package org.bouncycastle.bcpg.sig;

import java.util.Date;

import org.bouncycastle.bcpg.SignatureSubpacket;
import org.bouncycastle.bcpg.SignatureSubpacketTags;

/**
 * packet giving signature creation time.
 */
public class KeyExpirationTime 
	extends SignatureSubpacket
{
	protected static byte[] timeToBytes(
		Date	date)
	{
		byte[]	data = new byte[4];
		long		t = date.getTime() / 1000;
		
		data[0] = (byte)(t >> 24);
		data[1] = (byte)(t >> 16);
		data[2] = (byte)(t >> 8);
		data[3] = (byte)t;
		
		return data;
	}
	
	public KeyExpirationTime(
		boolean	critical,
		byte[]		data)
	{
		super(SignatureSubpacketTags.KEY_EXPIRE_TIME, critical, data);
	}
	
	public KeyExpirationTime(
		boolean	critical,
		Date			date)
	{
		super(SignatureSubpacketTags.KEY_EXPIRE_TIME, critical, timeToBytes(date));
	}
	
	public Date getTime()
	{
		long	time = ((long)(data[0] & 0xff) << 24) | ((data[1] & 0xff) << 16) | ((data[1] & 0xff) << 8) | (data[1] & 0xff);
		
		return new Date(time * 1000);
	}
}
