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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.cmc;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.cert.X509CRLHolder;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.util.Encodable;
import org.bouncycastle.util.Store;

/**
 * Carrier for a Simple PKI Response.
 * 
 * A Simple PKI Response is defined in RFC 5272 as a CMS SignedData object with no EncapsulatedContentInfo
 * and no SignerInfos attached.
 * 
 */
public class SimplePKIResponse
    implements Encodable
{
    private final CMSSignedData certificateResponse;

    private static ContentInfo parseBytes(byte[] responseEncoding)
        throws CMCException
    {
        try
        {
            return ContentInfo.getInstance(ASN1Primitive.fromByteArray(responseEncoding));
        }
        catch (Exception e)
        {
            throw new CMCException("malformed data: " + e.getMessage(), e);
        }
    }

    /**
     * Create a SimplePKIResponse from the passed in bytes.
     *
     * @param responseEncoding BER/DER encoding of the certificate.
     * @throws CMCException in the event of corrupted data, or an incorrect structure.
     */
    public SimplePKIResponse(byte[] responseEncoding)
        throws CMCException
    {
        this(parseBytes(responseEncoding));
    }

    /**
     * Create a SimplePKIResponse from the passed in ASN.1 structure.
     *
     * @param signedData a ContentInfo containing a SignedData.
     */
    public SimplePKIResponse(ContentInfo signedData)
        throws CMCException
    {
        try
        {
            this.certificateResponse = new CMSSignedData(signedData);
        }
        catch (CMSException e)
        {
            throw new CMCException("malformed response: " + e.getMessage(), e);
        }

        if (certificateResponse.getSignerInfos().size() != 0)
        {
            throw new CMCException("malformed response: SignerInfo structures found");
        }
        if (certificateResponse.getSignedContent() != null)
        {
            throw new CMCException("malformed response: Signed Content found");
        }
    }

    /**
     * Return any X.509 certificate objects in this SimplePKIResponse structure as a Store of X509CertificateHolder objects.
     *
     * @return a Store of X509CertificateHolder objects.
     */
    public Store getCertificates()
    {
        return certificateResponse.getCertificates();
    }

    /**
     * Return any X.509 CRL objects in this SimplePKIResponse structure as a Store of X509CRLHolder objects.
     *
     * @return a Store of X509CRLHolder objects.
     */
    public Store getCRLs()
    {
        return certificateResponse.getCRLs();
    }

    /**
     * return the ASN.1 encoded representation of this object.
     */
    public byte[] getEncoded()
        throws IOException
    {
        return certificateResponse.getEncoded();
    }
}