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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 LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.bcpg.sig;

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

/**
 * Signature Subpacket containing the number of seconds after the key's creation date, after which the key expires.
 * The special value of {@code 0} means that the key never expires.
 *
 * @see 
 *     RFC4880 - Key Expiration Time
 * @see 
 *     RFC9580 - Key Expiration Time
 */
public class KeyExpirationTime 
    extends SignatureSubpacket
{
    /**
     * @deprecated Will be removed
     */
    protected static byte[] timeToBytes(
        long    t)
    {
        return Utils.timeToBytes(t);
    }

    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, Utils.timeToBytes(seconds));
    }

    /**
     * Return the number of seconds after creation time a key is valid for.
     * 
     * @return second count for key validity.
     */
    public long getTime()
    {
        return Utils.timeFromBytes(data);
    }
}