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Electron macOS Keychain Rotation SDK
An npm package implementing proof-carrying safeStorage rotation for Electron apps that undergo frequent local rebuilds or ad-hoc signing. The SDK handles successor-item creation, key material migration, and ACL management to eliminate recurring keychain prompts after updates. It targets Electron developers shipping desktop apps on macOS who cannot or do not use stable Apple Developer ID signing.
Why this matters
You ship an Electron desktop app on macOS with auto-updates. Every time your updater rebuilds the app locally, macOS ad-hoc signing produces a new cdhash. Because the keychain ACL partition list is bound to cdhash rather than a stable Team ID, your users get a keychain password prompt on the first launch after every single update. You cannot fix this headlessly — modifying an existing keychain item's ACL requires the user's keychain password, and your updater has no access to the safeStorage key material. You have no Apple Developer ID, or your CI pipeline doesn't use stable signing. Your users are frustrated by repeated permission prompts, and your support tickets spike after every release. You need a library that handles keychain item rotation transparently during the update process.
- · Built for Electron app developers and teams shipping desktop applications on macOS, especially those distributing via auto-updaters with local rebuilds, open-source projects without Apple Developer accounts, and internal tool teams using ad-hoc signing..
- · Most likely monetization: Freemium (open-source core SDK, paid SaaS for CI audit/testing features and priority support).
The Pain · Narrative
You ship an Electron desktop app on macOS with auto-updates. Every time your updater rebuilds the app locally, macOS ad-hoc signing produces a new cdhash. Because the keychain ACL partition list is bound to cdhash rather than a stable Team ID, your users get a keychain password prompt on the first launch after every single update. You cannot fix this headlessly — modifying an existing keychain item's ACL requires the user's keychain password, and your updater has no access to the safeStorage key material. You have no Apple Developer ID, or your CI pipeline doesn't use stable signing. Your users are frustrated by repeated permission prompts, and your support tickets spike after every release. You need a library that handles keychain item rotation transparently during the update process.
Score Breakdown
Market Signal
Go-to-Market
Indie developers and small teams shipping Electron desktop apps on macOS with auto-updaters but without Apple Developer Program membership or stable CI signing
~5,000-15,000 active Electron projects on macOS that use auto-update and may face this issue
Open-source the core SDK on npm/GitHub, promote via Electron community (Discord, GitHub Discussions) and developer content (blog posts explaining the cdhash/ACL mechanism)
Free open-source core SDK; $49/month for CI audit SaaS add-on with automated keychain/TCC regression testing
1,000 weekly npm downloads and 50 GitHub stars within 30 days of launch, indicating organic adoption and problem resonance
MVP Scope · 1–2 weeks
- Create npm package scaffold with TypeScript types for keychain rotation API (rotate, migrate, cleanup, diagnose)
- Implement successor-item creation using SecItemAdd with custom SecAccess (the headless-compatible path confirmed in the discussion)
- Build proof-carrying re-encryption logic: encrypt new blob with proof of origin from previous key material, verify integrity on read
- Write diagnostic CLI that dumps current keychain item ACL partition lists and flags cdhash-bound items at risk of prompt-on-update
- Create minimal Electron demo app with auto-update simulation to reproduce the prompt-on-rebuild issue as the integration testbed
- Implement the full update-time rotation flow: detect cdhash change, create successor item, migrate encrypted secrets, verify, cleanup old item
- Add TCC/Apple Events preservation helper that provides guidance and code snippets for stable signing identity configuration
- Write automated test suite simulating 5 consecutive app updates with cdhash changes, verifying zero keychain prompts after rotation
- Test across macOS 26 and 27 on Apple Silicon (M-series) CI runners to verify cross-version compatibility
- Publish v0.1.0 to npm with documentation site explaining the mechanism, installation, and integration with electron-updater
Differentiation
Why This Might Fail
Self-rebuttal — the most important trust signal
- 1The total addressable market may be too small — most serious Electron apps eventually obtain an Apple Developer ID ($99/year) and use stable signing, which permanently eliminates the issue without needing a third-party SDK.
- 2Electron's maintainers may add native safeStorage rotation support in response to this well-known issue, making a third-party library unnecessary and unable to compete with built-in functionality.
- 3The security risk of a third-party library handling keychain key material and rotation logic may deter adoption — developers may prefer to simply disable keychain encryption (as the project itself did by making it opt-in/default off) rather than add a dependency that touches sensitive credential storage.
Evidence Summary
How AI synthesized this insight — no verbatim quotes
Approximately 6 commenters independently confirmed the keychain ACL cdhash-binding mechanism across multiple macOS versions and hardware generations. Several users dumped partition lists showing cdhash accumulation, captured securityd logs proving the ACL mismatch at prompt time, and tested code requirement approaches. One user discovered the create-vs-modify asymmetry (new items can be created headless with custom ACLs, but existing items cannot be modified without the keychain password), which directly informs the successor-item rotation design. The discussion also revealed that cert-anchored signing fixes TCC but not keychain, and that the only permanent fix is an Apple Developer Team ID — a barrier for many open-source and indie projects.
Action Plan
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Landing Page Copy Kit
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Headline
Electron macOS Keychain Rotation SDK
Sub-headline
An npm package implementing proof-carrying safeStorage rotation for Electron apps that undergo frequent local rebuilds or ad-hoc signing. The SDK handles successor-item creation, key material migration, and ACL management to eliminate recurring keychain prompts after updates. It targets Electron developers shipping desktop apps on macOS who cannot or do not use stable Apple Developer ID signing.
Who It's For
For Electron app developers and teams shipping desktop applications on macOS, especially those distributing via auto-updaters with local rebuilds, open-source projects without Apple Developer accounts, and internal tool teams using ad-hoc signing.
Feature List
✓ Successor-item keychain rotation on app update (create new item with correct ACL, migrate key material, cleanup old item) ✓ Proof-carrying re-encryption: carry forward encrypted blobs with integrity verification across cdhash changes ✓ TCC permission preservation guidance and helper utilities for Apple Events grants across rebuilds ✓ Cross-platform keychain abstraction (macOS keychain, Windows DPAPI, Linux libsecret) with platform-specific rotation strategies ✓ Diagnostic CLI that dumps current keychain ACL state and identifies cdhash-bound items at risk of prompt-on-update
Where to Validate
Share your landing page in r/GitHub · NousResearch/hermes-agent — that's exactly where these pain points were discovered.
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