Application of signature mechanism to self-test--android anti-cracking

The self-test program is written in so.

Main code

Import in file header

#if (Cc_target_platform = = cc_platform_android) #include <jni.h> #include <android/log.h> #include < string.h> #include <unistd.h> #endif

Then write to the interface of Java call C in CPP

#if (Cc_target_platform = = cc_platform_android) extern "C" {jniexport jint jnicall java_org_cocos2dx_cpp_appactivity_ checkapk (jnienv *env, Jclass jcl,jobject context_object) {Jclass Context_class = Env->getobjectclass (context_object );//context.getpackagemanager () Jmethodid Methodid = Env->getmethodid (Context_class, "GetPackageManager", "() Landroid/content/pm/packagemanager; "); Jobject package_manager_object = Env->callobjectmethod (Context_object, Methodid); if (Package_manager_object = = NULL) {__android_log_print (Android_log_info, "Jnitag", "Getpackagemanager () failed!"); return NULL;} Context.getpackagename () Methodid = Env->getmethodid (Context_class, "Getpackagename", "() Ljava/lang/String;"); Jstring package_name_string = (jstring) env->callobjectmethod (Context_object, Methodid); if (package_name_string = = NULL) {__android_log_print (Android_log_info, "Jnitag", "Getpackagename () failed!"); return NULL;} Env->deletelocalref (Context_class);//packagemanager.getpackageinfo (Sting, int) Jclass Pack_manager_class = Env->getobjectclass (package_manager_object); methodid = Env->GetMethodID (pack_ Manager_class, "Getpackageinfo", "(ljava/lang/string;i) landroid/content/pm/packageinfo;"); Env->deletelocalref (Pack_manager_class); Jobject package_info_object = Env->callobjectmethod (package_manager _object, Methodid, package_name_string, +); if (package_info_object = = NULL) {__android_log_print (Android_log_info, " Jnitag "," Getpackageinfo () failed! "); return NULL;} Env->deletelocalref (package_manager_object);//packageinfo.signatures[0]jclass Package_info_class = env-> Getobjectclass (package_info_object); Jfieldid FieldID = Env->getfieldid (Package_info_class, "signatures", "[ Landroid/content/pm/signature; "); Env->deletelocalref (Package_info_class); Jobjectarray Signature_object_array = (jobjectarray) env-> Getobjectfield (Package_info_object, FieldID), if (Signature_object_array = = NULL) {__android_log_print (ANDROID_LOG_ INFO, "Jnitag", "packageinfo.signatures[" is null "); return NULL;} Jobject signature_object = env->getobjectarrayelement (signature_object_array, 0); Env->deletelocalref (Package _info_object);//signature.tocharsstring () Jclass signature_class = Env->getobjectclass (Signature_object); Methodid = Env->getmethodid (Signature_class, "Hashcode", "() I"); Env->deletelocalref (signature_class); int signature_string = Env->callintmethod (Signature_object, Methodid); Helloworld::hashcode = Signature_string;return signature_string;}} #endif

HelloWorld in the hashcode is the result of our self-test, the program run time to detect whether hashcode is consistent with the signature

Application of signature mechanism to self-test--android anti-cracking