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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 1.8 and up. 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.pkcs;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.pkcs.ContentInfo;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.SafeBag;
import org.bouncycastle.cms.CMSEncryptedData;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.operator.InputDecryptorProvider;

public class PKCS12SafeBagFactory
{
    private ASN1Sequence safeBagSeq;

    public PKCS12SafeBagFactory(ContentInfo info)
    {
        if (info.getContentType().equals(PKCSObjectIdentifiers.encryptedData))
        {
            throw new IllegalArgumentException("encryptedData requires constructor with decryptor.");
        }

        this.safeBagSeq = ASN1Sequence.getInstance(ASN1OctetString.getInstance(info.getContent()).getOctets());
    }

    public PKCS12SafeBagFactory(ContentInfo info, InputDecryptorProvider inputDecryptorProvider)
        throws PKCSException
    {
        if (info.getContentType().equals(PKCSObjectIdentifiers.encryptedData))
        {
            CMSEncryptedData encData = new CMSEncryptedData(org.bouncycastle.asn1.cms.ContentInfo.getInstance(info));

            try
            {
                this.safeBagSeq = ASN1Sequence.getInstance(encData.getContent(inputDecryptorProvider));
            }
            catch (CMSException e)
            {
                throw new PKCSException("unable to extract data: " + e.getMessage(), e);
            }
            return;
        }

        throw new IllegalArgumentException("encryptedData requires constructor with decryptor.");
    }

    public PKCS12SafeBag[] getSafeBags()
    {
        PKCS12SafeBag[] safeBags = new PKCS12SafeBag[safeBagSeq.size()];

        for (int i = 0; i != safeBagSeq.size(); i++)
        {
            safeBags[i] = new PKCS12SafeBag(SafeBag.getInstance(safeBagSeq.getObjectAt(i)));
        }

        return safeBags;
    }
}