vault.ts

1/**2 * vault.ts — sole owner of vault state and chrome.storage vault keys.3 *4 * Every read/write of `peach_vault_a`, `peach_vault_b`, and `peach_settings`5 * goes through this module. No other file accesses those keys directly.6 * External callers reach vault operations via `messages.ts` — never by7 * importing from here cross-boundary (popup/content must not). Invariants8 * for the two-slot schema, unlock timing, and key/disk atomicity are in9 * Projects.md §3.2–§3.6.10 */1112import { deriveKey, deriveKeyRaw, generateSalt } from "../crypto/argon2";13import { extractDomain } from "../shared/domain";14import { clampSyncTimestamp } from "../shared/sync-limits";15import { computeVaultId } from "../shared/sync-identity";16import { recordSyncAlerts, type SyncAlert } from "./sync-alerts";17import {18  rootKeyToWords,19  wordsToRootKeyMaterial,20  deriveRecoveryKey,21} from "../shared/recovery-words";22import type {23  AccentColorName,24  Canary,25  LegacyVaultEntry,26  ManualSummonRecord,27  PasskeyData,28  SavedIdentity,29  StoredVault,30  VaultEntry,31  VaultHistory,32  VaultSnapshot,33} from "../shared/types";34import { decrypt, encrypt, zeroKey } from "./aes";35import { clearAutoLock, touchAutoLock } from "./alarms";36import { setRecoveryConfirmPending } from "./recovery-pending";3738type EntryDraft = Omit<39  VaultEntry,40  "id" | "createdAt" | "modifiedAt" | "deletedAt"41>;4243// Slot-neutral storage keys (v1.4.24+). Both slots always exist; slot B44// either holds the decoy vault (when duress is configured) or random noise45// that looks identical at rest. No external indicator is stored — duress46// configuration is recorded only inside the encrypted payload of slot A.47const SLOT_A = "peach_vault_a";48const SLOT_B = "peach_vault_b";4950// Legacy keys, migrated away on first access.51const LEGACY_MAIN = "peach_vault";52const LEGACY_DECOY = "peach_decoy_vault";53const LEGACY_DURESS_FLAG = "peach_duress";5455// Plaintext is padded to the next multiple of this size before encryption.56// This coarsens ciphertext-length leakage into 1 KiB buckets.57const PAD_BLOCK = 1024;5859// How many past passwords to retain per entry. Generous enough to be useful as60// a recovery aid while bounding the secret material we hold (and the ciphertext61// growth) for an entry whose password is rotated frequently.62const PASSWORD_HISTORY_MAX = 50;6364// When duress is configured, BOTH slots are padded to this fixed ceiling so65// their ciphertext lengths are identical and cannot reveal that a hidden decoy66// vault exists (audit MEDIUM — plausible-deniability leak). 256 KiB comfortably67// holds a very large vault (thousands of entries incl. passkeys). The decoy68// slot can't be re-encrypted on every real-vault save (the real session has no69// decoy key), so a fixed ceiling — rather than size-matching on each write — is70// what keeps the two slots equal. A real vault whose plaintext exceeds this71// would grow past the ceiling and re-expose the bit; that is an extreme,72// documented edge well beyond normal use.73const DURESS_SLOT_SIZE = 262_144;7475let derivedKey: Uint8Array | null = null;76// 32-byte random root key, separate from the derivedKey used for vault encryption.77// The root key is wrapped (encrypted) under the recovery key derived from the78// 12-word phrase. When the user changes their password, only the wrapping changes;79// the root key and recovery words remain stable.80let rootKey: Uint8Array | null = null;81let entries: VaultEntry[] = [];82let domainIndex: Map<string, VaultEntry[]> = new Map();83let vaultMode: "real" | "decoy" = "real";84// Cached post-unlock view of whether the real vault records that duress is85// configured. Only meaningful after a real-mode unlock; for decoy-mode unlock86// this stays false because we never see slot A's plaintext.87let duressConfigured = false;8889let migrationRan = false;9091// Set to a corruption reason during the last unlock() attempt when both slots92// decrypted but failed schema validation. Consumed and cleared by93// consumeLastUnlockFailureReason() so messages.ts can surface vault_corrupted94// distinctly from wrong-password (M7/COR-007).95//96// NOTE: module-level state — if vault.ts is ever moved to a worker context,97// this must be replaced with a structured return value from unlock() or a98// postMessage channel. The signal is invisible across module-instance99// boundaries.100let lastUnlockFailureReason: string | null = null;101102export function consumeLastUnlockFailureReason(): string | null {103  const r = lastUnlockFailureReason;104  lastUnlockFailureReason = null;105  return r;106}107108// ---------------------------------------------------------------------------109// Settings (persisted inside the encrypted vault store as a sidecar key)110// ---------------------------------------------------------------------------111112export type TextSize = "small" | "medium" | "large";113114export interface VaultSettings {115  accentColor?: AccentColorName;116  theme?: "dark" | "light";117  autoLockMinutes?: number;118  clipboardClearSeconds?: number;119  lockOnClose?: boolean;120  breachMonitoring?: boolean;121  passkeyProviderEnabled?: boolean;122  trashRetentionDays?: number;123  manualSummonDomains?: Record<string, ManualSummonRecord>;124  declinedCardFingerprints?: string[];125  /**126   * Text size scale for body copy and entry titles. Stops at "large" by127   * design — XL clips dense screens (Vault, Health) inside the fixed128   * 330×480 popup surface.129   */130  textSize?: TextSize;131  /**132   * When true, all entrance/exit transitions and ambient animations are133   * collapsed to instant. Honoured alongside the user's OS-level134   * `prefers-reduced-motion`.135   */136  reduceMotion?: boolean;137  /**138   * Android-only: when true, the master key is escrowed in AndroidKeyStore139   * and the lock screen offers biometric unlock. Toggled from Settings →140   * Security → Biometrics. Has no effect on desktop builds.141   */142  biometricsEnabled?: boolean;143  /**144   * User overrides for keyboard shortcuts. Keys are ShortcutAction names145   * (see src/shared/shortcuts.ts). Missing actions fall through to146   * DEFAULT_BINDINGS — `getActiveBindings(settings.shortcuts)` is the147   * canonical lookup. Storing only the deltas keeps the vault payload148   * small and lets default updates land for users who never rebind.149   */150  shortcuts?: Record<string, { key: string; ctrl?: boolean; meta?: boolean; shift?: boolean; alt?: boolean }>;151}152153let settings: VaultSettings = {};154155export function getSettings(): VaultSettings {156  return settings;157}158159export async function ensureSettingsLoaded(): Promise<VaultSettings> {160  await loadSettings();161  return settings;162}163164export async function updateSettings(patch: Partial<VaultSettings>): Promise<void> {165  await loadSettings();166  // LV-7: cheap insurance against prototype pollution if a future caller ever167  // feeds parsed external JSON here (native spread keeps __proto__ an own-168  // property today, but Object.assign-style consumers and JSON revivers have169  // been burned before).170  const safe = Object.fromEntries(171    Object.entries(patch).filter(172      ([k]) => !["__proto__", "constructor", "prototype"].includes(k),173    ),174  ) as Partial<VaultSettings>;175  settings = { ...settings, ...safe };176  await persistSettings();177}178179async function persistSettings(): Promise<void> {180  try {181    await chrome.storage.local.set({ peach_settings: settings });182  } catch (err) {183    throw mapStorageError(err);184  }185}186187function mapStorageError(err: unknown): Error {188  const message = err instanceof Error ? err.message : String(err);189  if (/QUOTA_BYTES|quota/i.test(message)) {190    return new Error("STORAGE_QUOTA_EXCEEDED");191  }192  return err instanceof Error ? err : new Error(message);193}194195async function loadSettings(): Promise<void> {196  const result = await chrome.storage.local.get("peach_settings");197  settings = (result as { peach_settings?: VaultSettings }).peach_settings ?? {};198}199200// Fire-and-forget sync trigger after a committed vault write. Lazy201// dynamic import avoids a circular dependency between vault.ts and202// sync-trigger.ts (the trigger imports paired-devices, which only reads203// storage, but the lazy load also gives us a clean opt-out path in204// tests where sync-trigger has not been initialised).205function fireSyncTrigger(reason: "vault_change"): void {206  void import("./sync-trigger")207    .then((mod) => mod.triggerSyncIfReachable({ reason }))208    .catch(() => {209      /* sync trigger module not available — non-fatal */210    });211}212213// ---------------------------------------------------------------------------214// HIBP breach check (k-anonymity model)215// ---------------------------------------------------------------------------216217export async function checkBreach(password: string): Promise<number> {218  // HIBP k-anonymity API is keyed on SHA-1 prefixes — this is dictated by219  // the public API, not a security choice. Do not migrate to SHA-256 here.220  const encoder = new TextEncoder();221  const hashBuffer = await crypto.subtle.digest("SHA-1", encoder.encode(password));222  const hashHex = Array.from(new Uint8Array(hashBuffer))223    .map((b) => b.toString(16).padStart(2, "0"))224    .join("")225    .toUpperCase();226227  const prefix = hashHex.slice(0, 5);228  const suffix = hashHex.slice(5);229230  try {231    // PCH-02-007: request HIBP response padding so response length does not232    // reveal how many suffixes a queried prefix returned.233    const res = await fetch(`https://api.pwnedpasswords.com/range/${prefix}`, {234      headers: { "Add-Padding": "true" },235    });236    if (!res.ok) return 0;237    const text = await res.text();238    const match = text.split("\r\n").find((l) => l.startsWith(suffix));239    return match ? parseInt(match.split(":")[1], 10) : 0;240  } catch {241    return 0; // Network unavailable — don't block242  }243}244245export async function declineCardSaveOffer(last4: string, expMonth: string, expYear: string): Promise<void> {246  const fingerprint = await cardFingerprint(last4, expMonth, expYear);247  await loadSettings();248  settings = {249    ...settings,250    declinedCardFingerprints: [...(settings.declinedCardFingerprints ?? []), fingerprint],251  };252  await persistSettings();253}254255export async function isCardDeclined(last4: string, expMonth: string, expYear: string): Promise<boolean> {256  await loadSettings();257  const fingerprint = await cardFingerprint(last4, expMonth, expYear);258  return (settings.declinedCardFingerprints ?? []).includes(fingerprint);259}260261async function cardFingerprint(last4: string, expMonth: string, expYear: string): Promise<string> {262  const encoder = new TextEncoder();263  const buf = await crypto.subtle.digest("SHA-256", encoder.encode(`${last4}|${expMonth}|${expYear}`));264  return Array.from(new Uint8Array(buf).slice(0, 8))265    .map((b) => b.toString(16).padStart(2, "0"))266    .join("");267}268269function hex(buf: Uint8Array): string {270  return Array.from(buf)271    .map((b) => b.toString(16).padStart(2, "0"))272    .join("");273}274275function unhex(s: string): Uint8Array {276  const out = new Uint8Array(s.length / 2);277  for (let i = 0; i < s.length; i += 2) {278    out[i / 2] = parseInt(s.slice(i, i + 2), 16);279  }280  return out;281}282283// ---------------------------------------------------------------------------284// Root key generation and recovery word wrapping285// ---------------------------------------------------------------------------286287/**288 * Generate a random 32-byte root key and wrap it (AES-256-GCM) under a key289 * derived from the recovery word material via HKDF-SHA256. The wrapped blob290 * fields are stored in slot A alongside the password-wrapped ciphertext. The291 * root key itself is kept in memory for the session so getRecoveryWords() can292 * encode it without re-deriving.293 *294 * SECURITY MODEL (PCH-01-005): the recovery KEK is derived from the 12-word295 * material, which encodes only rootKey[0..16] (recovery-words.ts). The KEK is thus296 * derived from a PREFIX of the very plaintext it wraps, and effective recovery297 * security is 128-bit (standard for a 12-word phrase), NOT 256-bit. This is safe —298 * unwrapping requires the words, and the GCM ciphertext leaks nothing without them —299 * but it is intentional, not an oversight. A future escrow version wanting 256-bit300 * recovery must derive the words from INDEPENDENT entropy, not from the root key.301 */302async function generateAndWrapRootKey(): Promise<{303  rawRootKey: string; // hex of the plaintext root key — caller stores in rootKey304  recoverySalt: string;305  wrappedRootKey: string;306  wrappedNonce: string;307  wrappedTag: string;308}> {309  const rootKeyBytes = crypto.getRandomValues(new Uint8Array(32));310311  // Derive the recovery key from the BIP39 words encoding of the root key.312  const words = await rootKeyToWords(rootKeyBytes);313  const wordMaterial = await wordsToRootKeyMaterial(words);314  const recoverySalt = crypto.getRandomValues(new Uint8Array(16));315  const recoveryKey = await deriveRecoveryKey(wordMaterial, recoverySalt);316317  // Wrap the root key with the recovery key using AES-256-GCM directly.318  // We hex-encode rootKeyBytes so the plaintext is always valid UTF-8.319  const nonce = crypto.getRandomValues(new Uint8Array(12));320  const encoded = new TextEncoder().encode(hex(rootKeyBytes));321  const raw = await crypto.subtle.encrypt(322    {323      name: "AES-GCM",324      iv: nonce,325      additionalData: new Uint8Array([1]).buffer as ArrayBuffer,326      tagLength: 128,327    },328    recoveryKey,329    encoded330  );331  // WebCrypto returns ciphertext || auth tag concatenated; split them.332  const rawU8 = new Uint8Array(raw);333  const ciphertext = hex(rawU8.slice(0, rawU8.length - 16));334  const tag = hex(rawU8.slice(rawU8.length - 16));335336  return {337    rawRootKey: hex(rootKeyBytes),338    recoverySalt: hex(recoverySalt),339    wrappedRootKey: ciphertext,340    wrappedNonce: hex(nonce),341    wrappedTag: tag,342  };343}344345async function wrapExistingRootKeyForRecovery(rootKeyBytes: Uint8Array): Promise<{346  recoverySalt: string;347  wrappedRootKey: string;348  wrappedNonce: string;349  wrappedTag: string;350}> {351  if (rootKeyBytes.length !== 32) {352    throw new Error("ADOPT_INVALID_ROOT_KEY: expected 32 bytes");353  }354355  const words = await rootKeyToWords(rootKeyBytes);356  const wordMaterial = await wordsToRootKeyMaterial(words);357  const recoverySalt = crypto.getRandomValues(new Uint8Array(16));358  const recoveryKey = await deriveRecoveryKey(wordMaterial, recoverySalt);359  const nonce = crypto.getRandomValues(new Uint8Array(12));360  const encoded = new TextEncoder().encode(hex(rootKeyBytes));361  const raw = await crypto.subtle.encrypt(362    {363      name: "AES-GCM",364      iv: nonce,365      additionalData: new Uint8Array([1]).buffer as ArrayBuffer,366      tagLength: 128,367    },368    recoveryKey,369    encoded,370  );371  const rawU8 = new Uint8Array(raw);372  return {373    recoverySalt: hex(recoverySalt),374    wrappedRootKey: hex(rawU8.slice(0, rawU8.length - 16)),375    wrappedNonce: hex(nonce),376    wrappedTag: hex(rawU8.slice(rawU8.length - 16)),377  };378}379380/**381 * Unwrap the root key using recovery words. Called during recovery flow when382 * the user provides their 12-word phrase and a new password.383 * Exported for use by the RECOVER_WITH_WORDS message handler.384 */385export async function unwrapRootKeyForRecovery(386  wrappedRootKey: string,387  wrappedNonce: string,388  wrappedTag: string,389  recoverySaltHex: string,390  words: string[]391): Promise<void> {392  const wordMaterial = await wordsToRootKeyMaterial(words);393  const recoverySalt = unhex(recoverySaltHex);394  const recoveryKey = await deriveRecoveryKey(wordMaterial, recoverySalt);395396  // Decrypt and cache the root key. The root key bytes were hex-encoded before397  // encryption so the ciphertext is valid UTF-8. We inline the AES-GCM decrypt398  // here to avoid passing a CryptoKey to the string-based encrypt/decrypt helpers.399  // Each component is stored separately in the vault slot; decode them individually400  // so the nonce is always exactly the 12 bytes from wrappedNonce.401  const nonceRaw = unhex(wrappedNonce);402  const ciphertextRaw = unhex(wrappedRootKey);403  const tagRaw = unhex(wrappedTag);404  // Combine ciphertext and tag for AES-GCM (expects ciphertext||tag).405  // Use explicit ArrayBuffer allocations to satisfy TS BufferSource constraints.406  const nonceU8 = nonceRaw as unknown as Uint8Array<ArrayBuffer>;407  const combined = new Uint8Array(ciphertextRaw.length + tagRaw.length);408  combined.set(ciphertextRaw, 0);409  combined.set(tagRaw, ciphertextRaw.length);410  const raw = await crypto.subtle.decrypt(411    { name: "AES-GCM", iv: nonceU8, additionalData: new Uint8Array([1]).buffer as ArrayBuffer, tagLength: 128 },412    recoveryKey,413    combined414  );415  const decryptedHex = new TextDecoder().decode(raw);416  rootKey = unhex(decryptedHex);417}418419/**420 * Re-wrap the cached root key under a new derived key (from the user's new421 * password). Called after password change and after recovery re-key so the422 * same recovery words continue to work with the updated password — and so423 * subsequent unlocks can rehydrate rootKey via deriveRootKeyFromDerivedKey.424 *425 * recovery_* fields are intentionally not touched: those wrap rootKey under426 * the recovery words, which do not change when the password changes.427 */428export async function rewrapRootKeyForPassword(429  newDerivedKey: Uint8Array,430  _newSalt: Uint8Array431): Promise<void> {432  if (!rootKey) throw new Error("root key not set");433  const slotA = await loadSlot(SLOT_A);434  if (!slotA) throw new Error("missing slot A");435  const pwRoot = await wrapRootKeyForDerivedKey(newDerivedKey, rootKey);436  await writeSlot(SLOT_A, { ...slotA, ...pwRoot });437}438439/**440 * Change the vault encryption to a new derived key (already derived from441 * the user's new password). Used by RECOVER_WITH_WORDS and changePassword.442 * Caller is responsible for key swap and snapshot.443 */444async function reencryptVaultForNewKey(445  newKey: Uint8Array,446  slotA: StoredVault447): Promise<void> {448  const plaintext = encodePayload(entries, duressConfigured, duressConfigured ? DURESS_SLOT_SIZE : 0);449  const { nonce, ciphertext, tag } = await encrypt(newKey, plaintext, "slot_a_v1");450  await writeSlot(SLOT_A, {451    ...slotA,452    nonce,453    ciphertext,454    tag,455  });456}457458/**459 * Full password change with an already-derived key (used after recovery).460 * Unlike changePassword(), this skips re-verification of current password461 * since recovery flow has already validated the user's identity via words.462 */463export async function changePasswordWithNewKey(464  newSalt: Uint8Array,465  newKey: Uint8Array466): Promise<void> {467  const slotA = await loadSlot(SLOT_A);468  if (!slotA) throw new Error("missing slot A");469  // reencryptVaultForNewKey must receive the updated salt so that subsequent470  // UNLOCK calls with the new password can re-derive the correct key.471  await reencryptVaultForNewKey(newKey, { ...slotA, salt: hex(newSalt) });472  if (derivedKey) zeroKey(derivedKey);473  derivedKey = newKey;474  // PCH-01-008: re-escrow the new key (see changePassword). The recovery flow475  // reaches this path, so a post-recovery SW restart would otherwise lock out476  // a user who just reset their password.477  void saveSessionKey(newKey, "real");478  // Refresh pw_root_* under the new key so deriveRootKeyFromDerivedKey works479  // on the next unlock (H2/COR-006). If rootKey is missing — recovery flow480  // should have populated it — fall back silently rather than blowing up the481  // recovery path; migrateToRecovery will rehydrate on the next unlock.482  if (rootKey) {483    const slotAfter = await loadSlot(SLOT_A);484    if (slotAfter) {485      const pwRoot = await wrapRootKeyForDerivedKey(newKey, rootKey);486      await writeSlot(SLOT_A, { ...slotAfter, ...pwRoot });487    }488  }489  if (!duressConfigured) {490    await writeSlot(SLOT_B, generateNoiseBlob(slotA.ciphertext.length / 2));491  }492  await stampLocalVaultMutation();493}494495// ---------------------------------------------------------------------------496// Salt generation --- exported so the RECOVER_WITH_WORDS handler can derive497// a new key after password reset without re-importing the crypto module.498// ---------------------------------------------------------------------------499500export { deriveKey, generateSalt };501502export async function loadSlotA(): Promise<StoredVault | null> {503  return loadSlot(SLOT_A);504}505506/**507 * Recover the session root key by AES-GCM-decrypting the pw_root_* fields508 * (a second wrapping of the root key under the password-derived key). This509 * is what makes GET_RECOVERY_WORDS work across lock/unlock cycles without510 * the user re-entering their recovery phrase: the same root key bytes —511 * and therefore the same 12 words — survive every unlock.512 *513 * Returns null when the pw_root fields are absent (pre-v2.12 vault that514 * hasn't been migrated yet) or when decryption fails (wrong derived key,515 * tampered ciphertext). On null the caller should fall through to516 * migrateToRecovery() to populate the fields.517 */518async function deriveRootKeyFromDerivedKey(519  derivedKeyBytes: Uint8Array,520  slotA: StoredVault,521): Promise<Uint8Array | null> {522  if (!slotA.pw_root_ciphertext || !slotA.pw_root_nonce || !slotA.pw_root_tag) {523    return null;524  }525  try {526    const rootHex = await decrypt(527      derivedKeyBytes,528      slotA.pw_root_nonce,529      slotA.pw_root_ciphertext,530      slotA.pw_root_tag,531      "pw_root_v1",532    );533    return unhex(rootHex);534  } catch {535    return null;536  }537}538539// AES-GCM-wrap rootKey under derivedKey for the pw_root_* fields. Returns the540// hex-encoded ciphertext/nonce/tag triple ready to embed in StoredVault.541async function wrapRootKeyForDerivedKey(542  derivedKeyBytes: Uint8Array,543  rootKeyBytes: Uint8Array,544): Promise<{ pw_root_ciphertext: string; pw_root_nonce: string; pw_root_tag: string }> {545  const { nonce, ciphertext, tag } = await encrypt(derivedKeyBytes, hex(rootKeyBytes), "pw_root_v1");546  return {547    pw_root_ciphertext: ciphertext,548    pw_root_nonce: nonce,549    pw_root_tag: tag,550  };551}552553/**554 * For vaults created before v2.12 (no recovery_salt/recovery_wrapped_root_key),555 * generate the root key, wrap it under the recovery words, and persist the556 * recovery escrow into slot A. The caller must show the recovery words to the557 * user before calling this — once called, those words are the vault's recovery558 * path. This runs once, on the first unlock of an upgraded vault.559 */560export async function migrateToRecovery(): Promise<void> {561  if (!derivedKey || vaultMode !== "real") {562    throw new Error("vault must be unlocked in real mode");563  }564  const slotA = await loadSlot(SLOT_A);565  if (!slotA) throw new Error("missing slot A");566  const hasRecoveryEscrow =567    !!slotA.recovery_salt && !!slotA.recovery_wrapped_root_key;568  const hasPwRoot = !!slotA.pw_root_ciphertext && !!slotA.pw_root_nonce;569  if (hasRecoveryEscrow && hasPwRoot) return; // already done570571  // If recovery escrow already exists but pw_root doesn't, we cannot recover572  // the original rootKey without the user's words. The least-surprising path573  // is to rotate to a fresh root key — the user's old recovery words become574  // invalid but we surface peach_recovery_pending so the popup re-presents575  // the words. The unlock-path callers all set that flag.576  const { rawRootKey, recoverySalt, wrappedRootKey, wrappedNonce, wrappedTag } =577    await generateAndWrapRootKey();578  rootKey = unhex(rawRootKey);579580  const pwRoot = await wrapRootKeyForDerivedKey(derivedKey, rootKey);581  const nextSlotA: StoredVault = {582    ...slotA,583    recovery_salt: recoverySalt,584    recovery_wrapped_root_key: wrappedRootKey,585    recovery_nonce: wrappedNonce,586    recovery_tag: wrappedTag,587    ...pwRoot,588  };589  await writeSlot(SLOT_A, nextSlotA);590  await stampLocalVaultMutation();591}592593/**594 * Returns the 12 recovery words for the current session's root key.595 * Must be called while the vault is unlocked. Throws if recovery has not596 * been set up (pre-v2.12 vault that hasn't migrated yet).597 */598export async function getRecoveryWords(): Promise<string[]> {599  if (!rootKey) {600    throw new Error("recovery not set up — vault may need migration");601  }602  return rootKeyToWords(rootKey);603}604605async function loadSlot(key: string): Promise<StoredVault | null> {606  const result = await chrome.storage.local.get(key);607  return (result as Record<string, StoredVault | undefined>)[key] ?? null;608}609610async function writeSlot(key: string, vault: StoredVault): Promise<void> {611  try {612    await chrome.storage.local.set({ [key]: vault });613  } catch (err) {614    throw mapStorageError(err);615  }616}617618async function commitCreatedVaultSlots(slotA: StoredVault, slotB: StoredVault): Promise<void> {619  const raw = await chrome.storage.local.get("peach_last_modified_at");620  const previous = Number(621    (raw as Record<string, unknown>).peach_last_modified_at,622  );623  const next = Math.max(624    Date.now(),625    Number.isFinite(previous) ? previous + 1 : 0,626  );627  try {628    await chrome.storage.local.set({629      [SLOT_A]: slotA,630      [SLOT_B]: slotB,631      peach_last_modified_at: String(next),632    });633  } catch (err) {634    throw mapStorageError(err);635  }636}637638// Monotonic clock for per-entry modifiedAt / deletedAt timestamps. Guards the639// sync layer's last-write-wins merge against wall-clock regressions (NTP step,640// manual clock change, DST glitch): a backwards Date.now() must never produce641// an entry timestamp that's <= the entry's existing modifiedAt, or a genuine642// local edit would lose to a stale remote copy. The returned value is always643// strictly greater than both the entry's current modifiedAt and the previous644// call's result (SEV-2-E).645let lastEntryTimestamp = 0;646function monotonicEntryTimestamp(currentModifiedAt?: number): number {647  const base = Math.max(648    Date.now(),649    (currentModifiedAt ?? 0) + 1,650    lastEntryTimestamp + 1,651  );652  lastEntryTimestamp = base;653  return base;654}655656async function stampLocalVaultMutation(): Promise<void> {657  const raw = await chrome.storage.local.get("peach_last_modified_at");658  const previous = Number(659    (raw as Record<string, unknown>).peach_last_modified_at,660  );661  const next = Math.max(662    Date.now(),663    Number.isFinite(previous) ? previous + 1 : 0,664  );665  await chrome.storage.local.set({666    peach_last_modified_at: String(next),667  });668}669670/**671 * One-shot migration from the pre-A-2 schema (peach_vault + peach_decoy_vault672 * + peach_duress flag) to the slot-neutral schema (peach_vault_a +673 * peach_vault_b). Runs at most once per session; safe to call repeatedly.674 */675async function ensureMigrated(): Promise<void> {676  if (migrationRan) return;677  migrationRan = true;678679  const keys = [LEGACY_MAIN, LEGACY_DECOY, LEGACY_DURESS_FLAG, SLOT_A, SLOT_B];680  const raw = await chrome.storage.local.get(keys);681  const slotAExists = raw[SLOT_A] !== undefined;682  const slotBExists = raw[SLOT_B] !== undefined;683  const legacyMain = raw[LEGACY_MAIN] as StoredVault | undefined;684  const legacyDecoy = raw[LEGACY_DECOY] as StoredVault | undefined;685686  // Fresh install with nothing in storage — nothing to do; createVault() sets up both slots.687  if (!slotAExists && !legacyMain) return;688689  // Already migrated.690  if (slotAExists && slotBExists && !legacyMain && !legacyDecoy) return;691692  let didMigrate = false;693  if (legacyMain && !slotAExists) {694    await writeSlot(SLOT_A, legacyMain);695    didMigrate = true;696  }697698  // If slot B isn't set, populate it: use legacy decoy when present, else noise.699  if (!slotBExists) {700    const target = (legacyMain ?? raw[SLOT_A]) as StoredVault | undefined;701    if (legacyDecoy) {702      await writeSlot(SLOT_B, legacyDecoy);703      didMigrate = true;704    } else if (target) {705      await writeSlot(SLOT_B, generateNoiseBlob(target.ciphertext.length / 2));706      didMigrate = true;707    }708  }709710  const toRemove: string[] = [];711  if (legacyMain) toRemove.push(LEGACY_MAIN);712  if (legacyDecoy) toRemove.push(LEGACY_DECOY);713  if (raw[LEGACY_DURESS_FLAG] !== undefined) toRemove.push(LEGACY_DURESS_FLAG);714  if (toRemove.length > 0) {715    await chrome.storage.local.remove(toRemove);716    didMigrate = true;717  }718  if (didMigrate) {719    await stampLocalVaultMutation();720  }721}722723// ---------------------------------------------------------------------------724// Padding + noise helpers725// ---------------------------------------------------------------------------726727/**728 * Pads the plaintext string with trailing spaces so that the encoded byte729 * length is a multiple of PAD_BLOCK. JSON.parse tolerates trailing730 * whitespace after a complete document, so the padding is transparent on731 * decode. Ciphertext length equals plaintext length plus a 16-byte tag.732 */733function padPlaintext(json: string, minBytes = 0): string {734  const encoded = new TextEncoder().encode(json);735  const bucket = Math.max(PAD_BLOCK, Math.ceil(encoded.length / PAD_BLOCK) * PAD_BLOCK);736  // minBytes lets the duress path force a fixed ceiling so both slots match.737  const target = Math.max(bucket, minBytes);738  const padLen = target - encoded.length;739  return json + " ".repeat(padLen);740}741742/**743 * Produces a StoredVault-shaped record filled with CSPRNG bytes. The744 * ciphertext length matches the given byte count. Because GCM ciphertext is745 * pseudo-random, this blob is indistinguishable at rest from a real746 * encrypted vault without the key.747 *748 * crypto.getRandomValues() caps each call at 65536 bytes (the Web Crypto749 * spec hard limit). Chunk the fill so vaults larger than that — common once750 * the user has dozens of entries or any passkey — don't throw.751 */752const CSPRNG_CHUNK = 65_536;753754function fillRandom(buf: Uint8Array): Uint8Array {755  for (let offset = 0; offset < buf.length; offset += CSPRNG_CHUNK) {756    const end = Math.min(offset + CSPRNG_CHUNK, buf.length);757    const chunk = new Uint8Array(end - offset);758    crypto.getRandomValues(chunk);759    buf.set(chunk, offset);760  }761  return buf;762}763764function generateNoiseBlob(ciphertextBytes: number): StoredVault {765  const salt = crypto.getRandomValues(new Uint8Array(16));766  const nonce = crypto.getRandomValues(new Uint8Array(12));767  const cipher = fillRandom(new Uint8Array(ciphertextBytes));768  const tag = crypto.getRandomValues(new Uint8Array(16));769  return {770    version: 1,771    salt: hex(salt),772    nonce: hex(nonce),773    ciphertext: hex(cipher),774    tag: hex(tag),775  };776}777778// ---------------------------------------------------------------------------779// Encrypted plaintext envelope780// ---------------------------------------------------------------------------781782type VaultPayload = {783  entries: VaultEntry[];784  duressConfigured?: boolean;785};786787type DecryptedPayload = {788  entries: VaultEntry[];789  duressConfigured: boolean;790  /**791   * True when at least one entry in the on-disk payload had a legacy shape792   * (pre-v2.11.0 passkey type/flat fields, or pre-A-2 created/updated keys)793   * and got rewritten by normalizeEntry. The unlock path uses this to794   * persist the new shape immediately — without it, the migration would795   * re-run on every unlock and old shape never disappears from disk.796   */797  migratedFromLegacy: boolean;798};799800function encodePayload(entries: VaultEntry[], duress: boolean, minBytes = 0): string {801  const envelope: VaultPayload = { entries, duressConfigured: duress };802  return padPlaintext(JSON.stringify(envelope), minBytes);803}804805function rawNeedsMigration(raw: VaultEntry | LegacyVaultEntry): boolean {806  if ("created" in raw || "updated" in raw) return true;807  const flat = raw as Partial<VaultEntry>;808  if (flat.type === "passkey") return true;809  // Flat rpId without a passkey sub-object means pre-v2.11.0 schema.810  if (flat.rpId !== undefined && flat.passkey === undefined) return true;811  return false;812}813814function decodePayload(plain: string): DecryptedPayload {815  const parsed = JSON.parse(plain) as816    | Array<VaultEntry | LegacyVaultEntry>817    | VaultPayload;818819  const rawEntries = Array.isArray(parsed) ? parsed : parsed.entries ?? [];820  const flatMigrationNeeded = rawEntries.some(rawNeedsMigration);821822  const normalized = rawEntries.map(normalizeEntry);823  const { merged } = mergePasskeyOnlyIntoLogins(normalized);824825  if (Array.isArray(parsed)) {826    return {827      entries: normalized,828      duressConfigured: false,829      migratedFromLegacy: true, // pre-A-2 array shape always needs save830    };831  }832833  return {834    entries: normalized,835    duressConfigured: parsed.duressConfigured === true,836    migratedFromLegacy: flatMigrationNeeded || merged,837  };838}839840/**841 * One-time consolidation pass run alongside the legacy passkey migration.842 *843 * Pre-v2.11.0 the Chrome passkey path always created a fresh `type:"passkey"`844 * entry per registration — so users who tested registration multiple times845 * accumulated several passkey-bearing entries for the same RP, and the846 * migration to the unified shape carried that duplication forward. This847 * pass collapses the duplicates:848 *849 *   1. Group passkey-bearing (and not deleted) entries by `passkey.rpId`.850 *   2. Within each group, the most recently-active credential wins (prefer851 *      lastUsedAt, fall back to passkey.createdAt, fall back to modifiedAt).852 *   3. If a NON-passkey login entry exists for that RP (matched by url or853 *      additionalUrls hostname), attach the winning passkey to it and854 *      soft-delete every passkey-bearing entry in the group.855 *   4. Otherwise, soft-delete every loser in the group, keeping the winner856 *      as a passkey-only entry.857 *858 * Soft delete (deletedAt) rather than splice — the trash flow keeps the859 * record around for retention and the user can restore if the heuristic860 * picked wrong. The `merged` flag goes back to decodePayload so the861 * unlock path persists the consolidated shape immediately.862 */863function mergePasskeyOnlyIntoLogins(entries: VaultEntry[]): { merged: boolean } {864  let merged = false;865  const now = Date.now();866867  const candidates = entries.filter((e) => !e.deletedAt && e.passkey);868  const byRpId = new Map<string, VaultEntry[]>();869  for (const e of candidates) {870    const rpId = e.passkey!.rpId;871    const list = byRpId.get(rpId);872    if (list) list.push(e);873    else byRpId.set(rpId, [e]);874  }875876  for (const [rpId, group] of byRpId) {877    if (group.length === 0) continue;878    group.sort((a, b) => {879      const aT =880        a.passkey!.lastUsedAt ?? a.passkey!.createdAt ?? a.modifiedAt ?? a.createdAt;881      const bT =882        b.passkey!.lastUsedAt ?? b.passkey!.createdAt ?? b.modifiedAt ?? b.createdAt;883      return bT - aT;884    });885    const winner = group[0]!;886887    // Look for a NON-passkey login entry matching this RP. Use the URL888    // hostname rather than a substring search so a "login.foo.com" entry889    // doesn't accidentally absorb a passkey for "foo.com".890    const loginTarget = entries.find((e) => {891      if (e.deletedAt || e.passkey || e.type !== "login") return false;892      if (e.url && extractDomain(e.url) === rpId) return true;893      for (const extra of e.additionalUrls ?? []) {894        if (extractDomain(extra) === rpId) return true;895      }896      return false;897    });898899    if (loginTarget) {900      loginTarget.passkey = winner.passkey;901      loginTarget.modifiedAt = now;902      for (const dup of group) {903        if (!dup.deletedAt) {904          dup.deletedAt = now;905          dup.modifiedAt = now;906        }907      }908      merged = true;909    } else if (group.length > 1) {910      for (let i = 1; i < group.length; i += 1) {911        const dup = group[i]!;912        if (!dup.deletedAt) {913          dup.deletedAt = now;914          dup.modifiedAt = now;915        }916      }917      merged = true;918    }919  }920921  return { merged };922}923924// Validates that a `StoredVault` record on disk has the field shape we expect925// before treating an AES-GCM decrypt success as a clean unlock. AES-GCM only926// authenticates the static VERSION_BYTE AAD, not the `version` field on the927// outer record — a corrupted `version: 42` slot still decrypts cleanly. This928// check surfaces that as `corrupted` (M7/COR-007) so the popup can offer a929// history-restore path instead of falsely reporting "wrong password".930function hasValidVaultSchema(v: unknown): v is StoredVault {931  if (typeof v !== "object" || v === null) return false;932  const r = v as Record<string, unknown>;933  return (934    r.version === 1 &&935    typeof r.salt === "string" &&936    typeof r.nonce === "string" &&937    typeof r.ciphertext === "string" &&938    typeof r.tag === "string"939  );940}941942export type TryDecryptResult =943  | { status: "ok"; payload: DecryptedPayload }944  | { status: "wrong_key" }945  | { status: "corrupted"; reason: string };946947// Exported solely for `unlockFromCodex` below, which needs to verify a948// supplied passphrase against a slotA blob *without* committing anything to949// storage. Keep this internal otherwise — callers crossing the messages.ts950// boundary should always go through `unlock` / `verifyMainPassword` so the951// constant-time invariants in Projects.md §3.4 are not bypassed.952export async function tryDecryptSlot(953  vault: StoredVault,954  key: Uint8Array,955  aadTag?: string,956): Promise<DecryptedPayload | null> {957  const res = await tryDecryptSlotResult(vault, key, aadTag);958  return res.status === "ok" ? res.payload : null;959}960961export async function tryDecryptSlotResult(962  vault: StoredVault,963  key: Uint8Array,964  aadTag?: string,965): Promise<TryDecryptResult> {966  if (!hasValidVaultSchema(vault)) {967    return { status: "corrupted", reason: "invalid_slot_schema" };968  }969  let plain: string;970  try {971    plain = await decrypt(key, vault.nonce, vault.ciphertext, vault.tag, aadTag);972  } catch {973    return { status: "wrong_key" };974  }975  try {976    const parsed = JSON.parse(plain) as unknown;977    if (typeof parsed !== "object" || parsed === null) {978      return { status: "corrupted", reason: "invalid_payload_shape" };979    }980    if (!Array.isArray(parsed) && !Array.isArray((parsed as VaultPayload).entries)) {981      return { status: "corrupted", reason: "invalid_payload_shape" };982    }983    return { status: "ok", payload: decodePayload(plain) };984  } catch {985    return { status: "corrupted", reason: "invalid_payload_json" };986  }987}988989// ---------------------------------------------------------------------------990// Core operations991// ---------------------------------------------------------------------------992993function buildDomainIndexSync(all: VaultEntry[]): void {994  domainIndex = new Map();995996  for (const entry of all) {997    if (entry.deletedAt) continue;998    if (entry.type === "note" || entry.type === "card") continue;9991000    // An entry can match multiple sites via `additionalUrls`. Index each1001    // hostname so `queryDomain` returns the entry regardless of which alias1002    // the user is currently visiting. Dedupe per-entry so a single entry1003    // never appears twice in one bucket.1004    const domains = new Set<string>();1005    const primary = extractDomain(entry.url ?? "");1006    if (primary) domains.add(primary);1007    for (const extra of entry.additionalUrls ?? []) {1008      const d = extractDomain(extra);1009      if (d) domains.add(d);1010    }1011    if (domains.size === 0) continue;10121013    for (const domain of domains) {1014      const bucket = domainIndex.get(domain) ?? [];1015      bucket.push(entry);1016      domainIndex.set(domain, bucket);1017    }1018  }1019}10201021export async function createVault(password: string): Promise<void> {1022  await ensureMigrated();10231024  const salt = generateSalt();1025  derivedKey = await deriveKey(password, salt);1026  entries = [];1027  vaultMode = "real";1028  duressConfigured = false;1029  buildDomainIndexSync(entries);10301031  // Generate and wrap the root key for recovery word escrow.1032  const { rawRootKey, recoverySalt, wrappedRootKey, wrappedNonce, wrappedTag } =1033    await generateAndWrapRootKey();1034  rootKey = unhex(rawRootKey);10351036  const plaintext = encodePayload(entries, duressConfigured, duressConfigured ? DURESS_SLOT_SIZE : 0);1037  const { nonce, ciphertext, tag } = await encrypt(derivedKey, plaintext, "slot_a_v1");10381039  // Second wrapping of rootKey under derivedKey so future unlocks can rehydrate1040  // it without recovery words (H2/COR-006).1041  const pwRoot = await wrapRootKeyForDerivedKey(derivedKey, rootKey);10421043  const slotA: StoredVault = {1044    version: 1,1045    salt: hex(salt),1046    nonce,1047    ciphertext,1048    tag,1049    recovery_salt: recoverySalt,1050    recovery_wrapped_root_key: wrappedRootKey,1051    recovery_nonce: wrappedNonce,1052    recovery_tag: wrappedTag,1053    ...pwRoot,1054  };1055  await writeSlot(SLOT_A, slotA);10561057  // Matching-size noise blob for slot B, so a fresh install shows two1058  // similarly-shaped records regardless of whether duress is ever set up.1059  await writeSlot(SLOT_B, generateNoiseBlob(ciphertext.length / 2));1060  await stampLocalVaultMutation();10611062  touchAutoLock();1063}10641065/**1066 * Creates a local vault from an existing vault root key received through the1067 * SAS-gated adoption protocol. The password is local to this device; it wraps1068 * the adopted root key at rest and does not need to match the source device.1069 */1070export async function createVaultFromRootKey(1071  password: string,1072  rootKeyHex: string,1073): Promise<{ vaultId: string }> {1074  if (typeof password !== "string" || password.length === 0) {1075    throw new Error("ADOPT_INVALID_PASSWORD");1076  }1077  if (typeof rootKeyHex !== "string" || !/^[0-9a-f]{64}$/.test(rootKeyHex)) {1078    throw new Error("ADOPT_INVALID_ROOT_KEY: expected 64 lowercase hex chars");1079  }10801081  const rootKeyBytes = unhex(rootKeyHex);1082  if (rootKeyBytes.length !== 32) {1083    rootKeyBytes.fill(0);1084    throw new Error("ADOPT_INVALID_ROOT_KEY: expected 32 bytes");1085  }10861087  let nextDerivedKey: Uint8Array | null = null;1088  let sessionRootKey: Uint8Array | null = null;1089  try {1090    await ensureMigrated();10911092    const nextEntries: VaultEntry[] = [];1093    const nextDuressConfigured = false;1094    const vaultId = await computeVaultId(rootKeyBytes);1095    const salt = generateSalt();1096    nextDerivedKey = await deriveKey(password, salt);1097    const recovery = await wrapExistingRootKeyForRecovery(rootKeyBytes);10981099    sessionRootKey = new Uint8Array(rootKeyBytes);1100    const plaintext = encodePayload(nextEntries, nextDuressConfigured, 0);1101    const { nonce, ciphertext, tag } = await encrypt(nextDerivedKey, plaintext, "slot_a_v1");1102    const pwRoot = await wrapRootKeyForDerivedKey(nextDerivedKey, sessionRootKey);1103    const slotA: StoredVault = {1104      version: 1,1105      salt: hex(salt),1106      nonce,1107      ciphertext,1108      tag,1109      recovery_salt: recovery.recoverySalt,1110      recovery_wrapped_root_key: recovery.wrappedRootKey,1111      recovery_nonce: recovery.wrappedNonce,1112      recovery_tag: recovery.wrappedTag,1113      ...pwRoot,1114    };1115    const slotB = generateNoiseBlob(ciphertext.length / 2);1116    await commitCreatedVaultSlots(slotA, slotB);11171118    const previousDerivedKey = derivedKey;1119    const previousRootKey = rootKey;1120    derivedKey = nextDerivedKey;1121    rootKey = sessionRootKey;1122    nextDerivedKey = null;1123    sessionRootKey = null;1124    entries = nextEntries;1125    vaultMode = "real";1126    duressConfigured = nextDuressConfigured;1127    buildDomainIndexSync(entries);1128    if (previousDerivedKey && previousDerivedKey !== derivedKey) zeroKey(previousDerivedKey);1129    if (previousRootKey && previousRootKey !== rootKey) previousRootKey.fill(0);1130    touchAutoLock();11311132    return { vaultId };1133  } finally {1134    rootKeyBytes.fill(0);1135    if (nextDerivedKey) zeroKey(nextDerivedKey);1136    if (sessionRootKey) sessionRootKey.fill(0);1137  }1138}11391140export async function hasVault(): Promise<boolean> {1141  await ensureMigrated();1142  return (await loadSlot(SLOT_A)) !== null;1143}11441145/**1146 * Returns whether the real vault has recorded that a duress passphrase is1147 * configured. Reliable only after a real-mode unlock — before unlock or in1148 * decoy mode, returns false because we cannot read slot A's plaintext.1149 */1150export async function isDuressEnabled(): Promise<boolean> {1151  return vaultMode === "real" && duressConfigured;1152}11531154export async function setupDuress(duressPassword: string): Promise<void> {1155  if (!derivedKey || vaultMode !== "real") {1156    throw new Error("vault must be unlocked in real mode");1157  }1158  await ensureMigrated();11591160  // Encrypt the decoy payload (empty entries) under the duress key. Pad to1161  // at least the current slot A ciphertext size so the two slots look the1162  // same at rest at setup time.1163  const slotA = await loadSlot(SLOT_A);1164  if (!slotA) throw new Error("missing slot A");11651166  const decoySalt = generateSalt();1167  const decoyKey = await deriveKey(duressPassword, decoySalt);1168  try {1169    // Pad the decoy to the fixed duress ceiling. Slot A is re-encrypted to the1170    // same ceiling by the persistSlotA() call below (duressConfigured is now1171    // true), so both slots are exactly DURESS_SLOT_SIZE+tag at rest and their1172    // lengths cannot reveal that duress is configured (audit MEDIUM).1173    const plaintext = encodePayload([], false, DURESS_SLOT_SIZE);1174    const { nonce, ciphertext, tag } = await encrypt(decoyKey, plaintext, "slot_b_v1");1175    await writeSlot(SLOT_B, {1176      version: 1,1177      salt: hex(decoySalt),1178      nonce,1179      ciphertext,1180      tag,1181    });1182  } finally {1183    zeroKey(decoyKey);1184  }11851186  // Re-encrypt slot A with the duressConfigured flag set to true. No external1187  // flag is written — the bit lives inside the encrypted envelope.1188  duressConfigured = true;1189  await persistSlotA();1190}11911192export async function disableDuress(): Promise<void> {1193  if (!derivedKey || vaultMode !== "real") {1194    throw new Error("vault must be unlocked in real mode");1195  }1196  await ensureMigrated();11971198  // Overwrite slot B with fresh noise that matches slot A's size. The slot1199  // remains occupied so its mere existence does not signal that duress was1200  // ever configured.1201  const slotA = await loadSlot(SLOT_A);1202  if (slotA) {1203    await writeSlot(SLOT_B, generateNoiseBlob(slotA.ciphertext.length / 2));1204  }12051206  duressConfigured = false;1207  await persistSlotA();1208}12091210// L14/COR-015: this function intentionally checks slot A (real vault) only.1211// A duress-mode user attempting changePassword is rejected earlier by the1212// vaultMode === 'decoy' check at changePassword. The real-vs-decoy1213// distinction here is by design — duress users cannot rotate the real1214// password by guessing it, and the asymmetry in error timing is acceptable1215// because duress mode is opt-in and the user knows their own decoy key.1216export async function verifyMainPassword(password: string): Promise<boolean> {1217  await ensureMigrated();1218  const slotA = await loadSlot(SLOT_A);1219  if (!slotA) return false;1220  const key = await deriveKey(password, unhex(slotA.salt));1221  try {1222    return (await tryDecryptSlot(slotA, key, "slot_a_v1")) !== null;1223  } finally {1224    zeroKey(key);1225  }1226}12271228export async function unlock(password: string): Promise<boolean> {1229  // LV-1: the normal path NFC-normalizes inside deriveKey. If that fails and1230  // the supplied password is not already in NFC form, the vault may have been1231  // sealed (pre-LV-1) with the raw, un-normalized bytes — retry with those.1232  if (await attemptUnlockWithDerive(password, deriveKey)) return true;12331234  const nfc = password.normalize("NFC");1235  if (password === nfc) return false; // ASCII/NFC password — no legacy form to try12361237  if (await attemptUnlockWithDerive(password, deriveKeyRaw)) {1238    // Heal: re-seal the real slot under the NFC-normalized key so every1239    // future unlock takes the normal path. Only the real vault is re-sealed;1240    // a non-NFC duress password keeps working through this fallback.1241    if (vaultMode === "real") {1242      try {1243        const newSalt = generateSalt();1244        const newKey = await deriveKey(password, newSalt);1245        await changePasswordWithNewKey(newSalt, newKey);1246      } catch (healErr) {1247        console.warn("[Peach] LV-1 NFC heal failed:", healErr);1248      }1249    }1250    return true;1251  }1252  return false;1253}12541255async function attemptUnlockWithDerive(1256  password: string,1257  derive: typeof deriveKey,1258): Promise<boolean> {1259  await ensureMigrated();12601261  // Load both slots in parallel. Both always exist post-migration; the1262  // parallel load and the parallel derivation below keep wall-clock time1263  // constant regardless of which slot's passphrase (real or decoy) the1264  // caller supplied, so a timing side channel cannot distinguish the1265  // duress path from the real-unlock path (DUR-002).1266  const [slotA, slotB] = await Promise.all([1267    loadSlot(SLOT_A),1268    loadSlot(SLOT_B),1269  ]);12701271  // Derive both keys in parallel, unconditionally.1272  const [keyA, keyB] = await Promise.all([1273    slotA ? derive(password, unhex(slotA.salt)) : Promise.resolve(null),1274    slotB ? derive(password, unhex(slotB.salt)) : Promise.resolve(null),1275  ]);12761277  // Attempt both decrypts in parallel. The Result variant lets us distinguish1278  // 'wrong_key' from 'corrupted' so callers can offer a history-restore path1279  // when a slot's schema is invalid even though AES-GCM authenticated (M7).1280  const [resultA, resultB] = await Promise.all([1281    keyA && slotA1282      ? tryDecryptSlotResult(slotA, keyA, "slot_a_v1")1283      : Promise.resolve({ status: "wrong_key" } as TryDecryptResult),1284    keyB && slotB1285      ? tryDecryptSlotResult(slotB, keyB, "slot_b_v1")1286      : Promise.resolve({ status: "wrong_key" } as TryDecryptResult),1287  ]);1288  const payloadA = resultA.status === "ok" ? resultA.payload : null;1289  const payloadB = resultB.status === "ok" ? resultB.payload : null;12901291  if (payloadA && keyA) {1292    derivedKey = keyA;1293    void saveSessionKey(keyA, "real");1294    vaultMode = "real";1295    entries = payloadA.entries;1296    duressConfigured = payloadA.duressConfigured;1297    buildDomainIndexSync(entries);1298    await loadSettings();1299    touchAutoLock();1300    if (keyB) zeroKey(keyB);13011302    // slotA is non-null when payloadA is truthy (keyA was derived from slotA).1303    if (slotA) {1304      const needsRecoverySetup =1305        !slotA.recovery_salt || !slotA.recovery_wrapped_root_key;1306      if (!needsRecoverySetup) {1307        rootKey = await deriveRootKeyFromDerivedKey(keyA, slotA);1308      }1309      // Pre-v2.12 vault, or a vault whose pw_root_* fields haven't been written1310      // yet: generate the recovery escrow and seed pw_root_* so subsequent1311      // unlocks can rehydrate rootKey without the user's recovery words.1312      // Best-effort — a failure here must not block unlock.1313      if (needsRecoverySetup || !rootKey) {1314        try {1315          await migrateToRecovery();1316          if (needsRecoverySetup) {1317            // String "1" matches the popup's existing peach_recovery_pending1318            // check; surfaced so the user re-confirms recovery words after a1319            // legacy-vault unlock (H2/COR-006).1320            await chrome.storage.local.set({ peach_recovery_pending: '1' });1321          }1322        } catch (migrationErr) {1323          console.warn('[Peach] recovery migration failed:', migrationErr);1324        }1325      }1326    }13271328    // If the payload had a pre-v2.11.0 shape (legacy passkey type, flat1329    // passkey fields, or pre-A-2 created/updated keys), rewrite it now so1330    // the next save uses the new format and migration doesn't re-run forever.1331    if (payloadA.migratedFromLegacy) {1332      await persistSlotA();1333    }1334    return true;1335  }13361337  if (payloadB && keyB) {1338    derivedKey = keyB;1339    void saveSessionKey(keyB, "decoy");1340    vaultMode = "decoy";1341    entries = payloadB.entries;1342    duressConfigured = false;1343    buildDomainIndexSync(entries);1344    await loadSettings();1345    touchAutoLock();1346    if (keyA) zeroKey(keyA);1347    return true;1348  }13491350  if (keyA) zeroKey(keyA);1351  if (keyB) zeroKey(keyB);1352  // Surface corruption (good AES tag, broken schema) distinctly from1353  // wrong-password so the popup can offer history-restore (M7/COR-007).1354  if (resultA.status === "corrupted") {1355    lastUnlockFailureReason = resultA.reason;1356  } else if (resultB.status === "corrupted") {1357    lastUnlockFailureReason = resultB.reason;1358  }1359  return false;1360}13611362// ---------------------------------------------------------------------------1363// MV3 service worker session key — survives SW restarts within a browser session1364// ---------------------------------------------------------------------------13651366// chrome.storage.session is cleared on browser close; survives SW restart.1367// Firefox does not implement it (persistent background script, no restart risk).1368const SESSION_KEY_STORAGE = "peach_session_dk";13691370async function saveSessionKey(key: Uint8Array, mode: "real" | "decoy"): Promise<void> {1371  if (!chrome.storage.session) return;1372  await chrome.storage.session.set({ [SESSION_KEY_STORAGE]: { keyHex: hex(key), mode } });1373}13741375async function clearSessionKey(): Promise<void> {1376  if (!chrome.storage.session) return;1377  await chrome.storage.session.remove(SESSION_KEY_STORAGE);1378}13791380/**1381 * On SW restart, re-derive all in-memory vault state from the session key1382 * stored in chrome.storage.session (set at unlock time, cleared on lock).1383 * Returns true if the vault was restored, false if no session key was found.1384 * No-ops if the vault is already unlocked.1385 */1386export async function restoreFromSession(): Promise<boolean> {1387  if (derivedKey !== null) return true;1388  if (!chrome.storage.session) return false;1389  const stored = await chrome.storage.session.get(SESSION_KEY_STORAGE);1390  const entry = stored[SESSION_KEY_STORAGE] as { keyHex: string; mode: "real" | "decoy" } | undefined;1391  if (!entry?.keyHex) return false;13921393  const key = unhex(entry.keyHex);1394  const slotKey = entry.mode === "real" ? SLOT_A : SLOT_B;1395  const aadTag = entry.mode === "real" ? "slot_a_v1" : "slot_b_v1";1396  const slot = await loadSlot(slotKey);1397  if (!slot) { await clearSessionKey(); return false; }13981399  const result = await tryDecryptSlotResult(slot, key, aadTag);1400  if (result.status !== "ok") { await clearSessionKey(); return false; }14011402  derivedKey = key;1403  vaultMode = entry.mode;1404  entries = result.payload.entries;1405  duressConfigured = entry.mode === "real" ? result.payload.duressConfigured : false;1406  buildDomainIndexSync(entries);1407  await loadSettings();1408  touchAutoLock();14091410  if (entry.mode === "real" && slot.recovery_salt && slot.recovery_wrapped_root_key) {1411    try { rootKey = await deriveRootKeyFromDerivedKey(key, slot); } catch { /* non-fatal */ }1412  }14131414  return true;1415}14161417export function lock(): void {1418  void clearSessionKey();1419  if (derivedKey) {1420    zeroKey(derivedKey);1421    derivedKey = null;1422  }1423  if (rootKey) {1424    rootKey.fill(0);1425    rootKey = null;1426  }14271428  entries = [];1429  domainIndex = new Map();1430  vaultMode = "real";1431  duressConfigured = false;1432  clearAutoLock();1433}14341435export function isUnlocked(): boolean {1436  return derivedKey !== null;1437}14381439// Opens the vault using a pre-derived AES-256 key (skipping Argon2id).1440// Used by Android biometric unlock — the key was derived on the native side.1441export async function unlockWithKey(1442  masterKeyHex: string,1443): Promise<{ ok: true; entries: VaultEntry[] } | { ok: false; error: string }> {1444  try {1445    const masterKeyBytes = unhex(masterKeyHex);1446    const stored = await loadSlot(SLOT_A);1447    if (!stored) return { ok: false, error: "invalid_key" };1448    const payload = await tryDecryptSlot(stored, masterKeyBytes, "slot_a_v1");1449    if (!payload) return { ok: false, error: "invalid_key" };14501451    derivedKey = masterKeyBytes;1452    vaultMode = "real";1453    entries = payload.entries;1454    duressConfigured = payload.duressConfigured;1455    buildDomainIndexSync(entries);1456    await loadSettings();1457    touchAutoLock();14581459    // PCH-01-009: the biometric path skips Argon2id but must still rehydrate the1460    // root key, exactly like attemptUnlockWithDerive and restoreFromSession.1461    // Without it, rootKey stays null after a biometric unlock and sync +1462    // GET_RECOVERY_WORDS report the open vault as locked. Guarded and non-fatal:1463    // a missing/legacy escrow must not fail the unlock itself.1464    if (stored.recovery_salt && stored.recovery_wrapped_root_key) {1465      try {1466        rootKey = await deriveRootKeyFromDerivedKey(masterKeyBytes, stored);1467      } catch { /* non-fatal — unlock still succeeds without rootKey */ }1468    }1469    return { ok: true, entries };1470  } catch {1471    return { ok: false, error: "invalid_key" };1472  }1473}14741475/**1476 * Restore the vault from a parsed Peach Codex payload.1477 *1478 * The supplied passphrase is verified against the Codex's slotA *before* any1479 * storage mutation — wrong passphrases return without touching disk. On1480 * success, the current vault state is snapshotted (reason: "restore") so the1481 * user can revert via Settings -> Vault History, then slotA/slotB are written1482 * and `peach_last_modified_at` is set to the Codex's recorded timestamp. A1483 * regular `unlock()` follows so the rest of the SW sees the standard1484 * post-unlock state.1485 *1486 * Intentionally non-Pro-gated — see peach_codex_v2.md "Pro gating". A Codex1487 * printed by a Pro user must always be restorable, even on a free device.1488 *1489 * Timing is not held constant here (in contrast to `unlock`): the Codex flow1490 * is an explicit user action with a known passphrase, not a passive lock1491 * screen, so the duress-vs-real timing side channel does not apply.1492 */1493export async function unlockFromCodex(params: {1494  slotA: string; // JSON string of StoredVault for slot A1495  slotB: string | null; // JSON string of StoredVault for slot B, or null1496  timestamp: number;1497  masterPassphrase: string;1498}): Promise<1499  | { ok: true; entryCount: number }1500  | { ok: false; reason: "wrong_passphrase" | "invalid_slot_format" }1501> {1502  let parsedSlotA: StoredVault;1503  let parsedSlotB: StoredVault | null = null;1504  try {1505    const rawA = JSON.parse(params.slotA) as unknown;1506    if (!hasValidVaultSchema(rawA)) {1507      return { ok: false, reason: "invalid_slot_format" };1508    }1509    parsedSlotA = rawA;1510    if (params.slotB !== null) {1511      const rawB = JSON.parse(params.slotB) as unknown;1512      if (!hasValidVaultSchema(rawB)) {1513        return { ok: false, reason: "invalid_slot_format" };1514      }1515      parsedSlotB = rawB;1516    }1517  } catch {1518    return { ok: false, reason: "invalid_slot_format" };1519  }15201521  // Verify the passphrase against the supplied slotA WITHOUT writing anything.1522  // If this fails the on-disk vault is left completely untouched.1523  const trialKey = await deriveKey(params.masterPassphrase, unhex(parsedSlotA.salt));1524  const trialPayload = await tryDecryptSlot(parsedSlotA, trialKey, "slot_a_v1");1525  if (!trialPayload) {1526    zeroKey(trialKey);1527    return { ok: false, reason: "wrong_passphrase" };1528  }1529  // Drop the trial key; `unlock()` below derives its own copy. Holding two1530  // copies of the master key in memory at once would be a needless surface.1531  zeroKey(trialKey);15321533  // Snapshot the about-to-be-overwritten on-disk state so the user can revert1534  // a mistaken Codex restore via the Vault History UI. Non-fatal if it fails.1535  await takeVaultSnapshot("restore");15361537  await writeSlot(SLOT_A, parsedSlotA);1538  if (parsedSlotB) {1539    await writeSlot(SLOT_B, parsedSlotB);1540  } else {1541    // Slot B must always exist with ciphertext length matching slot A1542    // (Projects.md §3.2). Codex prints may omit slot B (duress wasn't1543    // configured); regenerate noise to satisfy the invariant.1544    await writeSlot(1545      SLOT_B,1546      generateNoiseBlob(parsedSlotA.ciphertext.length / 2),1547    );1548  }1549  await chrome.storage.local.set({1550    peach_last_modified_at: String(params.timestamp),1551  });15521553  // Standard unlock path so domain index, settings, auto-lock, and1554  // recovery-key state all populate exactly as a normal unlock would.1555  const ok = await unlock(params.masterPassphrase);1556  if (!ok) {1557    // Should be unreachable — we just verified the passphrase against the1558    // same slotA we wrote. Treat as wrong_passphrase to keep the contract1559    // simple if some race or storage anomaly intrudes.1560    return { ok: false, reason: "wrong_passphrase" };1561  }1562  return { ok: true, entryCount: getEntries().length };1563}15641565// Returns the current in-memory derived key as a hex string.1566// Used by the biometric enable flow in Settings to store the key in Android Keystore.1567export function getDerivedKeyHex(): string {1568  if (!derivedKey) throw new Error("vault_not_unlocked");1569  return hex(derivedKey);1570}15711572/**1573 * Returns the vault's stable root key as hex, or null when locked / not yet1574 * populated. The root key is random per-vault, generated at creation, escrowed1575 * under the recovery words, and re-wrapped (not regenerated) on every password1576 * change — so it is INVARIANT across password rotation, unlike getDerivedKeyHex.1577 *1578 * This is the correct input for sync identity derivation (vault_id, the Noise1579 * XX static key, the Ed25519 manifest signing key, and per-entry envelope1580 * keys): paired devices keep the same identity and can still decrypt each1581 * other's entries after either side rotates its master password (SEV-2-B).1582 *1583 * Returns null rather than throwing so sync callers degrade to VAULT_LOCKED1584 * instead of crashing; rootKey is populated on every real-mode unlock via1585 * deriveRootKeyFromDerivedKey / migrateToRecovery.1586 */1587export function getRootKeyHex(): string | null {1588  return rootKey ? hex(rootKey) : null;1589}15901591export function getEntries(): VaultEntry[] {1592  if (!derivedKey) throw new Error("vault_locked");1593  return entries.filter((entry) => !entry.deletedAt);1594}15951596const EMAIL_RE = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;15971598export function getIdentities(): SavedIdentity[] {1599  if (!derivedKey) throw new Error("vault_locked");1600  const active = entries.filter((e) => !e.deletedAt && e.type === "login");16011602  const emailMap = new Map<string, { lastUsed: number; count: number; domain: string }>();1603  const usernameMap = new Map<string, { lastUsed: number; count: number; domain: string }>();16041605  for (const entry of active) {1606    const domain = extractDomain(entry.url ?? "") ?? "";1607    const modifiedAt = entry.modifiedAt ?? entry.createdAt ?? 0;16081609    function tally(map: Map<string, { lastUsed: number; count: number; domain: string }>, v: string) {1610      const existing = map.get(v);1611      if (!existing || modifiedAt > existing.lastUsed) {1612        map.set(v, { lastUsed: modifiedAt, count: (existing?.count ?? 0) + 1, domain });1613      } else {1614        map.set(v, { ...existing, count: existing.count + 1 });1615      }1616    }16171618    const uVal = entry.username?.trim();1619    if (uVal) tally(EMAIL_RE.test(uVal) ? emailMap : usernameMap, uVal);16201621    // Also count the dedicated email field — entries created via the inline1622    // popup new-entry form store email here rather than in username.1623    const eVal = entry.email?.trim();1624    if (eVal) tally(emailMap, eVal);1625  }16261627  const toIdentity = (type: "email" | "username") =>1628    ([value, d]: [string, { lastUsed: number; count: number; domain: string }]): SavedIdentity => ({1629      value, type, lastUsed: d.lastUsed, useCount: d.count, exampleDomain: d.domain || undefined,1630    });16311632  return [1633    ...[...emailMap.entries()].map(toIdentity("email")).sort((a, b) => b.useCount - a.useCount),1634    ...[...usernameMap.entries()].map(toIdentity("username")).sort((a, b) => b.useCount - a.useCount),1635  ];1636}16371638export async function batchAddEntries(drafts: EntryDraft[]): Promise<VaultEntry[]> {1639  if (!derivedKey) throw new Error("vault_locked");16401641  const now = Date.now();1642  const added: VaultEntry[] = [];1643  for (const draft of drafts) {1644    try {1645      const sanitized = sanitizeEntryDraft(draft);1646      const nextEntry: VaultEntry = {1647        ...sanitized,1648        id: crypto.randomUUID(),1649        createdAt: now,1650        modifiedAt: monotonicEntryTimestamp(),1651      };1652      entries.push(nextEntry);1653      added.push(nextEntry);1654    } catch {1655      // Skip invalid drafts silently — caller can see diff between input and output length1656    }1657  }16581659  if (added.length > 0) {1660    await persistEntries();1661  }16621663  return added;1664}16651666/**1667 * Restore a set of entries in full fidelity — preserves id, createdAt,1668 * modifiedAt, and every other field unlike `batchAddEntries` which1669 * assigns fresh identity. Used by restore paths where the backup is the1670 * authoritative source of truth. `mode` controls how entries already in1671 * the vault are treated.1672 */1673export async function restoreEntries(1674  incoming: VaultEntry[],1675  mode: "replace" | "merge"1676): Promise<{ added: number; updated: number; skipped: number }> {1677  if (!derivedKey) throw new Error("vault_locked");16781679  // A replace with zero incoming entries is almost certainly a caller bug1680  // (e.g. an import that silently dropped everything). Refuse rather than1681  // wipe the vault.1682  if (mode === "replace" && incoming.length === 0) {1683    throw new Error("refuse to replace with empty entry set");1684  }16851686  let added = 0;1687  let updated = 0;1688  let skipped = 0;16891690  if (mode === "replace") {1691    entries = [];1692    for (const entry of incoming) {1693      const normalized = sanitizeRestoredEntry(entry);1694      if (!normalized) {1695        skipped += 1;1696        continue;1697      }1698      entries.push(normalized);1699      added += 1;1700    }1701  } else {1702    const byId = new Map<string, VaultEntry>();1703    for (const e of entries) byId.set(e.id, e);17041705    for (const entry of incoming) {1706      const normalized = sanitizeRestoredEntry(entry);1707      if (!normalized) {1708        skipped += 1;1709        continue;1710      }1711      const existing = byId.get(normalized.id);1712      if (!existing) {1713        entries.push(normalized);1714        added += 1;1715      } else if (normalized.modifiedAt > existing.modifiedAt) {1716        const idx = entries.findIndex((e) => e.id === existing.id);1717        if (idx !== -1) {1718          entries[idx] = normalized;1719          updated += 1;1720        }1721      } else {1722        skipped += 1;1723      }1724    }1725  }17261727  await persistEntries("import");1728  return { added, updated, skipped };1729}17301731/**1732 * Validate + normalise a VaultEntry coming from a backup, import, or sync1733 * peer. MV-6: this is a strict field WHITELIST — `normalizeEntry` copies1734 * only known VaultEntry fields (unknown/attacker keys are dropped), and1735 * nested `passkey`/`canary` shapes are rebuilt field-by-field, never1736 * spread. Returns null for values the live vault shouldn't accept.1737 */1738function sanitizeRestoredEntry(entry: VaultEntry): VaultEntry | null {1739  if (!entry || typeof entry !== "object") return null;1740  const title = typeof entry.title === "string" ? entry.title.trim() : "";1741  if (!title) return null;1742  const id = typeof entry.id === "string" && entry.id ? entry.id : crypto.randomUUID();1743  const now = Date.now();1744  const createdAt = typeof entry.createdAt === "number" ? entry.createdAt : now;1745  const modifiedAt = typeof entry.modifiedAt === "number" ? entry.modifiedAt : createdAt;17461747  // normalizeEntry whitelists every known VaultEntry field and runs the1748  // same legacy-passkey migration as the on-disk read path — pre-v2.11.01749  // backups with flat passkey fields still import correctly because the1750  // legacy flat fields are themselves whitelisted VaultEntry members.1751  const normalized = normalizeEntry({1752    ...entry,1753    id,1754    title,1755    type: entry.type ?? "login",1756    createdAt,1757    modifiedAt,1758  });17591760  if (normalized.passkey) {1761    normalized.passkey = sanitizePasskey(normalized.passkey);1762  }1763  if (normalized.canary) {1764    normalized.canary = sanitizeCanary(normalized.canary);1765  }1766  // PCH-01-016: bound tags on the restore path too, so both import funnels agree.1767  normalized.tags = sanitizeTags(normalized.tags);17681769  // Login entries from backup must carry a password (or be passkey-only,1770  // in which case the passkey sub-object replaces the password requirement).1771  if (1772    normalized.type === "login" &&1773    !normalized.passkey &&1774    typeof normalized.password !== "string"1775  ) {1776    return null;1777  }1778  if (entry.passkey && !normalized.passkey) {1779    // Entry claimed a passkey but the shape didn't validate — refuse the1780    // whole entry rather than silently importing a credential-less husk.1781    return null;1782  }17831784  return normalized;1785}17861787/**1788 * Rebuild a PasskeyData object from untrusted input, field by field.1789 * Returns undefined when required fields are missing/mistyped — a rogue1790 * passkey credential must not activate via import (MV-6 attack scenario).1791 */1792function sanitizePasskey(pk: unknown): PasskeyData | undefined {1793  if (!pk || typeof pk !== "object") return undefined;1794  const r = pk as Record<string, unknown>;1795  if (1796    typeof r.rpId !== "string" || !r.rpId ||1797    typeof r.credentialId !== "string" || !r.credentialId ||1798    typeof r.publicKeyCose !== "string" ||1799    typeof r.userHandle !== "string" ||1800    typeof r.userName !== "string"1801  ) {1802    return undefined;1803  }1804  return {1805    rpId: r.rpId,1806    rpName: typeof r.rpName === "string" ? r.rpName : r.rpId,1807    credentialId: r.credentialId,1808    publicKeyCose: r.publicKeyCose,1809    privateKeyJwk:1810      r.privateKeyJwk && typeof r.privateKeyJwk === "object"1811        ? (r.privateKeyJwk as JsonWebKey)1812        : undefined,1813    userHandle: r.userHandle,1814    userName: r.userName,1815    userDisplayName:1816      typeof r.userDisplayName === "string" ? r.userDisplayName : r.userName,1817    algorithm: r.algorithm === -8 ? -8 : -7,1818    signCount: typeof r.signCount === "number" ? r.signCount : 0,1819    aaguid: typeof r.aaguid === "string" ? r.aaguid : "",1820    backupEligible: r.backupEligible === true,1821    backupState: r.backupState === true,1822    lastUsedAt: typeof r.lastUsedAt === "number" ? r.lastUsedAt : undefined,1823    browser: r.browser === "chrome" || r.browser === "firefox" ? r.browser : undefined,1824    transports: Array.isArray(r.transports)1825      ? r.transports.filter((t): t is string => typeof t === "string")1826      : undefined,1827    createdAt: typeof r.createdAt === "number" ? r.createdAt : Date.now(),1828  };1829}18301831/**1832 * Rebuild a Canary object from untrusted input. The webhook must be a1833 * well-formed HTTPS URL — a poisoned canary.webhookUrl is a standing1834 * exfiltration endpoint that the canary subsystem will POST entry titles1835 * to (MV-6 attack scenario). Invalid → the canary is dropped, not the1836 * entry. FIRE_CANARY_PING re-validates with the full SSRF guard at fire1837 * time (isAllowedCanaryWebhookUrl), so this import-time check is the1838 * outer of two gates.1839 */1840function sanitizeCanary(c: unknown): Canary | undefined {1841  if (!c || typeof c !== "object") return undefined;1842  const r = c as Record<string, unknown>;1843  if (typeof r.webhookUrl !== "string") return undefined;1844  let url: URL;1845  try {1846    url = new URL(r.webhookUrl);1847  } catch {1848    return undefined;1849  }1850  if (url.protocol !== "https:") return undefined;1851  return {1852    webhookUrl: url.toString(),1853    label: typeof r.label === "string" ? r.label : undefined,1854    lastPinged: typeof r.lastPinged === "number" ? r.lastPinged : undefined,1855    pingCount: typeof r.pingCount === "number" ? r.pingCount : undefined,1856  };1857}18581859/**1860 * MV-6 / PCH-01-016: tags from imported / batch-added entries are untrusted.1861 * Keep only non-empty strings, cap each at 256 chars, and cap the count at 2551862 * (the same per-entry ceiling the export codec enforces, peachPayload.ts).1863 * Non-array or all-invalid input collapses to undefined.1864 */1865function sanitizeTags(tags: unknown): string[] | undefined {1866  if (!Array.isArray(tags)) return undefined;1867  const out: string[] = [];1868  for (const t of tags) {1869    if (typeof t !== "string") continue;1870    const trimmed = t.trim();1871    if (!trimmed) continue;1872    out.push(trimmed.slice(0, 256));1873    if (out.length >= 255) break;1874  }1875  return out.length > 0 ? out : undefined;1876}18771878// Soft-deletes every non-deleted entry in one call. The literal string1879// argument is a tripwire against accidental calls — any caller that would1880// wipe the vault has to consciously type "REPLACE_ALL". Do not relax this1881// to a boolean.1882export async function clearVaultEntries(1883  confirmation: "REPLACE_ALL"1884): Promise<void> {1885  if (confirmation !== "REPLACE_ALL") {1886    throw new Error("clearVaultEntries requires explicit confirmation");1887  }1888  if (!derivedKey) throw new Error("vault_locked");1889  for (const entry of entries) {1890    if (!entry.deletedAt) {1891      const stamp = monotonicEntryTimestamp(entry.modifiedAt);1892      entry.deletedAt = stamp;1893      entry.modifiedAt = stamp;1894    }1895  }1896  await persistEntries();1897}18981899export async function addEntry(entry: EntryDraft): Promise<VaultEntry> {1900  if (!derivedKey) throw new Error("vault_locked");19011902  const sanitized = sanitizeEntryDraft(entry);1903  const now = Date.now();1904  const stamp = monotonicEntryTimestamp();1905  const nextEntry: VaultEntry = {1906    ...sanitized,1907    id: crypto.randomUUID(),1908    createdAt: now,1909    modifiedAt: stamp,1910    // Stamp passwordChangedAt at creation so age tracking is accurate from1911    // day one. Non-login entries carry the same stamp harmlessly.1912    passwordChangedAt: sanitized.password ? stamp : undefined,1913  };19141915  // Clone-and-replace so a failed persist rolls back the in-memory state1916  // (COR-008). Without this, a quota-full or storage error leaves the1917  // module-level `entries` ahead of what's actually on disk.1918  const rollback = entries;1919  entries = [...entries, nextEntry];1920  try {1921    await persistEntries();1922  } catch (err) {1923    entries = rollback;1924    throw err;1925  }19261927  // Fire-and-forget breach check (only for login entries if breach monitoring is enabled or not set)1928  if (settings.breachMonitoring !== false && nextEntry.type === "login" && nextEntry.password) {1929    checkBreach(nextEntry.password).then(async (count) => {1930      if (count > 0) {1931        const idx = entries.findIndex((e) => e.id === nextEntry.id);1932        if (idx !== -1) {1933          entries[idx] = { ...entries[idx], breach: count, modifiedAt: monotonicEntryTimestamp(entries[idx].modifiedAt) };1934          await persistEntries();1935        }1936      }1937    });1938  }19391940  fireSyncTrigger("vault_change");19411942  return nextEntry;1943}19441945/**1946 * Run the passkey-merge pass on the live in-memory entries and persist if1947 * anything changed. Called immediately after any passkey registration so that1948 * a same-domain TOTP-only entry already in the vault gets consolidated right1949 * away instead of waiting until the next lock/unlock cycle.1950 */1951export async function consolidatePasskeyEntries(): Promise<void> {1952  if (!derivedKey) return;1953  const { merged } = mergePasskeyOnlyIntoLogins(entries);1954  if (merged) {1955    await persistEntries();1956  }1957}19581959export async function updateEntry(1960  id: string,1961  patch: Partial<VaultEntry>1962): Promise<void> {1963  if (!derivedKey) throw new Error("vault_locked");19641965  const idx = entries.findIndex((entry) => entry.id === id);1966  if (idx === -1 || entries[idx].deletedAt) {1967    throw new Error("entry_not_found");1968  }19691970  const current = entries[idx];1971  const sanitizedPatch = sanitizeEntryPatch(patch);1972  // Refresh passwordChangedAt only when the password value actually changes —1973  // a metadata-only update (title, tags, etc.) must not reset the age clock1974  // that drives the Pro health rotation recommendation.1975  const passwordChanged =1976    "password" in patch &&1977    typeof sanitizedPatch.password === "string" &&1978    sanitizedPatch.password !== current.password;1979  const stamp = monotonicEntryTimestamp(current.modifiedAt);1980  // When the password actually changes, push the outgoing one onto the history1981  // (newest first) so the user can reveal/copy/restore it later. We record the1982  // age it carried (passwordChangedAt, falling back to createdAt) rather than1983  // `now`, so the list reflects when each password was last in effect. Only1984  // capture a non-empty prior value — clearing a password leaves no secret to1985  // keep, and we skip an immediate exact duplicate (e.g. restore-then-restore)1986  // to avoid noise.1987  const priorPassword = current.password;1988  const shouldCapture =1989    passwordChanged &&1990    typeof priorPassword === "string" &&1991    priorPassword.length > 0 &&1992    current.passwordHistory?.[0]?.password !== priorPassword;1993  const nextHistory = shouldCapture1994    ? [1995        { password: priorPassword!, changedAt: current.passwordChangedAt ?? current.createdAt },1996        ...(current.passwordHistory ?? []),1997      ].slice(0, PASSWORD_HISTORY_MAX)1998    : current.passwordHistory;1999  entries[idx] = {2000    ...current,2001    ...sanitizedPatch,2002    modifiedAt: stamp,2003    ...(passwordChanged ? { passwordChangedAt: stamp, passwordHistory: nextHistory } : {}),2004  };2005200620072008  // Card entries must retain their card number2009  if (entries[idx].type === "card" && !entries[idx].cardNumber) {2010    entries[idx] = current;2011    throw new Error("card number is required for card entries");2012  }20132014  // Roll the in-memory entry back to its pre-edit state if the disk write2015  // fails (e.g. storage quota). Without this the module-level `entries` array2016  // would hold an edit that never landed on disk, diverging from the vault2017  // until the next unlock silently reverts it (SEV-3-A). Mirrors addEntry.2018  try {2019    await persistEntries();2020  } catch (err) {2021    entries[idx] = current;2022    throw err;2023  }20242025  // Breach check when password changes: clear immediately so old breach doesn't linger,2026  // then async-check the new password and only re-set if it's also found.2027  if ("password" in patch && settings.breachMonitoring !== false && entries[idx].type === "login") {2028    entries[idx] = { ...entries[idx], breach: undefined };2029    await persistEntries();2030    const password = entries[idx].password;2031    if (password) {2032      checkBreach(password).then(async (count) => {2033        const i = entries.findIndex((e) => e.id === id);2034        if (i !== -1 && count > 0) {2035          entries[i] = { ...entries[i], breach: count, modifiedAt: monotonicEntryTimestamp(entries[i].modifiedAt) };2036          await persistEntries();2037        }2038      });2039    }2040  }20412042  fireSyncTrigger("vault_change");2043}20442045export async function deleteEntry(id: string): Promise<void> {2046  if (!derivedKey) throw new Error("vault_locked");20472048  const entry = entries.find((item) => item.id === id);2049  if (!entry || entry.deletedAt) {2050    throw new Error("entry_not_found");2051  }20522053  // Tombstone timestamp must be strictly greater than the entry's last2054  // modification so the deletion wins LWW against any in-flight edit, even2055  // under clock skew (SEV-2-E).2056  const previousModifiedAt = entry.modifiedAt;2057  const stamp = monotonicEntryTimestamp(entry.modifiedAt);2058  entry.deletedAt = stamp;2059  entry.modifiedAt = stamp;2060  // Roll the tombstone back if the disk write fails, so a quota error doesn't2061  // leave the entry deleted in memory but alive on disk (SEV-3-A).2062  try {2063    await persistEntries();2064  } catch (err) {2065    delete entry.deletedAt;2066    entry.modifiedAt = previousModifiedAt;2067    throw err;2068  }2069  fireSyncTrigger("vault_change");2070}20712072export function getDeletedEntries(): VaultEntry[] {2073  if (!derivedKey) return [];2074  return entries.filter((e) => !!e.deletedAt);2075}20762077/**2078 * Returns the vault's monotonic version — the `peach_last_modified_at` value2079 * stamped on every user-initiated write. Remote (sync) writes do NOT advance2080 * this version so a sync round never cascades into a second outbound sync.2081 */2082export async function getVaultVersion(): Promise<number> {2083  try {2084    const raw = await chrome.storage.local.get("peach_last_modified_at");2085    const v = (raw as Record<string, unknown>).peach_last_modified_at;2086    if (typeof v === "number") return v;2087    if (typeof v === "string" && v !== "") {2088      const n = Number.parseInt(v, 10);2089      return Number.isFinite(n) ? n : 0;2090    }2091    return 0;2092  } catch {2093    return 0;2094  }2095}20962097/**2098 * Internal write variants — bypass `fireSyncTrigger` so the sync layer can2099 * apply entries without cascading into another outbound sync round.2100 *2101 * INVARIANT: callers must not pass entries whose IDs collide with existing2102 * active (non-deleted) entries unless the intent is an explicit overwrite.2103 * These functions do not validate field-level constraints (password required,2104 * card number required, etc.) — they are trust-the-caller paths for sync and2105 * test harness use only.2106 */2107export async function addEntryDirect(entry: VaultEntry): Promise<void> {2108  if (!derivedKey) throw new Error("vault_locked");2109  entries = [...entries, entry];2110  await persistEntries("sync_received");2111}21122113export async function updateEntryDirect(patch: VaultEntry): Promise<void> {2114  if (!derivedKey) throw new Error("vault_locked");2115  const idx = entries.findIndex((e) => e.id === patch.id);2116  if (idx === -1) throw new Error("entry_not_found");2117  entries[idx] = { ...entries[idx], ...patch };2118  await persistEntries("sync_received");2119}21202121export async function deleteEntryDirect(id: string, deletedAt: number): Promise<void> {2122  if (!derivedKey) throw new Error("vault_locked");2123  const idx = entries.findIndex((e) => e.id === id);2124  if (idx === -1) throw new Error("entry_not_found");2125  entries[idx] = { ...entries[idx], deletedAt, modifiedAt: deletedAt };2126  await persistEntries("sync_received");2127}21282129/**2130 * Apply a batch of remote entries + tombstones from a sync peer.2131 * Last-write-wins by `modifiedAt`; a tombstone supersedes a live entry when2132 * `deletedAt > modifiedAt` on the local side. Mutates `entries` directly and2133 * persists with reason `sync_received` — does NOT fire the sync dispatcher, so2134 * applying a sync round cannot cascade into another outbound sync.2135 *2136 * `applied` counts entries that actually changed local state (new add,2137 * overwrite-by-newer, or new tombstone). `received` is the raw payload size2138 * the caller can surface in the sync result UI.2139 */2140export async function applyMergedRemoteEntries(2141  remoteEntries: VaultEntry[],2142  remoteTombstones: Record<string, number>,2143  context: { deviceName?: string } = {},2144): Promise<{ received: number; applied: number; conflicts: number }> {2145  // DESIGN: last-write-wins is applied PER-ENTRY, not per-field. If two devices2146  // concurrently edit different fields of the same entry, the one with the2147  // newer modifiedAt wins the whole entry and the other device's field edits2148  // are dropped silently. This is the deliberate trade-off for a simple,2149  // conflict-free merge — per-field CRDT merge is out of scope. Guidance for2150  // users: edit a given entry on one device at a time.2151  if (!derivedKey) throw new Error("vault_locked");21522153  const received = remoteEntries.length + Object.keys(remoteTombstones).length;2154  let applied = 0;2155  let conflicts = 0;21562157  const byId = new Map<string, VaultEntry>();2158  for (const e of entries) byId.set(e.id, e);21592160  const alerts: SyncAlert[] = [];2161  const deviceName = context.deviceName ?? "paired device";2162  const mergeNow = Date.now();21632164  for (const remote of remoteEntries) {2165    const sanitized = sanitizeRestoredEntry(remote);2166    if (!sanitized) continue;2167    // HV-1a: a far-future remote modifiedAt must not permanently pin a2168    // malicious value against honest local edits. Clamp BEFORE any2169    // comparison against local timestamps.2170    sanitized.modifiedAt = clampSyncTimestamp(sanitized.modifiedAt, mergeNow);2171    if (typeof sanitized.deletedAt === "number") {2172      sanitized.deletedAt = clampSyncTimestamp(sanitized.deletedAt, mergeNow);2173    }2174    const tombstoneTs = remoteTombstones[sanitized.id];2175    if (tombstoneTs !== undefined && clampSyncTimestamp(tombstoneTs, mergeNow) >= sanitized.modifiedAt) {2176      continue;2177    }2178    const local = byId.get(sanitized.id);2179    if (!local) {2180      entries.push(sanitized);2181      byId.set(sanitized.id, sanitized);2182      applied += 1;2183    } else if (sanitized.modifiedAt > local.modifiedAt) {2184      const idx = entries.findIndex((e) => e.id === local.id);2185      if (idx !== -1) {2186        // HV-1b: surface remote password REPLACEMENTS (existing id, password2187        // differs) so a compromised peer can't silently rewrite credentials.2188        if (2189          !local.deletedAt &&2190          typeof sanitized.password === "string" &&2191          typeof local.password === "string" &&2192          sanitized.password !== local.password2193        ) {2194          alerts.push({2195            type: "REMOTE_PASSWORD_CHANGE",2196            entryId: sanitized.id,2197            entryTitle: sanitized.title,2198            deviceName,2199            timestamp: mergeNow,2200          });2201        }2202        entries[idx] = sanitized;2203        byId.set(sanitized.id, sanitized);2204        applied += 1;2205        if (!local.deletedAt) conflicts += 1;2206      }2207    }2208  }22092210  for (const [id, rawDeletedAt] of Object.entries(remoteTombstones)) {2211    if (typeof rawDeletedAt !== "number" || !Number.isFinite(rawDeletedAt)) continue;2212    // HV-1a/1c: clamp the tombstone timestamp before every comparison.2213    const deletedAt = clampSyncTimestamp(rawDeletedAt, mergeNow);2214    const local = byId.get(id);2215    if (!local) continue;2216    if (local.deletedAt && local.deletedAt >= deletedAt) continue;2217    if (deletedAt < local.modifiedAt) continue;2218    const idx = entries.findIndex((e) => e.id === id);2219    if (idx !== -1) {2220      // HV-1b: surface remote deletes of live local entries.2221      if (!local.deletedAt) {2222        alerts.push({2223          type: "REMOTE_DELETE",2224          entryId: id,2225          entryTitle: local.title,2226          deviceName,2227          timestamp: mergeNow,2228        });2229      }2230      entries[idx] = { ...local, deletedAt, modifiedAt: deletedAt };2231      applied += 1;2232    }2233  }22342235  if (applied > 0) {2236    await persistEntries("sync_received");2237    buildDomainIndexSync(entries);2238  }2239  // Queued after the merge committed — an alert must describe a mutation2240  // that actually landed. recordSyncAlerts never throws.2241  await recordSyncAlerts(alerts);2242  return { received, applied, conflicts };2243}22442245export async function restoreEntry(id: string): Promise<void> {2246  if (!derivedKey) throw new Error("vault_locked");2247  const entry = entries.find((e) => e.id === id && e.deletedAt);2248  if (!entry) throw new Error("deleted entry not found");2249  delete entry.deletedAt;2250  entry.modifiedAt = monotonicEntryTimestamp(entry.modifiedAt);2251  await persistEntries();2252  buildDomainIndexSync(entries);2253}22542255export async function purgeEntry(id: string): Promise<void> {2256  if (!derivedKey) throw new Error("vault_locked");2257  const idx = entries.findIndex((e) => e.id === id && e.deletedAt);2258  if (idx === -1) throw new Error("deleted entry not found");2259  entries.splice(idx, 1);2260  await persistEntries();2261}22622263/** Permanently delete entries whose deletedAt is older than retentionMs. 0 = keep forever. */2264export async function purgeExpiredTrash(retentionMs: number): Promise<number> {2265  if (!derivedKey || retentionMs === 0) return 0;2266  const cutoff = Date.now() - retentionMs;2267  const before = entries.length;2268  entries = entries.filter((e) => !(e.deletedAt && e.deletedAt < cutoff));2269  const purged = before - entries.length;2270  if (purged > 0) await persistEntries();2271  return purged;2272}22732274export function queryDomain(domain: string): VaultEntry[] {2275  return domainIndex.get(domain) ?? [];2276}22772278export function getEntryById(id: string): VaultEntry | undefined {2279  return entries.find((entry) => entry.id === id && !entry.deletedAt);2280}22812282async function persistSlotA(2283  reason: VaultSnapshot["reason"] = "local_save",2284): Promise<StoredVault> {2285  if (!derivedKey) throw new Error("vault_locked");22862287  const slotA = await loadSlot(SLOT_A);2288  if (!slotA) throw new Error("missing slot A");22892290  // Snapshot the about-to-be-overwritten state BEFORE we mutate disk. Failures2291  // are swallowed by takeVaultSnapshot — history must never block a save.2292  await takeVaultSnapshot(reason);22932294  const plaintext = encodePayload(entries, duressConfigured, duressConfigured ? DURESS_SLOT_SIZE : 0);2295  const { nonce, ciphertext, tag } = await encrypt(derivedKey, plaintext, "slot_a_v1");22962297  // Preserve existing recovery escrow fields.2298  const nextSlotA: StoredVault = {2299    ...slotA,2300    nonce,2301    ciphertext,2302    tag,2303    // recovery_salt and recovery_wrapped_root_key are already set from loadSlot2304  };2305  await writeSlot(SLOT_A, nextSlotA);23062307  // Slot A (the real vault) is now committed. Wrap every later write so a2308  // mid-persist failure (e.g. a storage error after slot A landed) restores the2309  // prior slot A before rethrowing. Without this, a "failed" save that already2310  // wrote slot A leaves disk ahead of the in-memory rollback in addEntry/2311  // updateEntry/deleteEntry — the entry stays silently on disk and resurfaces2312  // as a duplicate on the next unlock (observed under storage-quota pressure).2313  try {2314    // When duress is not configured, keep slot B size-matched with slot A by2315    // regenerating its noise. When duress IS configured, leave slot B alone —2316    // we don't have the decoy key to re-encrypt it. This is a known trade-off.2317    if (!duressConfigured) {2318      await writeSlot(SLOT_B, generateNoiseBlob(ciphertext.length / 2));2319    }2320    // Only advance the vault version for locally-originated writes. Entries2321    // applied from a sync peer ("sync_received") must NOT bump the counter —2322    // otherwise applying a remote round makes us look newer than the peer and2323    // triggers a redundant outbound sync, defeating the no-op optimisation2324    // and risking a ping-pong between two devices (SEV-2-C).2325    if (reason !== "sync_received") {2326      await stampLocalVaultMutation();2327    }2328  } catch (err) {2329    // Best-effort restore — the prior slot A is smaller-or-equal, so this write2330    // fits even when the failure was a quota overflow.2331    await writeSlot(SLOT_A, slotA).catch(() => {});2332    throw err;2333  }23342335  return nextSlotA;2336}23372338async function persistSlotB(): Promise<void> {2339  if (!derivedKey) throw new Error("vault_locked");23402341  const slotB = await loadSlot(SLOT_B);2342  if (!slotB) throw new Error("missing slot B");23432344  // Decoy plaintext always reports duressConfigured=false — the decoy user2345  // sees a clean slate. persistSlotB only runs in decoy mode, which only2346  // exists once duress is configured, so pad to the fixed duress ceiling to2347  // keep slot B's length equal to slot A's (audit MEDIUM — deniability).2348  const plaintext = encodePayload(entries, false, DURESS_SLOT_SIZE);2349  const { nonce, ciphertext, tag } = await encrypt(derivedKey, plaintext, "slot_b_v1");23502351  await writeSlot(SLOT_B, { ...slotB, nonce, ciphertext, tag });2352  // Symmetric with persistSlotA: if the version stamp fails after the decoy2353  // slot committed, restore the prior slot B so a failed decoy-mode save can't2354  // leave disk ahead of the in-memory rollback.2355  try {2356    await stampLocalVaultMutation();2357  } catch (err) {2358    await writeSlot(SLOT_B, slotB).catch(() => {});2359    throw err;2360  }2361}23622363async function persistEntries(2364  reason: VaultSnapshot["reason"] = "local_save",2365): Promise<void> {2366  if (!derivedKey) throw new Error("vault_locked");23672368  if (vaultMode === "decoy") {2369    await persistSlotB();2370  } else {2371    await persistSlotA(reason);2372  }2373  buildDomainIndexSync(entries);2374}23752376function cleanAdditionalUrls(values: string[] | undefined): string[] | undefined {2377  if (!Array.isArray(values)) return undefined;2378  const seen = new Set<string>();2379  const cleaned: string[] = [];2380  for (const value of values) {2381    const trimmed = typeof value === "string" ? value.trim() : "";2382    if (!trimmed) continue;2383    const key = trimmed.toLowerCase();2384    if (seen.has(key)) continue;2385    seen.add(key);2386    cleaned.push(trimmed);2387  }2388  return cleaned.length > 0 ? cleaned : undefined;2389}23902391function sanitizeEntryDraft(entry: EntryDraft): EntryDraft {2392  const title = entry.title.trim();2393  // Accept legacy `type:"passkey"` drafts but rewrite to "login" — the new2394  // model is "any entry, optionally with a passkey sub-object." Imports and2395  // any in-flight callers from before v2.11.0 keep working without throwing.2396  let type: VaultEntry["type"] = entry.type ?? "login";2397  if (type === "passkey") type = "login";23982399  if (!title) throw new Error("title is required");24002401  if (entry.passkey) {2402    const p = entry.passkey;2403    if (2404      !p.rpId ||2405      !p.credentialId ||2406      !p.publicKeyCose ||2407      !p.userHandle ||2408      !p.userName ||2409      (p.algorithm !== -7 && p.algorithm !== -8)2410    ) {2411      throw new Error("invalid passkey credential");2412    }2413  }2414  if (type === "card") {2415    if (!entry.cardholderName?.trim() || !entry.cardNumber?.trim()) {2416      throw new Error("cardholder name and card number are required");2417    }2418  }24192420  return {2421    type,2422    title,2423    username: type === "login" ? entry.username?.trim() ?? "" : undefined,2424    email: type === "login" ? entry.email?.trim() || undefined : undefined,2425    password: type === "login" ? entry.password : undefined,2426    url: type === "login" ? entry.url?.trim() ?? "" : undefined,2427    additionalUrls: type === "login" ? cleanAdditionalUrls(entry.additionalUrls) : undefined,2428    totp: type === "login" ? entry.totp?.trim() || undefined : undefined,2429    // PCH-01-019: preserve non-default TOTP params through batch-add/import so2430    // they are not silently stripped (they fall back to SHA-1/6/30 when absent).2431    totpAlgorithm: type === "login" ? entry.totpAlgorithm : undefined,2432    totpDigits: type === "login" ? entry.totpDigits : undefined,2433    totpPeriod: type === "login" ? entry.totpPeriod : undefined,2434    notes: entry.notes?.trim() || undefined,2435    breach: type === "login" ? entry.breach : undefined,2436    // PCH-01-016: the batch-add path was bypassing the MV-6 canary/tags2437    // whitelist applied on the RESTORE_ENTRIES path. Run both sanitizers here.2438    canary: type === "login" ? sanitizeCanary(entry.canary) : undefined,2439    tags: sanitizeTags(entry.tags),2440    passkey: entry.passkey,2441    cardholderName: type === "card" ? entry.cardholderName?.trim() : undefined,2442    cardNumber: type === "card" ? entry.cardNumber?.trim() : undefined,2443    expMonth: type === "card" ? entry.expMonth?.trim() : undefined,2444    expYear: type === "card" ? entry.expYear?.trim() : undefined,2445    cvc: type === "card" ? entry.cvc?.trim() : undefined,2446    cardNickname: type === "card" ? entry.cardNickname?.trim() || undefined : undefined,2447    network: type === "card" ? entry.network : undefined,2448    last4: type === "card" ? entry.last4?.trim() : undefined,2449  };2450}24512452function sanitizeEntryPatch(patch: Partial<VaultEntry>): Partial<VaultEntry> {2453  const nextPatch: Partial<VaultEntry> = {};24542455  if ("type" in patch) {2456    nextPatch.type = patch.type;2457  }24582459  if ("title" in patch) {2460    const title = patch.title?.trim() ?? "";2461    if (!title) throw new Error("title is required");2462    nextPatch.title = title;2463  }24642465  if ("url" in patch) {2466    nextPatch.url = patch.url?.trim() ?? "";2467  }24682469  if ("additionalUrls" in patch) {2470    const incoming = Array.isArray(patch.additionalUrls) ? patch.additionalUrls : [];2471    const seen = new Set<string>();2472    const cleaned: string[] = [];2473    for (const value of incoming) {2474      const trimmed = typeof value === "string" ? value.trim() : "";2475      if (!trimmed) continue;2476      const key = trimmed.toLowerCase();2477      if (seen.has(key)) continue;2478      seen.add(key);2479      cleaned.push(trimmed);2480    }2481    nextPatch.additionalUrls = cleaned.length > 0 ? cleaned : undefined;2482  }24832484  if ("username" in patch) {2485    nextPatch.username = patch.username?.trim() ?? "";2486  }24872488  if ("email" in patch) {2489    nextPatch.email = patch.email?.trim() || undefined;2490  }24912492  if ("password" in patch) {2493    const password = patch.password ?? "";2494    // Allow clearing a password (e.g. on passkey-only entries)2495    nextPatch.password = password || undefined;2496  }24972498  if ("totp" in patch) {2499    nextPatch.totp = patch.totp?.trim() || undefined;2500  }25012502  if ("notes" in patch) {2503    nextPatch.notes = patch.notes?.trim() || undefined;2504  }25052506  if ("breach" in patch) {2507    nextPatch.breach = patch.breach;2508  }25092510  if ("canary" in patch) {2511    // PCH-02-001: route update patches through the same canary whitelist used2512    // by add/restore/sync. Invalid shapes drop the canary; `undefined` clears it.2513    nextPatch.canary = patch.canary ? sanitizeCanary(patch.canary) : undefined;2514  }25152516  if ("passkey" in patch) {2517    // Passkey sub-object replaces all the legacy flat passkey fields. A2518    // patch with `passkey: undefined` removes the credential from the entry2519    // (used by "remove passkey" without deleting the whole entry).2520    if (patch.passkey === undefined || patch.passkey === null) {2521      nextPatch.passkey = undefined;2522    } else {2523      const sanitized = sanitizePasskey(patch.passkey);2524      if (!sanitized) throw new Error("invalid passkey credential");2525      nextPatch.passkey = sanitized;2526    }2527  }25282529  if ("tags" in patch) {2530    // PCH-02-001: bound tags exactly like both import funnels.2531    nextPatch.tags = sanitizeTags(patch.tags);2532  }25332534  if ("cardholderName" in patch) {2535    nextPatch.cardholderName = patch.cardholderName?.trim() || undefined;2536  }2537  if ("cardNumber" in patch) {2538    const n = patch.cardNumber ?? "";2539    nextPatch.cardNumber = n || undefined;2540  }2541  if ("expMonth" in patch) {2542    nextPatch.expMonth = patch.expMonth?.trim() || undefined;2543  }2544  if ("expYear" in patch) {2545    nextPatch.expYear = patch.expYear?.trim() || undefined;2546  }2547  if ("cvc" in patch) {2548    nextPatch.cvc = patch.cvc?.trim() || undefined;2549  }2550  if ("cardNickname" in patch) {2551    nextPatch.cardNickname = patch.cardNickname?.trim() || undefined;2552  }2553  if ("network" in patch) {2554    nextPatch.network = patch.network;2555  }2556  if ("last4" in patch) {2557    nextPatch.last4 = patch.last4?.trim() || undefined;2558  }25592560  return nextPatch;2561}25622563function normalizeEntry(entry: VaultEntry | LegacyVaultEntry): VaultEntry {2564  const createdAt = "createdAt" in entry ? entry.createdAt : entry.created;2565  const modifiedAt =2566    "modifiedAt" in entry ? entry.modifiedAt : entry.updated;25672568  const base: VaultEntry = {2569    id: entry.id,2570    type: "type" in entry ? entry.type : "login",2571    title: entry.title,2572    username: entry.username,2573    email: "email" in entry ? entry.email : undefined,2574    password: entry.password,2575    url: entry.url,2576    additionalUrls:2577      "additionalUrls" in entry && Array.isArray(entry.additionalUrls)2578        ? entry.additionalUrls2579        : undefined,2580    totp: entry.totp,2581    // PCH-01-019: carry TOTP params through the normalize/restore path too.2582    totpAlgorithm: entry.totpAlgorithm,2583    totpDigits: entry.totpDigits,2584    totpPeriod: entry.totpPeriod,2585    notes: entry.notes,2586    breach: entry.breach,2587    // Preserve the password-age clock across lock/unlock. Without this the2588    // field is dropped on every decode and the advanced-health "aged password"2589    // signal silently resets to createdAt on each unlock (SEV-2-A).2590    passwordChangedAt:2591      "passwordChangedAt" in entry ? entry.passwordChangedAt : undefined,2592    // Preserve past-password history across lock/unlock. normalizeEntry is a2593    // field whitelist, so an unlisted field is silently dropped on every decode2594    // (same class as the passwordChangedAt SEV-2-A above).2595    passwordHistory:2596      "passwordHistory" in entry && Array.isArray(entry.passwordHistory)2597        ? entry.passwordHistory2598        : undefined,2599    canary: "canary" in entry ? entry.canary : undefined,2600    passkey: "passkey" in entry ? entry.passkey : undefined,2601    createdAt,2602    modifiedAt,2603    deletedAt: entry.deletedAt,2604    tags: "tags" in entry ? entry.tags : undefined,2605    cardholderName: "cardholderName" in entry ? entry.cardholderName : undefined,2606    cardNumber: "cardNumber" in entry ? entry.cardNumber : undefined,2607    expMonth: "expMonth" in entry ? entry.expMonth : undefined,2608    expYear: "expYear" in entry ? entry.expYear : undefined,2609    cvc: "cvc" in entry ? entry.cvc : undefined,2610    cardNickname: "cardNickname" in entry ? entry.cardNickname : undefined,2611    network: "network" in entry ? entry.network : undefined,2612    last4: "last4" in entry ? entry.last4 : undefined,2613  };26142615  return migrateLegacyPasskey(base, entry);2616}26172618/**2619 * v2.11.0 read migration. Pre-v2.11.0 passkey entries used `type:"passkey"`2620 * with flat top-level fields (rpId, credentialId, etc.). This converts them2621 * to the new shape — `type:"login"` with a `passkey` sub-object — so all2622 * downstream consumers can rely on the new model. The result is rewritten2623 * to disk on next vault save (hasLegacyShape detects the un-migrated case).2624 */2625function migrateLegacyPasskey(2626  base: VaultEntry,2627  raw: VaultEntry | LegacyVaultEntry2628): VaultEntry {2629  if (base.passkey) return base;2630  const flat = raw as Partial<VaultEntry>;2631  const isPasskeyType = base.type === "passkey";2632  const hasFlatPasskeyFields =2633    typeof flat.rpId === "string" &&2634    typeof flat.credentialId === "string" &&2635    typeof flat.publicKeyCose === "string" &&2636    typeof flat.userHandle === "string" &&2637    typeof flat.userName === "string";2638  if (!isPasskeyType && !hasFlatPasskeyFields) return base;2639  if (!hasFlatPasskeyFields) return base;26402641  const algorithm: -7 | -8 = flat.algorithm === -8 ? -8 : -7;2642  base.passkey = {2643    rpId: flat.rpId!,2644    rpName: flat.rpName ?? flat.rpId!,2645    credentialId: flat.credentialId!,2646    publicKeyCose: flat.publicKeyCose!,2647    privateKeyJwk: flat.privateKeyJwk,2648    userHandle: flat.userHandle!,2649    userName: flat.userName!,2650    userDisplayName: flat.userDisplayName ?? flat.userName!,2651    algorithm,2652    signCount: flat.signCount ?? 0,2653    aaguid: flat.aaguid ?? "",2654    backupEligible: flat.backupEligible === true,2655    backupState: flat.backupState === true,2656    lastUsedAt: flat.lastUsedAt,2657    browser: flat.browser,2658    transports: flat.transports,2659    createdAt: base.createdAt,2660  };2661  // Promote to "login" so the unified Entry view renders. Username gets2662  // populated from the passkey's userName so the entry is searchable in the2663  // existing autofill flow without a separate code path.2664  if (isPasskeyType) base.type = "login";2665  if (!base.username) base.username = flat.userName;2666  if (!base.url) base.url = `https://${flat.rpId}`;2667  return base;2668}266926702671// ---------------------------------------------------------------------------2672// Deduplication2673// ---------------------------------------------------------------------------26742675function entryDupeKey(e: VaultEntry): string {2676  if (e.type === "note") return `note|${e.title.toLowerCase()}`;2677  // Passkey-bearing entries dedupe by the credential's RP + user. Two logins2678  // on different sites that happen to share a username are still distinct;2679  // two passkey credentials for the same RP+user are duplicates regardless2680  // of any login fields they may also carry.2681  if (e.passkey) {2682    return `passkey|${e.passkey.rpId.toLowerCase()}|${e.passkey.userName.toLowerCase()}`;2683  }2684  return `login|${e.title.toLowerCase()}|${(e.url ?? "").toLowerCase()}|${(e.username ?? "").toLowerCase()}`;2685}26862687/** Returns the number of duplicate entries (those that would be removed). */2688export function countDuplicates(): number {2689  const best = new Map<string, VaultEntry>();2690  let dupeCount = 0;2691  for (const e of entries.filter((e) => !e.deletedAt)) {2692    const key = entryDupeKey(e);2693    const existing = best.get(key);2694    if (!existing) {2695      best.set(key, e);2696    } else {2697      dupeCount++;2698      // Keep the more recently modified one in the map2699      if ((e.modifiedAt ?? e.createdAt ?? 0) > (existing.modifiedAt ?? existing.createdAt ?? 0)) {2700        best.set(key, e);2701      }2702    }2703  }2704  return dupeCount;2705}27062707/**2708 * Soft-deletes duplicate entries, keeping the most recently modified copy of2709 * each group. Returns the number of entries moved to trash.2710 */2711export async function deduplicateEntries(): Promise<number> {2712  if (!derivedKey) throw new Error("vault_locked");2713  // Dedup reshapes slot B permanently under the decoy key, which is2714  // forensically distinguishable from a freshly-seeded decoy vault. Refuse.2715  if (vaultMode === "decoy") {2716    throw new Error("deduplicate disabled in decoy mode");2717  }27182719  const best = new Map<string, VaultEntry>();2720  for (const e of entries.filter((en) => !en.deletedAt)) {2721    const key = entryDupeKey(e);2722    const existing = best.get(key);2723    if (!existing) {2724      best.set(key, e);2725    } else if ((e.modifiedAt ?? e.createdAt ?? 0) > (existing.modifiedAt ?? existing.createdAt ?? 0)) {2726      best.set(key, e);2727    }2728  }27292730  const keepIds = new Set(Array.from(best.values()).map((e) => e.id));2731  let removed = 0;2732  entries = entries.map((e) => {2733    if (!e.deletedAt && !keepIds.has(e.id)) {2734      removed++;2735      return { ...e, deletedAt: monotonicEntryTimestamp(e.modifiedAt) };2736    }2737    return e;2738  });27392740  if (removed > 0) await persistEntries();2741  return removed;2742}27432744// ---------------------------------------------------------------------------2745// Vault history — snapshot BEFORE every vault write so the saved blob is2746// what is about to be lost, not what was just written. Capped at 5. The2747// stored blobs are AES-256-GCM ciphertext under the master password, so2748// history adds zero security surface.2749// ---------------------------------------------------------------------------27502751const HISTORY_KEY = "peach_vault_history";2752const HISTORY_MAX = 5;27532754// PCH-01-023: coarsen a live-entry count into a low-resolution bucket so the2755// plaintext snapshot field cannot reveal exact vault size or single-entry change2756// deltas. Buckets widen as the vault grows so absolute leakage stays roughly2757// proportional rather than exact.2758function bucketEntryCount(n: number): number {2759  if (n <= 0) return 0;2760  if (n <= 10) return 10;2761  if (n <= 25) return 25;2762  if (n <= 50) return 50;2763  if (n <= 100) return 100;2764  if (n <= 250) return 250;2765  if (n <= 500) return 500;2766  return Math.ceil(n / 500) * 500;2767}27682769/**2770 * Snapshot the CURRENT on-disk vault state into history. Call this BEFORE2771 * overwriting peach_vault_a so the saved blob captures the about-to-be-lost2772 * state. Identical-to-most-recent blobs are skipped to avoid filling history2773 * with no-op writes.2774 */2775export async function takeVaultSnapshot(2776  reason: VaultSnapshot["reason"],2777): Promise<void> {2778  try {2779    const raw = await chrome.storage.local.get([SLOT_A, SLOT_B, HISTORY_KEY]);2780    const slotA = (raw as Record<string, StoredVault | undefined>)[SLOT_A];2781    const slotB = (raw as Record<string, StoredVault | undefined>)[SLOT_B];27822783    // Nothing to snapshot if the real slot doesn't exist yet (fresh install,2784    // pre-createVault). createVault skips snapshots intentionally — there is2785    // no prior state to preserve.2786    if (!slotA) return;27872788    const vault_a = JSON.stringify(slotA);2789    const vault_b = JSON.stringify(slotB ?? slotA);27902791    // Best-effort entry count: only meaningful when the in-memory state is2792    // unlocked AND in real mode. Decoy mode would leak the decoy entry2793    // count; locked mode has no entries to count. Both fall through to null.2794    // PCH-01-023: store a coarse bucket, not the exact count — chrome.storage2795    // .local sits next to the AES-GCM blobs in plaintext, so an exact count would2796    // leak vault size and per-write deltas (the metadata padding hides this).2797    let entryCount: number | null = null;2798    if (derivedKey && vaultMode === "real") {2799      try {2800        entryCount = bucketEntryCount(entries.filter((e) => !e.deletedAt).length);2801      } catch {2802        entryCount = null;2803      }2804    }28052806    const existingRaw = (raw as Record<string, VaultHistory | undefined>)[HISTORY_KEY];2807    const history: VaultHistory = existingRaw && Array.isArray(existingRaw.snapshots)2808      ? existingRaw2809      : { snapshots: [] };28102811    // Deduplication: if the most recent snapshot has byte-identical blobs,2812    // skip — saves the same vault N times in a row would otherwise burn the2813    // entire history window with no recovery value.2814    const latest = history.snapshots[0];2815    if (latest && latest.vault_a === vault_a && latest.vault_b === vault_b) {2816      return;2817    }28182819    const snapshot: VaultSnapshot = {2820      id: crypto.randomUUID(),2821      savedAt: Date.now(),2822      reason,2823      vault_a,2824      vault_b,2825      entryCount,2826    };28272828    history.snapshots = [snapshot, ...history.snapshots].slice(0, HISTORY_MAX);2829    await chrome.storage.local.set({ [HISTORY_KEY]: history });2830  } catch (err) {2831    // Non-fatal — history must never block a save. A failed snapshot just2832    // means the user loses one rung of the safety ladder for this write.2833    // M4/QUA-006: log so the failure is visible; if it looks like a quota2834    // problem, notify the popup so the user can prune history themselves.2835    console.warn('[Peach] takeVaultSnapshot failed:', err);2836    if (String(err).includes('QUOTA') || String(err).includes('quota')) {2837      try {2838        await chrome.runtime.sendMessage({ type: 'VAULT_STORAGE_QUOTA_WARNING' });2839      } catch {2840        // popup may be closed; surfaced via console.warn above2841      }2842    }2843  }2844}28452846/** Wipe all vault history. Called by Panic / DESTROY_VAULT. */2847export async function clearVaultHistory(): Promise<void> {2848  try {2849    await chrome.storage.local.set({ [HISTORY_KEY]: { snapshots: [] } satisfies VaultHistory });2850  } catch {2851    // Non-fatal — DESTROY_VAULT also runs storage.local.clear().2852  }2853}28542855/** Read all snapshots, newest first, for the Settings vault history view. */2856export async function getVaultHistory(): Promise<VaultSnapshot[]> {2857  const raw = await chrome.storage.local.get(HISTORY_KEY);2858  const history = (raw as Record<string, VaultHistory | undefined>)[HISTORY_KEY];2859  if (!history || !Array.isArray(history.snapshots)) return [];2860  return history.snapshots;2861}28622863/**2864 * Replace the on-disk vault with the chosen snapshot's blobs and lock the2865 * vault. The current state is itself snapshotted with reason 'restore' first2866 * so the restore is reversible. After this returns, the user must unlock2867 * with the password that matches the restored blob.2868 */2869export async function restoreVaultSnapshot(2870  snapshotId: string,2871): Promise<{ ok: true } | { ok: false; error: string }> {2872  const history = await getVaultHistory();2873  const snapshot = history.find((s) => s.id === snapshotId);2874  if (!snapshot) return { ok: false, error: "snapshot_not_found" };28752876  // Snapshot the about-to-be-replaced current state so the restore is2877  // reversible. takeVaultSnapshot is no-op when the most recent entry is2878  // byte-identical, so a restore-of-a-restore stays clean.2879  await takeVaultSnapshot("restore");28802881  let restoredA: StoredVault;2882  let restoredB: StoredVault;2883  try {2884    restoredA = JSON.parse(snapshot.vault_a) as StoredVault;2885    restoredB = JSON.parse(snapshot.vault_b) as StoredVault;2886  } catch {2887    return { ok: false, error: "snapshot_corrupt" };2888  }28892890  await writeSlot(SLOT_A, restoredA);2891  await writeSlot(SLOT_B, restoredB);2892  await stampLocalVaultMutation();28932894  // Lock so the user must prove they can decrypt the restored blob. If they2895  // restored a pre-password-change snapshot they discover it immediately at2896  // the lock screen rather than silently holding an inaccessible vault.2897  lock();28982899  return { ok: true };2900}29012902/**2903 * Rotate the vault's sync identity by generating a FRESH ROOT KEY and2904 * re-wrapping everything under it (MV-8). Because every sync credential —2905 * vault_id, the Noise XX static keypair, the Ed25519 manifest signing key,2906 * and the per-entry envelope keys — derives from the root key, rotation2907 * makes a lost/stolen device's retained key material useless. All paired2908 * devices must re-pair afterwards.2909 *2910 * CONSEQUENCE THE UI MUST SURFACE: the 12 recovery words also derive from2911 * the root key, so rotation INVALIDATES the old recovery phrase. The flow2912 * sets peach_recovery_pending so the popup re-presents the new words for2913 * confirmation, same as the migrateToRecovery rotate path.2914 */2915export async function rotateSyncIdentity(): Promise<{ ok: boolean; error?: string }> {2916  if (!derivedKey || vaultMode !== "real") {2917    return { ok: false, error: "vault_locked" };2918  }2919  const slotA = await loadSlot(SLOT_A);2920  if (!slotA) return { ok: false, error: "missing_slot_a" };29212922  // 1. Fresh root key + recovery escrow (new words).2923  const { rawRootKey, recoverySalt, wrappedRootKey, wrappedNonce, wrappedTag } =2924    await generateAndWrapRootKey();29252926  // 2. Re-wrap the new root key under the current password-derived key.2927  const newRootKey = unhex(rawRootKey);2928  const pwRoot = await wrapRootKeyForDerivedKey(derivedKey, newRootKey);29292930  // 3. Snapshot, then single atomic slot write — both escrow wrappings of2931  //    the new root key land together (same transactional rule as2932  //    changePassword). Entries are untouched: they are sealed under the2933  //    password-derived key, not the root key.2934  await takeVaultSnapshot("local_save");2935  const nextSlotA: StoredVault = {2936    ...slotA,2937    recovery_salt: recoverySalt,2938    recovery_wrapped_root_key: wrappedRootKey,2939    recovery_nonce: wrappedNonce,2940    recovery_tag: wrappedTag,2941    ...pwRoot,2942  };2943  await writeSlot(SLOT_A, nextSlotA);29442945  // 4. Swap in memory only after disk committed.2946  if (rootKey) zeroKey(rootKey);2947  rootKey = newRootKey;29482949  // 5. Old peers' identities derive from the dead root key — drop them all.2950  const { clearPairedDevices } = await import("./paired-devices");2951  await clearPairedDevices();29522953  // 6. Force re-presentation of the NEW recovery words on next popup view.2954  await setRecoveryConfirmPending(); // same flag the create-vault flow uses29552956  await stampLocalVaultMutation();2957  return { ok: true };2958}29592960/**2961 * Change the master password. Re-encrypts slot A with a fresh salt + new2962 * derived key. Slot B (duress or noise) is left untouched when duress is2963 * configured — it uses an independent key derived from the duress password —2964 * and regenerated as noise when duress is not configured.2965 */2966export async function changePassword(2967  currentPassword: string,2968  newPassword: string2969): Promise<boolean> {2970  if (!derivedKey || vaultMode !== "real") return false;29712972  // Verify current password before allowing any change2973  const valid = await verifyMainPassword(currentPassword);2974  if (!valid) return false;29752976  const slotA = await loadSlot(SLOT_A);2977  if (!slotA) return false;2978  if (!rootKey) return false;29792980  // Derive fresh key from new password + new random salt2981  const newSalt = generateSalt();2982  const newKey = await deriveKey(newPassword, newSalt);29832984  // Re-encrypt the in-memory entries with the new key2985  const plaintext = encodePayload(entries, duressConfigured, duressConfigured ? DURESS_SLOT_SIZE : 0);2986  const { nonce, ciphertext, tag } = await encrypt(newKey, plaintext, "slot_a_v1");29872988  // Pre-wrap root key under the new derived key. Recovery fields wrap rootKey2989  // under recovery words and remain untouched — recovery phrase keeps working2990  // across password changes (H4/COR-002).2991  const pwRoot = await wrapRootKeyForDerivedKey(newKey, rootKey);29922993  const finalSlotA: StoredVault = {2994    ...slotA,2995    salt: hex(newSalt),2996    nonce,2997    ciphertext,2998    tag,2999    ...pwRoot,3000  };30013002  // Snapshot the OLD-key blob before overwriting it. If the user later3003  // restores from this snapshot they will need the OLD password — the3004  // post-restore lock surfaces that immediately.3005  await takeVaultSnapshot("local_save");30063007  // Single atomic write: ciphertext, salt, and pw_root_* fields all land in3008  // one storage transaction. An SW kill before this point leaves the old3009  // slot intact; after this point everything tied to the new password is3010  // already on disk together (M6/COR-004).3011  await writeSlot(SLOT_A, finalSlotA);30123013  // Swap the in-memory key synchronously before any further await. If we3014  // threw between the Slot A write and this swap, the next persistEntries()3015  // would overwrite Slot A with old-key ciphertext, locking the user out.3016  zeroKey(derivedKey);3017  derivedKey = newKey;30183019  // PCH-01-008: the MV3 session escrow still holds the OLD key. Without this,3020  // the next service-worker restore decrypts the new-key Slot A with the stale3021  // key, fails tryDecryptSlotResult, and silently drops the user to a lock3022  // screen. Re-escrow the new key so restore survives a password change.3023  void saveSessionKey(newKey, "real");30243025  // Regenerate noise for slot B when duress is not in use. Runs after the3026  // key swap so a failure here is a disposable noise regeneration, not a3027  // lockout.3028  if (!duressConfigured) {3029    await writeSlot(SLOT_B, generateNoiseBlob(ciphertext.length / 2));3030  }3031  await stampLocalVaultMutation();30323033  return true;3034}