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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.pkix.jcajce;

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

import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;
import org.bouncycastle.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());
        }
    }

    /**
     * Base constructor - a private key and its associated certificate chain. The chain
     * should be ordered so that certs[0] is the matching public key for privKey.
     *
     * @param privKey the private key.
     * @param certs the public key certificates identifying it.
     */
    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);
    }

    /**
     * Base constructor - a private key and its associated public key certificate.
     *
     * @param privKey the private key.
     * @param cert privKey's matching public key certificate.
     */
    public JcaPKIXIdentity(PrivateKey privKey, X509Certificate cert)
    {
        this(privKey, new X509Certificate[] { cert });
    }

    /**
     * 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];
    }

    /**
     * Return the certificate chain associated with the private key.
     *
     * @return the certificate chain.
     */
    public X509Certificate[] getX509CertificateChain()
    {
        X509Certificate[] rv = new X509Certificate[certs.length];

        System.arraycopy(certs, 0, rv, 0, rv.length);

        return rv;
    }
}