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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.6.
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package org.bouncycastle.asn1;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.SimpleTimeZone;
import java.util.TimeZone;
/**
* Generalized time object.
*/
public class DERGeneralizedTime
extends ASN1Object
{
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;
}
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)
{
DERObject o = obj.getObject();
if (explicit || o instanceof DERGeneralizedTime)
{
return getInstance(o);
}
else
{
return new DERGeneralizedTime(((ASN1OctetString)o).getOctets());
}
}
/**
* The correct format for this is YYYYMMDDHHMMSS[.f]Z, or without the Z
* for local time, or Z+-HHMM on the end, for difference between local
* time and UTC time. The fractional second amount f must consist of at
* least one number with trailing zeroes removed.
*
* @param time the time string.
* @exception IllegalArgumentException if String is an illegal format.
*/
public DERGeneralizedTime(
String time)
{
this.time = time;
try
{
this.getDate();
}
catch (ParseException e)
{
throw new IllegalArgumentException("invalid date string: " + e.getMessage());
}
}
/**
* 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.
* @return The time string as it appeared in the encoded object.
*/
public String getTimeString()
{
return time;
}
/**
* 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.charAt(time.length() - 1) == 'Z')
{
return time.substring(0, time.length() - 1) + "GMT+00:00";
}
else
{
int signPos = time.length() - 5;
char sign = time.charAt(signPos);
if (sign == '-' || sign == '+')
{
return time.substring(0, signPos)
+ "GMT"
+ time.substring(signPos, signPos + 3)
+ ":"
+ time.substring(signPos + 3);
}
else
{
signPos = time.length() - 3;
sign = time.charAt(signPos);
if (sign == '-' || sign == '+')
{
return time.substring(0, signPos)
+ "GMT"
+ time.substring(signPos)
+ ":00";
}
}
}
return time + calculateGMTOffset();
}
private String calculateGMTOffset()
{
String sign = "+";
TimeZone timeZone = TimeZone.getDefault();
int offset = timeZone.getRawOffset();
if (offset < 0)
{
sign = "-";
offset = -offset;
}
int hours = offset / (60 * 60 * 1000);
int minutes = (offset - (hours * 60 * 60 * 1000)) / (60 * 1000);
try
{
if (timeZone.useDaylightTime() && timeZone.inDaylightTime(this.getDate()))
{
hours += sign.equals("+") ? 1 : -1;
}
}
catch (ParseException e)
{
// we'll do our best and ignore daylight savings
}
return "GMT" + sign + convert(hours) + ":" + convert(minutes);
}
private String convert(int time)
{
if (time < 10)
{
return "0" + time;
}
return Integer.toString(time);
}
public Date getDate()
throws ParseException
{
SimpleDateFormat dateF;
String d = time;
if (time.endsWith("Z"))
{
if (hasFractionalSeconds())
{
dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSS'Z'");
}
else
{
dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'");
}
dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
}
else if (time.indexOf('-') > 0 || time.indexOf('+') > 0)
{
d = this.getTime();
if (hasFractionalSeconds())
{
dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSSz");
}
else
{
dateF = new SimpleDateFormat("yyyyMMddHHmmssz");
}
dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
}
else
{
if (hasFractionalSeconds())
{
dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSS");
}
else
{
dateF = new SimpleDateFormat("yyyyMMddHHmmss");
}
dateF.setTimeZone(new SimpleTimeZone(0, TimeZone.getDefault().getID()));
}
if (hasFractionalSeconds())
{
// java misinterprets extra digits as being milliseconds...
String frac = d.substring(14);
int index;
for (index = 1; index < frac.length(); index++)
{
char ch = frac.charAt(index);
if (!('0' <= ch && ch <= '9'))
{
break;
}
}
if (index - 1 > 3)
{
frac = frac.substring(0, 4) + frac.substring(index);
d = d.substring(0, 14) + frac;
}
else if (index - 1 == 1)
{
frac = frac.substring(0, index) + "00" + frac.substring(index);
d = d.substring(0, 14) + frac;
}
else if (index - 1 == 2)
{
frac = frac.substring(0, index) + "0" + frac.substring(index);
d = d.substring(0, 14) + frac;
}
}
return dateF.parse(d);
}
private boolean hasFractionalSeconds()
{
return time.indexOf('.') == 14;
}
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());
}
boolean asn1Equals(
DERObject o)
{
if (!(o instanceof DERGeneralizedTime))
{
return false;
}
return time.equals(((DERGeneralizedTime)o).time);
}
public int hashCode()
{
return time.hashCode();
}
}