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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 are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.cert.cmp;

import java.math.BigInteger;

import org.bouncycastle.asn1.cmp.CMPCertificate;
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
    {
        return isVerified(new CMPCertificate(certHolder.toASN1Structure()), certHolder.getSignatureAlgorithm(),
            digesterProvider);
    }

    public boolean isVerified(CMPCertificate cmpCert, AlgorithmIdentifier signatureAlgorithm,
        DigestCalculatorProvider digesterProvider)
        throws CMPException
    {
        byte[] certHash = CMPUtil.calculateCertHash(cmpCert, signatureAlgorithm, digesterProvider, digestAlgFinder);

        return Arrays.constantTimeAreEqual(certStatus.getCertHash().getOctets(), certHash);
    }
}