/**
 * To filter 0 len updates and for debugging
 */

public class SigningDigest implements SmbConstants {

    static LogStream log = LogStream.getInstance();

    private MessageDigest digest;
    private byte[] macSigningKey;
    private boolean bypass = false;
    private int updates;
    private int signSequence;

    public SigningDigest(byte[] macSigningKey, boolean bypass) throws SmbException {
        try {

#log4j.logger.jcifs.util.transport.Transport: DEBUG
#log4j.logger.jcifs.smb.DfsImpl: DEBUG
#log4j.logger.jcifs.smb: DEBUG
#log4j.logger.jcifs.smb.SmbFileOutputStream: TRACE
#log4j.logger.jcifs.smb.SigningDigest: TRACE

                            } else {
                                byte[] signingKey = auth.getSigningKey(transport.server.encryptionKey);
                                request.digest = new SigningDigest(signingKey, false);
                            }
                        }
    
                        request.auth = auth;
    
                        try {

            log.trace("macSigningKey:");
            log.trace(Hexdump.toHexString(macSigningKey, 0, macSigningKey.length));
        }
    }


    /**
     * This constructor used to instance a SigningDigest object for
     * signing/verifying SMB using kerberos session key.
     * The MAC Key = concat(Session Key, Digest of Challenge);
     * Because of Kerberos Authentication don't have challenge,

    boolean useUnicode, received, extendedSecurity;
    long responseTimeout = 1;
    int signSeq;
    boolean verifyFailed;
    NtlmPasswordAuthentication auth = null;
    String path;
    SigningDigest digest = null;
    ServerMessageBlock response;

    ServerMessageBlock() {
        flags = (byte)( FLAGS_PATH_NAMES_CASELESS | FLAGS_PATH_NAMES_CANONICALIZED );
        pid = PID;
        batchLevel = 0;

    SmbComBlankResponse key = new SmbComBlankResponse();
    long sessionExpiration = System.currentTimeMillis() + SO_TIMEOUT;
    LinkedList referrals = new LinkedList();
    SigningDigest digest = null;
    LinkedList sessions = new LinkedList();
    ServerData server = new ServerData();
    /* Negotiated values */
    int flags2 = FLAGS2;
    int maxMpxCount = MAX_MPX_COUNT;