Question

当我第一次注册且仅生成指纹并生成KeyPair时，PrivateKey在我第二次使用时失效。这只发生一次。我是唯一有此问题的人吗？我的代码有问题吗？

我无法使用任何其他密钥，因为我正在使用PrivateKey来签署数据。

步骤：

擦除所有指纹
注册一个指纹
生成KeyPair并使用FingerprintManager :: authenticate
在下次使用FingerprintManager :: authenticate PrivateKey期间，永久失效。这只是第一次发生

在我生成KeyPair

KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
keystore.load(null);
KeyPairGenerator generator = KeyPairGenerator.getInstance(KeyProperties.KEY_ALGORITHM_EC, "AndroidKeyStore");
generator.initialize(new KeyGenParameterSpec.Builder("key_name", KeyProperties.PURPOSE_SIGN)
    .setDigests(digest) // I have defined digest before
    .setSignaturePaddings(paddings) // I have defined paddings before
    .setUserAuthenticationRequired(true)
    .build());
generator.generateKeyPair();

以下是我为数据签名调用指纹身份验证的代码：

KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
keyStore.load(null);
Signature signature = Signature.getInstance("signing_algorithm");
PrivateKey privateKey = (PrivateKey) keyStore.getKey("key_name", null);
signature.initSign(privateKey); // Here I get KeyPermanentlyInvalidatedException
CryptoObject crypto = new CryptoObject(signature);
FingerprintManager fingerprintManager = context.getSystemService(FingerprintManager.class);
CancellationSignal cancellationSignal = new CancellationSignal();
AuthenticationCallback authenticationCallback = new AuthenticationCallback() {
    ...
};
fingerprintManager.authenticate(crypto, cancelationSignal, 0, authenticationCallback, null);

Answer 1

我试试这个link并且工作得很好。

首先，您需要将Minimum sdk设置为Picture

Mainfest中的第二组权限

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

第三

generateKey（）函数，它生成一个加密密钥，然后安全地存储在设备上。

cipherInit（）函数，用于初始化将用于创建加密FingerprintManager的密码。
     在启动在onCreate（）方法中实现的身份验证过程之前，
CryptoObject实例和各种其他检查。

<强> 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);
       }
   }
}

<强> 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));
       }
   }
}

希望有所帮助。

Answer 2

你可以在github上看到这个：希望它能帮助你：Confirm Credentials

Android指纹API和私钥/公钥

2 个答案: