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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.DERSequence;
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;

public class CertificateConfirmationContentBuilder
{
    private DigestAlgorithmIdentifierFinder digestAlgFinder;
    private List acceptedCerts = 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)
    {
        acceptedCerts.add(certHolder);
        acceptedReqIds.add(certReqID);

        return this;
    }

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

        for (int i = 0; i != acceptedCerts.size(); i++)
        {
            X509CertificateHolder certHolder = (X509CertificateHolder)acceptedCerts.get(i);
            BigInteger reqID = (BigInteger)acceptedReqIds.get(i);

            AlgorithmIdentifier digAlg = digestAlgFinder.find(certHolder.toASN1Structure().getSignatureAlgorithm());
            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.toASN1Structure(), digester.getOutputStream());

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

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

}