How to get SHA-1 from File

SHA.java

    // new FileInputStream(file);
    
    public static String getSHA1(InputStream input) throws
            IOException, NoSuchAlgorithmException {

        MessageDigest sha1 = MessageDigest.getInstance("SHA-1");

        byte[] buffer = new byte[8192];
        int len = input.read(buffer);

        while (len != -1) {
            sha1.update(buffer, 0, len);
            len = input.read(buffer);
        }

        return new HexBinaryAdapter().marshal(sha1.digest());

    }