Android JNI Get app Signature

Use Android JNI to get an app signature.

Generate your own password based on the signature you get, which prevents others from recompiling their source code and looking for a password.

Jstring java_com_masonsdk_jni_jniutil_getpwd (jnienv* env, Jobject thizz,jobject thiz) {Jclass Native_clazz = env->    Getobjectclass (Thiz); Get the ID of the Getpackagemanager method Jmethodid Methodid_func =env->getmethodid (Native_clazz, "Getpackagemanager", "() Landr    Oid/content/pm/packagemanager; ");    Get the App Package Manager jobject Package_manager = Env->callobjectmethod (Thiz, Methodid_func);    Get Packagemanager class Jclass Pm_clazz = Env->getobjectclass (Package_manager); Get the ID of the Getpackageinfo method Jmethodid methodid_pm = Env->getmethodid (Pm_clazz, "Getpackageinfo", "(Ljava    /lang/string;i) landroid/content/pm/packageinfo; ");    Get the package name Jmethodid methodid_packagename =env->getmethodid (Native_clazz, "Getpackagename", "() Ljava/lang/String;");    Jstring name_str = static_cast<jstring> (Env->callobjectmethod (Thiz, methodid_packagename)); Get information about the app package Jobject package_info = Env->callobjectmethod (Package_manager, METHODID_PM, NAME_STR, 64);//Env->newstringutf ("COM.EXAMPLE.CONTASDF")//Get PackageInfo class Jclass Pi_clazz = Env->getobjectclass (package_i    NFO); Gets the ID of the signature array property Jfieldid Fieldid_signatures = Env->getfieldid (Pi_clazz, "signatures", "[Landroid/content    /pm/signature; ");    Get signature Array, pending modification jobject Signatur = Env->getobjectfield (Package_info, fieldid_signatures);    Jobjectarray signatures = reinterpret_cast<jobjectarray> (Signatur);    Get signed Jobject signature = env->getobjectarrayelement (signatures, 0);    Get Signature class, pending modification Jclass S_clazz = Env->getobjectclass (Signature);    Get the ID of the Hashcode method Jmethodid METHODID_HC = Env->getmethodid (S_clazz, "Hashcode", "() I");    Get the application Package Manager, pending modification int hash_code = Env->callintmethod (signature, METHODID_HC);    Char str[100];    sprintf (str, "%u", hash_code); return Env->newstringutf (str);}

Source:

Https://github.com/mentor811/AndroidUltimateEncrypt

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