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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.openssl.jcajce;

import java.io.IOException;
import java.security.Key;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.CRLException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509CRL;
import java.security.cert.X509Certificate;

import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.cert.jcajce.JcaX509CRLHolder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;
import org.bouncycastle.openssl.MiscPEMGenerator;
import org.bouncycastle.openssl.PEMEncryptor;

/**
 * PEM generator for the original set of PEM objects used in Open SSL.
 */
public class JcaMiscPEMGenerator
    extends MiscPEMGenerator
{
    private Object obj;
    private String algorithm;
    private char[] password;
    private SecureRandom random;
    private Provider provider;

    public JcaMiscPEMGenerator(Object o)
        throws IOException
    {
        super(convertObject(o));
    }

    public JcaMiscPEMGenerator(Object o, PEMEncryptor encryptor)
        throws IOException
    {
        super(convertObject(o), encryptor);
    }

    private static Object convertObject(Object o)
        throws IOException
    {
        if (o instanceof X509Certificate)
        {
            try
            {
                return new JcaX509CertificateHolder((X509Certificate)o);
            }
            catch (CertificateEncodingException e)
            {
                throw new IllegalArgumentException("Cannot encode object: " + e.toString());
            }
        }
        else if (o instanceof X509CRL)
        {
            try
            {
                return new JcaX509CRLHolder((X509CRL)o);
            }
            catch (CRLException e)
            {
                throw new IllegalArgumentException("Cannot encode object: " + e.toString());
            }
        }
        else if (o instanceof KeyPair)
        {
            return convertObject(((KeyPair)o).getPrivate());
        }
        else if (o instanceof PrivateKey)
        {
            return PrivateKeyInfo.getInstance(((Key)o).getEncoded());
        }
        else if (o instanceof PublicKey)
        {
            return SubjectPublicKeyInfo.getInstance(((PublicKey)o).getEncoded());
        }

        return o;
    }
}