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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.cert.crmf;

import java.io.IOException;

import org.bouncycastle.asn1.cms.EnvelopedData;
import org.bouncycastle.asn1.crmf.CRMFObjectIdentifiers;
import org.bouncycastle.asn1.crmf.EncKeyWithID;
import org.bouncycastle.asn1.crmf.EncryptedKey;
import org.bouncycastle.asn1.crmf.PKIArchiveOptions;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.cms.CMSEnvelopedData;
import org.bouncycastle.cms.CMSEnvelopedDataGenerator;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.RecipientInfoGenerator;
import org.bouncycastle.operator.OutputEncryptor;

/**
 * Builder for a PKIArchiveControl structure.
 */
public class PKIArchiveControlBuilder
{
    private CMSEnvelopedDataGenerator envGen;
    private CMSProcessableByteArray keyContent;

    /**
     * Basic constructor - specify the contents of the PKIArchiveControl structure.
     *
     * @param privateKeyInfo the private key to be archived.
     * @param generalName the general name to be associated with the private key.
     */
    public PKIArchiveControlBuilder(PrivateKeyInfo privateKeyInfo, GeneralName generalName)
    {
        EncKeyWithID encKeyWithID = new EncKeyWithID(privateKeyInfo, generalName);

        try
        {
            this.keyContent = new CMSProcessableByteArray(CRMFObjectIdentifiers.id_ct_encKeyWithID, encKeyWithID.getEncoded());
        }
        catch (IOException e)
        {
            throw new IllegalStateException("unable to encode key and general name info");
        }

        this.envGen = new CMSEnvelopedDataGenerator();
    }

    /**
     * Add a recipient generator to this control.
     *
     * @param recipientGen recipient generator created for a specific recipient.
     * @return this builder object.
     */
    public PKIArchiveControlBuilder addRecipientGenerator(RecipientInfoGenerator recipientGen)
    {
        envGen.addRecipientInfoGenerator(recipientGen);

        return this;
    }

    /**
     * Build the PKIArchiveControl using the passed in encryptor to encrypt its contents.
     *
     * @param contentEncryptor a suitable content encryptor.
     * @return a PKIArchiveControl object.
     * @throws CMSException in the event the build fails.
     */
    public PKIArchiveControl build(OutputEncryptor contentEncryptor)
        throws CMSException
    {
        CMSEnvelopedData envContent = envGen.generate(keyContent, contentEncryptor);

        EnvelopedData envD = EnvelopedData.getInstance(envContent.toASN1Structure().getContent());

        return new PKIArchiveControl(new PKIArchiveOptions(new EncryptedKey(envD)));
    }
}