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The Bouncy Castle Java S/MIME APIs for handling S/MIME protocols. This jar contains S/MIME 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. The JavaMail API and the Java activation framework will also be needed.

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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;
}