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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.operator;

import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.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;
}