安卓逆向案例分析之蝉妈妈sign破解

    public static String R0(@NonNull String str, String str2) {
        if (TextUtils.isEmpty(str)) {
            return "";
        }
        try {
            String str3 = "";
            for (byte b2 : MessageDigest.getInstance("MD5").digest((str + str2).getBytes())) {
                String hexString = Integer.toHexString(b2 & 255);
                if (hexString.length() == 1) {
                    hexString = MessageService.MSG_DB_READY_REPORT + hexString;
                }
                str3 = str3 + hexString;
            }
            return str3;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return "";
        }
    }

import frida, sys
def on_message(message, data):
    if message['type'] == 'send':
        print("[*] {0}".format(message['payload']))
    else:
        print(message)
jscode_hook = """
    Java.perform(
        function(){
            var class_obj = Java.use("d.j.d.x");
            console.log(class_obj);
            if (class_obj != undefined) {
                class_obj.R0.overload('java.lang.String', 'java.lang.String').implementation = function (s1, s2) {
                    console.log("参数1: ---> "+ s1);
                    console.log("参数2: ---> "+ s2);
                    var res = this.R0(s1, s2);
                    console.log("加密: ---> "+res);
                    return res;
                }
            }
        }

    )
"""
process = frida.get_usb_device().attach('com.chandashi.chanmama')
script = process.create_script(jscode_hook)
script.on('message', on_message)
print('[*] Hook Start Running')
script.load()
sys.stdin.read()