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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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());
    }
}