Checksum compare

ArchiveContactsParser.java

    private static Boolean checkClonedFilesChecksum(String source, String result) throws IOException, NoSuchAlgorithmException {
        String sourceChecksum = getChecksum(source);
        String resultChecksum = getChecksum(result);
        System.out.println("Source checksum: " + sourceChecksum);
        System.out.println("Result checksum: " + resultChecksum);
        return sourceChecksum.equals(resultChecksum);
    }

    private static String getChecksum(String fileName) throws IOException, NoSuchAlgorithmException {
        MessageDigest msg = MessageDigest.getInstance("SHA1");
        FileInputStream fis = new FileInputStream(fileName);
        StringBuffer buffer = new StringBuffer("");


        Integer readBytes;

        byte[] dataBytes = new byte[1024];
        byte[] msgBytes = msg.digest();

        while ((readBytes = fis.read(dataBytes)) != -1) {
            msg.update(dataBytes, 0, readBytes);
        }

        for (int i = 0; i < msgBytes.length; i += 1) {
            buffer.append(Integer.toString((msgBytes[i] & 0xff) + 0x100, 16).substring(1));
        }

        fis.close();

        return buffer.toString();
    }