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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.pkix.jcajce;

import org.bouncycastle.asn1.x509.ReasonFlags;

/**
 * This class helps to handle CRL revocation reasons mask. Each CRL handles a
 * certain set of revocation reasons.
 */
class ReasonsMask
{
    private int _reasons;

    /**
     * Constructs are reason mask with the reasons.
     * 
     * @param reasons The reasons.
     */
    ReasonsMask(ReasonFlags reasons)
    {
        _reasons = reasons.intValue();
    }

    private ReasonsMask(int reasons)
    {
        _reasons = reasons;
    }

    /**
     * A reason mask with no reason.
     * 
     */
    ReasonsMask()
    {
        this(0);
    }

    /**
     * A mask with all revocation reasons.
     */
    static final ReasonsMask allReasons = new ReasonsMask(ReasonFlags.aACompromise
            | ReasonFlags.affiliationChanged | ReasonFlags.cACompromise
            | ReasonFlags.certificateHold | ReasonFlags.cessationOfOperation
            | ReasonFlags.keyCompromise | ReasonFlags.privilegeWithdrawn
            | ReasonFlags.unused | ReasonFlags.superseded);

    /**
     * Adds all reasons from the reasons mask to this mask.
     * 
     * @param mask The reasons mask to add.
     */
    void addReasons(ReasonsMask mask)
    {
        _reasons = _reasons | mask.getReasons();
    }

    /**
     * Returns true if this reasons mask contains all possible
     * reasons.
     * 
     * @return true if this reasons mask contains all possible
     *         reasons.
     */
    boolean isAllReasons()
    {
        return _reasons == allReasons._reasons ? true : false;
    }

    /**
     * Intersects this mask with the given reasons mask.
     * 
     * @param mask The mask to intersect with.
     * @return The intersection of this and teh given mask.
     */
    ReasonsMask intersect(ReasonsMask mask)
    {
        ReasonsMask _mask = new ReasonsMask();
        _mask.addReasons(new ReasonsMask(_reasons & mask.getReasons()));
        return _mask;
    }

    /**
     * Returns true if the passed reasons mask has new reasons.
     * 
     * @param mask The reasons mask which should be tested for new reasons.
     * @return true if the passed reasons mask has new reasons.
     */
    boolean hasNewReasons(ReasonsMask mask)
    {
        return ((_reasons | mask.getReasons() ^ _reasons) != 0);
    }

    /**
     * Returns the reasons in this mask.
     * 
     * @return Returns the reasons.
     */
    int getReasons()
    {
        return _reasons;
    }
}