Files
Shade/packages/shade-recovery
Sterister 8746571d2a release(v4.6.1): bind globalThis.fetch in browser-receiver-sensitive call sites
Browsers' Window.fetch is a WebIDL bound operation; storing it as
this.fetchImpl / this.fetchFn and calling via the instance receiver
threw "Illegal invocation" on the first request. Bind once at
construction in InboxClient, LongPollBridge, and SseBridge. Reported
by Prism (multi-device E2EE terminal), blocking every browser
consumer of the v4.6 transport stack on inbox.start() / bridge.connect().

WsBridge unaffected (uses WebSocket). Node/Bun fetch tolerates a free
receiver, so the bug never surfaced server-side — added regression
tests that install a strict-receiver globalThis.fetch to catch the
issue without an actual browser harness.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-07 23:00:58 +02:00
..

@shade/recovery

Social key recovery for Shade — V3.10.

Shamir Secret Sharing over GF(2^8) splits the user's identity backup key into n shares; any threshold-many k together reconstruct the identity onto a new device. Distribution and reconstruction ride existing 1:1 Shade sessions — no centralized recovery agent.

Install

bun add @shade/recovery

Quick wire-up

import {
  setupRecovery,
  attachGuardian,
  requestRecovery,
  MemoryRecoveryStore,
} from '@shade/recovery';

// Primary (Alice's existing device)
await setupRecovery({
  shade,
  guardians: ['bob', 'carol', 'dan', 'eve', 'faythe'],
  threshold: 3,
  deliver: async (to, envelope) => myOutbox.send(to, envelope),
});

// Each guardian
attachGuardian({
  shade,
  store: new MemoryRecoveryStore(),    // swap for persistent store in prod
  approve: async (ctx) => askUser(ctx),
  deliver: async (to, envelope) => myOutbox.send(to, envelope),
});

// New device (Alice on a fresh phone)
await requestRecovery({
  shade: tempShade,
  originalAddress: 'alice',
  setupId: '<from recovery card>',
  threshold: 3,
  guardians: ['bob', 'carol', 'dan', 'eve', 'faythe'],
  deliver: async (to, envelope) => myOutbox.send(to, envelope),
});

See docs/recovery.md for the full threat model, persistence recommendations, and guardian-UX guidance.

Tests

bun test                    # all
bun test tests/shamir       # Shamir primitives
bun test tests/integration  # 3-of-5 end-to-end
bun test tests/adversarial  # k-1 collusion + forged shares + OOB-gate