Goldfinger ![]()
Important
This version is compatible with androidx.biometric. If you do not want to use androidx.biometric, feel free to use older version of Goldfinger.
Quick guide
Add mavenCentral
To include Goldfinger in your project, you have to add buildscript dependencies in your project level build.gradle:
buildscript {
repositories {
mavenCentral()
}
}Add dependency
implementation 'co.infinum:goldfinger:2.1.0'Initialize
Goldfinger.Builder(context).build()Check prerequisites
if (goldfinger.canAuthenticate(@AuthenticatorTypes int authenticators)) {
/* Authenticate */
}Build params
PromptParams are directly linked to BiometricPrompt.PromptInfo so be sure to read which parameters are required.
Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
.title("Title")
.negativeButtonText("Cancel")
.description("Description")
.subtitle("Subtitle")
.build();I also suggest looking at ValidateUtils class to understand what is allowed by the Biometric library.
Authenticate
goldfinger.authenticate(params, new Goldfinger.Callback() {
@Override
public void onError(@NonNull Exception e) {
/* Critical error happened */
}
@Override
public void onResult(@NonNull Goldfinger.Result result) {
/* Result received */
}
});You can see all Goldfinger methods here.
Rx module
Goldfinger has separate Rx module in case you want to use reactive approach.
Add dependencies
implementation 'co.infinum:goldfinger:2.1.0'
implementation 'co.infinum:goldfinger-rx:2.1.0'Initialize
RxGoldfinger.Builder(context).build()Authenticate
goldfinger.authenticate(params).subscribe(new DisposableObserver<Goldfinger.Result>() {
@Override
public void onComplete() {
/* Fingerprint authentication is finished */
}
@Override
public void onError(Throwable e) {
/* Critical error happened */
}
@Override
public void onNext(Goldfinger.Result result) {
/* Result received */
}
});You can see all RxGoldfinger methods here.
Configuration
If you don’t like default implementations, you can easily modify them using Goldfinger.Builder object.
Goldfinger.Builder(context)
.logEnabled(true)
.cipherFactory(factory)
.cipherCrypter(crypter)
.build()Important: Both Factory and Crypter should use same object type. If MacFactory is used, be sure to also provide MacCrypter!
Factory (Cipher, Mac, Signature)
Factory class should be used to create Cipher/Mac/Signature which will be used internally when CryptoObject is created.
new CipherFactory() {
@Nullable
@Override
public Cipher createEncryptionCrypter(String key) {
/* Create Cipher for encryption */
}
@Nullable
@Override
public Cipher createDecryptionCrypter(String key) {
/* Create Cipher for decryption */
}
};Goldfinger will default to AesCipherFactory if other implementation is not provided.
Crypter (Cipher, Mac, Signature)
Crypter class should be used to encrypt/decrypt data with Cipher/Mac/Signature which was created with Factory above.
new CipherCrypter() {
@Nullable
@Override
public String encrypt(@NonNull Cipher crypter, @NonNull String value) {
/* Encrypt data with given crypter */
}
@Nullable
@Override
public String decrypt(@NonNull Cipher crypter, @NonNull String value) {
/* Decrypt data with given crypter */
}
};Goldfinger will default to Base64CipherCrypter if other implementation is not provided.
Logging
Logging is off by default. You can enable it by calling Goldfinger.Builder(context).logEnabled(true).
Known issues
- Android Oreo does not throw
KeyPermanentlyInvalidatedException- Link
Contributing
Feedback and code contributions are very much welcome. Just make a pull request with a short description of your changes. By making contributions to this project you give permission for your code to be used under the same license.
License
Copyright 2018 Infinum
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Credits
Maintained and sponsored by Infinum.