Wrap the Base64 class to prevent a runtime exception for bad input

app/src/main/java/me/impy/aegis/db/DatabaseFile.java

@@ -1,7 +1,5 @@
 package me.impy.aegis.db;
 
-import android.util.Base64;
-
 import org.json.JSONException;
 import org.json.JSONObject;
 
@@ -13,6 +11,8 @@ import me.impy.aegis.crypto.MasterKey;
 import me.impy.aegis.crypto.MasterKeyException;
 import me.impy.aegis.db.slots.SlotCollection;
 import me.impy.aegis.db.slots.SlotCollectionException;
+import me.impy.aegis.encoding.Base64;
+import me.impy.aegis.encoding.Base64Exception;
 import me.impy.aegis.encoding.Hex;
 import me.impy.aegis.encoding.HexException;
 
@@ -95,10 +95,10 @@ public class DatabaseFile {
 
     public JSONObject getContent(MasterKey key) throws DatabaseFileException {
         try {
-            byte[] bytes = Base64.decode((String) _content, Base64.NO_WRAP);
+            byte[] bytes = Base64.decode((String) _content);
             CryptResult result = key.decrypt(bytes, _cryptParameters);
             return new JSONObject(new String(result.Data, "UTF-8"));
-        } catch (MasterKeyException | JSONException | UnsupportedEncodingException e) {
+        } catch (MasterKeyException | JSONException | UnsupportedEncodingException | Base64Exception e) {
             throw new DatabaseFileException(e);
         }
     }
@@ -114,7 +114,7 @@ public class DatabaseFile {
             byte[] dbBytes = string.getBytes("UTF-8");
 
             CryptResult result = key.encrypt(dbBytes);
-            _content = new String(Base64.encode(result.Data, Base64.NO_WRAP), "UTF-8");
+            _content = Base64.encode(result.Data);
             _cryptParameters = result.Parameters;
         } catch (MasterKeyException | UnsupportedEncodingException | JSONException e) {
             throw new DatabaseFileException(e);

app/src/main/java/me/impy/aegis/encoding/Base64.java

@@ -0,0 +1,29 @@
+package me.impy.aegis.encoding;
+
+import java.io.UnsupportedEncodingException;
+
+public class Base64 {
+    private static final int _flags = android.util.Base64.NO_WRAP;
+
+    private Base64() {
+
+    }
+
+    public static byte[] decode(String s) throws Base64Exception {
+        try {
+            return android.util.Base64.decode(s, _flags);
+        } catch (IllegalArgumentException e) {
+            throw new Base64Exception(e);
+        }
+    }
+
+    public static String encode(byte[] data) {
+        byte[] encoded = android.util.Base64.encode(data, _flags);
+
+        try {
+            return new String(encoded, "UTF-8");
+        } catch (UnsupportedEncodingException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

app/src/main/java/me/impy/aegis/encoding/Base64Exception.java

@@ -0,0 +1,7 @@
+package me.impy.aegis.encoding;
+
+public class Base64Exception extends Exception {
+    public Base64Exception(Throwable cause) {
+        super(cause);
+    }
+}