android apk 自我保护技术-完整性校验

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

public class MainActivity extendsActivity {

@Override

protected void onCreate(BundlesavedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    String apkPath = getPackageCodePath();

    Long dexCrc = Long.parseLong(getString(R.string.classesdex_crc));

    try

    {

        ZipFile zipfile = new ZipFile(apkPath);

        ZipEntry dexentry = zipfile.getEntry("classes.dex");

        Log.i("verification","classes.dexcrc="+dexentry.getCrc());

        if(dexentry.getCrc() != dexCrc){

        Log.i("verification","Dexhas been modified!");

        }else{

        Log.i("verification","Dex hasn‘t been modified!");

        }

    } catch (IOException e) {

     // TODO Auto-generated catch block

     e.printStackTrace();

    }

   }

}

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

public class MainActivity extendsActivity {

@Override

protectedvoid onCreate(Bundle savedInstanceState) {

     super.onCreate(savedInstanceState);

     setContentView(R.layout.activity_main);

     String apkPath = getPackageCodePath();

     MessageDigest msgDigest = null;

     try {

        msgDigest = MessageDigest.getInstance("SHA-1");

        byte[] bytes = new byte[1024];

        int byteCount;

        FileInputStream fis = new FileInputStream(new File(apkPath));

        while ((byteCount = fis.read(bytes)) > 0)

        {

            msgDigest.update(bytes, 0, byteCount);

        }

        BigInteger bi = new BigInteger(1, msgDigest.digest());

        String sha = bi.toString(16);

        fis.close();

        //这里添加从服务器中获取哈希值然后进行对比校验

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}