Encrypt with DES

viren-nadkarni · May 26, 2017 · 48010fd · 48010fd
1 parent 7462564
commit 48010fd
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Showing 4 changed files with 40 additions and 2 deletions.
diff --git a/app/build.gradle b/app/build.gradle
@@ -7,7 +7,7 @@ android {
         applicationId "com.appknox.mfva"
         minSdkVersion 19
         targetSdkVersion 25
-        versionCode 4
+        versionCode 5
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }

diff --git a/app/src/main/java/com/appknox/mfva/MainActivity.java b/app/src/main/java/com/appknox/mfva/MainActivity.java
@@ -14,8 +14,19 @@
 import android.view.View;
 import android.widget.Button;
 
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.SecretKeySpec;
 
 
 public class MainActivity extends AppCompatActivity {
@@ -114,7 +125,27 @@ public void onClick(View v) {
                     byte[] hash = md.digest(quote.getBytes());
                     Snackbar.make(v, "MD5:" + hash.toString() + ": " + quote, Snackbar.LENGTH_SHORT).show();
                 } catch (NoSuchAlgorithmException e) {
-                    //pass
+                    Snackbar.make(v, e.toString(), Snackbar.LENGTH_SHORT).show();
+                }
+            }
+        });
+
+        Button buttonEncrypt = (Button) findViewById(R.id.button_encrypt);
+        buttonEncrypt.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                try {
+                    String quote = "Even if you're not doing anything wrong, you are being watched and recorded. - Edward Snowden";
+
+                    SecretKey keyspec = new SecretKeySpec("Gangnam!".getBytes(), "DES");
+                    Cipher c = Cipher.getInstance("DES/ECB/ZeroBytePadding", "BC");
+                    c.init(Cipher.ENCRYPT_MODE, keyspec);
+                    c.doFinal(quote.getBytes());
+
+                    Snackbar.make(v, quote, Snackbar.LENGTH_SHORT).show();
+                } catch (NoSuchAlgorithmException | NoSuchProviderException | NoSuchPaddingException | BadPaddingException |
+                        IllegalBlockSizeException | InvalidKeyException e) {
+                    Snackbar.make(v, e.toString(), Snackbar.LENGTH_SHORT).show();
                 }
             }
         });

diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
@@ -45,4 +45,10 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="@string/button_calculate_checksum"/>
+
+    <Button
+        android:id="@+id/button_encrypt"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/button_encrypt"/>
 </LinearLayout>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
@@ -15,6 +15,7 @@
     <string name="button_api_requests">API requests</string>
     <string name="button_start_api_requests">Start API requests</string>
     <string name="button_calculate_checksum">Calculate checksum with MD5</string>
+    <string name="button_encrypt">Encrypt with DES/ECB</string>
 
     <string name="permission_custom">Custom Permission</string>
 </resources>