables with exact byte offsets, sizes, types, and endianness
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- SHA-256 hashes in the worked example are verified correct
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- All worked example offsets are internally consistent (verified by Python script tracing every field)
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- Shell decode dd skip values match documented offsets
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- HMAC input is explicitly defined in 3 locations with no ambiguity
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- PKCS7 formula has 8 worked examples
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- Obfuscation features are fully specified with no deferrals to Phase 6
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- Shell and Kotlin reference code included in appendix
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- No anti-pattern blockers or warnings
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- Commits `fcd37f5` and `1c698fe` confirmed in git history
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---
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_Verified: 2026-02-24T21:15:00Z_
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_Verifier: Claude (gsd-verifier)_
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