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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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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 SignatureCreationTime 
    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 SignatureCreationTime(
        boolean    critical,
        boolean    isLongLength,
        byte[]     data)
    {
        super(SignatureSubpacketTags.CREATION_TIME, critical, isLongLength, data);
    }
    
    public SignatureCreationTime(
        boolean    critical,
        Date       date)
    {
        super(SignatureSubpacketTags.CREATION_TIME, critical, false, timeToBytes(date));
    }
    
    public Date getTime()
    {
        long    time = ((long)(data[0] & 0xff) << 24) | ((data[1] & 0xff) << 16) | ((data[2] & 0xff) << 8) | (data[3] & 0xff);
        
        return new Date(time * 1000);
    }
}