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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 1.5 to JDK 1.8 with debug enabled.

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package org.bouncycastle.asn1.x509;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1GeneralizedTime;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 *  *    PrivateKeyUsagePeriod ::= SEQUENCE {
 *      notBefore       [0]     GeneralizedTime OPTIONAL,
 *      notAfter        [1]     GeneralizedTime OPTIONAL }
 * 
 */
public class PrivateKeyUsagePeriod
    extends ASN1Object
{
    public static PrivateKeyUsagePeriod getInstance(Object obj)
    {
        if (obj instanceof PrivateKeyUsagePeriod)
        {
            return (PrivateKeyUsagePeriod)obj;
        }

        if (obj != null)
        {
            return new PrivateKeyUsagePeriod(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    private ASN1GeneralizedTime _notBefore, _notAfter;

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

            if (tObj.getTagNo() == 0)
            {
                _notBefore = ASN1GeneralizedTime.getInstance(tObj, false);
            }
            else if (tObj.getTagNo() == 1)
            {
                _notAfter = ASN1GeneralizedTime.getInstance(tObj, false);
            }
        }
    }

    public ASN1GeneralizedTime getNotBefore()
    {
        return _notBefore;
    }

    public ASN1GeneralizedTime getNotAfter()
    {
        return _notAfter;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        if (_notBefore != null)
        {
            v.add(new DERTaggedObject(false, 0, _notBefore));
        }
        if (_notAfter != null)
        {
            v.add(new DERTaggedObject(false, 1, _notAfter));
        }

        return new DERSequence(v);
    }
}