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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 org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.EnvelopedData;
import org.bouncycastle.asn1.crmf.CRMFObjectIdentifiers;
import org.bouncycastle.asn1.crmf.EncryptedKey;
import org.bouncycastle.asn1.crmf.PKIArchiveOptions;
import org.bouncycastle.cms.CMSEnvelopedData;
import org.bouncycastle.cms.CMSException;

/**
 * Carrier for a PKIArchiveOptions structure.
 */
public class PKIArchiveControl
    implements Control
{
    public static final int encryptedPrivKey = PKIArchiveOptions.encryptedPrivKey;
    public static final int keyGenParameters = PKIArchiveOptions.keyGenParameters;
    public static final int archiveRemGenPrivKey = PKIArchiveOptions.archiveRemGenPrivKey;

    private static final ASN1ObjectIdentifier type = CRMFObjectIdentifiers.id_regCtrl_pkiArchiveOptions;

    private final PKIArchiveOptions pkiArchiveOptions;

    /**
     * Basic constructor - build from an PKIArchiveOptions structure.
     *
     * @param pkiArchiveOptions  the ASN.1 structure that will underlie this control.
     */
    public PKIArchiveControl(PKIArchiveOptions pkiArchiveOptions)
    {
        this.pkiArchiveOptions = pkiArchiveOptions;
    }

    /**
     * Return the type of this control.
     *
     * @return CRMFObjectIdentifiers.id_regCtrl_pkiArchiveOptions
     */
    public ASN1ObjectIdentifier getType()
    {
        return type;
    }

    /**
     * Return the underlying ASN.1 object.
     *
     * @return a PKIArchiveOptions structure.
     */
    public ASN1Encodable getValue()
    {
        return pkiArchiveOptions;
    }

    /**
     * Return the archive control type, one of: encryptedPrivKey,keyGenParameters,or archiveRemGenPrivKey.
     *
     * @return the archive control type.
     */
    public int getArchiveType()
    {
        return pkiArchiveOptions.getType();
    }

    /**
     * Return whether this control contains enveloped data.
     *
     * @return true if the control contains enveloped data, false otherwise.
     */
    public boolean isEnvelopedData()
    {
        EncryptedKey encKey = EncryptedKey.getInstance(pkiArchiveOptions.getValue());

        return !encKey.isEncryptedValue();
    }

    /**
     * Return the enveloped data structure contained in this control.
     *
     * @return a CMSEnvelopedData object.
     */
    public CMSEnvelopedData getEnvelopedData()
        throws CRMFException
    {
        try
        {
            EncryptedKey encKey = EncryptedKey.getInstance(pkiArchiveOptions.getValue());
            EnvelopedData data = EnvelopedData.getInstance(encKey.getValue());

            return new CMSEnvelopedData(new ContentInfo(CMSObjectIdentifiers.envelopedData, data));
        }
        catch (CMSException e)
        {
            throw new CRMFException("CMS parsing error: " + e.getMessage(), e.getCause());
        }
        catch (Exception e)
        {
            throw new CRMFException("CRMF parsing error: " + e.getMessage(), e);
        }
    }
}