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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.

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package org.spongycastle.pkix.jcajce;

import java.security.PrivateKey;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;

import org.spongycastle.asn1.pkcs.PrivateKeyInfo;
import org.spongycastle.cert.X509CertificateHolder;
import org.spongycastle.cert.jcajce.JcaX509CertificateHolder;
import org.spongycastle.pkix.PKIXIdentity;

/**
 * Holder class for public/private key based identity information.
 */
public class JcaPKIXIdentity
    extends PKIXIdentity
{
    private final PrivateKey privKey;
    private final X509Certificate[] certs;

    private static PrivateKeyInfo getPrivateKeyInfo(PrivateKey privateKey)
    {
         try
         {
             return PrivateKeyInfo.getInstance(privateKey.getEncoded());
         }
         catch (Exception e)             // for a HSM getEncoded() may do anything...
         {
             return null;
         }
    }

    private static X509CertificateHolder[] getCertificates(X509Certificate[] certs)
    {
        X509CertificateHolder[] certHldrs = new X509CertificateHolder[certs.length];

        try
        {
            for (int i = 0; i != certHldrs.length; i++)
            {
                certHldrs[i] = new JcaX509CertificateHolder(certs[i]);
            }

            return certHldrs;
        }
        catch (CertificateEncodingException e)
        {
            throw new IllegalArgumentException("Unable to process certificates: " + e.getMessage());
        }
    }

    public JcaPKIXIdentity(PrivateKey privKey, X509Certificate[] certs)
    {
        super(getPrivateKeyInfo(privKey), getCertificates(certs));

        this.privKey = privKey;
        this.certs = new X509Certificate[certs.length];

        System.arraycopy(certs, 0, this.certs, 0, certs.length);
    }

    /**
     * Return the private key for this identity.
     *
     * @return the identity's private key.
     */
    public PrivateKey getPrivateKey()
    {
        return privKey;
    }

    /**
     * Return the certificate associated with the private key.
     *
     * @return the primary certificate.
     */
    public X509Certificate getX509Certificate()
    {
        return certs[0];
    }
}