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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

There is a newer version: 1.54.0.0

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package org.spongycastle.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;

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

    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);
        }
    }
}