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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.cert.jcajce;

import java.io.IOException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.spongycastle.cert.X509CertificateHolder;
import org.spongycastle.util.CollectionStore;

/**
 * Class for storing Certificates for later lookup.
 * 
 * The class will convert X509Certificate objects into X509CertificateHolder objects.
 * 
 */
public class JcaCertStore
    extends CollectionStore
{
    /**
     * Basic constructor.
     *
     * @param collection - initial contents for the store, this is copied.
     */
    public JcaCertStore(Collection collection)
        throws CertificateEncodingException
    {
        super(convertCerts(collection));
    }

    private static Collection convertCerts(Collection collection)
        throws CertificateEncodingException
    {
        List list = new ArrayList(collection.size());

        for (Iterator it = collection.iterator(); it.hasNext();)
        {
            Object o = it.next();

            if (o instanceof X509Certificate)
            {
                X509Certificate cert = (X509Certificate)o;

                try
                {
                    list.add(new X509CertificateHolder(cert.getEncoded()));
                }
                catch (IOException e)
                {
                    throw new CertificateEncodingException("unable to read encoding: " + e.getMessage());
                }
            }
            else
            {
                list.add((X509CertificateHolder)o);
            }
        }

        return list;
    }
}