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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 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 java.io.IOException;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DLSequence;
import org.bouncycastle.asn1.pkcs.AuthenticatedSafe;
import org.bouncycastle.asn1.pkcs.ContentInfo;
import org.bouncycastle.asn1.pkcs.MacData;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.Pfx;
import org.bouncycastle.cms.CMSEncryptedDataGenerator;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.operator.OutputEncryptor;

/**
 * A builder for the PKCS#12 Pfx key and certificate store.
 * 
 * For example: you can build a basic key store for the user owning privKey as follows:
 * 
 *  *      X509Certificate[] chain = ....
 *      PublicKey         pubKey = ....
 *      PrivateKey        privKey = ....
 *      JcaX509ExtensionUtils extUtils = new JcaX509ExtensionUtils();
 *
 *      PKCS12SafeBagBuilder taCertBagBuilder = new JcaPKCS12SafeBagBuilder(chain[2]);
 *
 *      taCertBagBuilder.addBagAttribute(PKCSObjectIdentifiers.pkcs_9_at_friendlyName, new DERBMPString("Bouncy Primary Certificate"));
 *
 *      PKCS12SafeBagBuilder caCertBagBuilder = new JcaPKCS12SafeBagBuilder(chain[1]);
 *
 *      caCertBagBuilder.addBagAttribute(PKCSObjectIdentifiers.pkcs_9_at_friendlyName, new DERBMPString("Bouncy Intermediate Certificate"));
 *
 *      PKCS12SafeBagBuilder eeCertBagBuilder = new JcaPKCS12SafeBagBuilder(chain[0]);
 *
 *      eeCertBagBuilder.addBagAttribute(PKCSObjectIdentifiers.pkcs_9_at_friendlyName, new DERBMPString("Eric's Key"));
 *      eeCertBagBuilder.addBagAttribute(PKCSObjectIdentifiers.pkcs_9_at_localKeyId, extUtils.createSubjectKeyIdentifier(pubKey));
 *
 *      PKCS12SafeBagBuilder keyBagBuilder = new JcaPKCS12SafeBagBuilder(privKey, new BcPKCS12PBEOutputEncryptorBuilder(PKCSObjectIdentifiers.pbeWithSHAAnd3_KeyTripleDES_CBC, new CBCBlockCipher(new DESedeEngine())).build(passwd));
 *
 *      keyBagBuilder.addBagAttribute(PKCSObjectIdentifiers.pkcs_9_at_friendlyName, new DERBMPString("Eric's Key"));
 *      keyBagBuilder.addBagAttribute(PKCSObjectIdentifiers.pkcs_9_at_localKeyId, extUtils.createSubjectKeyIdentifier(pubKey));
 *
 *      //
 *      // construct the actual key store
 *      //
 *      PKCS12PfxPduBuilder pfxPduBuilder = new PKCS12PfxPduBuilder();
 *
 *      PKCS12SafeBag[] certs = new PKCS12SafeBag[3];
 *
 *      certs[0] = eeCertBagBuilder.build();
 *      certs[1] = caCertBagBuilder.build();
 *      certs[2] = taCertBagBuilder.build();
 *
 *      pfxPduBuilder.addEncryptedData(new BcPKCS12PBEOutputEncryptorBuilder(PKCSObjectIdentifiers.pbeWithSHAAnd40BitRC2_CBC, new CBCBlockCipher(new RC2Engine())).build(passwd), certs);
 *
 *      pfxPduBuilder.addData(keyBagBuilder.build());
 *
 *      PKCS12PfxPdu pfx = pfxPduBuilder.build(new BcPKCS12MacCalculatorBuilder(), passwd);
 * 
 *
 */
public class PKCS12PfxPduBuilder
{
    private ASN1EncodableVector dataVector = new ASN1EncodableVector();

    /**
     * Add a SafeBag that is to be included as is.
     *
     * @param data the SafeBag to add.
     * @return this builder.
     * @throws IOException
     */
    public PKCS12PfxPduBuilder addData(PKCS12SafeBag data)
        throws IOException
    {
        dataVector.add(new ContentInfo(PKCSObjectIdentifiers.data, new DEROctetString(new DLSequence(data.toASN1Structure()).getEncoded())));

        return this;
    }

    /**
     * Add a SafeBag that is to be wrapped in a EncryptedData object.
     *
     * @param dataEncryptor the encryptor to use for encoding the data.
     * @param data the SafeBag to include.
     * @return this builder.
     * @throws IOException if a issue occurs processing the data.
     */
    public PKCS12PfxPduBuilder addEncryptedData(OutputEncryptor dataEncryptor, PKCS12SafeBag data)
        throws IOException
    {
        return addEncryptedData(dataEncryptor, new DERSequence(data.toASN1Structure()));
    }

    /**
     * Add a set of SafeBags that are to be wrapped in a EncryptedData object.
     *
     * @param dataEncryptor the encryptor to use for encoding the data.
     * @param data the SafeBags to include.
     * @return this builder.
     * @throws IOException if a issue occurs processing the data.
     */
    public PKCS12PfxPduBuilder addEncryptedData(OutputEncryptor dataEncryptor, PKCS12SafeBag[] data)
        throws IOException
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        for (int i = 0; i != data.length; i++)
        {
            v.add(data[i].toASN1Structure());
        }

        return addEncryptedData(dataEncryptor, new DLSequence(v));
    }

    private PKCS12PfxPduBuilder addEncryptedData(OutputEncryptor dataEncryptor, ASN1Sequence data)
        throws IOException
    {
        CMSEncryptedDataGenerator envGen = new CMSEncryptedDataGenerator();

        try
        {
            dataVector.add(envGen.generate(new CMSProcessableByteArray(data.getEncoded()), dataEncryptor).toASN1Structure());
        }
        catch (CMSException e)
        {
            throw new PKCSIOException(e.getMessage(), e.getCause());
        }

        return this;
    }

    /**
     * Build the Pfx structure, protecting it with a MAC calculated against the passed in password.
     *
     * @param macCalcBuilder a builder for a PKCS12 mac calculator.
     * @param password the password to use.
     * @return a Pfx object.
     * @throws PKCSException on a encoding or processing error.
     */
    public PKCS12PfxPdu build(PKCS12MacCalculatorBuilder macCalcBuilder, char[] password)
        throws PKCSException
    {
        AuthenticatedSafe auth = AuthenticatedSafe.getInstance(new DLSequence(dataVector));
        byte[]            encAuth;

        try
        {
            encAuth = auth.getEncoded();
        }
        catch (IOException e)
        {
            throw new PKCSException("unable to encode AuthenticatedSafe: " + e.getMessage(), e);
        }

        ContentInfo       mainInfo = new ContentInfo(PKCSObjectIdentifiers.data, new DEROctetString(encAuth));
        MacData           mData = null;

        if (macCalcBuilder != null)
        {
            MacDataGenerator mdGen = new MacDataGenerator(macCalcBuilder);

            mData = mdGen.build(password, encAuth);
        }

        //
        // output the Pfx
        //
        Pfx pfx = new Pfx(mainInfo, mData);

        return new PKCS12PfxPdu(pfx);
    }
}