package org.bouncycastle.asn1.pkcs;import java.io.*;import java.math.BigInteger;import org.bouncycastle.asn1.*;import org.bouncycastle.asn1.util.*;import org.bouncycastle.util.encoders.*;/** * the infamous Pfx from PKCS12 */public class Pfx    implements DEREncodable, PKCSObjectIdentifiers{    private ContentInfo             contentInfo;    private MacData                 macData = null;    public Pfx(        ASN1Sequence   seq)    {        BigInteger  version = ((DERInteger)seq.getObjectAt(0)).getValue();        if (version.intValue() != 3)        {            throw new IllegalArgumentException("wrong version for PFX PDU");        }        contentInfo = ContentInfo.getInstance(seq.getObjectAt(1));        if (seq.size() == 3)        {            macData = MacData.getInstance(seq.getObjectAt(2));        }    }    public Pfx(        ContentInfo     contentInfo,        MacData         macData)    {        this.contentInfo = contentInfo;        this.macData = macData;    }    public ContentInfo getAuthSafe()    {        return contentInfo;    }    public MacData getMacData()    {        return macData;    }    public DERObject getDERObject()    {        BERConstructedSequence   seq = new BERConstructedSequence();        seq.addObject(new DERInteger(3));        seq.addObject(contentInfo);        if (macData != null)        {            seq.addObject(macData);        }        return seq;    }}