aYtBnXqT

1
2    static boolean saveHmac (  byte[] stream, String filekeys, String slectedFile)  {
3        try {
4        KeyGenerator keyGen = null;
5
6            keyGen = KeyGenerator.getInstance("AES");
7
8        keyGen.init(128);
9        SecretKeySpec secretKey = (SecretKeySpec) keyGen.generateKey();
10
11            byte[] hmac = Cipher_Functions.generateHMAC256(stream ,  secretKey);
12            //Grava ficheiro keys.txt
13            FileOutputStream fos = new FileOutputStream(filekeys);
14            Read_and_write.writeHmac(fos, hmac);
15
16
17            ByteArrayOutputStream outputStream = new ByteArrayOutputStream( );
18            outputStream.write( hmac );
19            outputStream.write( stream );
20
21            byte[] cipherText_final  = outputStream.toByteArray( );
22
23            //Grava o ficheiro cifrado
24            fos = new FileOutputStream(slectedFile);
25            Read_and_write.writeciphertext(fos, cipherText_final);
26
27        } catch (NoSuchAlgorithmException | InvalidKeyException e) {
28          return false;
29        } catch (IOException e) {
30            e.printStackTrace();
31        }
32        return true ;
33    }
34
35}