steam shared secret dump script

dump.py

# https://novanoir.moe/blog/2022/11/20/%E3%80%90ROOT%20Android%E3%80%91Steam%203.0%20%E5%AF%BC%E5%87%BA%E4%BB%A4%E7%89%8C%E7%9A%84%E6%95%B0%E7%A7%8D%E6%96%B9%E6%B3%95/
import json
import frida
import sys

package = "com.valvesoftware.android.steam.community"
cmd = """
'use strict;'

if (Java.available) {
  Java.perform(function() {

    //Cipher stuff
    const Cipher = Java.use('javax.crypto.Cipher');

    Cipher.doFinal.overload('[B').implementation = function (input) {
        var result = this.doFinal.overload('[B').call(this, input);
        send(result);
    }

  }
)}
"""


def parse_hook(cmd_):
    print('<li> Parsing hook...')
    script = session.create_script(cmd_)
    script.on('message', on_message)
    script.load()


def on_message(message, _):
    try:
        if message:
            if message['type'] == 'send':
                result = "".join(chr(i) for i in message['payload'])
                print(json.dumps(json.loads(result), indent=2, ensure_ascii=False))
    except Exception as e:
        print(e)


if __name__ == '__main__':
    try:
        print('</li><li> Spawning ' + package)
        pid = frida.get_usb_device().spawn(package)
        session = frida.get_usb_device().attach(pid)
        parse_hook(cmd)
        frida.get_usb_device().resume(pid)
        print('')
        sys.stdin.read()

    except KeyboardInterrupt:
        sys.exit(0)