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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.6.

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package org.bouncycastle.asn1.crmf;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.Time;

import java.util.Enumeration;

public class OptionalValidity
    extends ASN1Encodable
{
    private Time notBefore;
    private Time notAfter;

    private OptionalValidity(ASN1Sequence seq)
    {
        Enumeration en = seq.getObjects();
        while (en.hasMoreElements())
        {
            ASN1TaggedObject tObj = (ASN1TaggedObject)en.nextElement();

            if (tObj.getTagNo() == 0)
            {
                notBefore = Time.getInstance(tObj, true);
            }
            else
            {
                notAfter = Time.getInstance(tObj, true);
            }
        }
    }

    public static OptionalValidity getInstance(Object o)
    {
        if (o instanceof OptionalValidity)
        {
            return (OptionalValidity)o;
        }

        if (o instanceof ASN1Sequence)
        {
            return new OptionalValidity((ASN1Sequence)o);
        }

        throw new IllegalArgumentException("Invalid object: " + o.getClass().getName());
    }

    /**
     *      * OptionalValidity ::= SEQUENCE {
     *                        notBefore  [0] Time OPTIONAL,
     *                        notAfter   [1] Time OPTIONAL } --at least one MUST be present
     * 
     * @return a basic ASN.1 object representation.
     */
    public DERObject toASN1Object()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        if (notBefore != null)
        {
            v.add(new DERTaggedObject(true, 0, notBefore));
        }

        if (notAfter != null)
        {
            v.add(new DERTaggedObject(true, 1, notAfter));
        }

        return new DERSequence(v);
    }
}