jdkkeyfactoryrsaonly.java

基于JXTA开发平台的下载软件开发源代码

/*
 * Created on 08-Jun-2004
 * Created by Paul Gardner
 * Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 * 
 * AELITIS, SAS au capital de 46,603.30 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 *
 */

package org.bouncycastle.jce.provider;

/**
 * @author parg
 *
 */

import java.security.PublicKey;
import org.bouncycastle.asn1.x509.*;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;

public class 
JDKKeyFactoryRSAOnly 
{
    static PublicKey createPublicKeyFromPublicKeyInfo(
        SubjectPublicKeyInfo         info)
    {
        AlgorithmIdentifier     algId = info.getAlgorithmId();
        
        if (algId.getObjectId().equals(PKCSObjectIdentifiers.rsaEncryption)
        	|| algId.getObjectId().equals(X509ObjectIdentifiers.id_ea_rsa))
        {
              return new JCERSAPublicKey(info);
        }
        else
        {
            throw new RuntimeException("algorithm identifier in key not recognised");
        }
    }
}