android-encrypted-archiver/.planning/phases/12-user-key-input/12-VERIFICATION.md

phase, verified, status, score

phase	verified	status	score
12-user-key-input	2026-02-27T00:15:00Z	passed	14/14 must-haves verified

Phase 12: User Key Input Verification Report

Phase Goal: Replace hardcoded encryption key with user-specified key input: --password (interactive prompt or CLI value, derived via Argon2id), --key (raw 64-char hex), --key-file (read 32 bytes from file). All three methods produce a 32-byte AES-256 key passed through pack/unpack/inspect. Verified: 2026-02-27T00:15:00Z Status: passed Re-verification: No -- initial verification

Goal Achievement

Observable Truths

Plan 01 Truths

#	Truth	Status	Evidence
1	User must provide exactly one of --key, --key-file, or --password to pack/unpack	VERIFIED	src/cli.rs:5 #[group(required = false, multiple = false)] enforces mutual exclusivity; src/main.rs:27 and :36 return error "required for pack/unpack" if None; test test_rejects_missing_key passes
2	Running pack --key <64-char-hex> produces a valid archive using the hex-decoded 32-byte key	VERIFIED	src/key.rs:53-65 decode_hex_key(); src/main.rs:28-29 resolve_key_for_pack -> archive::pack; all cmd_with_key() tests pass (test_roundtrip_single_text_file, etc.)
3	Running pack --key-file <path> reads exactly 32 bytes from file and uses them as the AES key	VERIFIED	src/key.rs:68-80 read_key_file(); test test_key_file_roundtrip passes with 32-byte key file
4	Running unpack --key <hex> with the same key used for pack extracts byte-identical files	VERIFIED	test test_roundtrip_single_text_file, test_roundtrip_multiple_files, and 6 other roundtrip tests all pass
5	Inspect works without a key argument (reads only metadata, not encrypted content)	VERIFIED	src/main.rs:58 passes None when no key_source; src/archive.rs:513-515 prints "TOC is encrypted, provide a key to see entry listing"; test test_inspect_without_key passes
6	Invalid hex (wrong length, non-hex chars) produces a clear error message	VERIFIED	src/key.rs:54-61 validates hex decode and 32-byte length; test test_rejects_bad_hex asserts stderr contains "32 bytes" or "hex"
7	Key file that doesn't exist or has wrong size produces a clear error message	VERIFIED	src/key.rs:69-76 validates file read and 32-byte length with descriptive error messages

Plan 02 Truths

#	Truth	Status	Evidence
8	Running pack --password mypass derives a 32-byte key via Argon2id and stores a 16-byte salt in the archive	VERIFIED	src/key.rs:93-103 resolve_key_for_pack generates salt via rand, calls derive_key_from_password (Argon2id); src/archive.rs:352-353 sets FLAG_KDF_SALT; src/archive.rs:456-458 writes salt; test test_password_roundtrip passes
9	Running unpack --password mypass reads the salt from the archive, re-derives the same key, and extracts files correctly	VERIFIED	src/main.rs:37-43 reads salt via read_archive_salt, then calls resolve_key_for_unpack; src/key.rs:112-119 derive_key_from_password with archive salt; test test_password_roundtrip passes with byte-identical output
10	Running pack --password (no value) prompts for password interactively via rpassword	VERIFIED	src/key.rs:38-49 prompt_password() uses rpassword::prompt_password(); src/key.rs:95-96 calls prompt_password(true) when password_opt is None; CLI uses Option<Option<String>> pattern (src/cli.rs:17)
11	Archives created with --password have flags bit 4 (0x10) set and 16-byte salt at offset 40	VERIFIED	src/archive.rs:352-353 sets FLAG_KDF_SALT; src/archive.rs:383-384 toc_offset = HEADER_SIZE + SALT_SIZE (40+16=56); test test_password_archive_has_salt_flag asserts "Flags: 0x1F" (0x0F + 0x10)
12	Archives created with --key or --key-file do NOT have salt (flags bit 4 clear, toc_offset=40)	VERIFIED	src/archive.rs:385-387 toc_offset = HEADER_SIZE when salt is None; salt parameter is None for hex/file keys; test test_key_archive_no_salt_flag asserts "Flags: 0x0F"
13	Wrong password on unpack causes HMAC verification failure	VERIFIED	Different password -> different Argon2id key -> HMAC mismatch or TOC decryption failure; test test_password_wrong_rejects passes
14	Pack with --password prompts for password confirmation (enter twice)	VERIFIED	src/key.rs:43-47 when confirm=true, prompts "Confirm password:" and checks match; src/key.rs:96 calls prompt_password(true) for pack

Score: 14/14 truths verified

Required Artifacts

Plan 01 Artifacts

Artifact	Expected	Status	Details
src/cli.rs	CLI arg group for --key, --key-file, --password	VERIFIED	KeyArgs struct with #[group(required = false, multiple = false)], key/key_file/password fields, flattened into Cli
src/key.rs	Key resolution from hex, file, and password (exports resolve_key, KeySource)	VERIFIED	KeySource enum (line 14), resolve_key (line 128), resolve_key_for_pack (line 83), resolve_key_for_unpack (line 108), decode_hex_key, read_key_file, ResolvedKey
src/archive.rs	pack/unpack/inspect accept key parameter	VERIFIED	pack: key: &[u8; 32], salt: Option<&[u8; 16]> (line 306); unpack: key: &[u8; 32] (line 600); inspect: key: Option<&[u8; 32]> (line 492)
src/main.rs	Wiring: CLI -> key resolution -> archive functions	VERIFIED	Lines 10-18 build KeySource from CLI args; lines 26-61 route to pack/unpack/inspect with key

Plan 02 Artifacts

Artifact	Expected	Status	Details
src/key.rs	Argon2id KDF and rpassword interactive prompt (contains "Argon2")	VERIFIED	Line 28: use argon2::Argon2; line 31: Argon2::default().hash_password_into(); rpassword at line 39
src/format.rs	Salt read/write between header and TOC (contains "read_salt")	VERIFIED	read_salt at line 345, write_salt at line 356, FLAG_KDF_SALT at line 16, SALT_SIZE at line 13
src/archive.rs	Salt generation in pack, salt reading in unpack/inspect	VERIFIED	salt parameter in pack (line 306), read_salt call in read_archive_metadata (line 60), read_archive_salt helper (line 86), FLAG_KDF_SALT usage (line 353)

Key Link Verification

Plan 01 Key Links

From	To	Via	Status	Details
src/main.rs	src/key.rs	resolve_key() call	WIRED	main.rs lines 28,40,42,53,55 call resolve_key_for_pack/resolve_key_for_unpack
src/main.rs	src/archive.rs	passing resolved key to pack/unpack/inspect	WIRED	main.rs lines 29,44,60 pass &resolved.key, &key, key.as_ref() to archive functions
src/cli.rs	src/main.rs	KeySource enum extracted from parsed CLI args	WIRED	main.rs lines 10-18 map cli.key_args fields to KeySource variants

Plan 02 Key Links

From	To	Via	Status	Details
src/key.rs	argon2 crate	Argon2::default().hash_password_into()	WIRED	key.rs line 31 calls hash_password_into
src/archive.rs	src/format.rs	write_salt/read_salt for password-derived archives	WIRED	archive.rs line 60 calls format::read_salt, line 457 calls format::write_salt
src/archive.rs	src/key.rs	derive_key_from_password call when salt present	WIRED	Not called directly from archive.rs (correct design -- called from main.rs via resolve_key_for_unpack which calls derive_key_from_password in key.rs:119). The link is conceptually correct: archive reads salt, main passes salt to key resolution.

Requirements Coverage

Requirement	Source Plan	Description	Status	Evidence
KEY-01	12-01	CLI --key <HEX> -- 64 hex chars decoded to 32-byte AES-256 key	SATISFIED	cli.rs key field, key.rs decode_hex_key(), test_roundtrip_single_text_file et al.
KEY-02	12-01	CLI --key-file <PATH> -- read exactly 32 bytes from file as raw key	SATISFIED	cli.rs key_file field, key.rs read_key_file(), test_key_file_roundtrip
KEY-03	12-02	CLI --password [VALUE] -- interactive prompt (rpassword) or value from CLI	SATISFIED	cli.rs password: Option<Option>, key.rs prompt_password(), test_password_roundtrip
KEY-04	12-02	Argon2id KDF -- derive 32-byte key from password + 16-byte random salt	SATISFIED	key.rs derive_key_from_password() using argon2::Argon2::default(), test_password_roundtrip
KEY-05	12-02	Salt storage -- flags bit 4 (0x10), 16-byte salt between header and TOC at pack	SATISFIED	format.rs FLAG_KDF_SALT/SALT_SIZE/write_salt, archive.rs lines 352-353/456-458, test_password_archive_has_salt_flag
KEY-06	12-02	Salt reading from archive at unpack/inspect -- auto-detect by flags bit 4	SATISFIED	format.rs read_salt(), archive.rs read_archive_salt(), main.rs lines 39-40 for unpack, 52-53 for inspect
KEY-07	12-01	One of --key/--key-file/--password required for pack/unpack; inspect accepts key optionally	SATISFIED	main.rs lines 26-27/35-36 error on None for pack/unpack; lines 49-60 allow None for inspect; test_inspect_without_key/test_rejects_missing_key

All 7 requirements are covered. No orphaned requirements found.

Anti-Patterns Found

File	Line	Pattern	Severity	Impact
src/archive.rs	366	data_offset: 0, // placeholder	Info	Legitimate two-pass algorithm: offset is recomputed at line 408-415 in the same function. Not a stub.

No blockers or warnings.

Human Verification Required

1. Interactive Password Prompt

Test: Run cargo run -- --password pack some_file -o test.aea (no value after --password) Expected: Terminal prompts "Password: " (hidden input), then "Confirm password: " (hidden input), then packs successfully Why human: Cannot test interactive terminal input via assert_cmd in automated tests; rpassword reads from /dev/tty

2. Password Mismatch Rejection

Test: Run cargo run -- --password pack some_file -o test.aea, enter "abc" for password, "def" for confirmation Expected: Error "Passwords do not match" Why human: Requires interactive terminal input

Gaps Summary

No gaps found. All 14 observable truths verified. All 7 requirements satisfied. All key links wired. All artifacts substantive and connected. All 52 tests pass (25 unit + 7 golden + 20 integration). No blocking anti-patterns detected.

The only items requiring human verification are the interactive password prompt flows (entering password via terminal), which cannot be tested via automated CLI tests. The non-interactive --password VALUE path is fully tested.

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Verified: 2026-02-27T00:15:00Z Verifier: Claude (gsd-verifier)