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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.Locale;
import java.util.SimpleTimeZone;
import java.util.TimeZone;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Strings;
/**
* Base class representing the ASN.1 GeneralizedTime type.
*
* The main difference between these and UTC time is a 4 digit year.
*
*
* One second resolution date+time on UTC timezone (Z)
* with 4 digit year (valid from 0001 to 9999).
*
* Timestamp format is: yyyymmddHHMMSS'Z'
*
*
X.690
* This is what is called "restricted string",
* and it uses ASCII characters to encode digits and supplemental data.
*
* 11: Restrictions on BER employed by both CER and DER
* 11.7 GeneralizedTime
*
* 11.7.1 The encoding shall terminate with a "Z",
* as described in the ITU-T Rec. X.680 | ISO/IEC 8824-1 clause on
* GeneralizedTime.
*
* 11.7.2 The seconds element shall always be present.
*
*
* 11.7.3 The fractional-seconds elements, if present,
* shall omit all trailing zeros; if the elements correspond to 0,
* they shall be wholly omitted, and the decimal point element also
* shall be omitted.
*/
public class ASN1GeneralizedTime
extends ASN1Primitive
{
protected byte[] time;
/**
* return a generalized time from the passed in object
*
* @param obj an ASN1GeneralizedTime or an object that can be converted into one.
* @return an ASN1GeneralizedTime instance, or null.
* @throws IllegalArgumentException if the object cannot be converted.
*/
public static ASN1GeneralizedTime getInstance(
Object obj)
{
if (obj == null || obj instanceof ASN1GeneralizedTime)
{
return (ASN1GeneralizedTime)obj;
}
if (obj instanceof byte[])
{
try
{
return (ASN1GeneralizedTime)fromByteArray((byte[])obj);
}
catch (Exception e)
{
throw new IllegalArgumentException("encoding error in getInstance: " + e.toString());
}
}
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.
* @return an ASN1GeneralizedTime instance.
* @throws IllegalArgumentException if the tagged object cannot
* be converted.
*/
public static ASN1GeneralizedTime getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
ASN1Primitive o = obj.getObject();
if (explicit || o instanceof ASN1GeneralizedTime)
{
return getInstance(o);
}
else
{
return new ASN1GeneralizedTime(ASN1OctetString.getInstance(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.
* @throws IllegalArgumentException if String is an illegal format.
*/
public ASN1GeneralizedTime(
String time)
{
this.time = Strings.toByteArray(time);
try
{
this.getDate();
}
catch (ParseException e)
{
throw new IllegalArgumentException("invalid date string: " + e.getMessage());
}
}
/**
* Base constructor from a java.util.date object
*
* @param time a date object representing the time of interest.
*/
public ASN1GeneralizedTime(
Date time)
{
SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'", DateUtil.EN_Locale);
dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
this.time = Strings.toByteArray(dateF.format(time));
}
/**
* Base constructor from a java.util.date and Locale - you may need to use this if the default locale
* doesn't use a Gregorian calender so that the GeneralizedTime produced is compatible with other ASN.1 implementations.
*
* @param time a date object representing the time of interest.
* @param locale an appropriate Locale for producing an ASN.1 GeneralizedTime value.
*/
public ASN1GeneralizedTime(
Date time,
Locale locale)
{
SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'", locale);
dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
this.time = Strings.toByteArray(dateF.format(time));
}
ASN1GeneralizedTime(
byte[] bytes)
{
if (bytes.length < 4)
{
throw new IllegalArgumentException("GeneralizedTime string too short");
}
this.time = bytes;
if (!(isDigit(0) && isDigit(1) && isDigit(2) && isDigit(3)))
{
throw new IllegalArgumentException("illegal characters in GeneralizedTime string");
}
}
/**
* Return the time.
*
* @return The time string as it appeared in the encoded object.
*/
public String getTimeString()
{
return Strings.fromByteArray(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");
*