Java Key Create getKeyFactory(final String algorithm)

Description

get Key Factory

License

Open Source License

Declaration

private static KeyFactory getKeyFactory(final String algorithm) throws InvalidKeySpecException 

Method Source Code

//package com.java2s;
/*//from w  ww  .  j av a 2 s . c o m
 *
 * This file is part of the XiPKI project.
 * Copyright (c) 2014 - 2015 Lijun Liao
 * Author: Lijun Liao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * THE AUTHOR LIJUN LIAO. LIJUN LIAO DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the XiPKI software without
 * disclosing the source code of your own applications.
 *
 * For more information, please contact Lijun Liao at this
 * address: lijun.liao@gmail.com
 */

import java.security.KeyFactory;

import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;

import java.security.spec.InvalidKeySpecException;

import java.util.HashMap;
import java.util.Map;

public class Main {
    private static final Map<String, KeyFactory> keyFactories = new HashMap<>();

    private static KeyFactory getKeyFactory(final String algorithm) throws InvalidKeySpecException {
        synchronized (keyFactories) {
            KeyFactory kf = keyFactories.get(algorithm);
            if (kf != null) {
                return kf;
            }

            try {
                kf = KeyFactory.getInstance(algorithm, "BC");
            } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
                throw new InvalidKeySpecException(
                        "could not find KeyFactory for " + algorithm + ": " + e.getMessage());
            }
            keyFactories.put(algorithm, kf);
            return kf;
        }
    }
}

Related

1. getKeyExchangeCipher()
2. getKeyFactory()
3. getKeyFactory()
4. getKeyFactory()
5. getKeyFactory(final String algorithm)
6. getKeyFactory(String keyType)
7. getKeyFromFile(String _sFilename, String _sPassword)
8. getKeyFromFile(String keyFile)
9. getKeyGenerator(String algorithm)