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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.dvcs;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.SignedData;
import org.bouncycastle.asn1.dvcs.DVCSObjectIdentifiers;
import org.bouncycastle.cms.CMSSignedData;

/**
 * DVCResponse is general response to DVCS (RFC 3029).
 * It represents responses for all types of services.
 */
public class DVCSResponse
    extends DVCSMessage
{
    private org.bouncycastle.asn1.dvcs.DVCSResponse asn1;

    /**
     * Constructs DVCResponse from CMS SignedData object.
     *
     * @param signedData the CMS SignedData object containing the request
     * @throws org.bouncycastle.dvcs.DVCSConstructionException
     */
    public DVCSResponse(CMSSignedData signedData)
        throws DVCSConstructionException
    {
        this(SignedData.getInstance(signedData.toASN1Structure().getContent()).getEncapContentInfo());
    }

    /**
     * Construct a DVCS Response from a ContentInfo
     *
     * @param contentInfo the contentInfo representing the DVCSRequest
     * @throws org.bouncycastle.dvcs.DVCSConstructionException
     */
    public DVCSResponse(ContentInfo contentInfo)
        throws DVCSConstructionException
    {
        super(contentInfo);

        if (!DVCSObjectIdentifiers.id_ct_DVCSResponseData.equals(contentInfo.getContentType()))
        {
            throw new DVCSConstructionException("ContentInfo not a DVCS Response");
        }

        try
        {
            if (contentInfo.getContent().toASN1Primitive() instanceof ASN1Sequence)
            {
                this.asn1 = org.bouncycastle.asn1.dvcs.DVCSResponse.getInstance(contentInfo.getContent());
            }
            else
            {
                this.asn1 = org.bouncycastle.asn1.dvcs.DVCSResponse.getInstance(ASN1OctetString.getInstance(contentInfo.getContent()).getOctets());
            }
        }
        catch (Exception e)
        {
            throw new DVCSConstructionException("Unable to parse content: " + e.getMessage(), e);
        }
    }

    /**
     * Return the ASN.1 DVCSResponse structure making up the body of this response.
     *
     * @return an org.bouncycastle.asn1.dvcs.DVCSResponse object.
     */
    public ASN1Encodable getContent()
    {
        return asn1;
    }
}