The API fingerprint provides an easy way to integrate fingerprint authentication in Android apps. It supports all the devices that have a built-in fingerprint sensor. This includes most smartphones, tablets, and some laptops. To use the fingerprint API, you need a secret API key. You can get one by visiting the Settings page in the Fingerprint dashboard.
To make an API call, you need to add a HTTP header with the authentication key. If you don’t do this, the call will fail with an error message. If you want to test the fingerprint API, you can also set up a local environment by adding a fake Auth-API-Key in the app’s manifest file.
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When you authenticate a user’s fingerprint, your application needs to verify that it matches the one that they registered on their device. To do this, you create a CryptoObject from the Cipher, initialize it with the cipher’s symmetric key, and then pass this value to the FingerprintManager.AuthenticationCallback#onAuthenticationSucceeded method.
Once the authentication succeeds, you need to save the password somewhere in your application. You can do this using a password helper class that encrypts the password with the cipher, and then saves it.
The fingerprint scanner is a powerful tool that can dramatically improve the security of your application by removing the need for passwords. However, a major obstacle remains for fingerprint recognition to become widespread: Most people don’t have access to a device with a built-in sensor. If this issue can be resolved, the benefits of biometric authentication will be widely available.
