Binary File Generator

SteamChunkedFileEncryptionTest.java

    public byte[] generateFile(File file, long size) throws IOException, NoSuchAlgorithmException {
        Random random = new Random();
        byte[] data = new byte[1024];
        if (!file.exists()) {
            file.createNewFile();
        }

        try (FileOutputStream outStream = new FileOutputStream(file)) {

            for (int j = 0; j < size / 1024; j++) {
                random.nextBytes(data);

                outStream.write(data);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return getMd5(file);
    }

    private byte[] getMd5(File file) throws NoSuchAlgorithmException, IOException {
        InputStream fis =  new FileInputStream(file);

        byte[] buffer = new byte[1024];
        MessageDigest complete = MessageDigest.getInstance("MD5");
        int numRead;

        do {
            numRead = fis.read(buffer);
            if (numRead > 0) {
                complete.update(buffer, 0, numRead);
            }
        } while (numRead != -1);

        fis.close();
        return complete.digest();
    }