keyhunter/.planning/phases/01-foundation/01-03-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
01-foundation	03	database	sqlite aes-256-gcm argon2id encryption storage modernc-sqlite	phase provides 01-foundation-01 go.mod with modernc.org/sqlite and golang.org/x/crypto dependencies	AES-256-GCM column encryption (Encrypt/Decrypt) with random nonce prepended Argon2id key derivation (DeriveKey/NewSalt) using RFC 9106 parameters SQLite database Open() with WAL mode and embedded schema migration Finding CRUD SaveFinding encrypts key_value at boundary, ListFindings decrypts transparently MaskKey helper first8...last4 display format schema.sql with findings, scans, settings tables and performance indexes	01-04-scanner 01-05-cli 17-dashboard 18-telegram	added patterns modernc.org/sqlite v1.48.1 (pure Go SQLite, CGO-free) golang.org/x/crypto (argon2.IDKey for key derivation) crypto/aes + crypto/cipher (stdlib AES-256-GCM) Encrypt-at-boundary: SaveFinding encrypts, ListFindings decrypts — storage layer handles all crypto transparently go:embed schema.sql — schema migrated on Open(), idempotent via CREATE TABLE IF NOT EXISTS WAL mode enabled on every Open() for concurrent read performance NULL scan_id: zero-value ScanID stored as SQL NULL to satisfy FK constraint	created modified pkg/storage/encrypt.go pkg/storage/crypto.go pkg/storage/db.go pkg/storage/findings.go pkg/storage/schema.sql pkg/storage/db_test.go	Argon2id over PBKDF2: RFC 9106 recommended, memory-hard, resolves blocker from STATE.md NULL scan_id for findings without parent scan — FK constraint satisfied without mandatory scan creation Nonce prepended to ciphertext in single []byte — simplifies storage (no separate column needed) MaskKey returns first8...last4 — consistent with plan spec, 12-char minimum before masking	Pattern: Encrypt-at-boundary — pkg/storage is the only layer that sees encrypted bytes Pattern: sql.NullInt64 for nullable FK columns in scan results Pattern: go:embed for all embedded assets — schema.sql embedded in db.go	STOR-01 STOR-02 STOR-03	3min	2026-04-04

Phase 1 Plan 3: Storage Layer Summary

AES-256-GCM column encryption with Argon2id key derivation and SQLite CRUD — raw BLOB verified to contain no plaintext key data

Performance

• Duration: 3 min
• Started: 2026-04-04T21:02:00Z
• Completed: 2026-04-04T21:06:06Z
• Tasks: 2
• Files modified: 7 (5 created, go.mod + go.sum updated)

Accomplishments

• AES-256-GCM Encrypt/Decrypt with prepended random nonce — non-deterministic, wrong-key fails with GCM auth error
• Argon2id DeriveKey using RFC 9106 Section 7.3 params (time=1, memory=64MB, threads=4, keyLen=32) — resolves the Argon2 vs PBKDF2 blocker from STATE.md
• SQLite opens with WAL mode, foreign keys, and embedded schema.sql migration — works with :memory: for tests
• SaveFinding/ListFindings transparently encrypt/decrypt key_value at storage boundary
• All 7 tests pass including raw-BLOB assertion confirming plaintext is not stored

Task Commits

Each task was committed atomically:

1. TDD RED: Failing test suite - 2ef54f7 (test)
2. Task 1: AES-256-GCM + Argon2id - 239e2c2 (feat)
3. Task 2: SQLite DB + schema + CRUD - 3334633 (feat)

Files Created/Modified

• pkg/storage/encrypt.go - Encrypt(plaintext, key) and Decrypt(ciphertext, key) using AES-256-GCM
• pkg/storage/crypto.go - DeriveKey(passphrase, salt) using Argon2id RFC 9106, NewSalt() 16-byte random
• pkg/storage/db.go - DB struct with Open(), Close(), SQL() — WAL mode, FK, embedded schema migration
• pkg/storage/findings.go - Finding struct, SaveFinding, ListFindings, MaskKey helper
• pkg/storage/schema.sql - CREATE TABLE for findings, scans, settings + 3 indexes
• pkg/storage/db_test.go - 7 tests including raw-BLOB encryption verification

Decisions Made

• Argon2id selected over PBKDF2 (resolves STATE.md blocker) — memory-hard, RFC 9106 recommended
• NULL scan_id: zero-value ScanID stored as SQL NULL so findings can exist without a parent scan
• Single []byte for nonce+ciphertext — no separate nonce column needed, simplifies schema

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] FK constraint failed when ScanID = 0

• Found during: Task 2 (TestSaveFindingEncrypted)
• Issue: Go zero value ScanID: 0 sent as integer 0 to SQLite, failing FK constraint (no scan with id=0)
• Fix: SaveFinding converts zero ScanID to sql.NullInt64{} (NULL), ListFindings uses sql.NullInt64 for scan
• Files modified: pkg/storage/findings.go
• Verification: TestSaveFindingEncrypted passes after fix
• Committed in: 3334633 (Task 2 commit)

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Total deviations: 1 auto-fixed (Rule 1 - Bug) Impact on plan: Necessary correctness fix — plan spec allows NULL scan_id (no NOT NULL in schema). No scope creep.

Issues Encountered

None beyond the FK constraint bug documented above.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Storage layer fully functional with transparent encryption
• pkg/storage exports: Encrypt, Decrypt, DeriveKey, NewSalt, Open, DB, Finding, SaveFinding, ListFindings, MaskKey
• Scanner (Plan 04) can call SaveFinding to persist findings
• CLI (Plan 05) can call ListFindings to display findings

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Phase: 01-foundation Completed: 2026-04-04