In this lesson, you will learn how to configure digital identity and security credentials in Unreal Engine to ensure your builds are authorized for execution on mobile and console storefronts.
The Foundation of Trust
Before an OS like iOS or a console environment will execute your compiled binary, it requires cryptographic proof that the code originates from a verified developer. This process relies on two primary components: Certificates and Provisioning Profiles.
- Certificates: These act as your digital ID card. They verify who is signing the code.
- Provisioning Profiles: These act as the "permissions" slip. They define where the code can run (e.g., development devices vs. App Store) and which entitlements your app is allowed to use (e.g., Push Notifications or In-App Purchases).
Configuring in Unreal Engine
While you manage these assets through vendor portals (like the Apple Developer Portal or console-specific partner sites), Unreal Engine provides the bridge to bake these into your project.
Navigate to Project Settings > Platforms > [Target Platform]. For platforms like iOS, you will see a section dedicated to Signing. Here, you provide the Bundle Identifier that matches your profile and point the engine to your .mobileprovision file and the corresponding .p12 certificate.
When you trigger a packaging build, the Unreal Automation Tool (UAT) passes these credentials to the platform-specific toolchain (like codesign on macOS). The engine essentially wraps your executable in a signature block:
; Example of manually defined signing info in DefaultEngine.ini
[/Script/IOSRuntimeSettings.IOSRuntimeSettings]
BundleIdentifier=com.yourstudio.projectname
ProvisioningProfile=My_App_Distribution.mobileprovision
SigningCertificate=iPhone Distribution: Your Studio Name
If these credentials mismatch—such as using a Development profile for a Shipping build—the OS will reject the application launch immediately, often with a "Developer Untrusted" or "Invalid Signature" error. Always ensure your certificates are current; an expired certificate will render your perfectly optimized package non-functional on hardware. By integrating these files directly into your project's Build folder, you ensure that every automated build is signed correctly for distribution.
Key Takeaway: Digital signing is the final gatekeeper; your application cannot execute on restricted platforms without matching valid certificates and provisioning profiles embedded into the build manifest.