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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 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.cert.cmp;

import java.math.BigInteger;

import org.bouncycastle.asn1.cmp.CertStatus;
import org.bouncycastle.asn1.cmp.PKIStatusInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.operator.DigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.util.Arrays;

public class CertificateStatus
{
    private DigestAlgorithmIdentifierFinder digestAlgFinder;    
    private CertStatus certStatus;

    CertificateStatus(DigestAlgorithmIdentifierFinder digestAlgFinder, CertStatus certStatus)
    {
        this.digestAlgFinder = digestAlgFinder;
        this.certStatus = certStatus;
    }

    public PKIStatusInfo getStatusInfo()
    {
        return certStatus.getStatusInfo();
    }

    public BigInteger getCertRequestID()
    {
        return certStatus.getCertReqId().getValue();
    }

    public boolean isVerified(X509CertificateHolder certHolder, DigestCalculatorProvider digesterProvider)
        throws CMPException
    {
        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 digester: " + e.getMessage(), e);
        }

        CMPUtil.derEncodeToStream(certHolder.toASN1Structure(), digester.getOutputStream());

        return Arrays.areEqual(certStatus.getCertHash().getOctets(), digester.getDigest());
    }
}