Use the signature mechanism for program self-check-Android anti-cracking and self-check android

Use the signature mechanism for program self-check-Android anti-cracking and self-check android

Self-check program 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 Java in cpp to call the c interface

#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, 64);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

The hashCode in HelloWorld is the result of our self-check. When the program is running, check whether the hashCode is consistent with the signature.