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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 1.4. 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;

import java.io.IOException;
import java.io.Writer;
import java.security.SecureRandom;

import org.bouncycastle.openssl.jcajce.JcaMiscPEMGenerator;
import org.bouncycastle.openssl.jcajce.JcePEMEncryptorBuilder;
import org.bouncycastle.util.io.pem.PemGenerationException;
import org.bouncycastle.util.io.pem.PemObjectGenerator;
import org.bouncycastle.util.io.pem.PemWriter;

/**
 * General purpose writer for OpenSSL PEM objects.
 */
public class PEMWriter
    extends PemWriter
{
    private String provider;

    /**
     * Base constructor.
     * 
     * @param out output stream to use.
     */
    public PEMWriter(Writer out)
    {
        this(out, "BC");
    }

    /**
     * @deprecated use constructor that just takes out, and writeObject(PEMEncryptor)
     * @param out
     * @param provider
     */
    public PEMWriter(
        Writer  out,
        String  provider)
    {
        super(out);

        this.provider = provider;
    }

    public void writeObject(
            Object  obj)
            throws IOException
    {
        writeObject(obj, null);
    }

    public void writeObject(
        Object  obj,
        PEMEncryptor encryptor)
        throws IOException
    {
        try
        {
            super.writeObject(new JcaMiscPEMGenerator(obj, encryptor));
        }
        catch (PemGenerationException e)
        {
            if (e.getCause() instanceof IOException)
            {
                throw (IOException)e.getCause();
            }

            throw e;
        }
    }

    public void writeObject(
        PemObjectGenerator obj)
        throws IOException
    {
        super.writeObject(obj);
    }

    /**
     * @deprecated use writeObject(obj, PEMEncryptor)
     */
    public void writeObject(
        Object       obj,
        String       algorithm,
        char[]       password,
        SecureRandom random)
        throws IOException
    {
        this.writeObject(obj, new JcePEMEncryptorBuilder(algorithm).setSecureRandom(random).setProvider(provider).build(password));
    }
}