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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.pkcs;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.pkcs.Attribute;
import org.bouncycastle.asn1.pkcs.CRLBag;
import org.bouncycastle.asn1.pkcs.CertBag;
import org.bouncycastle.asn1.pkcs.EncryptedPrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.SafeBag;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.asn1.x509.CertificateList;
import org.bouncycastle.cert.X509CRLHolder;
import org.bouncycastle.cert.X509CertificateHolder;

public class PKCS12SafeBag
{
    public static final ASN1ObjectIdentifier friendlyNameAttribute = PKCSObjectIdentifiers.pkcs_9_at_friendlyName;
    public static final ASN1ObjectIdentifier localKeyIdAttribute = PKCSObjectIdentifiers.pkcs_9_at_localKeyId;

    private SafeBag safeBag;

    public PKCS12SafeBag(SafeBag safeBag)
    {
        this.safeBag = safeBag;
    }

    /**
     * Return the underlying ASN.1 structure for this safe bag.
     *
     * @return a SafeBag
     */
    public SafeBag toASN1Structure()
    {
        return safeBag;
    }

    /**
     * Return the BagId giving the type of content in the bag.
     *
     * @return the bagId
     */
    public ASN1ObjectIdentifier getType()
    {
        return safeBag.getBagId();
    }

    public Attribute[] getAttributes()
    {
        ASN1Set attrs = safeBag.getBagAttributes();

        if (attrs == null)
        {
            return null;
        }

        Attribute[] attributes = new Attribute[attrs.size()];
        for (int i = 0; i != attrs.size(); i++)
        {
            attributes[i] = Attribute.getInstance(attrs.getObjectAt(i));
        }

        return attributes;
    }

    public Object getBagValue()
    {
        if (getType().equals(PKCSObjectIdentifiers.pkcs8ShroudedKeyBag))
        {
            return new PKCS8EncryptedPrivateKeyInfo(EncryptedPrivateKeyInfo.getInstance(safeBag.getBagValue()));
        }
        if (getType().equals(PKCSObjectIdentifiers.certBag))
        {
            CertBag certBag = CertBag.getInstance(safeBag.getBagValue());

            return new X509CertificateHolder(Certificate.getInstance(ASN1OctetString.getInstance(certBag.getCertValue()).getOctets()));
        }
        if (getType().equals(PKCSObjectIdentifiers.keyBag))
        {
            return PrivateKeyInfo.getInstance(safeBag.getBagValue());
        }
        if (getType().equals(PKCSObjectIdentifiers.crlBag))
        {
            CRLBag crlBag = CRLBag.getInstance(safeBag.getBagValue());

            return new X509CRLHolder(CertificateList.getInstance(ASN1OctetString.getInstance(crlBag.getCRLValue()).getOctets()));
        }

        return safeBag.getBagValue();
    }
}