qT6JFR3F

1@RequiresApi(api = Build.VERSION_CODES.O)
2public void Encriptar_Archivo() throws Exception {
3
4    //File archivo = new File(Ruta);
5   //Path direccion = Paths.get(("/storage/emulated/0/pelicula.mp4"));
6       File file = new File("/storage/emulated/0/pelicula.mp4");
7       InputStream is = new BufferedInputStream(new FileInputStream(file));
8       ByteArrayOutputStream buffer = new ByteArrayOutputStream();
9
10       int nRead;
11       byte[] data = new byte[1999368];
12
13       while ((nRead = is.read(data, 0, data.length)) != -1) {
14           buffer.write(data, 0, nRead);
15       }
16
17       buffer.flush();
18
19       byte[] prueba = buffer.toByteArray();
20       byte encriptado[];
21       encriptado = Cifrar (prueba);
22
23       decrypt (encriptado); //desencriptas el archivo
24
25
26   System.out.println(encriptado);
27
28
29}
30
31
32
33
34
35 public static byte []  Cifrar(byte[] prueba) throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
36
37
38
39    final MessageDigest md = MessageDigest.getInstance("md5");
40    final byte[] digestOfPassword = md.digest("OOAA2011".getBytes("utf-8"));
41    final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
42    for (int j = 0, k = 16; j < 8;) {
43        keyBytes[k++] = keyBytes[j++];
44    }
45    final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
46    final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
47    final Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS7Padding");
48    cipher.init(Cipher.ENCRYPT_MODE, key);
49    byte[] result= cipher.doFinal(prueba);
50
51    return result;
52
53}
54@RequiresApi(api = Build.VERSION_CODES.O)
55public static byte[] decrypt(byte[] message) throws Exception {
56    final MessageDigest md = MessageDigest.getInstance("md5");
57    final byte[] digestOfPassword = md.digest("OOAA2011".getBytes("utf-8"));
58    final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
59    for (int j = 0, k = 16; j < 8;) {
60        keyBytes[k++] = keyBytes[j++];
61    }
62    final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
63    final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
64    final Cipher decipher = Cipher.getInstance("DESede/ECB/PKCS7Padding");
65    decipher.init(Cipher.DECRYPT_MODE, key);
66
67    final byte[] plainText = decipher.doFinal(message);
68
69
70    //Path path = Paths.get("/storage/emulated/0/Ejemplo.docx");
71    // Files.write(path, plainText);
72    Files.write(new File("/storage/emulated/0/Ejemplo2.mp4").toPath(), plainText);
73
74    return plainText;
75}