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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.io.Writer;

import org.bouncycastle.openssl.PEMEncryptor;
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 based on JCA/JCE classes.
 */
public class JcaPEMWriter
    extends PemWriter
{
    /**
     * Base constructor.
     *
     * @param out output stream to use.
     */
    public JcaPEMWriter(Writer out)
    {
        super(out);
    }

    /**
     * @throws java.io.IOException
     */
    public void writeObject(
        Object  obj)
        throws IOException
    {
        writeObject(obj, null);
    }

    /**
     * @param obj
     * @param encryptor
     * @throws java.io.IOException
     */
    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);
    }
}