XopProtector: Open-Source Android APK Hardening Tool with DEX Encryption and VMP

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XopProtector is a free, open-source Android APK protection tool hosted on GitHub under the Apache-2.0 license, developed to give individual developers and small teams an affordable alternative to costly commercial app-hardening platforms. The tool combines a build-time packing engine with a device-side native runtime shell to deliver DEX encryption, dual-mode virtual machine protection (PVM1 and PVM2), native SO library encryption, and RASP-based anti-debugging and anti-injection capabilities. It is available as a Windows desktop GUI application for one-click use, a command-line interface suitable for CI/CD pipelines, or a programmable Java/Kotlin library for direct integration into existing toolchains. The project includes performance optimizations such as parallel file pre-patching and asynchronous SO decryption to minimize the impact of hardening on app cold-start times. Developers are reminded in the project's own disclaimer that no hardening solution guarantees absolute security — it only raises the cost of reverse engineering — and the tool must only be used to protect software the user is legally authorized to distribute.

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