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76a53320c1a504f4ac39e9813e91acfe04a57b23
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3 Commits

Author SHA1 Message Date
Kyle Isom
76a53320c1 Step 19: Encryption CLI, slot management, proto updates. 
CLI: sgard encrypt init [--fido2], add-fido2 [--label], remove-slot,
list-slots, change-passphrase. sgard add --encrypt flag with
passphrase prompt for DEK unlock.

Garden: RemoveSlot (refuses last slot), ListSlots, ChangePassphrase
(re-wraps DEK with new passphrase, fresh salt).

Proto: ManifestEntry gains encrypted + plaintext_hash fields. New
KekSlot and Encryption messages. Manifest gains encryption field.

server/convert.go: full round-trip conversion for encryption section
including KekSlot map.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-03-24 09:25:20 -07:00
Kyle Isom
5bb65795c8 Step 18: FIDO2 support with interface and mock. 
FIDO2Device interface abstracts hardware interaction (Register, Derive,
Available, MatchesCredential). Real libfido2 implementation deferred;
mock device used for full test coverage.

AddFIDO2Slot: registers FIDO2 credential, derives KEK via HMAC-secret,
wraps DEK, adds fido2/<label> slot to manifest.

UnlockDEK: tries all fido2/* slots first (checks credential_id against
connected device), falls back to passphrase. User never specifies
which method.

6 tests: add slot, reject duplicate, unlock via FIDO2, fallback to
passphrase when device unavailable, slot persistence, encrypted
round-trip unlocked via FIDO2.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-03-24 09:15:20 -07:00
Kyle Isom
3b961b5d8a Step 17: Encryption core — passphrase-only, selective per-file. 
Manifest schema: Entry gains Encrypted, PlaintextHash fields.
Manifest gains Encryption section with KekSlots map (passphrase slot
with Argon2id params, salt, and wrapped DEK as base64).

garden/encrypt.go: EncryptInit (generate DEK, wrap with passphrase KEK),
UnlockDEK (derive KEK, unwrap), encryptBlob/decryptBlob using
XChaCha20-Poly1305 with random 24-byte nonces.

Modified operations:
- Add: optional encrypt flag, stores encrypted blob + plaintext_hash
- Checkpoint: detects changes via plaintext_hash, re-encrypts
- Restore: decrypts encrypted blobs before writing
- Diff: decrypts stored blob before comparing
- Status: compares against plaintext_hash for encrypted entries

10 tests covering init, persistence, unlock, add-encrypted, restore
round-trip, checkpoint, status, diff, requires-DEK guard.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-03-24 08:50:53 -07:00