Android JNI 校验APP本地签名MD5

我就是我 2023-01-22 05:55 4阅读 0赞

1、新建一个**.cpp**文件

#include <jni.h>
    #include <string.h>
    #include <android/log.h>
    
    #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, "DsvUtil", __VA_ARGS__)
    
    const char HexCode[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
    /**
     * RELEASE_SIGN = MD5
     */
    const char *RELEASE_SIGN = "APP签名MD5";
    
    jobject getApplication(JNIEnv *env);
    
    extern "C" JNIEXPORT jboolean JNICALL Java_com_com_ci_DsvUtil_checkValidity(JNIEnv *env, jobject thiz, jboolean is_debug)
    {
        //获取到Context
        jobject context = getApplication(env);
        jclass  activity = env->GetObjectClass(context);
        // 得到 getPackageManager 方法的 ID
        jmethodID methodID_func = env->GetMethodID(activity, "getPackageManager", "()Landroid/content/pm/PackageManager;");
        // 获得PackageManager对象
        jobject packageManager = env->CallObjectMethod(context, methodID_func);
        jclass packageManagerclass = env->GetObjectClass(packageManager);
        //得到 getPackageName 方法的 ID
        jmethodID methodID_pack = env->GetMethodID(activity, "getPackageName", "()Ljava/lang/String;");
        //获取包名
        jstring name_str = (jstring)(env->CallObjectMethod(context, methodID_pack));
        // 得到 getPackageInfo 方法的 ID
        jmethodID methodID_pm = env->GetMethodID(packageManagerclass, "getPackageInfo", "(Ljava/lang/String;I)Landroid/content/pm/PackageInfo;");
        // 获得应用包的信息
        jobject package_info = env->CallObjectMethod(packageManager, methodID_pm, name_str, 64);
        // 获得 PackageInfo 类
        jclass package_infoclass = env->GetObjectClass(package_info);
        // 获得签名数组属性的 ID
        jfieldID fieldID_signatures = env->GetFieldID(package_infoclass, "signatures", "[Landroid/content/pm/Signature;");
        // 得到签名数组，待修改
        jobject signatur = env->GetObjectField(package_info, fieldID_signatures);
        jobjectArray  signatures = (jobjectArray)(signatur);
        // 得到签名
        jobject signature = env->GetObjectArrayElement(signatures, 0);
        // 获得 Signature 类，待修改
        jclass signature_clazz = env->GetObjectClass(signature);
        //---获得签名byte数组
        jmethodID tobyte_methodId = env->GetMethodID(signature_clazz, "toByteArray", "()[B");
        jbyteArray signature_byte = (jbyteArray) env->CallObjectMethod(signature, tobyte_methodId);
        //把byte数组转成流
        jclass byte_array_input_class = env->FindClass("java/io/ByteArrayInputStream");
        jmethodID init_methodId = env->GetMethodID(byte_array_input_class, "<init>", "([B)V");
        jobject byte_array_input = env->NewObject(byte_array_input_class, init_methodId, signature_byte);
        //实例化X.509
        jclass certificate_factory_class = env->FindClass("java/security/cert/CertificateFactory");
        jmethodID certificate_methodId = env->GetStaticMethodID(certificate_factory_class, "getInstance", "(Ljava/lang/String;)Ljava/security/cert/CertificateFactory;");
        jstring x_509_jstring = env->NewStringUTF("X.509");
        jobject cert_factory = env->CallStaticObjectMethod(certificate_factory_class, certificate_methodId, x_509_jstring);
        //certFactory.generateCertificate(byteIn);
        jmethodID certificate_factory_methodId = env->GetMethodID(certificate_factory_class, "generateCertificate", ("(Ljava/io/InputStream;)Ljava/security/cert/Certificate;"));
        jobject x509_cert = env->CallObjectMethod(cert_factory, certificate_factory_methodId, byte_array_input);
    
        jclass x509_cert_class = env->GetObjectClass(x509_cert);
        jmethodID x509_cert_methodId = env->GetMethodID(x509_cert_class, "getEncoded", "()[B");
        jbyteArray cert_byte = (jbyteArray)env->CallObjectMethod(x509_cert, x509_cert_methodId);
    
        //MessageDigest.getInstance("SHA1")
        jclass message_digest_class = env->FindClass("java/security/MessageDigest");
        jmethodID methodId = env->GetStaticMethodID(message_digest_class, "getInstance", "(Ljava/lang/String;)Ljava/security/MessageDigest;");
        //如果取SHA1则输入SHA1
        //jstring sha1_jstring=env->NewStringUTF(env,"SHA1");
        jstring sha1_jstring = env->NewStringUTF("MD5");
        jobject sha1_digest = env->CallStaticObjectMethod(message_digest_class, methodId, sha1_jstring);
        //sha1.digest (certByte)
        methodId = env->GetMethodID(message_digest_class, "digest", "([B)[B");
        jbyteArray sha1_byte = (jbyteArray)env->CallObjectMethod(sha1_digest, methodId, cert_byte);
        //toHexString
        jsize array_size = env->GetArrayLength(sha1_byte);
        jbyte *sha1 = env->GetByteArrayElements(sha1_byte, NULL);
        char hex_sha[array_size * 2 + 1];
        int i;
        for (i = 0; i < array_size; ++i)
        {
            hex_sha[2 * i] = HexCode[((unsigned char)sha1[i]) / 16];
            hex_sha[2 * i + 1] = HexCode[((unsigned char)sha1[i]) % 16];
        }
        hex_sha[array_size * 2] = '\0';
        LOGE("hex_sha: %s\n", hex_sha);
        if(is_debug)
        {
            if(strcmp(hex_sha, DEFAUT_SIGN) == 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        else
        {
            if(strcmp(hex_sha, RELEASE_SIGN) == 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
    
    jobject getApplication(JNIEnv *env)
    {
        jclass localClass = env->FindClass("android/app/ActivityThread");
        if (localClass != NULL)
        {
            // LOGI("class have find");
            jmethodID getapplication = env->GetStaticMethodID(localClass, "currentApplication", "()Landroid/app/Application;");
            if (getapplication != NULL)
            {
                jobject application = env->CallStaticObjectMethod(localClass, getapplication);
                return application;
            }
            return NULL;
        }
        return NULL;
    }