android-encrypted-archiver/.planning/phases/12-user-key-input/12-01-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
12-user-key-input	01	crypto	clap hex aes-256 key-management cli	phase provides 08-rust-directory-archiver pack/unpack/inspect with hardcoded key	CLI --key (hex) and --key-file (raw) key input for pack/unpack inspect works without key (header only) or with key (full TOC listing) KeySource enum and resolve_key() in key.rs All archive functions parameterized by user-provided key	12-02-PLAN kotlin-decoder	added patterns hex 0.4 key-parameterized archive API clap arg group for mutually exclusive key sources	created modified Cargo.toml src/cli.rs src/key.rs src/archive.rs src/main.rs src/crypto.rs tests/round_trip.rs tests/golden.rs	KeyArgs as top-level clap flatten (not per-subcommand) so --key goes before subcommand inspect accepts optional key: without key shows header only, with key shows full TOC LEGACY_KEY kept as #[cfg(test)] constant for golden vectors Password option uses Option<Option<String>> for future interactive prompt support	Key threading: all archive functions accept explicit key parameter instead of global state cmd_with_key() test helper for CLI integration tests	KEY-01 KEY-02 KEY-07	5min	2026-02-26

Phase 12 Plan 01: User Key Input Summary

CLI key input via --key (hex) and --key-file (raw bytes), replacing hardcoded constant, with inspect working keyless for header metadata

Performance

• Duration: 5 min
• Started: 2026-02-26T20:47:52Z
• Completed: 2026-02-26T20:53:36Z
• Tasks: 2
• Files modified: 8

Accomplishments

• Removed hardcoded KEY constant from production code; all archive functions now parameterized by key
• Added --key (64-char hex) and --key-file (32-byte raw file) as mutually exclusive CLI args
• inspect works without a key (shows header metadata + "TOC is encrypted" message) and with a key (full entry listing)
• All 47 tests pass: 25 unit + 7 golden + 15 integration (6 new tests added)

Task Commits

Each task was committed atomically:

1. Task 1: Add CLI key args and refactor key.rs + archive.rs signatures - acff31b (feat)
2. Task 2: Update tests and verify round-trip with explicit key - 551e499 (test)

Files Created/Modified

• Cargo.toml - Added hex 0.4 dependency
• src/cli.rs - Added KeyArgs struct with --key, --key-file, --password as clap arg group
• src/key.rs - Replaced hardcoded KEY with KeySource enum and resolve_key() function
• src/archive.rs - Refactored pack/unpack/inspect to accept key parameter
• src/main.rs - Wired CLI key args to key resolution and archive functions
• src/crypto.rs - Updated tests to use local TEST_KEY constant
• tests/golden.rs - Updated to use local KEY constant instead of imported
• tests/round_trip.rs - All tests updated with --key, 6 new tests added

Decisions Made

• KeyArgs placed at top-level Cli struct (not per-subcommand) so --key goes BEFORE the subcommand name
• inspect accepts optional key: without key shows only header fields, with key decrypts and shows full TOC
• LEGACY_KEY kept as #[cfg(test)] constant in key.rs for golden test vector compatibility
• Password field uses Option<Option<String>> to support both --password mypass and --password (future interactive prompt)

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Fixed wrong-key test assertion

• Found during: Task 2 (test_rejects_wrong_key)
• Issue: Wrong key causes TOC decryption failure ("invalid padding or wrong key") before HMAC check on individual files. The test expected "HMAC" or "verification" in stderr.
• Fix: Broadened assertion to also accept "Decryption failed" or "wrong key" in error message
• Files modified: tests/round_trip.rs
• Verification: Test passes with actual error behavior
• Committed in: 551e499 (Task 2 commit)

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Total deviations: 1 auto-fixed (1 bug fix in test) Impact on plan: Trivial test assertion fix. No scope creep.

Issues Encountered

None

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Key input foundation complete for Plan 02 (Argon2 password-based key derivation)
• --password CLI arg already accepted (returns "not yet implemented" error)
• KeySource::Password variant ready for Plan 02 implementation

Self-Check: PASSED

All 9 files verified present. Both task commits (acff31b, 551e499) found in git log.

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Phase: 12-user-key-input Completed: 2026-02-26