public SaslResult doResponse()

in dbus-java/src/main/java/org/freedesktop/dbus/connections/SASL.java [295:355]
59 lines of code
13 McCabe index (conditional complexity)

    public SaslResult doResponse(int _auth, String _uid, String _kernelUid, SASL.Command _c) {
        MessageDigest md = null;
        try {
            md = MessageDigest.getInstance("SHA");
        } catch (NoSuchAlgorithmException nsae) {
            logger.error("", nsae);
            return SaslResult.ERROR;
        }
        switch (_auth) {
            case AUTH_NONE:
                switch (_c.getMechs()) {
                case AUTH_ANON:
                    return SaslResult.OK;
                case AUTH_EXTERNAL:
                    if (0 == col.compare(_uid, _c.getData()) && (null == _kernelUid || 0 == col.compare(_uid, _kernelUid))) {
                        return SaslResult.OK;
                    } else {
                        return SaslResult.REJECT;
                    }
                case AUTH_SHA:
                    String context = COOKIE_CONTEXT;
                    long id = System.currentTimeMillis();
                    byte[] buf = new byte[8];
                    Message.marshallintBig(id, buf, 0, 8);
                    challenge = stupidlyEncode(md.digest(buf));
                    Random r = new Random();
                    r.nextBytes(buf);
                    cookie = stupidlyEncode(md.digest(buf));
                    try {
                        addCookie(context, "" + id, id / 1000, cookie);
                    } catch (IOException ioe) {
                        logger.debug("", ioe);
                    }
    
                    logger.debug("Sending challenge: {} {} {}", context, id, challenge);
    
                    _c.setResponse(stupidlyEncode(context + ' ' + id + ' ' + challenge));
                    return SaslResult.CONTINUE;
                default:
                    return SaslResult.ERROR;
                }
            case AUTH_SHA:
                String[] response = stupidlyDecode(_c.getData()).split(" ");
                if (response.length < 2) {
                    return SaslResult.ERROR;
                }
                String cchal = response[0];
                String hash = response[1];
                String prehash = challenge + ":" + cchal + ":" + cookie;
                byte[] buf = md.digest(prehash.getBytes());
                String posthash = stupidlyEncode(buf);
                logger.debug("Authenticating Hash; data={} remote-hash={} local-hash={}",prehash, hash, posthash);
                if (0 == col.compare(posthash, hash)) {
                    return SaslResult.OK;
                } else {
                    return SaslResult.ERROR;
                }
            default:
                return SaslResult.ERROR;
            }
    }