VTCh6g3H

1package com.example.admin.fingerprintapp;
2
3import android.Manifest;
4import android.app.KeyguardManager;
5import android.content.pm.PackageManager;
6import android.hardware.fingerprint.FingerprintManager;
7import android.security.keystore.KeyGenParameterSpec;
8import android.security.keystore.KeyProperties;
9import android.support.v4.app.ActivityCompat;
10import android.support.v7.app.AppCompatActivity;
11import android.os.Bundle;
12import android.widget.Toast;
13
14import java.io.IOException;
15import java.security.InvalidAlgorithmParameterException;
16import java.security.InvalidKeyException;
17import java.security.KeyStore;
18import java.security.KeyStoreException;
19import java.security.NoSuchAlgorithmException;
20import java.security.NoSuchProviderException;
21import java.security.UnrecoverableKeyException;
22import java.security.cert.CertificateException;
23
24import javax.crypto.Cipher;
25import javax.crypto.KeyGenerator;
26import javax.crypto.NoSuchPaddingException;
27import javax.crypto.SecretKey;
28
29public class MainActivity extends AppCompatActivity
30{
31
32    private static final String KEY_NAME = "example_key";
33    private FingerprintManager fingerprintManager;
34    private KeyguardManager keyguardManager;
35    private KeyStore keyStore;
36    private KeyGenerator keyGenerator;
37    private Cipher cipher;
38    private FingerprintManager.CryptoObject cryptoObject;
39
40    @Override
41    protected void onCreate(Bundle savedInstanceState)
42    {
43        super.onCreate(savedInstanceState);
44        setContentView(R.layout.activity_main);
45        keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
46        fingerprintManager = (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);
47
48        if (!keyguardManager.isKeyguardSecure())
49        {
50            Toast.makeText(this, "Lock screen security not enabled in Settings ", Toast.LENGTH_LONG).show();
51            return;
52        }
53
54        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED)
55        {
56            Toast.makeText(this, "Fingerprint permission not enabled ", Toast.LENGTH_LONG).show();
57            return;
58        }
59
60
61        if (!fingerprintManager.hasEnrolledFingerprints())
62        {
63
64            Toast.makeText(this, "Register at least on fingerprint in Settings", Toast.LENGTH_LONG).show();
65            return;
66        }
67
68        GenerateKey();
69        if (ciperInit())
70        {
71            cryptoObject = new FingerprintManager.CryptoObject(cipher);
72            FingerPrintHandler fingerPrintHandler = new FingerPrintHandler(this);
73            fingerPrintHandler.StartAuthentication(fingerprintManager, cryptoObject);
74        }
75    }
76
77    protected void GenerateKey()
78    {
79        try
80        {
81            keyStore = KeyStore.getInstance("AndroidKeyStore");
82        }
83        catch (KeyStoreException e)
84        {
85            e.printStackTrace();
86        }
87
88        try
89        {
90            keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
91        }
92        catch (NoSuchAlgorithmException e)
93        {
94            e.printStackTrace();
95        }
96        catch (NoSuchProviderException e)
97        {
98            e.printStackTrace();
99        }
100
101        try
102        {
103            keyStore.load(null);
104            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());
105            keyGenerator.generateKey();
106        }
107        catch (CertificateException e)
108        {
109            e.printStackTrace();
110        }
111        catch (IOException e)
112        {
113            e.printStackTrace();
114        }
115        catch (NoSuchAlgorithmException e)
116        {
117            e.printStackTrace();
118        }
119        catch (InvalidAlgorithmParameterException e)
120        {
121            e.printStackTrace();
122        }
123
124    }
125
126    public boolean ciperInit()
127    {
128        try
129        {
130            cipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/" + KeyProperties.BLOCK_MODE_CBC + "/" + KeyProperties.ENCRYPTION_PADDING_PKCS7);
131
132        }
133        catch (NoSuchAlgorithmException e)
134        {
135            e.printStackTrace();
136            return false;
137        }
138        catch (NoSuchPaddingException e)
139        {
140            e.printStackTrace();
141            return false;
142        }
143
144        try
145        {
146            keyStore.load(null);
147            SecretKey key=(SecretKey)keyStore.getKey(KEY_NAME,null);
148            cipher.init(Cipher.ENCRYPT_MODE,key);
149            return  true;
150        }
151        catch (CertificateException e)
152        {
153            e.printStackTrace();
154            return false;
155        }
156        catch (IOException e)
157        {
158            e.printStackTrace();
159            return false;
160        }
161        catch (NoSuchAlgorithmException e)
162        {
163            e.printStackTrace();
164            return false;
165        }
166        catch (KeyStoreException e)
167        {
168            e.printStackTrace();
169            return false;
170        }
171        catch (UnrecoverableKeyException e)
172        {
173            e.printStackTrace();
174            return false;
175        }
176        catch (InvalidKeyException e)
177        {
178            e.printStackTrace();
179            return false;
180
181        }
182
183    }
184}