Android通过NDK获取Keystore签名值 .

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

优快云里有这文章，我收藏老提示我网络错误，就给转过来了。

原地址：http://blog.youkuaiyun.com/chenfeng0104/article/details/21641427

[java] view plain copy print ?

1. package com.boyaa.ndk;  
2.   
3. import android.content.Context;  
4.   
5. public class RegionGames {  
6.     static {  
7.         try {  
8.             System.loadLibrary("boyaaregiongames");  
9.         } catch (Throwable e) {  
10.             e.printStackTrace();  
11.         }  
12.     }  
13.   
14.     public static native String getSign(Context ctx);  
15. }  

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);
}

 

[cpp] view plain copy print ?

1. #include <jni.h>   
2. #include<android/log.h>   
3. #include <string.h>   
4. #include <unistd.h>   
5.   
6. extern "C"  
7. JNIEXPORT jstring JNICALL Java_com_boyaa_ndk_RegionGames_signData(JNIEnv *env, jclass jcl,  
8.         jobject context_object) {  
9.     jclass context_class = env->GetObjectClass(context_object);  
10.   
11.         //context.getPackageManager()   
12.         jmethodID methodId = env->GetMethodID(context_class, "getPackageManager", "()Landroid/content/pm/PackageManager;");  
13.         jobject package_manager_object = env->CallObjectMethod(context_object, methodId);  
14.         if (package_manager_object == NULL) {  
15.             __android_log_print(ANDROID_LOG_INFO, "JNITag","getPackageManager() Failed!");  
16.             return NULL;  
17.         }  
18.   
19.         //context.getPackageName()   
20.         methodId = env->GetMethodID(context_class, "getPackageName", "()Ljava/lang/String;");  
21.         jstring package_name_string = (jstring)env->CallObjectMethod(context_object, methodId);  
22.         if (package_name_string == NULL) {  
23.             __android_log_print(ANDROID_LOG_INFO, "JNITag","getPackageName() Failed!");  
24.             return NULL;  
25.         }  
26.   
27.         env->DeleteLocalRef(context_class);  
28.   
29.         //PackageManager.getPackageInfo(Sting, int)   
30.         jclass pack_manager_class = env->GetObjectClass(package_manager_object);  
31.         methodId = env->GetMethodID(pack_manager_class, "getPackageInfo", "(Ljava/lang/String;I)Landroid/content/pm/PackageInfo;");  
32.         env->DeleteLocalRef(pack_manager_class);  
33.         jobject package_info_object = env->CallObjectMethod(package_manager_object, methodId, package_name_string, 64);  
34.         if (package_info_object == NULL) {  
35.             __android_log_print(ANDROID_LOG_INFO, "JNITag","getPackageInfo() Failed!");  
36.             return NULL;  
37.         }  
38.   
39.         env->DeleteLocalRef(package_manager_object);  
40.   
41.         //PackageInfo.signatures[0]   
42.         jclass package_info_class = env->GetObjectClass(package_info_object);  
43.         jfieldID fieldId = env->GetFieldID(package_info_class, "signatures", "[Landroid/content/pm/Signature;");  
44.         env->DeleteLocalRef(package_info_class);  
45.         jobjectArray signature_object_array = (jobjectArray)env->GetObjectField(package_info_object, fieldId);  
46.         if (signature_object_array == NULL) {  
47.             __android_log_print(ANDROID_LOG_INFO, "JNITag","PackageInfo.signatures[] is null");  
48.             return NULL;  
49.         }  
50.         jobject signature_object = env->GetObjectArrayElement(signature_object_array, 0);  
51.   
52.         env->DeleteLocalRef(package_info_object);  
53.   
54.         //Signature.toCharsString()   
55.         jclass signature_class = env->GetObjectClass(signature_object);  
56.         methodId = env->GetMethodID(signature_class, "toCharsString", "()Ljava/lang/String;");  
57.         env->DeleteLocalRef(signature_class);  
58.         jstring signature_string = (jstring) env->CallObjectMethod(signature_object, methodId);  
59.   
60.         return signature_string;  
61. }