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Java APIs to validate and request VOMS attribute certificates

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/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare, 2006-2012.
 *
 * 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.
 */
package org.italiangrid.voms.credential;

import java.io.IOException;
import java.io.OutputStream;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import eu.emi.security.authn.x509.X509Credential;
import eu.emi.security.authn.x509.impl.CertificateUtils;
import eu.emi.security.authn.x509.impl.CertificateUtils.Encoding;

/**
 * An utility class for handling credentials
 * 
 * @author Daniele Andreotti
 * @author Andrea Ceccanti
 * 
 */
public class CredentialsUtils {
	
	/**
	 * Saves user credentials as a plain text PEM data. 

	 * Writes the user certificate chain first, then the user key.
	 * 
	 * 
	 * @throws IOException
	 * @throws NoSuchAlgorithmException
	 * @throws IllegalArgumentException
	 * @throws KeyStoreException
	 * @throws UnrecoverableKeyException
	 * @throws NoSuchProviderException
	 * @throws CertificateException
	 */
	public static void saveCredentials(OutputStream os, X509Credential uc) throws UnrecoverableKeyException,
			KeyStoreException, IllegalArgumentException, NoSuchAlgorithmException, IOException, NoSuchProviderException,
			CertificateException {
		
		X509Certificate[] chain = uc.getCertificateChain();
		
		for (X509Certificate c: chain)
			CertificateUtils.saveCertificate(os, c, Encoding.PEM);
		
		PrivateKey key = uc.getKey();
		
		if (key != null)
			CertificateUtils.savePrivateKey(os, key, Encoding.PEM, null, null);
		
		os.flush();
	}
}