public SaslResult doChallenge()

in dbus-java/src/main/java/org/freedesktop/dbus/connections/SASL.java [249:293]
43 lines of code
7 McCabe index (conditional complexity)

    public SaslResult doChallenge(int _auth, SASL.Command c) throws IOException {
        switch (_auth) {
        case AUTH_SHA:
            String[] reply = stupidlyDecode(c.getData()).split(" ");
            logger.trace(Arrays.toString(reply));
            if (3 != reply.length) {
                logger.debug("Reply is not length 3");
                return SaslResult.ERROR;
            }
            String context = reply[0];
            String id = reply[1];
            String serverchallenge = reply[2];
            MessageDigest md = null;
            try {
                md = MessageDigest.getInstance("SHA");
            } catch (NoSuchAlgorithmException nsae) {
                logger.debug("", nsae);
                return SaslResult.ERROR;
            }
            byte[] buf = new byte[8];
            Message.marshallintBig(System.currentTimeMillis(), buf, 0, 8);
            String clientchallenge = stupidlyEncode(md.digest(buf));
            md.reset();
            long start = System.currentTimeMillis();
            String lCookie = null;
            while (null == lCookie && (System.currentTimeMillis() - start) < LOCK_TIMEOUT) {
                lCookie = findCookie(context, id);
            }
            if (null == lCookie) {
                logger.debug("Did not find a cookie in context {}  with ID {}",context, id);
                return SaslResult.ERROR;
            }
            String response = serverchallenge + ":" + clientchallenge + ":" + lCookie;
            buf = md.digest(response.getBytes());

            logger.trace("Response: {} hash: {}", response, Hexdump.format(buf));

            response = stupidlyEncode(buf);
            c.setResponse(stupidlyEncode(clientchallenge + " " + response));
            return SaslResult.OK;
        default:
            logger.debug("Not DBUS_COOKIE_SHA1 authtype.");
            return SaslResult.ERROR;
        }
    }