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41 lines
1.3 KiB
Markdown
41 lines
1.3 KiB
Markdown
# Authnkey
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A credential provider for Android that enables FIDO2/CTAP2 security keys over NFC.
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## Background
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Android does not support CTAP2 over NFC. The built-in WebAuthn implementation only handles basic U2F-style authentication for NFC keys, which means no PIN verification and no discoverable credentials (passkeys). USB-C keys have better support, but NFC keys are limited to tap-to-authenticate without user verification.
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Authnkey implements the CTAP2 protocol directly, allowing full passkey functionality with NFC security keys like YubiKey or SoloKey.
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Additionally, Android's FIDO2 support depends on Google Play Services. Authnkey works on devices without GApps since it implements the protocol independently.
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## Features
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- Passkey creation and authentication over NFC and USB
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- PIN verification (CTAP2 clientPin)
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- Discoverable credentials
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- Multiple account selection
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- No Google Play Services required
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## Requirements
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- Android 14+ (API 34)
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- A FIDO2-compatible security key
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## Usage
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1. Install the app
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2. Enable Authnkey in Settings → Passwords & accounts → Passwords, passkeys, and data services
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3. When a site or app requests a passkey, select "Security Key" from the credential provider options
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## Building
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```
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./gradlew assembleDebug
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```
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## License
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MIT
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