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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.operator;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.X509CertificateHolder;

/**
 * General interface for providers of ContentVerifier objects.
 */
public interface ContentVerifierProvider
{
    /**
     * Return whether or not this verifier has a certificate associated with it.
     *
     * @return true if there is an associated certificate, false otherwise.
     */
    boolean hasAssociatedCertificate();

    /**
     * Return the associated certificate if there is one.
     *
     * @return a holder containing the associated certificate if there is one, null if there is not.
     */
    X509CertificateHolder getAssociatedCertificate();

    /**
     * Return a ContentVerifier that matches the passed in algorithm identifier,
     *
     * @param verifierAlgorithmIdentifier the algorithm and parameters required.
     * @return a matching ContentVerifier
     * @throws OperatorCreationException if the required ContentVerifier cannot be created.
     */
    ContentVerifier get(AlgorithmIdentifier verifierAlgorithmIdentifier)
        throws OperatorCreationException;
}