/*
 * Copyright (C) 2011 Citrix Systems, Inc.  All rights reserved.
 * 
 * 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 com.cloud.bridge.util;

import org.apache.log4j.Logger;

import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import javax.security.auth.x500.X500Principal;
import java.math.BigInteger;


public class AuthenticationUtils {
    protected final static Logger logger = Logger.getLogger(AuthenticationUtils.class);

	public AuthenticationUtils() {
	}

	/**
	 * The combination of the Issuer and the serial number of a X509 certificate
	 * must be globally unique.  The Issuer can be described by its Distinguished Name (DN).  
	 * The uniqueId is constructed by appending a ", serial=" onto the end of the Issuer's 
	 * DN (thus keeping the DN format).
	 * 
	 * @param cert
	 */
	public static String X509CertUniqueId( Certificate cert ) {
		X509Certificate userCert = (X509Certificate)cert;
        X500Principal issuer = userCert.getIssuerX500Principal();
        BigInteger serialNumber = userCert.getSerialNumber();
        return new String( issuer.toString() + ", serial=" + serialNumber );
	}
}