dex2jar
react-native-mmkv
dex2jar | react-native-mmkv | |
---|---|---|
5 | 47 | |
11,875 | 5,175 | |
- | - | |
5.0 | 7.8 | |
23 days ago | 9 days ago | |
Java | C++ | |
Apache License 2.0 | GNU General Public License v3.0 or later |
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dex2jar
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Understanding security in React Native applications
App tampering and repackaging can be performed by using reverse engineering or tampering tools, such as Apktool, dex2jar, etc.
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What Happens When Your Phone Is Spying on You
A week ago I purchased a bluetooth device that takes some measurements. You require an Android or iOS application. The first thing the iOS app did was request permission for your location. Immediate fired up MITMproxy [1] running in transparent `--mode wireguard` and installed it's certificate in the iOS trust store. It was sending a whole bunch of data to China and HK. Since I don't have a jailbroken iPhone, it's off to Android.
For BLE scanning, Android does require permissions for location, but this application is using a Chinese branded tracking SDK and sending encrypted (within already encrypted TLS). So it's time to start reversing and instrumenting the runtime.
Well - not so easy, they used a commercial packer that encrypts their compiled bytecode and decrypts and runs it within a C++ library. I managed to bull the Dalvik out of memory using Frida[2], covert it to java bytecode with dex2jar[3] then into decompiled java with jadx [3].
Since the developer relied on the packer to hide/obfuscate their software, it's quite easy to follow. The libraries that do the location tracking on the otherhand are obfuscated so now I'm at the stage of identifying where to hook before the encrypted blobs are sent to servers in China.
I've sunk about 8 hours into this so far. The message here is that to understand what some applications on your phone does you need to really invest time and effort. The developers increase the cost to the consumer to know what their application is doing by obfuscation, encryption and packing. It's asymmetric.
[1] https://mitmproxy.org/posts/wireguard-mode/
[2] https://frida.re/docs/android/
[3] https://github.com/skylot/jadx
[3] https://github.com/pxb1988/dex2jar
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Reverse Engineering Tools in 2022
I think they forgot to google translate the disadvantages of JEB Decompiler
I haven't used JEB to comment, but I've gotten a lot of mileage out of https://github.com/pxb1988/dex2jar#readme and then feed the normal Java jars it produces into https://github.com/mstrobel/procyon#readme and (of course) one shouldn't overlook picking your favorite tool for dealing with AndroidManifest.xml which often has fun things hiding in it
While digging up those links, I was reminded that some folks enjoy https://github.com/Konloch/bytecode-viewer#is-there-a-demo because it can be easier to "try out" a few of the decompilation engines, but I don't use it because it's hard to do batch things with it, versus dex2jar into procyon is automation friendly
- The Code the FBI Used to Wiretap the World
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Decompilers for android
Take a look at apktool: https://ibotpeaches.github.io/Apktool/ and dex2jar: https://github.com/pxb1988/dex2jar
react-native-mmkv
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Understanding security in React Native applications
react-native-mmkv is a wrapper around MMKV that allows you to easily implement secure storage in your app. It is arguably the fastest key-value storage for React Native apps
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Key/value store with expo
Why do you need to access the db from the file system? Can you just use something like https://github.com/mrousavy/react-native-mmkv ?
- React native for Linux app development in 2023
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React Native is Multi Threaded
By using libraries like Reanimated, React Native MMKV, and React Native Skia, you leverage the native thread. However, I know there are developers building amazing things who think outside the box. I'm always thrilled when I read engineering blogs from companies like Netflix, Meta, and Shopify. They create solutions beyond the limits.
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Legend-State 1.0: The fastest React state library
mmkv is not really designed to be used for “heavy” writes, or often changing values. But more as e.g. NSUserDefaults. The storage keeps growing over time which may cause memory issues if used wrongly. Here’s a related github issue: https://github.com/mrousavy/react-native-mmkv/issues/440
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Open Source Stream/SendBird Alternative?
Persistence - React Native MMKV (supports encryption natively and easily integrates with TanStack Query via persistQueryClient)
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Best way to store data to device?
if you need to store something small and simple use whatever. if is complex and speed is important use something performant. realmDB, https://github.com/mrousavy/react-native-mmkv and others are good fit for the job.
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what are some good options for offline databases?
Screw you all, I'll use MMKV as my Local DB: please do not, as explained here.
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react native async storage is not getting accessed correctly pls help me
Try react native mmkv https://github.com/mrousavy/react-native-mmkv
- Best solution for typing suggestions with a huge array?
What are some alternatives?
Apktool - A tool for reverse engineering Android apk files
async-storage - An asynchronous, persistent, key-value storage system for React Native.
comm - Comm is the working name of this open source messaging project.
zustand - 🐻 Bear necessities for state management in React
vineflower - Modern Java decompiler aiming to be as accurate as possible, with an emphasis on output quality. Fork of the Fernflower decompiler.
react-native-debugger - The standalone app based on official debugger of React Native, and includes React Inspector / Redux DevTools
ricochet - Anonymous peer-to-peer instant messaging
react-query - 🤖 Powerful asynchronous state management, server-state utilities and data fetching for TS/JS, React, Solid, Svelte and Vue. [Moved to: https://github.com/TanStack/query]
Recaf - The modern Java bytecode editor
flipper - A desktop debugging platform for mobile developers.
procyon - Procyon java decompiler - Procyon is a binary star system in Canis Minor
react-native-mmkv-storage - An ultra fast (0.0002s read/write), small & encrypted mobile key-value storage framework for React Native written in C++ using JSI