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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.

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package org.bouncycastle.x509;

import java.security.cert.CertPath;
import java.security.cert.CertPathValidatorException;
import java.util.Collection;
import java.util.Set;

public abstract class PKIXAttrCertChecker
    implements Cloneable
{

    /**
     * Returns an immutable Set of X.509 attribute certificate
     * extensions that this PKIXAttrCertChecker supports or
     * null if no extensions are supported.
     * 
     * Each element of the set is a String representing the
     * Object Identifier (OID) of the X.509 extension that is supported.
     * 
     * All X.509 attribute certificate extensions that a
     * PKIXAttrCertChecker might possibly be able to process
     * should be included in the set.
     * 
     * @return an immutable Set of X.509 extension OIDs (in
     *         String format) supported by this
     *         PKIXAttrCertChecker, or null if no
     *         extensions are supported
     */
    public abstract Set getSupportedExtensions();

    /**
     * Performs checks on the specified attribute certificate. Every handled
     * extension is rmeoved from the unresolvedCritExts
     * collection.
     * 
     * @param attrCert The attribute certificate to be checked.
     * @param certPath The certificate path which belongs to the attribute
     *            certificate issuer public key certificate.
     * @param holderCertPath The certificate path which belongs to the holder
     *            certificate.
     * @param unresolvedCritExts a Collection of OID strings
     *            representing the current set of unresolved critical extensions
     * @throws CertPathValidatorException if the specified attribute certificate
     *             does not pass the check.
     */
    public abstract void check(X509AttributeCertificate attrCert, CertPath certPath,
                                 CertPath holderCertPath, Collection unresolvedCritExts)
        throws CertPathValidatorException;

    /**
     * Returns a clone of this object.
     * 
     * @return a copy of this PKIXAttrCertChecker
     */
    public abstract Object clone();
}