MessageDigestFactory.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openspcoop2.utils.digest;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.Security;

/**
 * MessageDigestFactory
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class MessageDigestFactory {

    private static boolean useBouncyCastleProvider = false;
    public static boolean isUseBouncyCastleProvider() {
        return useBouncyCastleProvider;
    }
    public static void setUseBouncyCastleProvider(boolean useBouncyCastleProvider) {
        MessageDigestFactory.useBouncyCastleProvider = useBouncyCastleProvider;
    }
    
    private static Provider provider = null;
    private static synchronized Provider _getProvider() {
        if ( provider == null )
            provider = Security.getProvider(org.bouncycastle.jce.provider.BouncyCastleProvider.PROVIDER_NAME);
        return provider;
    }
    private static Provider getProvider() {
        if(!useBouncyCastleProvider) {
            return null;
        }
        if ( provider == null )
            return _getProvider();
        return provider;
    }
    
    public static MessageDigest getMessageDigest(String algoritmo) throws NoSuchAlgorithmException {
        MessageDigest digest = null;
        if(useBouncyCastleProvider) {
            digest = MessageDigest.getInstance(algoritmo, getProvider());
        }
        else {
            digest = MessageDigest.getInstance(algoritmo);
        }
        return digest;
    }   
    
}