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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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];
    }
}