content_fingerprint.xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_fingerprint" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/colorPrimary" tools:context="nc.example.com.security.FingerprintActivity">
<LinearLayout android:layout_width="match_parent" android:id="@+id/headerLayout" android:orientation="vertical" android:gravity="center" android:layout_marginTop="100dp" android:layout_height="wrap_content">
<ImageView android:layout_width="70dp" android:layout_height="70dp" android:src="@drawable/ic_action_fingerprint" android:id="@+id/icon" android:paddingTop="2dp" android:layout_marginBottom="30dp"/>
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@color/textPrimary" android:textSize="24sp" android:text="@string/title_fingerprint" android:layout_marginLeft="5dp" android:layout_marginRight="5dp" android:layout_marginTop="20dp" android:layout_marginBottom="10dp"/>
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="@color/textPrimary" android:textSize="16sp" android:textAlignment="center" android:gravity="center" android:id="@+id/desc" android:text="@string/desc_fingerprint" android:layout_margin="16dp" android:paddingEnd="30dp" android:paddingStart="30dp"/>
<TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="@color/errorText" android:textSize="14sp" android:textAlignment="center" android:id="@+id/errorText" android:paddingEnd="30dp" android:paddingStart="30dp" android:layout_marginTop="30dp" android:gravity="center"/>
</LinearLayout>
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@color/textPrimaryDark" android:textSize="14sp" android:text="@string/note" android:layout_marginLeft="16dp" android:textAlignment="center" android:layout_marginRight="16dp" android:layout_marginBottom="26dp" android:layout_alignParentBottom="true"/>
</RelativeLayout>
activity_home.xml
<?xml version="1.0" encoding="utf-8"?><android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" tools:context="nc.example.com.security.HomeActivity">
<android.support.design.widget.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_home" />
</android.support.design.widget.CoordinatorLayout>
content_home.xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/content_home" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:context="nc.example.com.security.HomeActivity" tools:showIn="@layout/activity_home">
<TextView android:layout_width="match_parent" android:text="@string/activity_home_desc" android:layout_centerVertical="true" android:textSize="24sp" android:textAlignment="center" android:textColor="@color/colorPrimary" android:layout_height="wrap_content" />
<TextView android:layout_width="match_parent" android:text="@string/activity_home_note" android:layout_alignParentBottom="true" android:textSize="14sp" android:textAlignment="center" android:textColor="@color/colorPrimary" android:layout_height="wrap_content" android:layout_marginBottom="24dp"/>
</RelativeLayout>
FingerprintActivity.java
import android.Manifest;
import android.annotation.TargetApi;
import android.app.KeyguardManager;
import android.content.pm.PackageManager;
import android.hardware.fingerprint.FingerprintManager;
import android.os.Build;
import android.security.keystore.KeyGenParameterSpec;
import android.security.keystore.KeyPermanentlyInvalidatedException;
import android.security.keystore.KeyProperties;
import android.support.annotation.RequiresApi;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
public class FingerprintActivity extends AppCompatActivity {
private KeyStore keyStore;
// Variable used for storing the key in the Android Keystore container private static final String KEY_NAME = "androidHive";
private Cipher cipher;
private TextView textView;
@RequiresApi(api = Build.VERSION_CODES.M)
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fingerprint);
// Initializing both Android Keyguard Manager and Fingerprint Manager KeyguardManager keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
FingerprintManager fingerprintManager = (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);
textView = (TextView) findViewById(R.id.errorText);
// Check whether the device has a Fingerprint sensor. if(!fingerprintManager.isHardwareDetected()){
/** * An error message will be displayed if the device does not contain the fingerprint hardware. * However if you plan to implement a default authentication method, * you can redirect the user to a default authentication activity from here. * Example: * Intent intent = new Intent(this, DefaultAuthenticationActivity.class); * startActivity(intent); */ textView.setText("Your Device does not have a Fingerprint Sensor");
}else {
// Checks whether fingerprint permission is set on manifest if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
textView.setText("Fingerprint authentication permission not enabled");
}else{
// Check whether at least one fingerprint is registered if (!fingerprintManager.hasEnrolledFingerprints()) {
textView.setText("Register at least one fingerprint in Settings");
}else{
// Checks whether lock screen security is enabled or not if (!keyguardManager.isKeyguardSecure()) {
textView.setText("Lock screen security not enabled in Settings");
}else{
generateKey();
if (cipherInit()) {
FingerprintManager.CryptoObject cryptoObject = new FingerprintManager.CryptoObject(cipher);
FingerprintHandler helper = new FingerprintHandler(this);
helper.startAuth(fingerprintManager, cryptoObject);
}
}
}
}
}
}
@TargetApi(Build.VERSION_CODES.M)
protected void generateKey() {
try {
keyStore = KeyStore.getInstance("AndroidKeyStore");
} catch (Exception e) {
e.printStackTrace();
}
KeyGenerator keyGenerator;
try {
keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
} catch (NoSuchAlgorithmException | NoSuchProviderException e) {
throw new RuntimeException("Failed to get KeyGenerator instance", e);
}
try {
keyStore.load(null);
keyGenerator.init(new KeyGenParameterSpec.Builder(KEY_NAME,
KeyProperties.PURPOSE_ENCRYPT |
KeyProperties.PURPOSE_DECRYPT)
.setBlockModes(KeyProperties.BLOCK_MODE_CBC)
.setUserAuthenticationRequired(true)
.setEncryptionPaddings(
KeyProperties.ENCRYPTION_PADDING_PKCS7)
.build());
keyGenerator.generateKey();
} catch (NoSuchAlgorithmException |
InvalidAlgorithmParameterException
| CertificateException | IOException e) {
throw new RuntimeException(e);
}
}
@TargetApi(Build.VERSION_CODES.M)
public boolean cipherInit() {
try {
cipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/" + KeyProperties.BLOCK_MODE_CBC + "/" + KeyProperties.ENCRYPTION_PADDING_PKCS7);
} catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
throw new RuntimeException("Failed to get Cipher", e);
}
try {
keyStore.load(null);
SecretKey key = (SecretKey) keyStore.getKey(KEY_NAME,
null);
cipher.init(Cipher.ENCRYPT_MODE, key);
return true;
} catch (KeyPermanentlyInvalidatedException e) {
return false;
} catch (KeyStoreException | CertificateException | UnrecoverableKeyException | IOException | NoSuchAlgorithmException | InvalidKeyException e) {
throw new RuntimeException("Failed to init Cipher", e);
}
}
}
FingerprintHandler.java
package nc.example.com.security;
/** * Created by nc on 6/28/2017. */import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.fingerprint.FingerprintManager;
import android.os.Build;
import android.os.CancellationSignal;
import android.support.annotation.RequiresApi;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.widget.TextView;
/** * Created by whit3hawks on 11/16/16. */@RequiresApi(api = Build.VERSION_CODES.M)
public class FingerprintHandler extends FingerprintManager.AuthenticationCallback {
private Context context;
// Constructor public FingerprintHandler(Context mContext) {
context = mContext;
}
public void startAuth(FingerprintManager manager, FingerprintManager.CryptoObject cryptoObject) {
CancellationSignal cancellationSignal = new CancellationSignal();
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
return;
}
manager.authenticate(cryptoObject, cancellationSignal, 0, this, null);
}
@Override public void onAuthenticationError(int errMsgId, CharSequence errString) {
this.update("Fingerprint Authentication error\n" + errString, false);
}
@Override public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
this.update("Fingerprint Authentication help\n" + helpString, false);
}
@Override public void onAuthenticationFailed() {
this.update("Fingerprint Authentication failed.", false);
}
@Override public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
this.update("Fingerprint Authentication succeeded.", true);
}
public void update(String e, Boolean success){
TextView textView = (TextView) ((Activity)context).findViewById(R.id.errorText);
textView.setText(e);
if(success){
textView.setTextColor(ContextCompat.getColor(context,R.color.colorPrimaryDark));
}
}
}
HomeActivity.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
public class HomeActivity extends AppCompatActivity {
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="nc.example.com.security">
<uses-permission android:name="android.permission.USE_FINGERPRINT" />
<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme">
<activity android:name=".FingerprintActivity" android:label="fingerprint" android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".HomeActivity" android:label="home" android:theme="@style/AppTheme.NoActionBar"></activity>
</application>
</manifest>
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