• jni中调用java方法获取当前apk的签名文件md5值


    相应的java方法:

    void getsign(Context context) throws Exception {
        PackageInfo localPackageInfo = context.getPackageManager()
                .getPackageInfo(context.getPackageName(), 64);
        StringBuilder localStringBuilder = new StringBuilder();
        Signature[] arrayOfSignature = localPackageInfo.signatures;
        Signature localSignature = arrayOfSignature[0];
    
        MessageDigest localMessageDigest = MessageDigest.getInstance("MD5");
        localMessageDigest.update(localSignature.toByteArray());
        // 这个就是签名的md5值
        String str2 = toHex(localMessageDigest.digest());
    }
    
    private String toHex(byte[] paramArrayOfByte) {
        StringBuffer localStringBuffer = new StringBuffer();
        for (int i = 0; i < paramArrayOfByte.length; i++) {
            Object[] arrayOfObject = new Object[1];
            arrayOfObject[0] = Byte.valueOf(paramArrayOfByte[i]);
            localStringBuffer.append(String.format("%02x", arrayOfObject));
        }
        return localStringBuffer.toString();
    }

    jni中能够调用java的方法,參照上面的java方法能够相应写出jni的c代码:

    // 字节流转换为十六进制字符串
    //http://blog.csdn.net/pingd/article/details/41945417
    void ByteToHexStr(const unsigned char* source, char* dest, int sourceLen)  
    {
        short i;
        unsigned char highByte, lowByte;
    
        for (i = 0; i < sourceLen; i++)
        {
            highByte = source[i] >> 4;
            lowByte = source[i] & 0x0f;
    
            highByte += 0x30;
    
            if (highByte > 0x39)
                    dest[i * 2] = highByte + 0x07;
            else
                    dest[i * 2] = highByte;
    
            lowByte += 0x30;
            if (lowByte > 0x39)
                dest[i * 2 + 1] = lowByte + 0x07;
            else
                dest[i * 2 + 1] = lowByte;
        }
        return;
    }
    
    JNIEXPORT jstring JNICALL Java_com_hengbao_util_DecodeUtil_test(JNIEnv * env, jobject thiz, jobject context) {
        //java code=======================================================
        //      PackageInfo localPackageInfo = context.getPackageManager()
        //              .getPackageInfo(context.getPackageName(), 64);
        //      StringBuilder localStringBuilder = new StringBuilder();
        //      Signature[] arrayOfSignature = localPackageInfo.signatures;
        //      Signature localSignature = arrayOfSignature[0];
        //      MessageDigest localMessageDigest = MessageDigest.getInstance("MD5");
        //      localMessageDigest.update(localSignature.toByteArray());
        //      // 这个就是签名的md5值
        //      String str2 = toHex(localMessageDigest.digest());
        //      localStringBuilder.append("Signature of ")
        //              .append(localPackageInfo.packageName).append('
    ').append(str2);
        //      System.out.println(localStringBuilder.toString());
        //      TextView tv = (TextView) findViewById(R.id.tv);
        //      tv.setText(localStringBuilder.toString());
    
    
        //  private String toHex(byte[] paramArrayOfByte) {
        //      StringBuffer localStringBuffer = new StringBuffer();
        //      for (int i = 0; i < paramArrayOfByte.length; i++) {
        //          Object[] arrayOfObject = new Object[1];
        //          arrayOfObject[0] = Byte.valueOf(paramArrayOfByte[i]);
        //          localStringBuffer.append(String.format("%02x", arrayOfObject));
        //      }
        //      return localStringBuffer.toString();
        //  }
        //java code======================================================
    
        jclass tem_class;
        jmethodID tem_method;
        jclass class_context = (*env)->GetObjectClass(env, context);
        //      PackageInfo localPackageInfo = context.getPackageManager()
        //              .getPackageInfo(context.getPackageName(), 64);
        tem_method = (*env)->GetMethodID(env, class_context, "getPackageManager", "()Landroid/content/pm/PackageManager;");
        jobject obj_package_manager = (*env)->CallObjectMethod(env, context, tem_method);
        // getPackageName
        tem_method = (*env)->GetMethodID(env, class_context, "getPackageName", "()Ljava/lang/String;");
        jobject obj_package_name = (*env)->CallObjectMethod(env, context, tem_method);
        // getPackageInfo
        tem_class = (*env)->GetObjectClass(env, obj_package_manager);
        tem_method = (*env)->GetMethodID(env, tem_class, "getPackageInfo", "(Ljava/lang/String;I)Landroid/content/pm/PackageInfo;");
        jobject obj_package_info = (*env)->CallObjectMethod(env, obj_package_manager, tem_method, obj_package_name, 64);
    
        // Signature[] arrayOfSignature = localPackageInfo.signatures;
        // Signature localSignature = arrayOfSignature[0];
        tem_class = (*env)->GetObjectClass(env, obj_package_info);
        jfieldID fieldID_signatures = (*env)->GetFieldID(env, tem_class, "signatures", "[Landroid/content/pm/Signature;");
        jobjectArray signatures = (*env)->GetObjectField(env, obj_package_info, fieldID_signatures);
        jobject signature = (*env)->GetObjectArrayElement(env, signatures, 0);
        // localSignature.toByteArray()
        tem_class = (*env)->GetObjectClass(env, signature);
        tem_method = (*env)->GetMethodID(env, tem_class, "toByteArray", "()[B");
        jobject obj_sign_byte_array = (*env)->CallObjectMethod(env, signature, tem_method);// 这个就是拿到的签名byte数组
    
        //      MessageDigest localMessageDigest = MessageDigest.getInstance("MD5");
        jclass class_MessageDigest = (*env)->FindClass(env, "java/security/MessageDigest");
        tem_method = (*env)->GetStaticMethodID(env, class_MessageDigest, "getInstance", "(Ljava/lang/String;)Ljava/security/MessageDigest;");
        jobject obj_md5 = (*env)->CallStaticObjectMethod(env, class_MessageDigest, tem_method, (*env)->NewStringUTF(env, "md5"));
        //      localMessageDigest.update(localSignature.toByteArray());
        //tem_class = (*env)->GetObjectClass(env, obj_md5);
        tem_method = (*env)->GetMethodID(env, class_MessageDigest, "update", "([B)V");// 这个函数的返回值是void,写V
        (*env)->CallVoidMethod(env, obj_md5, tem_method, obj_sign_byte_array);
        // localMessageDigest.digest()
        tem_method = (*env)->GetMethodID(env, class_MessageDigest, "digest", "()[B");
        // 这个是md5以后的byte数组,如今仅仅要将它转换成16进制字符串。就能够和之前的比較了
        jobject obj_array_sign = (*env)->CallObjectMethod(env, obj_md5, tem_method);// jni中有强转类型的概念吗
        //      // 这个就是签名的md5值
        //      String str2 = toHex(localMessageDigest.digest());
    
        // 尝试用c写一下:http://blog.csdn.net/pingd/article/details/41945417
        jsize int_array_length = (*env)->GetArrayLength(env, obj_array_sign);
        jbyte* byte_array_elements = (*env)->GetByteArrayElements(env, obj_array_sign, JNI_FALSE);
        char* char_result = (char*) malloc(int_array_length*2+1);// 開始没有+1。在有的情况下会越界产生问题,还是在后面补上比較好
        // 将byte数组转换成16进制字符串,发现这里不用强转。jbyte和unsigned char应该字节数是一样的
        ByteToHexStr(byte_array_elements, char_result, int_array_length);
        *(char_result+int_array_length*2) = '';// 在末尾补
        jstring string_result = (*env)->NewStringUTF(env, char_result);
        // release
        (*env)->ReleaseByteArrayElements(env, obj_array_sign, byte_array_elements, JNI_ABORT);
        // 释放指针使用free
        free(char_result);
        return string_result;
    
        // 假设使用java的16进制转换的话,应该也能够的。用c写16进制转换太麻烦
        //jclass class_HandleData = (*env)->FindClass(env, "com/hengbao/util/HandleData");
        //tem_method = (*env)->GetStaticMethodID(env, class_HandleData, "bytesToHexString1", "([B)Ljava/lang/String;");
        //jobject obj_result = (*env)->CallStaticObjectMethod(env, class_HandleData, tem_method, obj_array_sign);
        //return obj_result;
    }
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  • 原文地址:https://www.cnblogs.com/zhchoutai/p/8428175.html
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