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1Anon BlackHat Board / Mobile App Reverse Engineering & API Deobfuscation / 🔓 Extracting HMAC Request Signing Keys (`X-Signature` / `X-Gorgon`) from Native JNI `.so` Libraries with Ghidra + Unidbg
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Mobile App Reverse Engineering & API Deobfuscation PINNED STICKY VERIFIED METHOD Posted on Oct 03, 2026 at 03:30 PM
2 replies 3,756 views

🔓 Extracting HMAC Request Signing Keys (`X-Signature` / `X-Gorgon`) from Native JNI `.so` Libraries with Ghidra + Unidbg

AP
apk_decompiler OP / ELITE MEMBER
When a mobile API requires a cryptographic header like `X-App-Signature: sha256(timestamp +deviceId + body + secret)` computed inside a C++ JNI library (`libsecurity.so`), you don't even need to decompile the full OLLVM control-flow flattened C++ code in Ghidra! ### The `Unidbg` Emulation Shortcut: Load the `.so` file directly inside **Unidbg** (Java ARM64 CPU emulator) on your Linux server and call the native JNI signing function directly over HTTP at 2,000 signatures/second without running an Android emulator!
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frida_hooker ✓ TOP VERIFIED REPLY
04:15 PM

Unidbg is a superpower. Instead of spending 3 weeks reversing custom white-box AES + OLLVM obfuscation in IDA Pro, you just let Unidbg execute the `.so` binary in 2ms per call!

Make sure to mock the JNI `Settings.Secure.ANDROID_ID` and `PackageManager.GET_SIGNATURES` callbacks inside Unidbg so the `.so` doesn't detect it's running outside the official signed APK.

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