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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.cmp;

import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.cmp.CMPCertificate;
import org.bouncycastle.asn1.cmp.CertConfirmContent;
import org.bouncycastle.asn1.cmp.CertStatus;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;

/**
 * Builder class for a {@link CertConfirmContent} message.
 */
public class CertificateConfirmationContentBuilder
{
    private DigestAlgorithmIdentifierFinder digestAlgFinder;
    private List acceptedCerts = new ArrayList();
    private List acceptedSignatureAlgorithms = new ArrayList();
    private List acceptedReqIds = new ArrayList();

    public CertificateConfirmationContentBuilder()
    {
        this(new DefaultDigestAlgorithmIdentifierFinder());
    }

    public CertificateConfirmationContentBuilder(DigestAlgorithmIdentifierFinder digestAlgFinder)
    {
        this.digestAlgFinder = digestAlgFinder;
    }
    
    public CertificateConfirmationContentBuilder addAcceptedCertificate(X509CertificateHolder certHolder, BigInteger certReqID)
    {
        return addAcceptedCertificate(certHolder, new ASN1Integer(certReqID));
    }

    public CertificateConfirmationContentBuilder addAcceptedCertificate(X509CertificateHolder certHolder, ASN1Integer certReqID)
    {
        return addAcceptedCertificate(new CMPCertificate(certHolder.toASN1Structure()), certHolder.getSignatureAlgorithm(), certReqID);
    }

    public CertificateConfirmationContentBuilder addAcceptedCertificate(CMPCertificate cmpCertificate, AlgorithmIdentifier sigAlg, ASN1Integer certReqID)
    {
        acceptedCerts.add(cmpCertificate);
        acceptedSignatureAlgorithms.add(sigAlg);
        acceptedReqIds.add(certReqID);

        return this;
    }

    public CertificateConfirmationContent build(DigestCalculatorProvider digesterProvider)
        throws CMPException
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        for (int i = 0; i != acceptedCerts.size(); i++)
        {
            CMPCertificate certHolder = (CMPCertificate)acceptedCerts.get(i);
            ASN1Integer reqID = (ASN1Integer)acceptedReqIds.get(i);

            AlgorithmIdentifier digAlg = digestAlgFinder.find((AlgorithmIdentifier)acceptedSignatureAlgorithms.get(i));
            if (digAlg == null)
            {
                throw new CMPException("cannot find algorithm for digest from signature");
            }

            DigestCalculator digester;

            try
            {
                digester = digesterProvider.get(digAlg);
            }
            catch (OperatorCreationException e)
            {
                throw new CMPException("unable to create digest: " + e.getMessage(), e);
            }

            CMPUtil.derEncodeToStream(certHolder, digester.getOutputStream());

            v.add(new CertStatus(digester.getDigest(), reqID));
        }

        return new CertificateConfirmationContent(CertConfirmContent.getInstance(new DERSequence(v)), digestAlgFinder);
    }

}