ets/Fingerprint.java at master · zyfers/ets · GitHub

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package com.example.lenovo.employeetrackingsystem;

import android.Manifest;
import android.app.KeyguardManager;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.fingerprint.FingerprintManager;
import android.security.keystore.KeyGenParameterSpec;
import android.security.keystore.KeyGenParameterSpec.Builder;
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.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

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 Fingerprint extends AppCompatActivity {

    private static final String KEY_NAME = "example_key";
    private FingerprintManager fingerprintManager;
    private KeyguardManager keyguardManager;
    private KeyStore keyStore;
    private KeyGenerator keyGenerator;
    private Cipher cipher;
    private FingerprintManager.CryptoObject cryptoObject;
    private FingerprintHandler fingerprintHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fingerprint);

        keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
        fingerprintManager = (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);

        if (!keyguardManager.isKeyguardSecure()) {

            Toast.makeText(this, "Lock screen security not enabled in Settings",
                    Toast.LENGTH_LONG).show();
            return;
        }

        if (ActivityCompat.checkSelfPermission(this,
                Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(this, "Fingerprint authentication permission not enabled",
                    Toast.LENGTH_LONG).show();
            return;
        }

        if (!fingerprintManager.hasEnrolledFingerprints()) {

            // This happens when no fingerprints are registered.
            Toast.makeText(this, "Register at least one fingerprint in Settings",
                    Toast.LENGTH_LONG).show();
            return;
        }

        generateKey();

        if (cipherInit()) {
            cryptoObject = new FingerprintManager.CryptoObject(cipher);
            FingerprintHandler helper = new FingerprintHandler(this);
            helper.startAuth(fingerprintManager,cryptoObject);
        }

    }

    protected void generateKey() {
        try {
            keyStore = KeyStore.getInstance("AndroidKeyStore");
        } catch (Exception e) {
            e.printStackTrace();
        }
        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);
        }

    }

    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);
        }
    }
}