Java tutorial
/* * Copyright (C) 2015-2016 Willi Ye <williye97@gmail.com> * * This file is part of Kernel Adiutor. * * Kernel Adiutor is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Kernel Adiutor is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Kernel Adiutor. If not, see <http://www.gnu.org/licenses/>. * */ package com.grarak.kerneladiutor.activities; import android.app.KeyguardManager; import android.os.Build; import android.os.Bundle; import android.security.keystore.KeyGenParameterSpec; import android.security.keystore.KeyProperties; import android.support.annotation.Nullable; import android.support.v4.hardware.fingerprint.FingerprintManagerCompat; import android.support.v7.view.ContextThemeWrapper; import android.support.v7.widget.AppCompatEditText; import android.text.Editable; import android.text.TextWatcher; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import com.grarak.kerneladiutor.R; import com.grarak.kerneladiutor.utils.FingerprintUiHelper; import com.grarak.kerneladiutor.utils.Prefs; import com.grarak.kerneladiutor.utils.Utils; import com.mattprecious.swirl.SwirlView; 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.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; /** * Created by willi on 27.07.16. */ public class SecurityActivity extends BaseActivity { public static final String PASSWORD_INTENT = "password"; private static final String KEY_NAME = "fp_key"; private static final String SECRET_MESSAGE = "secret_message"; private View mPasswordWrong; private FingerprintManagerCompat mFingerprintManagerCompat; private Cipher mCipher; private FingerprintUiHelper mFingerprintUiHelper; private FingerprintManagerCompat.CryptoObject mCryptoObject; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_security); final String password = Utils.decodeString(getIntent().getStringExtra(PASSWORD_INTENT)); AppCompatEditText editText = (AppCompatEditText) findViewById(R.id.edittext); mPasswordWrong = findViewById(R.id.password_wrong); editText.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void afterTextChanged(Editable editable) { if (editable.toString().equals(password)) { mPasswordWrong.setVisibility(View.GONE); setResult(1); finish(); } else { mPasswordWrong.setVisibility(editable.toString().isEmpty() ? View.GONE : View.VISIBLE); } } }); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && Prefs.getBoolean("fingerprint", false, this)) { mFingerprintManagerCompat = FingerprintManagerCompat.from(this); if (mFingerprintManagerCompat.isHardwareDetected() && mFingerprintManagerCompat.hasEnrolledFingerprints() && getSystemService(KeyguardManager.class).isDeviceSecure()) { loadFingerprint(); } } } private void loadFingerprint() { try { KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore"); KeyGenerator keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore"); mCipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/" + KeyProperties.BLOCK_MODE_CBC + "/" + KeyProperties.ENCRYPTION_PADDING_PKCS7); 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(); SecretKey key = (SecretKey) keyStore.getKey(KEY_NAME, null); mCipher.init(Cipher.ENCRYPT_MODE, key); } catch (KeyStoreException | NoSuchProviderException | NoSuchAlgorithmException | NoSuchPaddingException | UnrecoverableKeyException | InvalidKeyException | CertificateException | InvalidAlgorithmParameterException | IOException e) { return; } mCryptoObject = new FingerprintManagerCompat.CryptoObject(mCipher); FrameLayout fingerprintParent = (FrameLayout) findViewById(R.id.fingerprint_parent); final SwirlView swirlView = new SwirlView(new ContextThemeWrapper(this, R.style.Swirl)); swirlView.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); fingerprintParent.addView(swirlView); fingerprintParent.setVisibility(View.VISIBLE); mFingerprintUiHelper = new FingerprintUiHelper.FingerprintUiHelperBuilder(mFingerprintManagerCompat) .build(swirlView, new FingerprintUiHelper.Callback() { @Override public void onAuthenticated() { try { mCipher.doFinal(SECRET_MESSAGE.getBytes()); mPasswordWrong.setVisibility(View.GONE); setResult(1); finish(); } catch (IllegalBlockSizeException | BadPaddingException e) { e.printStackTrace(); swirlView.setState(SwirlView.State.ERROR); } } @Override public void onError() { } }); mFingerprintUiHelper.startListening(mCryptoObject); } @Override public void onResume() { super.onResume(); if (mFingerprintUiHelper != null) { mFingerprintUiHelper.startListening(mCryptoObject); } } @Override public void onPause() { super.onPause(); if (mFingerprintUiHelper != null) { mFingerprintUiHelper.stopListening(); } } }