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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.cms;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.bouncycastle.asn1.x500.X500Name;

public class RecipientInformationStore
{
    private final List all; //ArrayList[RecipientInformation]
    private final Map table = new HashMap(); // HashMap[RecipientID, ArrayList[RecipientInformation]]

    public RecipientInformationStore(
        Collection recipientInfos)
    {
        Iterator it = recipientInfos.iterator();

        while (it.hasNext())
        {
            RecipientInformation recipientInformation = (RecipientInformation)it.next();
            RecipientId rid = recipientInformation.getRID();

            List list = (ArrayList)table.get(rid);
            if (list == null)
            {
                list = new ArrayList(1);
                table.put(rid, list);
            }

            list.add(recipientInformation);
        }

        this.all = new ArrayList(recipientInfos);
    }

    /**
     * Return the first RecipientInformation object that matches the
     * passed in selector. Null if there are no matches.
     *
     * @param selector to identify a recipient
     * @return a single RecipientInformation object. Null if none matches.
     */
    public RecipientInformation get(
        RecipientId selector)
    {
        Collection list = getRecipients(selector);

        return list.size() == 0 ? null : (RecipientInformation)list.iterator().next();
    }

    /**
     * Return the number of recipients in the collection.
     *
     * @return number of recipients identified.
     */
    public int size()
    {
        return all.size();
    }

    /**
     * Return all recipients in the collection
     *
     * @return a collection of recipients.
     */
    public Collection getRecipients()
    {
        return new ArrayList(all);
    }

    /**
     * Return possible empty collection with recipients matching the passed in RecipientId
     *
     * @param selector a recipient id to select against.
     * @return a collection of RecipientInformation objects.
     */
    public Collection getRecipients(
        RecipientId selector)
    {
        if (selector instanceof KeyTransRecipientId)
        {
            KeyTransRecipientId keyTrans = (KeyTransRecipientId)selector;

            X500Name issuer = keyTrans.getIssuer();
            byte[] subjectKeyId = keyTrans.getSubjectKeyIdentifier();

            if (issuer != null && subjectKeyId != null)
            {
                List results = new ArrayList();

                Collection match1 = getRecipients(new KeyTransRecipientId(issuer, keyTrans.getSerialNumber()));
                if (match1 != null)
                {
                    results.addAll(match1);
                }

                Collection match2 = getRecipients(new KeyTransRecipientId(subjectKeyId));
                if (match2 != null)
                {
                    results.addAll(match2);
                }

                return results;
            }
        }

        List list = (ArrayList)table.get(selector);

        return list == null ? new ArrayList() : new ArrayList(list);
    }
}