Android Fingerprint API и закрытые/открытые ключи

я пробую эту ссылку и отлично работаю.

Сначала вам нужно установить минимальный размер SDK, как на картинке.

Второй набор разрешений в Mainfest

   <uses-permission android:name="android.permission.USE_FINGERPRINT" />

В третьих

generateKey(), которая генерирует ключ шифрования, который затем надежно сохраняется на устройстве.

cipherInit(), которая инициализирует шифр, который будет использоваться для создания зашифрованного FingerprintManager.

Экземпляр CryptoObject и различные другие проверки перед запуском процесса аутентификации, реализованного внутри метода onCreate().

FingerPrintActivty.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.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;
 
 
   @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);
       }
   }
}

FingerprintAuthenticationHandler.Class

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.fingerprint.FingerprintManager;
import android.os.CancellationSignal;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.widget.TextView;
 
 
/**
* Created by whit3hawks on 11/16/16.
*/
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));
       }
   }
}

Надеюсь, это поможет.

вы можете увидеть это на github: надеюсь, это поможет вам: Подтвердить учетные данные