private static final Logger log = LoggerFactory.getLogger(SingletonContext.class);
    private static SingletonContext INSTANCE;


    /**
     * Initialize singleton context using custom properties
     * 
     * This method can only be called once.
     * 
     * @param props
     * @throws CIFSException
     */

 * should be sufficient for most needs.
 * 
 * If you want to retain the classic singleton behavior you can use
 * {@link jcifs.context.SingletonContext#getInstance()}
 * witch is initialized using system properties.
 * 
 */
@SuppressWarnings ( "javadoc" )
public class Config {

    private static final Logger log = LoggerFactory.getLogger(Config.class);


    /**

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs;


/**
 * A Windows SID is a numeric identifier used to represent Windows
 * accounts. SIDs are commonly represented using a textual format such as
 * <tt>S-1-5-21-1496946806-2192648263-3843101252-1029</tt> but they may
 * also be resolved to yield the name of the associated Windows account
 * such as <tt>Administrators</tt> or <tt>MYDOM\alice</tt>.

            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,
     * The MAC Key = Session Key
     * 
     * @param macSigningKey

 * and workgroups.
 * <p>
 * <font color="#800000"><i>Important: all SMB URLs that represent
 * workgroups, servers, shares, or directories require a trailing slash '/'.
 * </i></font>
 * <p>
 * When using the <tt>java.net.URL</tt> class with
 * 'smb1://' URLs it is necessary to first call the static
 * <tt>jcifs.smb1.Config.registerSmbURLHandler();</tt> method. This is required
 * to register the SMB protocol handler.
 * <p>

                 * not be the authority for the name. For example, if a WINS lookup
                 * for FOO fails and caches unknownAddress for FOO, a subsequent
                 * lookup for FOO using BCAST should not fail because of that
                 * name cached from WINS.
                 *
                 * So, here we apply the source addresses hashCode to each name to

        context[3] = 0x10325476;
        count = 0L;
        for (int i = 0; i < BLOCK_LENGTH; i++)
            buffer[i] = 0;
    }

    /**
     * Continues an MD4 message digest using the input byte.
     */
    public void engineUpdate (byte b) {
        // compute number of bytes still unhashed; ie. present in buffer
        int i = (int)(count % BLOCK_LENGTH);

         * not be the authority for the name. For example, if a WINS lookup
         * for FOO fails and caches unknownAddress for FOO, a subsequent
         * lookup for FOO using BCAST should not fail because of that
         * name cached from WINS.
         *
         * So, here we apply the source addresses hashCode to each name to
         * make them specific to who resolved the name.

// TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE, OR NON-INFRINGEMENT. WIDGET WORKSHOP SHALL NOT BE LIABLE
// FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
// DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
//
// THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
// CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE

    /**
     * @return a child context using anonymous credentials
     */
    CIFSContext withAnonymousCredentials ();


    /**
     * 
     * @return a child context using guest credentials
     */
    CIFSContext withGuestCrendentials ();


    /**
     * 
     * @param creds
     * @return a child context using using the given credentials
     */