ida

JNI Helper for IDA

Load JNI function signatures from JSON file and apply to IDA-Pro

Install

copy jni_helper.py to IDA plugin dir.

IDA user plugin directory:

os.path.join(idaapi.get_user_idadir(), "plugins")

General plugin directory:

• macOS: $IDA_HOME/ida.app/Contents/MacOS/plugins
• Windows: %IDA_HOME%\plugins

Load

Edit -> Plugins -> JNI Helper

Or you can just Alt + F7 to run the script.

For IDA Pro 7.4+, use jni_helper3.py instead.

Logging:

[+] plugin init
[+] plugin run
[+] loading signature file: /Users/root/app-debug.json
[+] loaded 14 methods from JSON
[+] apply 0x9f8 JNI_OnLoad
[+] apply 0xa90 JNI_OnUnload
[+] apply 0xabc Java_com_evilpan_demojni_MainActivity_c_1stringFromJNI
[+] apply 0xae4 Java_com_evilpan_demojni_MainActivity_c_1testOverload__
[+] apply 0xb70 Java_com_evilpan_demojni_MainActivity_c_1testOverload__I
[+] apply 0xca8 Java_com_evilpan_demojni_MainActivity_c_1testOverload__JFD
[+] apply 0xdb0 Java_com_evilpan_demojni_MainActivity_c_1testStatic
[+] apply 0xe78 Java_com_evilpan_demojni_MainActivity_c_1testClass
[+] apply 0xf98 Java_com_evilpan_demojni_MainActivity_c_1testArray

Before:

After:

Links

• hex-rays/idapython_docs
• hex-rays/sdkdoc
• hex-rays/ida74_idapython_no_bc695_porting_guide
• IDAPython cheatsheet