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JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java
There is a newer version: 1.3.18.1
/* Copyright (c) 2000 The Legion Of The Bouncy Castle
 * (http://www.bouncycastle.org)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package jcifs.spnego.asn1;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.SimpleTimeZone;

/**
 * Generalized time object.
 */
public class DERGeneralizedTime
    extends DERObject
{
    String      time;

    /**
     * return a generalized time from the passed in object
     *
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static DERGeneralizedTime getInstance(
        Object  obj)
    {
        if (obj == null || obj instanceof DERGeneralizedTime)
        {
            return (DERGeneralizedTime)obj;
        }

        if (obj instanceof ASN1OctetString)
        {
            return new DERGeneralizedTime(((ASN1OctetString)obj).getOctets());
        }

        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
    }

    /**
     * return a Generalized Time object from a tagged object.
     *
     * @param obj the tagged object holding the object we want
     * @param explicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the tagged object cannot
     *               be converted.
     */
    public static DERGeneralizedTime getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(obj.getObject());
    }
    
    /**
     * The correct format for this is YYYYMMDDHHMMSSZ, or without the Z
     * for local time, or Z+-HHMM on the end, for difference between local
     * time and UTC time.
     * 
     *
     * @param time the time string.
     */
    public DERGeneralizedTime(
        String  time)
    {
        this.time = time;
    }

    /**
     * base constructer from a java.util.date object
     */
    public DERGeneralizedTime(
        Date time)
    {
        SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'");

        dateF.setTimeZone(new SimpleTimeZone(0,"Z"));

        this.time = dateF.format(time);
    }

    DERGeneralizedTime(
        byte[]  bytes)
    {
        //
        // explicitly convert to characters
        //
        char[]  dateC = new char[bytes.length];

        for (int i = 0; i != dateC.length; i++)
        {
            dateC[i] = (char)(bytes[i] & 0xff);
        }

        this.time = new String(dateC);
    }

    /**
     * return the time - always in the form of 
     *  YYYYMMDDhhmmssGMT(+hh:mm|-hh:mm).
     * 

     * Normally in a certificate we would expect "Z" rather than "GMT",
     * however adding the "GMT" means we can just use:
     * 
     *     dateF = new SimpleDateFormat("yyyyMMddHHmmssz");
     * 
     * To read in the time and get a date which is compatible with our local
     * time zone.
     */
    public String getTime()
    {
        //
        // standardise the format.
        //
        if (time.length() == 15)
        {
            return time.substring(0, 14) + "GMT+00:00";
        }
        else if (time.length() == 17)
        {
            return time.substring(0, 14) + "GMT" + time.substring(15, 17) + ":" + time.substring(17, 19);
        }

        return time;
    }

    private byte[] getOctets()
    {
        char[]  cs = time.toCharArray();
        byte[]  bs = new byte[cs.length];

        for (int i = 0; i != cs.length; i++)
        {
            bs[i] = (byte)cs[i];
        }

        return bs;
    }


    void encode(
        DEROutputStream  out)
        throws IOException
    {
        out.writeEncoded(GENERALIZED_TIME, this.getOctets());
    }
    
    public boolean equals(
        Object  o)
    {
        if ((o == null) || !(o instanceof DERGeneralizedTime))
        {
            return false;
        }

        return time.equals(((DERGeneralizedTime)o).time);
    }
}