PEMUtils.java

/*
 * Copyright (c) Members of the EGEE Collaboration. 2006-2010.
 * See http://www.eu-egee.org/partners/ for details on the copyright holders.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * $Id$
 */
package org.glite.authz.common.security;

import java.io.IOException;
import java.io.StringWriter;
import java.security.cert.X509Certificate;
import java.util.List;

import org.bouncycastle.openssl.PEMWriter;

/** 
 * PEM utility methods.
 *
 * @author Valery Tschopp <tschopp@switch.ch>
 */
public class PEMUtils {

    /**
     * Writes the certificates into a PEM encoded string.
     * 
     * @param certs
     *            List of certificates to PEM encode
     * @return the String containing the PEM encoded certificates
     * @throws IOException
     *             if an error occurs while writing a certificate
     */
    public static String certificatesToPEMString(List<X509Certificate> certs)
            throws IOException {
        StringWriter stringWriter= new StringWriter();
        PEMWriter writer= new PEMWriter(stringWriter);
        for (X509Certificate cert : certs) {
            writer.writeObject(cert);
        }
        try {
            writer.close();
        } catch (Exception e) {
            // ignored
        }
        return stringWriter.toString();
    }

    /** Prevents instantiation */
    private PEMUtils() {
    }
    
    
}