return null;
        }
        synchronized( auth ) {
            auth.url = url;
            auth.sae = sae;
            return auth.getNtlmPasswordAuthentication();
        }
    }
/**
An application extending this class must provide an implementation for this method that returns new user credentials try try when accessing SMB resources described by the <tt>getRequestingURL</tt> and <tt>getRequestingException</tt> methods.

        ASN1TaggedObject derToken;
        try {
            derToken = ASN1Util.as(ASN1TaggedObject.class, stream);
            if ( derToken.getTagClass() != BERTags.APPLICATION )
                throw new PACDecodingException("Malformed kerberos ticket");
            stream.close();
        }
        catch ( IOException e ) {

<p>
The second parameter specifies how the file should be shared. If
<code>SmbFile.FILE_NO_SHARE</code> is specified the client will
have exclusive access to the file. An additional open command
from jCIFS or another application will fail with the "file is being
accessed by another process" error. The <code>FILE_SHARE_READ</code>,
<code>FILE_SHARE_WRITE</code>, and <code>FILE_SHARE_DELETE</code> may be

    }


    /**
     * 
     * @param dialect
     * @param sessionKey
     * @param preauthIntegrity
     * @return derived application key
     */
    public static byte[] dervieApplicationKey ( int dialect, byte[] sessionKey, byte[] preauthIntegrity ) {
        return derive(
            sessionKey,

application/mac-binhex40       hqx              # Macintosh binhexed archives
application/mspowerpoint       ppt              # Microsoft Powerpoint
application/msword             doc              # Microsoft Word
application/octet-stream       bin exe ani      # Binary File
application/oda                oda
application/pagemaker          pm5 pt5 pm       # PageMaker
application/pdf                pdf              # Adobe Acrobat

            ASN1TaggedObject mechToken = ASN1Util.as(ASN1TaggedObject.class, stream.readObject());
            if ( mechToken == null || mechToken.getTagClass() != BERTags.APPLICATION ||
                    !(mechToken.getBaseObject() instanceof ASN1Sequence) )
                throw new PACDecodingException("Malformed kerberos token");

                break;
            case 3:
                ASN1TaggedObject derTicket = ASN1Util.as(ASN1TaggedObject.class, tagged);
                if ( derTicket.getTagClass() != BERTags.APPLICATION )
                    throw new PACDecodingException("Malformed Kerberos Ticket");
                try {
                    this.ticket = new KerberosTicket(derTicket.getBaseObject().getEncoded(), this.apOptions, keys);

            ASN1OutputStream der = ASN1OutputStream.create(collector, ASN1Encoding.DER);
            DERTaggedObject derApplicationSpecific = new DERTaggedObject(false, BERTags.APPLICATION, 0, new DERSequence(ev));
            der.writeObject(derApplicationSpecific);
            return collector.toByteArray();
        }
        catch ( IOException ex ) {

        }
        is.close();
    }

    public String getMimeType( String extension ) throws IOException {
        return getMimeType( extension, "application/octet-stream" );
    }
    public String getMimeType( String extension, String def ) throws IOException {
        int state, t, x, i, off;
        byte ch;
        byte[] type = new byte[128];

    (For example, a function in a library to compute square roots has
    a purpose that is entirely well-defined independent of the
    application.  Therefore, Subsection 2d requires that any
    application-supplied function or table used by this function must
    be optional: if the application does not supply it, the square
    root function must still compute square roots.)

These requirements apply to the modified work as a whole.  If