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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());
        }
    }

    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];
    }
}