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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.cms;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.operator.ContentVerifier;
import org.bouncycastle.operator.ContentVerifierProvider;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.SignatureAlgorithmIdentifierFinder;

public class SignerInformationVerifier
{
    private ContentVerifierProvider verifierProvider;
    private DigestCalculatorProvider digestProvider;
    private SignatureAlgorithmIdentifierFinder sigAlgorithmFinder;
    private CMSSignatureAlgorithmNameGenerator sigNameGenerator;

    public SignerInformationVerifier(CMSSignatureAlgorithmNameGenerator sigNameGenerator, SignatureAlgorithmIdentifierFinder sigAlgorithmFinder, ContentVerifierProvider verifierProvider, DigestCalculatorProvider digestProvider)
    {
        this.sigNameGenerator = sigNameGenerator;
        this.sigAlgorithmFinder = sigAlgorithmFinder;
        this.verifierProvider = verifierProvider;
        this.digestProvider = digestProvider;
    }

    public boolean hasAssociatedCertificate()
    {
        return verifierProvider.hasAssociatedCertificate();
    }

    public X509CertificateHolder getAssociatedCertificate()
    {
        return verifierProvider.getAssociatedCertificate();
    }

    public ContentVerifier getContentVerifier(AlgorithmIdentifier signingAlgorithm, AlgorithmIdentifier digestAlgorithm)
        throws OperatorCreationException
    {
        String              signatureName = sigNameGenerator.getSignatureName(digestAlgorithm, signingAlgorithm);
        AlgorithmIdentifier baseAlgID = sigAlgorithmFinder.find(signatureName);

        return verifierProvider.get(new AlgorithmIdentifier(baseAlgID.getAlgorithm(), signingAlgorithm.getParameters()));
    }

    public DigestCalculator getDigestCalculator(AlgorithmIdentifier algorithmIdentifier)
        throws OperatorCreationException
    {
        return digestProvider.get(algorithmIdentifier);
    }
}