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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 1.8 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.

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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.util.Iterable;

public class SignerInformationStore
    implements Iterable
{
    private List all = new ArrayList();
    private Map table = new HashMap();

    /**
     * Create a store containing a single SignerInformation object.
     *
     * @param signerInfo the signer information to contain.
     */
    public SignerInformationStore(
        SignerInformation  signerInfo)
    {
        this.all = new ArrayList(1);
        this.all.add(signerInfo);

        SignerId sid = signerInfo.getSID();

        table.put(sid, all);
    }

    /**
     * Create a store containing a collection of SignerInformation objects.
     *
     * @param signerInfos a collection signer information objects to contain.
     */
    public SignerInformationStore(
        Collection  signerInfos)
    {
        Iterator    it = signerInfos.iterator();

        while (it.hasNext())
        {
            SignerInformation   signer = (SignerInformation)it.next();
            SignerId            sid = signer.getSID();

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

            list.add(signer);
        }

        this.all = new ArrayList(signerInfos);
    }

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

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

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

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

    /**
     * Return possible empty collection with signers matching the passed in SignerId
     * 
     * @param selector a signer id to select against.
     * @return a collection of SignerInformation objects.
     */
    public Collection getSigners(
        SignerId selector)
    {
        if (selector.getIssuer() != null && selector.getSubjectKeyIdentifier() != null)
        {
            List results = new ArrayList();

            Collection match1 = getSigners(new SignerId(selector.getIssuer(), selector.getSerialNumber()));

            if (match1 != null)
            {
                results.addAll(match1);
            }

            Collection match2 = getSigners(new SignerId(selector.getSubjectKeyIdentifier()));

            if (match2 != null)
            {
                results.addAll(match2);
            }

            return results;
        }
        else
        {
            List list = (ArrayList)table.get(selector);

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

    /**
     * Support method for Iterable where available.
     */
    public Iterator iterator()
    {
        return getSigners().iterator();
    }
}