android 防止反编译重签名,C实现代码

#include <string.h>#include <android/log.h>#include <assert.h>#include <stdlib.h>#include "com_example_myapp_JniTest.h" #define LOGI(...)  __android_log_print(ANDROID_LOG_INFO,"com.example.myapp", __VA_ARGS__)const jint apksign = -344438290;JNIEXPORT jstring JNICALL Java_com_example_myapp_JniTest_getKey(JNIEnv *env, jclass j){   return (*env)->NewStringUTF(env, "Hello from JNI !");}jint getSignHashCode(JNIEnv *env) {    //get application context.  jclass activityThread = (*env)->FindClass(env,"android/app/ActivityThread");    jmethodID currentActivityThread = (*env)->GetStaticMethodID(env,activityThread, "currentActivityThread","()Landroid/app/ActivityThread;");    jobject at = (*env)->CallStaticObjectMethod(env,activityThread, currentActivityThread);    jmethodID getApplication = (*env)->GetMethodID(env,activityThread, "getApplication", "()Landroid/app/Application;");    jobject context = (*env)->CallObjectMethod(env,at, getApplication);// // //get Context class  jclass context_clazz = (*env)->GetObjectClass(env,context);// // //getPackageManager method ID  jmethodID methodID_getPackageManager = (*env)->GetMethodID(env,context_clazz, "getPackageManager",                                                            "()Landroid/content/pm/PackageManager;");// //get PackageManager object  jobject packageManager = (*env)->CallObjectMethod(env,context,                                                   methodID_getPackageManager);// //get PackageManager class  jclass pm_clazz = (*env)->GetObjectClass(env,packageManager);// // //getPackageInfo method ID  jmethodID methodID_pm = (*env)->GetMethodID(env,pm_clazz, "getPackageInfo",                                             "(Ljava/lang/String;I)Landroid/content/pm/PackageInfo;");// //getPackageName method ID.  jmethodID methodID_pack = (*env)->GetMethodID(env,context_clazz, "getPackageName",                                               "()Ljava/lang/String;");// // //get package name.  jstring application_package = (jstring) (*env)->CallObjectMethod(env,context, methodID_pack);    const char *str = (*env)->GetStringUTFChars(env,application_package, 0);// // //get PackageInfo object.  jobject packageInfo = (*env)->CallObjectMethod(env,packageManager,                                                methodID_pm, application_package, 64);// //get PackageInfo class.  jclass packageinfo_clazz = (*env)->GetObjectClass(env,packageInfo);    jfieldID fieldID_signatures = (*env)->GetFieldID(env,packageinfo_clazz, "signatures",                                                  "[Landroid/content/pm/Signature;");// //get signatures array.  jobjectArray signature_arr = (jobjectArray) (*env)->GetObjectField(env,packageInfo,                                                                    fieldID_signatures);// //get Signature element 0.  jobject signature = (*env)->GetObjectArrayElement(env,signature_arr, 0);// // //get signature hashcode  jclass signature_clazz = (*env)->GetObjectClass(env,signature);    jmethodID methodID_hashcode = (*env)->GetMethodID(env,signature_clazz, "hashCode", "()I");    jint hashCode = (*env)->CallIntMethod(env,signature, methodID_hashcode);// // //compare hashcode.  if (hashCode != apksign) {        LOGI(" %d != %d\n", hashCode, apksign);        exit(0);    }    else  {        LOGI(" %d == %d\n", hashCode, apksign);    }    return hashCode;}JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) {    JNIEnv *env = NULL;        if ((*vm)->GetEnv(vm,(void **) &env, JNI_VERSION_1_6) != JNI_OK) {// if (vm->GetEnv((void **) &env, JNI_VERSION_1_6) != JNI_OK) {  LOGI("load library error 1");                return JNI_ERR;            }        assert(env != NULL);        getSignHashCode(env);    LOGI(" %d != %d\n", 1000, 100);    return JNI_VERSION_1_6;}
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