SpnegoToken spnegoToken = null;
        try {
            spnegoToken = switch (token[0]) {
            case (byte) 0x60 -> new NegTokenInit(token);
            case (byte) 0xa1 -> new NegTokenTarg(token);
            default -> throw new SpnegoException("Invalid token type");
            };
            return spnegoToken;
        } catch (final IOException e) {
            throw new SpnegoException("Invalid token");
        }

import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;

import jcifs.util.Hexdump;

/**
 * SPNEGO initial token
 */
public class NegTokenInit extends SpnegoToken {

    /**
     * Context flag for delegation capability
     */
    public static final int DELEGATION = 0x80;
    /**
     * Context flag for mutual authentication requirement
     */