relay-adoption-bg.ts

1import { generateKeyPair } from "@stablelib/x25519";2import {3  createPairingInvitation,4  pairingInvitationUrl,5  parsePairingInvitation,6} from "../shared/pairing-invitation";7import {8  openRelayPairingSocket,9  type PairingSocket,10} from "../shared/pairing-dial";11import {12  noiseNKResponder,13  type NoiseNKSession,14} from "../shared/noise-js";15import {16  grantAdoption,17  isAdoptDeviceManifestFrame,18  isAdoptRequest,19  isAdoptSnapshotApplied,20  receiveFrame,21  receiveVaultSnapshot,22  requestAdoption,23  sendFrame,24  sendVaultSnapshot,25  type AdoptRequest,26} from "../shared/vault-adopt";27import {28  derivePairingSAS,29  type PairingTransport,30} from "../shared/pairing-handshake";31import type { PairedDevice } from "../shared/sync-types";32import {33  bytesToHex,34  deriveRendezvousSecret,35  generatePairingRendezvousToken,36} from "../shared/rendezvous";37import {38  buildLocalIdentity,39  getDeviceName,40  getLocalPairingIdentity,41  rotateDeviceId,42} from "./device-identity";43import { getSyncSettings, relayInForce } from "./sync-settings";44import { activateLicense, getLicenseKey, isProUser } from "./license";45import { createVaultFromRootKey, exportDuressSlotForAdoption, getRootKeyHex, installAdoptedDuressSlot, isUnlocked, rollbackAdoptedVault } from "./vault";46import { deferAutoLockForOperation } from "./alarms";47import { computeVaultId } from "../shared/sync-identity";48import { INITIAL_SYNC_PENDING_DEVICE_KEY } from "../shared/initial-sync";49import { storageRemove, storageSet } from "../shared/storage";50import { markLastSyncedAt, upsertPairedDevice } from "./paired-devices";51import { isValidPairSecret, setPairSecret } from "./pair-secrets";52import { createSyncVaultAdapter } from "./sync-vault-adapter";53import { triggerSyncIfReachable } from "./sync-trigger";54import { schedulePostAdoptionSync } from "./sync-alarm";5556const SOURCE_WINDOW_MS = 5 * 60 * 1000;5758function push(type: string, payload: unknown): void {59  try {60    const maybe = chrome.runtime.sendMessage({ type, payload }) as unknown;61    if (maybe && typeof (maybe as Promise<unknown>).catch === "function") {62      (maybe as Promise<unknown>).catch(() => undefined);63    }64  } catch {65    // The popup may have closed. The pending approval fails closed on cleanup.66  }67}6869/** Race a promise against a wall-clock deadline; rejects with "timeout". */70function withTimeout<T>(promise: Promise<T>, ms: number): Promise<T> {71  return new Promise<T>((resolve, reject) => {72    const timer = setTimeout(() => reject(new Error("timeout")), ms);73    promise.then(74      (value) => {75        clearTimeout(timer);76        resolve(value);77      },78      (error) => {79        clearTimeout(timer);80        reject(error);81      },82    );83  });84}8586let inFlight = false;87let activeSocket: PairingSocket | null = null;88// Outstanding source-side SAS confirmations, keyed by id. A map (vs the89// receiver's single slot) makes a stale decision from a previous source90// session impossible to land on the current one even if both run on the91// same background worker.92const pendingSourceSasConfirmation = new Map<string, { resolve: (ok: boolean) => void }>();93const pendingReceiverSasConfirmation = new Map<string, { sas: string; resolve: (ok: boolean) => void }>();9495export function isRelayAdoptionSourceInFlight(): boolean {96  return inFlight;97}9899/**100 * Occupy the non-buffering room before returning the invitation to the UI.101 * All long-term key material remains in the background service worker.102 */103export async function startRelayAdoptionSource(): Promise<{104  invitation: string;105}> {106  if (inFlight) throw new Error("adoption_source_in_progress");107  if (!isUnlocked()) throw new Error("vault_locked");108  inFlight = true;109  const releaseAutoLock = deferAutoLockForOperation(SOURCE_WINDOW_MS);110111  let local: Awaited<ReturnType<typeof getLocalPairingIdentity>> | null = null;112  try {113    const settings = await getSyncSettings();114    const relayUrl = relayInForce(settings);115    local = await getLocalPairingIdentity();116    const token = generatePairingRendezvousToken();117    // Source side has the vault — caller checked isUnlocked — so the phone118    // can read the invitation and know it should receive the vault.119    const encoded = createPairingInvitation(relayUrl, token, "populated", bytesToHex(local.publicKey));120    const invitation = parsePairingInvitation(encoded);121    if (!invitation) throw new Error("invitation_generation_failed");122123    const socket = await openRelayPairingSocket(pairingInvitationUrl(invitation));124    activeSocket = socket;125    const readyLocal = local;126    void runSourceSession(127      socket,128      token,129      relayUrl,130      readyLocal,131    ).finally(() => {132      readyLocal.privateKey.fill(0);133      readyLocal.publicKey.fill(0);134      clearState();135      releaseAutoLock();136    });137    return { invitation: encoded };138  } catch (error) {139    local?.privateKey.fill(0);140    local?.publicKey.fill(0);141    clearState();142    releaseAutoLock();143    throw error;144  }145}146147export function cancelRelayAdoptionSource(): void {148  activeSocket?.close();149  clearState();150}151152/**153 * Onboarding pairing request — the empty extension shows a QR and the populated154 * phone scans it. The invitation carries `vaultStatus: "empty"`, which the155 * phone reads to switch into source mode and `grantAdoption` over the156 * established Noise channel. The receiver's `runReceiverSession` accepts the157 * root key and creates a local vault wrapped with the popup-supplied password.158 *159 * `password` is the local-only password the user picked on the "Set a password160 * for this device" screen; it wraps the adopted root key at rest and has no161 * relationship to the source device's password.162 */163export async function startRelayAdoptionReceiver(164  password: string,165): Promise<{ invitation: string }> {166  if (inFlight) throw new Error("adoption_receiver_in_progress");167  if (typeof password !== "string" || password.length === 0) {168    throw new Error("ADOPT_INVALID_PASSWORD");169  }170  inFlight = true;171  try {172    const settings = await getSyncSettings();173    const relayUrl = relayInForce(settings);174    const token = generatePairingRendezvousToken();175    const ephemeral = generateKeyPair();176    const encoded = createPairingInvitation(relayUrl, token, "empty", bytesToHex(ephemeral.publicKey));177    const invitation = parsePairingInvitation(encoded);178    if (!invitation) throw new Error("invitation_generation_failed");179    const socket = await openRelayPairingSocket(pairingInvitationUrl(invitation));180    activeSocket = socket;181    void runReceiverSession(182      socket,183      token,184      relayUrl,185      password,186      ephemeral,187    ).finally(() => {188      ephemeral.secretKey.fill(0);189      ephemeral.publicKey.fill(0);190      clearState();191    });192    return { invitation: encoded };193  } catch (error) {194    clearState();195    throw error;196  }197}198199/**200 * Resolves the source-side SAS confirmation by id. Called by the message201 * handler when the popup taps Confirm/Cancel on the source's SAS screen.202 * Returns true if the id matched an in-flight confirmation. Unknown ids203 * (already resolved, timed out, or never existed) are a no-op so a late204 * popup click cannot crash anything.205 */206export function resolveSourceSasConfirmation(id: string, ok: boolean): boolean {207  const pending = pendingSourceSasConfirmation.get(id);208  if (!pending) return false;209  pendingSourceSasConfirmation.delete(id);210  pending.resolve(ok);211  return true;212}213214export function resolveReceiverSasConfirmation(id: string, sas: string, ok: boolean): boolean {215  const pending = pendingReceiverSasConfirmation.get(id);216  if (!pending) return false;217  pendingReceiverSasConfirmation.delete(id);218  pending.resolve(ok && constantTimeEqual(pending.sas, sas));219  return true;220}221222async function runSourceSession(223  socket: PairingSocket,224  expectedToken: string,225  relayUrl: string,226  local: Awaited<ReturnType<typeof getLocalPairingIdentity>>,227): Promise<void> {228  const timeout = setTimeout(() => socket.close(), SOURCE_WINDOW_MS);229  let noise: NoiseNKSession | undefined;230  try {231    const hello = decodeJson<{ type?: unknown; token?: unknown }>(232      await socket.receive(),233    );234    if (hello.type !== "PEACH_HELLO" || typeof hello.token !== "string" ||235        !constantTimeEqual(hello.token, expectedToken)) {236      throw new Error("invalid_invitation");237    }238    socket.send(encodeJson({239      type: "PEACH_HELLO_ACK",240      ephemeralPublicKeyHex: bytesToHex(local.publicKey),241    }));242243    const session = await noiseNKResponder(244      local.privateKey,245      local.publicKey,246      async (bytes) => socket.send(bytes),247      () => socket.receive(),248    );249    noise = session;250    const channel: PairingTransport = {251      async send(plaintext) { socket.send(session.encrypt(plaintext)); },252      async receive() { return session.decrypt(await socket.receive()); },253    };254    const request = await receiveFrame(channel);255    if (!isAdoptRequest(request)) throw new Error("expected_ADOPT_REQUEST");256257    const device = await grantAdoption(channel, request, {258      sourceIdentity: local.identity,259      pairState: {260        rendezvousSecretHex: bytesToHex(261          deriveRendezvousSecret(session.handshakeHash),262        ),263        relayUrl,264      },265      async rootKeyHex() {266        // grantAdoption calls this only after local password approval and the267        // receiver's encrypted ADOPT_CONFIRM(true).268        const value = getRootKeyHex();269        if (!value) throw new Error("vault_locked");270        return value;271      },272      async vaultId() {273        const value = getRootKeyHex();274        if (!value) throw new Error("vault_locked");275        const bytes = hexToBytes(value);276        try {277          return await computeVaultId(bytes);278        } finally {279          bytes.fill(0);280        }281      },282      async license() {283        return (await isProUser()) ? (await getLicenseKey()) ?? undefined : undefined;284      },285      async applyLicense(license) {286        await applyTransferredLicense(license);287      },288      onConsent: (adoptRequest) => requestConsent(289        adoptRequest,290        derivePairingSAS(session.handshakeHash),291        crypto.randomUUID(),292      ),293      upsertPairedDevice: storeAdoptedDevice,294    });295    if (!device) {296      push("ADOPTION_SOURCE_RESULT", {297        status: "error",298        error: "adoption_rejected",299      });300      return;301    }302    // If the receiver advertised inline-snapshot support, send the vault now303    // over the same authenticated channel. Best-effort: any failure leaves the304    // receiver to fall back to the sync pipeline triggered below.305    if (request.snapshot_capable === true) {306      try {307        const adapter = createSyncVaultAdapter();308        const entryManifest = await adapter.buildEntryManifest();309        const entryIds = Object.keys(entryManifest);310        const entries =311          entryIds.length > 0 ? await adapter.getEncryptedEntries(entryIds) : {};312        const tombstones = await adapter.buildTombstoneManifest();313        let duressSlot: string | null = null;314        try {315          duressSlot = await exportDuressSlotForAdoption();316        } catch {317          // Duress omission must not fail the whole snapshot.318        }319        await sendVaultSnapshot(channel, entries, tombstones, duressSlot);320321        const applied = await withTimeout(receiveFrame(channel), 15_000);322        if (isAdoptSnapshotApplied(applied)) {323          console.info(324            `[Peach] snapshot applied by receiver: ${applied.entries_received} entries, ${applied.tombstones_received} tombstones`,325          );326        }327328        if (adapter.buildOutgoingDeviceManifest) {329          const manifest = await adapter.buildOutgoingDeviceManifest();330          if (manifest) {331            await sendFrame(channel, { type: "ADOPT_DEVICE_MANIFEST", manifest });332            await withTimeout(receiveFrame(channel), 5_000).catch(() => undefined);333          }334        }335      } catch (snapshotError) {336        if (337          snapshotError instanceof Error &&338          snapshotError.message === "ADOPT_SNAPSHOT_DURESS_FRAME_TOO_LARGE"339        ) {340          throw snapshotError;341        }342        console.info(343          "[Peach] inline snapshot send failed (receiver will use sync pipeline):",344          snapshotError,345        );346      }347    }348    push("ADOPTION_SOURCE_RESULT", { status: "complete" });349    // The Android receiver starts its relay listener as soon as its source350    // record is durable. Immediate best-effort trigger; alarm-based retries351    // cover MV3 service-worker death (setTimeout does not survive it).352    void triggerSyncIfReachable({ reason: "manual", force: true });353    schedulePostAdoptionSync();354  } catch (error) {355    push("ADOPTION_SOURCE_RESULT", {356      status: "error",357      error: error instanceof Error ? error.message : "adoption_failed",358    });359  } finally {360    clearTimeout(timeout);361    noise?.close();362    socket.close();363    pendingSourceSasConfirmation.clear();364  }365}366367/**368 * Browser receives the vault from the phone. The protocol is the mirror of369 * the source side: phone is the Noise initiator and the source of truth for370 * the SAS gate, browser is the responder that creates the vault locally.371 */372async function runReceiverSession(373  socket: PairingSocket,374  expectedToken: string,375  relayUrl: string,376  password: string,377  invitationEphemeral: { secretKey: Uint8Array; publicKey: Uint8Array },378): Promise<void> {379  const timeout = setTimeout(() => socket.close(), SOURCE_WINDOW_MS);380  // The invitation binds the responder static so the initiator can verify the ACK.381  const ephemeral = invitationEphemeral;382  const ephemeralPrivate = ephemeral.secretKey;383  const ephemeralPublic = ephemeral.publicKey;384  let noise: NoiseNKSession | undefined;385  let createdVault = false;386  let protocolError: string | undefined;387  try {388    const hello = decodeJson<{ type?: unknown; token?: unknown }>(389      await socket.receive(),390    );391    if (hello.type !== "PEACH_HELLO" || typeof hello.token !== "string" ||392        !constantTimeEqual(hello.token, expectedToken)) {393      throw new Error("invalid_invitation");394    }395    socket.send(encodeJson({396      type: "PEACH_HELLO_ACK",397      ephemeralPublicKeyHex: bytesToHex(ephemeralPublic),398    }));399400    const session = await noiseNKResponder(401      ephemeralPrivate,402      ephemeralPublic,403      async (bytes) => socket.send(bytes),404      () => socket.receive(),405    );406    noise = session;407    const channel: PairingTransport = {408      async send(plaintext) { socket.send(session.encrypt(plaintext)); },409      async receive() { return session.decrypt(await socket.receive()); },410    };411412    const deviceName = await getDeviceName();413414    const adoptionResult = await requestAdoption(channel, {415      deviceName,416      generateDeviceId: () => crypto.randomUUID(),417      async confirmSas() {418        const sas = derivePairingSAS(session.handshakeHash);419        const id = crypto.randomUUID();420        return waitForReceiverSasConfirmation(id, sas);421      },422      async createVaultFromRootKey(rootKeyHex) {423        // Direct call, not chrome.runtime.sendMessage — a service worker424        // calling sendMessage does not reach its own listener (returns425        // undefined), and the receiver already lives in the same SW context426        // as the vault module. Round-tripping through the message bus was427        // the root cause of "create_vault_no_response".428        const { vaultId } = await createVaultFromRootKey(password, rootKeyHex);429        createdVault = true;430        return { vaultId };431      },432      async applyLicense(license) {433        // Direct call, not chrome.runtime.sendMessage — same sendMessage-to-self434        // issue as createVaultFromRootKey. SW can't reach its own listener.435        await applyTransferredLicense(license);436      },437      async license() {438        return (await isProUser()) ? (await getLicenseKey()) ?? undefined : undefined;439      },440      async deriveLocalIdentity() {441        // Direct call for the same reason as applyLicense above.442        const masterKeyHex = getRootKeyHex();443        if (!masterKeyHex) throw new Error("identity_unavailable");444        const masterKey = hexToBytes(masterKeyHex);445        try {446          return await buildLocalIdentity(masterKey);447        } finally {448          masterKey.fill(0);449        }450      },451      async rotateLocalIdentity() {452        await rotateDeviceId();453        const masterKeyHex = getRootKeyHex();454        if (!masterKeyHex) throw new Error("identity_unavailable");455        const masterKey = hexToBytes(masterKeyHex);456        try {457          return await buildLocalIdentity(masterKey);458        } finally {459          masterKey.fill(0);460        }461      },462      async upsertPairedDevice(paired) {463        // Direct call for the same reason as applyLicense above.464        await storeAdoptedDevice(paired);465      },466      pairState: {467        rendezvousSecretHex: bytesToHex(deriveRendezvousSecret(session.handshakeHash)),468        relayUrl,469      },470      onError(error) {471        protocolError = error;472      },473    });474475    if (!adoptionResult) {476      if (createdVault) {477        await rollbackAdoptedVault();478        createdVault = false;479      }480      push("ADOPTION_SOURCE_RESULT", {481        status: "error",482        error: protocolError ?? "adoption_rejected",483      });484      return;485    }486    const { device, snapshotCapable } = adoptionResult;487    // The pairing channel is still open and authenticated — try to pull the488    // vault snapshot inline so the popup transitions immediately instead of489    // waiting on a second sync round. Skip the wait entirely when the source490    // did not echo snapshot_capable: true (pre-C source, or explicit opt-out);491    // fall through to the existing sync pipeline below.492    let snapshotApplied = false;493    if (snapshotCapable) try {494      const snapshot = await withTimeout(receiveVaultSnapshot(channel), 30_000);495      const adapter = createSyncVaultAdapter();496      await adapter.applyEntries(snapshot.entries);497      await adapter.applyTombstones(snapshot.tombstones);498      // Duress install is isolated: a failure here must NOT demote an499      // otherwise-successful entry snapshot to the sync fallback.500      if (snapshot.duressSlot) {501        try {502          await installAdoptedDuressSlot(snapshot.duressSlot);503        } catch (duressError) {504          console.info(505            "[Peach] adopted duress slot install failed (non-fatal):",506            duressError,507          );508        }509      }510      await sendFrame(channel, {511        type: "ADOPT_SNAPSHOT_APPLIED",512        entries_received: Object.keys(snapshot.entries).length,513        tombstones_received: Object.keys(snapshot.tombstones).length,514      });515516      // Optional device graph. Non-fatal and isolated so a manifest timeout or517      // unsupported source cannot demote an otherwise-successful entry snapshot.518      try {519        const manifestFrame = await withTimeout(receiveFrame(channel), 5_000);520        if (521          isAdoptDeviceManifestFrame(manifestFrame) &&522          adapter.applyIncomingDeviceManifest &&523          typeof device.longTermPublicKeyHex === "string" &&524          /^[0-9a-f]{64}$/.test(device.longTermPublicKeyHex)525        ) {526          await adapter.applyIncomingDeviceManifest(527            manifestFrame.manifest,528            hexToBytes(device.longTermPublicKeyHex),529          );530          await sendFrame(channel, { type: "ADOPT_DEVICE_MANIFEST_APPLIED" });531        }532      } catch {533        // The graph arrives via incremental sync instead.534      }535536      await markLastSyncedAt(device.deviceId, Date.now());537      snapshotApplied = true;538    } catch (snapshotError) {539      console.info(540        "[Peach] inline snapshot failed, falling back to sync pipeline:",541        snapshotError,542      );543    }544545    // Adoption has committed identity and vault-key material, but entries have546    // not necessarily crossed yet. Persist the exact source row before telling547    // the popup pairing is complete so a popup close/reopen cannot reveal the548    // temporarily empty receiver vault. The popup clears this only after that549    // row records a successful sync.550    await storageSet(INITIAL_SYNC_PENDING_DEVICE_KEY, device.deviceId).catch(551      () => undefined,552    );553    push("ADOPTION_SOURCE_RESULT", { status: "complete" });554    createdVault = false;555556    if (snapshotApplied) {557      // The snapshot populated the vault and marked the source synced, so the558      // pending marker's job is done — clear it instead of making the popup wait.559      await storageRemove(INITIAL_SYNC_PENDING_DEVICE_KEY).catch(() => undefined);560    } else {561      // Fallback: the existing sync pipeline fills the vault. Immediate562      // best-effort trigger plus alarm-based retries that survive SW death.563      void triggerSyncIfReachable({ reason: "manual", force: true });564      schedulePostAdoptionSync();565    }566  } catch (error) {567    if (createdVault) {568      try {569        await rollbackAdoptedVault();570        createdVault = false;571      } catch (rollbackError) {572        console.error("[Peach] rollback failed:", rollbackError);573      }574    }575    console.error("[Peach] receiver session failed:", error);576    push("ADOPTION_SOURCE_RESULT", {577      status: "error",578      error: error instanceof Error ? error.message : "adoption_failed",579    });580  } finally {581    clearTimeout(timeout);582    noise?.close();583    socket.close();584    ephemeralPrivate.fill(0);585    ephemeralPublic.fill(0);586  }587}588589/**590 * A transferred entitlement is committed only when activation succeeds and591 * the stored value can immediately be re-read as Pro. activateLicense returns592 * a normal Free result for invalid input, so callers must not ignore it.593 */594async function applyTransferredLicense(license: string): Promise<void> {595  const activated = await activateLicense(license);596  if (!activated.valid || activated.plan !== "pro" || !(await isProUser())) {597    throw new Error("license_transfer_failed");598  }599}600601/**602 * Push the SAS to the popup, then block until the popup responds via the603 * `SOURCE_SAS_DECISION` message or the timeout fires. Returns false on604 * timeout or cancel so the adoption aborts before any vault state changes.605 *606 * The pending deferred MUST be installed before the push: a popup-side607 * auto-approver (test mocks, future automation) can synchronously resolve608 * the deferred the moment it sees the SAS push, and a missing slot would609 * drop that approval on the floor.610 */611function waitForReceiverSasConfirmation(612  id: string,613  sas: string,614): Promise<boolean> {615  return new Promise<boolean>((resolve) => {616    const timer = setTimeout(() => {617      pendingReceiverSasConfirmation.delete(id);618      resolve(false);619    }, SOURCE_WINDOW_MS);620    pendingReceiverSasConfirmation.set(id, { sas, resolve: (ok) => {621      clearTimeout(timer);622      resolve(ok);623    } });624    push("ADOPTION_SOURCE_SAS", { id, sas, displayOnly: false });625  });626}627628function waitForSourceSasConfirmation(629  id: string,630  request: AdoptRequest,631  sas: string,632): Promise<boolean> {633  return new Promise<boolean>((resolve) => {634    const timer = setTimeout(() => {635      pendingSourceSasConfirmation.delete(id);636      resolve(false);637    }, SOURCE_WINDOW_MS);638    pendingSourceSasConfirmation.set(id, {639      resolve: (ok) => {640        clearTimeout(timer);641        resolve(ok);642      },643    });644    push("ADOPTION_SOURCE_SAS", {645      id,646      sas,647      receiverDeviceName: request.device_name,648    });649  });650}651652/**653 * Opening Add Device in an unlocked extension is the source-side authorization.654 * Announce the SAS for comparison, then let the scanning device's explicit655 * confirmation be the single commit gate. grantAdoption still refuses to send656 * the root key until the receiver returns ADOPT_CONFIRM(true).657 */658function requestConsent(659  request: AdoptRequest,660  sas: string,661  id: string,662): Promise<boolean> {663  return waitForSourceSasConfirmation(id, request, sas);664}665666function clearState(): void {667  activeSocket = null;668  inFlight = false;669  pendingSourceSasConfirmation.clear();670  pendingReceiverSasConfirmation.clear();671}672673function constantTimeEqual(a: string, b: string): boolean {674  if (a.length !== b.length) return false;675  let diff = 0;676  for (let i = 0; i < a.length; i++) diff |= a.charCodeAt(i) ^ b.charCodeAt(i);677  return diff === 0;678}679680function encodeJson(value: unknown): Uint8Array {681  return new TextEncoder().encode(JSON.stringify(value));682}683684function decodeJson<T>(value: Uint8Array): T {685  return JSON.parse(new TextDecoder().decode(value)) as T;686}687688/**689 * PB-26-213: an adopted device's secret bypasses the public registry into690 * the encrypted pair-secret record. The registry row stays secretless; when691 * the vault is somehow locked here the row still lands and the next unlock692 * cannot recover this secret — re-pair is the fail-closed path.693 */694async function storeAdoptedDevice(paired: PairedDevice): Promise<void> {695  const secret = paired.rendezvousSecretHex;696  const pub = { ...paired };697  delete pub.rendezvousSecretHex;698  await upsertPairedDevice(pub);699  if (!isValidPairSecret(secret)) return;700  const masterKeyHex = getRootKeyHex();701  if (!masterKeyHex) return;702  const masterKey = hexToBytes(masterKeyHex);703  try {704    await setPairSecret(paired.deviceId, secret, masterKey);705  } finally {706    masterKey.fill(0);707  }708}709710function hexToBytes(hex: string): Uint8Array {711  const out = new Uint8Array(hex.length / 2);712  for (let i = 0; i < out.length; i++) {713    out[i] = Number.parseInt(hex.slice(i * 2, i * 2 + 2), 16);714  }715  return out;716}