crossmint_device_signer 0.2.0

Native device-signer plugin for the Crossmint Flutter SDK — hardware-backed key generation and signing via Secure Enclave (iOS) and Android Keystore.

crossmint_device_signer

Native device-signer plugin used by the Crossmint Flutter SDK.

Most app developers should install crossmint_flutter rather than depending on this plugin directly.

What It Does

• checks whether the device signer is available
• generates a signing key
• maps a wallet address to a key
• looks up mapped or pending keys
• signs messages
• deletes active or pending keys
• exposes a device name when available

API Surface

The plugin exposes these methods through CrossmintDeviceSigner:

• isAvailable()
• generateKey({String? address})
• getKey(String address)
• hasKey(String publicKeyBase64)
• mapAddressToKey(String address, String publicKeyBase64)
• signMessage({required String address, required String message})
• deleteKey(String address)
• deletePendingKey(String publicKeyBase64)
• getDeviceName()

Validation

The plugin has dedicated unit tests and an integration example under example/integration_test/plugin_integration_test.dart that exercises the key lifecycle on-device.

Notes

• The plugin is intended for iOS and Android.
• The generated public key is expected to be an uncompressed P-256 key encoded in base64.
• The Flutter SDK treats this plugin as an implementation detail of the device signer storage abstraction.