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

phase, verified, status, score, re_verification

phase	verified	status	score	re_verification
03-round-trip-verification	2026-02-24T21:43:47Z	passed	10/10 must-haves verified	false

Phase 3: Round-Trip Verification Report

Phase Goal: Proven byte-identical round-trips through the Rust unpack command, backed by golden test vectors Verified: 2026-02-24T21:43:47Z Status: passed Re-verification: No -- initial verification

Goal Achievement

Observable Truths

#	Truth	Status	Evidence
1	Unit tests pass for crypto module: encrypt/decrypt round-trip, HMAC compute/verify, SHA-256 known value	VERIFIED	cargo test output: 6 tests in crypto::tests all pass (encrypt_decrypt_roundtrip, encrypt_decrypt_empty, encrypted_size_formula, hmac_compute_verify, sha256_known_value, sha256_empty)
2	Unit tests pass for compression module: compress/decompress round-trip, empty data, should_compress heuristic	VERIFIED	cargo test output: 6 tests in compression::tests all pass (compress_decompress_roundtrip, compress_decompress_empty, compress_decompress_large, should_compress_text, should_not_compress_known_extensions, should_not_compress_excluded)
3	Unit tests pass for format module: header write/read round-trip, TOC entry write/read round-trip (ASCII + Cyrillic names)	VERIFIED	cargo test output: 7 tests in format::tests all pass (header_write_read_roundtrip, toc_entry_roundtrip_ascii, toc_entry_roundtrip_cyrillic, toc_entry_roundtrip_empty_name, header_rejects_bad_magic, header_rejects_bad_version, entry_size_calculation)
4	Project compiles as both library crate and binary crate	VERIFIED	cargo test compiles both src/lib.rs (lib target) and src/main.rs (bin target) without errors
5	Golden test vectors pass: AES-256-CBC encryption of 'Hello' with project KEY and fixed IV produces exact expected ciphertext	VERIFIED	test_golden_aes256cbc_hello passes: encrypt("Hello", KEY, IV=00..01) == 6e66ae8bc740efeefe83b5713fcb716f
6	Golden test vectors pass: HMAC-SHA256 of IV||ciphertext produces exact expected hash	VERIFIED	test_golden_hmac_sha256 passes: HMAC(IV||ct) == efa09db07cb1af629d7fe9eb36f31269d80d8f5ff6b2dc565b62bc4c5719ca13
7	Golden test vectors pass: SHA-256 of 'Hello' matches known value from FORMAT.md	VERIFIED	test_golden_sha256_hello passes: SHA-256("Hello") == 185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969
8	Round-trip pack->unpack produces byte-identical files for: single text file, multiple files, empty file, Cyrillic filename, large (11MB) binary	VERIFIED	6 integration tests all pass: test_roundtrip_single_text_file, test_roundtrip_multiple_files, test_roundtrip_empty_file, test_roundtrip_cyrillic_filename, test_roundtrip_large_file, test_roundtrip_no_compress_flag
9	cargo test --test golden passes all golden vector tests	VERIFIED	7 passed; 0 failed; 0 ignored
10	cargo test --test round_trip passes all integration tests	VERIFIED	6 passed; 0 failed; 0 ignored

Score: 10/10 truths verified

Required Artifacts

Artifact	Expected	Status	Details
src/lib.rs	Library crate re-exporting all modules	VERIFIED	6 lines, pub mod for archive, cli, compression, crypto, format, key
Cargo.toml	Dev-dependencies for test infrastructure	VERIFIED	Contains tempfile, assert_cmd, hex-literal, predicates
tests/golden.rs	Golden test vectors with fixed IV/key	VERIFIED	97 lines, 7 tests with hex-literal assertions, uses encrypted_archive::crypto and key::KEY
tests/round_trip.rs	CLI round-trip integration tests via assert_cmd	VERIFIED	193 lines, 6 tests using tempdir + cargo_bin! + pack/unpack + assert_eq on raw bytes
src/crypto.rs	Unit tests in #[cfg(test)] module	VERIFIED	6 unit tests (lines 80-141), covers encrypt/decrypt, HMAC, SHA-256
src/compression.rs	Unit tests in #[cfg(test)] module	VERIFIED	6 unit tests (lines 53-99), covers compress/decompress, should_compress
src/format.rs	Unit tests in #[cfg(test)] module	VERIFIED	7 unit tests (lines 213-399), covers header/TOC roundtrip, Cyrillic names, error cases, size calculation

Key Link Verification

From	To	Via	Status	Details
src/main.rs	src/lib.rs	use encrypted_archive:: imports	WIRED	Lines 2-3: use encrypted_archive::archive, use encrypted_archive::cli::{Cli, Commands}
src/lib.rs	src/crypto.rs	pub mod crypto	WIRED	Line 4: pub mod crypto;
tests/golden.rs	src/crypto.rs	use encrypted_archive::crypto	WIRED	Line 6: use encrypted_archive::crypto;
tests/golden.rs	src/key.rs	use encrypted_archive::key::KEY	WIRED	Line 7: use encrypted_archive::key::KEY;
tests/round_trip.rs	encrypted_archive binary	Command::cargo_bin!("encrypted_archive")	WIRED	Line 13: Command::new(assert_cmd::cargo::cargo_bin!("encrypted_archive"))

Requirements Coverage

Requirement	Source Plan	Description	Status	Evidence
INT-02	03-02-PLAN	Unpacked files byte-identical to originals (round-trip fidelity)	SATISFIED	6 round-trip integration tests compare raw bytes with assert_eq!, covering single file, multiple files, empty file, Cyrillic filename, 11MB binary, APK no-compress. Unpack function verifies HMAC + SHA-256 before writing.
TST-01	03-02-PLAN	Round-trip tests: archive Rust -> dearchive Rust	SATISFIED	tests/round_trip.rs -- 6 tests run actual encrypted_archive pack then encrypted_archive unpack via assert_cmd, verify byte-identical output
TST-02	03-02-PLAN	Golden test vectors: known plaintext/key/IV -> expected ciphertext	SATISFIED	tests/golden.rs -- 7 tests with fixed IV/key produce exact expected ciphertext, HMAC, and SHA-256 values (cross-verified with openssl/Python)
TST-03	03-01-PLAN	Basic unit tests for each pipeline module	SATISFIED	19 unit tests in #[cfg(test)] modules: crypto.rs (6), compression.rs (6), format.rs (7). Cover encrypt/decrypt, HMAC, SHA-256, compress/decompress, header/TOC serialization, error cases.

No orphaned requirements. REQUIREMENTS.md Traceability table maps INT-02, TST-01, TST-02, TST-03 to Phase 3 -- all accounted for.

Success Criteria Cross-Check (ROADMAP.md)

#	Success Criterion	Status	Evidence
1	Running encrypted_archive unpack archive.bin -o output_dir/ extracts all files byte-identical to originals (verified by SHA-256 comparison)	VERIFIED	archive::unpack() in src/archive.rs (lines 232-328) performs HMAC verify, decrypt, decompress, SHA-256 verify, and writes files. Round-trip tests prove byte-identical extraction via assert_eq! on raw bytes.
2	Golden test vectors exist: a known plaintext + known key + known IV produces an expected ciphertext (checked in CI)	VERIFIED	tests/golden.rs contains 7 golden vector tests with hardcoded expected values. cargo test --test golden passes all 7.
3	Unit tests cover each pipeline stage independently: compression, encryption, HMAC, format serialization/deserialization	VERIFIED	19 unit tests across 3 modules: crypto (encrypt/decrypt, HMAC, SHA-256), compression (compress/decompress, should_compress), format (header/TOC write/read, error cases, size calculation)
4	Round-trip succeeds for edge cases: empty file, large APK (>10MB), file with non-ASCII name (Cyrillic)	VERIFIED	test_roundtrip_empty_file -- 0-byte file; test_roundtrip_large_file -- 11MB deterministic binary; test_roundtrip_cyrillic_filename -- file named "file.txt" in Cyrillic

Anti-Patterns Found

File	Line	Pattern	Severity	Impact
-	-	None found	-	-

No TODO/FIXME/PLACEHOLDER/HACK comments, no unimplemented!(), no todo!(), no stub implementations detected across all source and test files.

Commit Verification

Commit	Description	Exists
ce9012c	feat(03-01): create library crate, update main.rs imports, add dev-dependencies	Yes
3e96b1e	test(03-01): add 19 unit tests for crypto, compression, and format modules	Yes
329bed6	test(03-02): add golden test vectors for crypto primitives	Yes
91ee354	test(03-02): add CLI round-trip integration tests	Yes

Test Execution Results

cargo test (2026-02-24):
  Unit tests (src/lib.rs):     19 passed, 0 failed
  Golden vectors (tests/golden.rs):  7 passed, 0 failed
  Round-trip (tests/round_trip.rs):  6 passed, 0 failed
  Total: 32 passed, 0 failed, 0 ignored

Human Verification Required

None. All phase goals are programmatically verifiable through test execution, and all tests pass.

Gaps Summary

No gaps found. All 10 must-haves verified, all 4 requirements satisfied, all 4 ROADMAP success criteria met, all 32 tests pass, no anti-patterns detected, all key links wired.

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Verified: 2026-02-24T21:43:47Z Verifier: Claude (gsd-verifier)