Passkeys KMP

Passkeys KMP gives you a single, fully typed Kotlin Multiplatform API for WebAuthn passkeys. You write one create / authenticate call site in commonMain, and each platform runs its own real native authenticator — Face ID, Touch ID, Windows Hello, fingerprint, or a roaming security key.

val passkeys = rememberPasskeyClient()   // resolves the platform client + its UI anchor
 
when (val result = passkeys.create(registrationOptionsJson)) {   // or .authenticate(...)
    is PasskeyResult.Success -> sendToBackend(result.value.rawJson) // verify on your server
    is PasskeyResult.Failure -> handle(result.error.code, result.error.message)
}

Why Passkeys KMP

• One API, real native authenticators. No web-view shims — the device’s own platform authenticator runs on every target.
• Result-first, no exceptions for control flow. Every ceremony returns a PasskeyResult you exhaustively when over.
• Typed errors. Failures carry a stable code and message, so you handle cancellation, timeouts, and unsupported platforms explicitly.
• Compose Multiplatform aware. rememberPasskeyClient() wires up the right client and its UI anchor for you.
• Server-truth by design. The SDK runs only the device ceremony; trust is established when your backend verifies rawJson.

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