Fix crash happens due to Pro Guard (#641)

* fix: crash because of cipher

* fix: gitignore

app/.gitignore

@@ -1 +1,2 @@
-/build
+/build
+/production

app/proguard-rules.pro

@@ -18,4 +18,15 @@
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
-#-renamesourcefileattribute SourceFile
+#-renamesourcefileattribute SourceFile
+
+-keepnames class * extends javax.crypto.SecretKey
+-keepclassmembers class * extends javax.crypto.SecretKey {
+    <fields>;
+}
+
+-keep class java.security.SecureRandom {
+    public void setSeed(byte[]);
+}
+
+-keep class net.sqlcipher.** {*;}