Binary file encryption

Question

Hi friends, i am tryin to encrypt binary file using secret key. When i decrypt the it seems taht it is damaged.
I write this code :
  Cipher cipher = Cipher.getInstance("DES");
      cipher.init(Cipher.ENCRYPT_MODE, secretKey);
      CipherOutputStream cos = new CipherOutputStream(new FileOutputStream(new
          File(pathOut)), cipher);
      FileInputStream fis = new FileInputStream(new File(pathIn));
      byte[] buffer = new byte[bufferSize];
      while ( (fis.read(buffer, 0, buffer.length)) >= 0) {
        cos.write(buffer, 0, buffer.length);
      cos.flush();
      cos.close();
      fis.close();I dont know what hapened. Can you help me please?

Answer 1

This is the decyption methode :
Cipher cipher = Cipher.getInstance(AES);
      cipher.init(Cipher.DECRYPT_MODE, secretKey);
      CipherInputStream cis = new CipherInputStream(new FileInputStream(new
          File(pathIn)), cipher);
      FileOutputStream fos = new FileOutputStream(new File(pathOut));
      byte[] buffer = new byte[bufferSize];
            while ( (cis.read(buffer, 0, buffer.length)) >= 0) {
        fos.write(buffer, 0, buffer.length);
      fos.flush();
      fos.close();
      cis.close();