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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.cert.crmf;

import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.cms.CMSObjectIdentifiers;
import org.spongycastle.asn1.cms.ContentInfo;
import org.spongycastle.asn1.cms.EnvelopedData;
import org.spongycastle.asn1.crmf.CRMFObjectIdentifiers;
import org.spongycastle.asn1.crmf.EncryptedKey;
import org.spongycastle.asn1.crmf.PKIArchiveOptions;
import org.spongycastle.cms.CMSEnvelopedData;
import org.spongycastle.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);
        }
    }
}