android-encrypted-archiver/.planning/phases/03-round-trip-verification/03-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
03-round-trip-verification	02	testing	golden-vectors integration-tests round-trip aes-256-cbc hmac-sha256 sha256 assert_cmd tempfile	phase plan provides 03-round-trip-verification 01 Library crate (src/lib.rs) with pub mod re-exports, dev-dependencies (assert_cmd, tempfile, hex-literal) phase provides 02-core-archiver crypto.rs, compression.rs, format.rs, archive.rs with pack/unpack CLI	7 golden test vectors for AES-256-CBC, HMAC-SHA256, and SHA-256 (deterministic, cross-verified) 6 CLI round-trip integration tests covering all Phase 3 edge cases 32 total tests (19 unit + 7 golden + 6 integration) all passing	phase-4-cli-polish phase-5-shell-decoder verification	added patterns golden-vector-testing-with-fixed-iv cli-integration-via-assert_cmd-cargo_bin-macro tempdir-isolation-for-parallel-tests	created modified tests/golden.rs tests/round_trip.rs	Corrected HMAC golden vector: research openssl pipe+xxd gave wrong value; verified with openssl file input and Python hmac module Used cargo_bin! macro instead of deprecated Command::cargo_bin() for forward compatibility Large file test uses 11MB deterministic pseudo-random data with --no-compress to avoid gzip non-determinism	Golden vector pattern: fixed IV + known KEY for deterministic crypto test output CLI integration pattern: tempdir + cargo_bin! + pack/unpack + assert_eq on raw bytes Edge case coverage: empty file (PKCS7), Cyrillic UTF-8 names, >10MB files, APK no-compress	INT-02 TST-01 TST-02	5min	2026-02-24

Phase 3 Plan 02: Golden Vectors and Round-Trip Tests Summary

7 golden crypto test vectors (AES-256-CBC, HMAC-SHA256, SHA-256) and 6 CLI round-trip integration tests covering empty files, Cyrillic filenames, and 11MB binaries

Performance

• Duration: 5 min
• Started: 2026-02-24T21:34:17Z
• Completed: 2026-02-24T21:39:45Z
• Tasks: 2
• Files created: 2

Accomplishments

• Created 7 golden test vectors with fixed IVs for deterministic crypto verification (TST-02)
• Created 6 CLI round-trip integration tests proving byte-identical pack->unpack (INT-02, TST-01)
• All 32 tests pass (19 unit + 7 golden + 6 integration) with zero warnings
• Cross-verified golden values with openssl (file input) and Python hmac module

Task Commits

Each task was committed atomically:

1. Task 1: Create golden test vectors with fixed IV/key - 329bed6 (test)
2. Task 2: Create CLI round-trip integration tests - 91ee354 (test)

Files Created/Modified

• tests/golden.rs - 7 golden vector tests: AES-256-CBC encrypt/decrypt/empty, HMAC-SHA256 compute/verify, SHA-256 x2
• tests/round_trip.rs - 6 CLI integration tests: single file, multiple files, empty, Cyrillic, 11MB large, APK no-compress

Decisions Made

• Corrected HMAC golden vector from research: openssl pipe with xxd -r -p produced incorrect binary, verified correct value (efa09db0...) using openssl with file input and Python hmac.new()
• Used cargo_bin! macro (non-deprecated) instead of Command::cargo_bin() to avoid deprecation warnings
• Large file test generates 11MB of deterministic pseudo-random data (i.wrapping_mul(2654435761) as u8) to ensure reproducibility

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Corrected HMAC-SHA256 golden vector value

• Found during: Task 1 (golden test vectors)
• Issue: Research openssl cross-verification produced wrong HMAC value (0c85780b...) due to pipe+xxd binary corruption; correct value is efa09db0...
• Fix: Computed correct value independently with Python hmac module and openssl file-based input, updated golden vector
• Files modified: tests/golden.rs
• Verification: All 7 golden tests pass; value matches Rust hmac crate, Python hmac, and openssl (file)
• Committed in: 329bed6 (Task 1 commit)

2. [Rule 1 - Bug] Replaced deprecated assert_cmd API

• Found during: Task 2 (round-trip tests)
• Issue: Command::cargo_bin() deprecated in assert_cmd 2.1 with warning about custom cargo build-dir incompatibility
• Fix: Used cargo_bin!("encrypted_archive") macro which resolves at compile time via CARGO_BIN_EXE_ env var
• Files modified: tests/round_trip.rs
• Verification: Zero deprecation warnings, all 6 round-trip tests pass
• Committed in: 91ee354 (Task 2 commit)

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Total deviations: 2 auto-fixed (2 bugs) Impact on plan: Both fixes necessary for correctness and clean builds. No scope change.

Issues Encountered

None

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Phase 3 fully complete: 32 tests (19 unit + 7 golden + 6 integration) all pass
• All Phase 3 success criteria met: byte-identical round-trips, golden vectors, unit tests, edge cases (empty, >10MB, Cyrillic)
• Ready for Phase 4 (CLI polish) or Phase 5 (shell decoder)

Self-Check: PASSED

• All 2 key files exist on disk: tests/golden.rs, tests/round_trip.rs
• Both task commits verified: 329bed6, 91ee354
• cargo test: 32 passed (19 unit + 7 golden + 6 integration), 0 failed

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Phase: 03-round-trip-verification Completed: 2026-02-24