Essential Books

Verifying App Signature - Tamper Detection

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This technique details how to ensure that your .apk has been signed with your developer certificate, and leverages the fact that the certificate remains consistent and that only you have access to it. We can break this technique into 3 simple steps:

Here’s the code snippet: 

private static final int VALID = 0;
private static final int INVALID = 1;

public static int checkAppSignature(Context context) {

try {
      PackageInfo packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES);

      for (Signature signature : packageInfo.signatures) {

        byte[] signatureBytes = signature.toByteArray();

        MessageDigest md = MessageDigest.getInstance("SHA");

        md.update(signature.toByteArray());

        final String currentSignature = Base64.encodeToString(md.digest(), Base64.DEFAULT);

        Log.d("REMOVE_ME", "Include this string as a value for SIGNATURE:" + currentSignature);

        //compare signatures
        if (SIGNATURE.equals(currentSignature)){
          return VALID;
        };
      }
    } catch (Exception e) {
        //assumes an issue in checking signature., but we let the caller decide on what to do.
    }

    return INVALID;

}
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Security:
* Security
* Verifying App Signature - Tamper Detection
Table Of Contents
0 Getting Started
1 Layouts
2 Gradle
3 RecyclerView onClickListeners
4 NavigationView
5 Intent
6 JSON handling with org.json
7 Android Studio
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61 Multidex and the Dex Method Limit
62 Data Synchronization with Sync Adapter
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73 Integrate Google Sign In
74 In-app billing
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76 ContentProvider
77 Dagger 2
78 Realm
79 Unit testing in Android with JUnit
80 Android Versions
81 Wi-Fi Connections
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83 Localization with resources
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87 Google Awarness APIs
88 Text to Speech (TTS)
89 UI Lifecycle
90 Spinner
91 Data Encryption / Decryption
92 Testing UI with Espresso
93 Writing UI tests
94 GreenRobot EventBus
95 OkHttp
96 Enhancing Performance Using Icon Fonts
97 Handling Depp Links
98 Canvas drawing using SurfaceView
99 Firebase
100 Crash Reporting Tools
101 Check Internet Connectivity
102 Facebook SDK
103 Unzip File
104 Android Places API
105 Creating your own libraries
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107 Device Display Metrics
108 TextView
109 ListView
110 Building Backwards Compatible Apps
111 Loader
112 ProGuard - Obfuscating and Shrinking your code
113 Detect Shake Event
114 Typedef Annotations
115 Capturing Screenshots
116 MVP Architecture
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118 Xposed
119 Security
120 PackageManager
121 ImageView
122 Gesture Detection
123 Doze Mode
124 Android Sound and Media
125 SearchView
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127 Callback URL
128 Twitter APIs
129 SqlCipher integration
130 Drawables
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133 RenderScript
134 Fresco
135 Swipe to Refresh
136 AutoCompleteTextView
137 Installing apps with ADB
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141 Publish to Play Store
142 Firebase Realtime Database
143 Image Compression
144 Email Validation
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148 Bottom Sheets
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150 EditText
151 Paypal Gateway Integration
152 Firebase App Indexing
153 Firebase Crash Reporting
154 Displaying Google Ads
155 Vk SDK
156 Localized DateTime
157 Count Down Timer
158 Reading Barcode and QR codes
159 Otto Event Bus
160 TransitionDrawable
161 Port Mapping using Cling
162 Creating Overlay always-on-top Windows
163 ExoPlayer
164 Inter-app UI testing with UIAutomator
165 MediaSession
166 Speech to Text Conversion
167 FileProvider
168 Publish .aar file to Apache Archive with Gradle
169 XMPP
170 Authenticator
171 RecyclerView and LayoutManagers
172 AudioManager
173 Job Scheduling
174 Accounts and AccountManager
175 OpenCV
176 Split Screen Multi-Screen Activities
177 Threads
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182 MVVM Architecture
183 BottomNavigationView
184 ORMLite
185 YouTube API
186 TabLayout
187 Retrofit2 with RxJava
188 DayNight Theme AppCompat
189 ShortcutManager
190 LruCache
191 Using Jenkins CI
192 Zip files
193 Vector Drawables
194 Fastlane
195 Define step value for RangeSeekBar
196 Getting started with OpenGL ES 2.0
197 Check Data Connection
198 Java Native Interface (JNI)
199 FileIO
200 Perfomance Optimization
201 Robolectric
202 Moshi
203 Strick Mode Policy
204 Internalization and localization
205 Retrolambda
206 SparseArray
207 Firebase Cloud Messaging
208 Shared Element Transitions
209 Android Things
210 VideoView
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212 Dependency Injection with Dagger 2
213 Formatting phone numbers
214 Storing password securely
215 Android Kernel Optimization
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218 ProGuard
219 Create Android Custom ROMs
220 Java on Android
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222 Genymotion for Android
223 Handling touch and motion events
224 Creating Splash screen
225 ConstraintSet
226 CleverTap
227 Publish library to Maven repositories
228 ADB shell
229 Ping ICMP
230 AIDL
231 Using Kotlin
232 Autosizing TextView
233 Signing apps for release
234 Context
235 Activity Recognition
236 Secure SharedPreferences
237 Secure SharedPreferences
238 Bitmap Cache
239 Android x86 in VirtualBox
240 JCodec
241 Design Patterns
242 Okio
243 Google SignIn integration
244 TensorFlow
245 Game developmen
246 Notification Channel
247 Bluetooth Low Energy (LE)
248 Leak Canary
249 FuseView
250 SQLite using ContentValues
251 Enhancing Alert Dialogs
252 Hardware Button Events, Intents PTT
253 SpannableString
254 Looper
255 Optimized VideoView
256 Google Drive API
257 Animated AlertDialog Box
258 Annotation Processor
259 SyncAdapter with periodically do sync of data
260 Singleton Class for Toast Message
261 Fastjson
262 Android Architecture Components
263 Jackson
264 Play Store
265 Loading Bitmaps Effectively
266 Getting system font names
267 Smartcard
268 Convert vietnamese string to english
269 Contributors