24wtxqBH

1// encryption and decriptin  files 
2  file = new File(
3                Environment.getExternalStorageDirectory() + "/" + "encrypt image/" + "img_encrypt.bin");
4        findById();
5
6    }
7
8    private String getUrlString() {
9        return getIntent().getStringExtra("imageUrl");
10    }
11
12    private void findById() {
13
14        image = findViewById(R.id.image_view);
15
16        String url = file.getAbsolutePath();
17
18        byte[] byte_key = LoadData("key.enc");
19        SecretKey key = new SecretKeySpec(byte_key, "AES");
20
21
22        // read file from assets
23//        byte[] content = LoadData("img_encrypt.bin");
24
25        // read file from sdcard
26        byte[] content = OpenFileDialog(url);
27
28
29        byte[] decrypted = decryptFile(key, content);
30
31        image.setImageBitmap(ByteArrayToBitmap(decrypted));
32    }
33
34
35    public byte[] LoadData(String inFile) {
36        String tContents = "";
37
38        try {
39            InputStream stream = getAssets().open(inFile);
40
41            int size = stream.available();
42            buffer = new byte[size];
43            stream.read(buffer);
44            stream.close();
45            tContents = new String(buffer);
46        } catch (IOException e) {
47            // Handle exceptions here
48        }
49
50        return buffer;
51
52    }
53
54
55    public Bitmap ByteArrayToBitmap(byte[] byteArray) {
56        ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(byteArray);
57        Bitmap bitmap = BitmapFactory.decodeStream(arrayInputStream);
58        return bitmap;
59    }
60
61
62    public byte[] OpenFileDialog(String file) {
63
64        FileInputStream fis;
65        String content = "";
66        try {
67
68            fis = new FileInputStream(new File(file));
69            input = new byte[fis.available()];
70            while (fis.read(input) != -1) {
71            }
72            content += new String(input);
73            fis.close();
74        } catch (FileNotFoundException e) {
75            e.printStackTrace();
76        } catch (IOException e) {
77            e.printStackTrace();
78        }
79        return input;
80    }
81
82// encryption class
83
84public class ImageEncoderDecoder {
85
86
87//    is = context.getAssets().open("key.enc");
88
89
90    public static byte[] getFile(String file_location) {
91        File f = new File(file_location);
92        InputStream is = null;
93        try {
94            is = new FileInputStream(f);
95        } catch (FileNotFoundException e2) {
96            e2.printStackTrace();
97        }
98        byte[] content = null;
99        try {
100            content = new byte[is.available()];
101        } catch (IOException e1) {
102            e1.printStackTrace();
103        }
104        try {
105            is.read(content);
106        } catch (IOException e) {
107            e.printStackTrace();
108        }
109
110        return content;
111    }
112
113    public static byte[] encryptFile(Key key, byte[] content) {
114        Cipher cipher;
115        byte[] encrypted = null;
116        try {
117            cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
118            cipher.init(Cipher.ENCRYPT_MODE, key);
119            encrypted = cipher.doFinal(content);
120        } catch (Exception e) {
121            e.printStackTrace();
122        }
123        return encrypted;
124
125    }
126
127    public static byte[] decryptFile(Key key, byte[] textCryp) {
128        Cipher cipher;
129        byte[] decrypted = null;
130        try {
131            cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
132            cipher.init(Cipher.DECRYPT_MODE, key);
133            decrypted = cipher.doFinal(textCryp);
134        } catch (Exception e) {
135            e.printStackTrace();
136        }
137
138        return decrypted;
139    }
140
141    public static void saveFile(byte[] bytes, String location) throws IOException {
142        FileOutputStream fos = new FileOutputStream(location);
143        fos.write(bytes);
144        fos.close();
145    }
146}