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harshav167
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authentication

Automate iOS authentication with Sign in with Apple, passkeys, OAuth, and biometric re-auth.

Updated Jun 5, 2026
Search Tags:#authentication#oauth#ios#passkeys#biometrics#keychain#sign-in-with-apple
One-click install
npx skills add https://github.com/harshav167/build-ios-apps --skill authentication-harshav167
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: authentication
Source: https://github.com/harshav167/build-ios-apps/tree/main/skills/authentication
Command: npx skills add https://github.com/harshav167/build-ios-apps --skill authentication-harshav167

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Helps teams implement secure, standards-based iOS authentication flows across Sign in with Apple, passkeys, OAuth, and biometric re-authentication for user-friendly sign-in experiences.

Core Features & Use Cases

  • Sign in with Apple integration including credential state checks and revocation handling.
  • Platform and server-backed passkey registration and sign-in with server-side validation.
  • OAuth via ASWebAuthenticationSession and Password AutoFill support for returning users, plus biometric re-auth for sensitive actions.

Quick Start

Implement the authentication flows by integrating AuthenticationServices and LocalAuthentication, wiring server-side validation for identity tokens and authorization codes, storing tokens securely in Keychain, and enabling Associated Domains for passkeys.

Frequently Asked Questions about authentication

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I implement Sign in with Apple including credential state checks and revocation handling?▼

Implement Sign in with Apple by integrating AuthenticationServices to handle Apple ID credentials, checking credential state, managing revocation, and validating identity tokens and authorization codes server-side for secure iOS onboarding.

How do I set up passkeys and Password AutoFill for an iOS app?▼

Set up passkeys and Password AutoFill by enabling Associated Domains, integrating AuthenticationServices for platform passkey registration, and performing server-side validation while storing credentials safely in Keychain for returning users.

What is the best way to handle OAuth sign-in via ASWebAuthenticationSession in iOS?▼

Handle OAuth sign-in via ASWebAuthenticationSession by integrating AuthenticationServices to manage web-based authentication flows, ensuring proper token validation and safe Keychain storage for web-based authorization credentials.

How do I use LAContext for biometric re-authentication during sensitive in-app actions?▼

Use LAContext from LocalAuthentication to perform biometric re-authentication for sensitive in-app actions, verifying user presence after initial sign-in to add a security layer without repeating the full authentication flow.

Do I need Associated Domains enabled to support platform passkeys on iOS?▼

Yes, Associated Domains must be enabled to support platform passkeys on iOS, linking your app to your web domain so AuthenticationServices can securely register and sign in users with server-backed passkey credentials.

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