android-encrypted-archiver/.planning/phases/03-round-trip-verification/03-01-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	01	testing	unit-tests crypto compression format hex-literal aes-256-cbc hmac-sha256 sha256 gzip	phase provides 02-core-archiver crypto.rs, compression.rs, format.rs modules with full pipeline	Library crate (src/lib.rs) re-exporting all modules for integration tests 19 unit tests covering crypto, compression, and format serialization Dev-dependencies: tempfile, assert_cmd, hex-literal, predicates	03-02 integration-tests round-trip-verification	added patterns hex-literal 1.1 tempfile 3.26 assert_cmd 2.1 predicates 3.1 library-crate-reexports cfg-test-modules hex-literal-for-known-values	created modified src/lib.rs src/main.rs src/crypto.rs src/compression.rs src/format.rs Cargo.toml	Library crate with pub mod re-exports for all 6 modules (archive, cli, compression, crypto, format, key) hex-literal v1.1 for compile-time hex byte arrays in SHA-256 test assertions Unit tests embedded in modules via #[cfg(test)] mod tests blocks (not separate test files)	Library crate pattern: src/lib.rs re-exports, main.rs uses encrypted_archive:: imports Test pattern: #[cfg(test)] mod tests with use super::* inside each module SHA-256 verification against known values from FORMAT.md worked example	TST-03	3min	2026-02-24

Phase 3 Plan 01: Library Crate and Unit Tests Summary

Library crate structure with 19 unit tests covering AES-256-CBC encrypt/decrypt, HMAC-SHA256, SHA-256, gzip compression, and format serialization round-trips

Performance

• Duration: 3 min
• Started: 2026-02-24T21:28:18Z
• Completed: 2026-02-24T21:31:08Z
• Tasks: 2
• Files modified: 6

Accomplishments

• Created library crate (src/lib.rs) enabling integration tests in tests/ directory for Plan 02
• Added 19 unit tests across 3 modules all passing: crypto (6), compression (6), format (7)
• Verified SHA-256 known values match FORMAT.md Section 12.3 worked example
• Verified TOC entry size calculation matches FORMAT.md worked example (110 + 109 = 219 bytes)

Task Commits

Each task was committed atomically:

1. Task 1: Create lib.rs, update main.rs imports, add dev-dependencies - ce9012c (feat)
2. Task 2: Add unit tests to crypto.rs, compression.rs, and format.rs - 3e96b1e (test)

Files Created/Modified

• src/lib.rs - Library crate re-exporting all 6 modules as public
• src/main.rs - Updated to use encrypted_archive:: imports instead of local mod declarations
• Cargo.toml - Added dev-dependencies (tempfile, assert_cmd, hex-literal, predicates)
• src/crypto.rs - 6 unit tests: encrypt/decrypt roundtrip, empty data, size formula, HMAC, SHA-256 known values
• src/compression.rs - 6 unit tests: compress/decompress roundtrip, empty/large data, should_compress heuristic
• src/format.rs - 7 unit tests: header roundtrip, TOC entry roundtrip (ASCII/Cyrillic/empty name), bad magic/version rejection, entry size calculation

Decisions Made

• Used hex-literal v1.1 (latest) for compile-time hex byte arrays in SHA-256 assertions
• Embedded tests in modules via #[cfg(test)] rather than separate test files (keeps tests close to implementation)
• Library crate re-exports all 6 modules (archive, cli, compression, crypto, format, key) for maximum flexibility

Deviations from Plan

Auto-fixed Issues

1. [Rule 3 - Blocking] Updated hex-literal version from 0.4 to 1.1

• Found during: Task 2 (adding unit tests)
• Issue: Plan specified hex-literal 1.1 but initial Cargo.toml had 0.4; cargo resolved to 0.4.1 which is outdated
• Fix: Updated Cargo.toml to hex-literal = "1.1" (latest stable)
• Files modified: Cargo.toml
• Verification: cargo build + cargo test pass
• Committed in: 3e96b1e (Task 2 commit)

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Total deviations: 1 auto-fixed (1 blocking) Impact on plan: Minor version correction, no scope change.

Issues Encountered

None

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Library crate ready for integration tests in tests/ directory (Plan 02)
• All pipeline modules have unit test coverage proving correctness
• Dev-dependencies (tempfile, assert_cmd, predicates) ready for CLI round-trip tests

Self-Check: PASSED

• All 6 key files exist on disk
• Both task commits verified: ce9012c, 3e96b1e
• cargo test: 19 passed, 0 failed

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