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

/**
 * packet giving time after creation at which the key expires.
 */
public class KeyExpirationTime 
    extends SignatureSubpacket
{
    protected static byte[] timeToBytes(
        long    t)
    {
        byte[]    data = new byte[4];
        
        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,
        boolean    isLongLength,
        byte[]     data)
    {
        super(SignatureSubpacketTags.KEY_EXPIRE_TIME, critical, isLongLength, data);
    }
    
    public KeyExpirationTime(
        boolean    critical,
        long       seconds)
    {
        super(SignatureSubpacketTags.KEY_EXPIRE_TIME, critical, false, timeToBytes(seconds));
    }
    
    /**
     * Return the number of seconds after creation time a key is valid for.
     * 
     * @return second count for key validity.
     */
    public long getTime()
    {
        long    time = ((long)(data[0] & 0xff) << 24) | ((data[1] & 0xff) << 16) | ((data[2] & 0xff) << 8) | (data[3] & 0xff);
        
        return time;
    }
}