防止别人反编译自已的游戏再修改然后发布,我们可以用在so文件中用Keystore签名值来加密一些参数。
这里只提供NDK获取Keystore签名值代码
CSDN里有这文章,我收藏老提示我网络错误,就给转过来了。
原地址:http://blog.csdn.net/chenfeng0104/article/details/21641427
- package com.boyaa.ndk;
- import android.content.Context;
- public class RegionGames {
- static {
- try {
- System.loadLibrary("boyaaregiongames");
- } catch (Throwable e) {
- e.printStackTrace();
- }
- }
- public static native String getSign(Context ctx);
- }
package com.boyaa.ndk;
import android.content.Context;
public class RegionGames {
static {
try {
System.loadLibrary("boyaaregiongames");
} catch (Throwable e) {
e.printStackTrace();
}
}
public static native String getSign(Context ctx);
}
- #include <jni.h>
- #include<android/log.h>
- #include <string.h>
- #include <unistd.h>
- extern "C"
- JNIEXPORT jstring JNICALL Java_com_boyaa_ndk_RegionGames_signData(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, "toCharsString", "()Ljava/lang/String;");
- env->DeleteLocalRef(signature_class);
- jstring signature_string = (jstring) env->CallObjectMethod(signature_object, methodId);
- return signature_string;
- }