    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *   https://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.net.util;
    019
    020import java.io.IOException;
    021import java.security.GeneralSecurityException;
    022
    023import javax.net.ssl.KeyManager;
    024import javax.net.ssl.SSLContext;
    025import javax.net.ssl.TrustManager;
    026
    027/**
    028 * General utilities for SSLContext.
    029 *
    030 * @since 3.0
    031 */
    032public class SSLContextUtils {
    033
    034    /**
    035     * Create and initialize an SSLContext.
    036     *
    037     * @param protocol     the protocol used to instantiate the context
    038     * @param keyManager   the key manager, may be {@code null}
    039     * @param trustManager the trust manager, may be {@code null}
    040     * @return the initialized context.
    041     * @throws IOException this is used to wrap any {@link GeneralSecurityException} that occurs
    042     */
    043    public static SSLContext createSSLContext(final String protocol, final KeyManager keyManager, final TrustManager trustManager) throws IOException {
    044        return createSSLContext(protocol, keyManager == null ? null : new KeyManager[] { keyManager },
    045                trustManager == null ? null : new TrustManager[] { trustManager });
    046    }
    047
    048    /**
    049     * Create and initialize an SSLContext.
    050     *
    051     * @param protocol      the protocol used to instantiate the context
    052     * @param keyManagers   the array of key managers, may be {@code null} but array entries must not be {@code null}
    053     * @param trustManagers the array of trust managers, may be {@code null} but array entries must not be {@code null}
    054     * @return the initialized context.
    055     * @throws IOException this is used to wrap any {@link GeneralSecurityException} that occurs
    056     */
    057    public static SSLContext createSSLContext(final String protocol, final KeyManager[] keyManagers, final TrustManager[] trustManagers) throws IOException {
    058        final SSLContext ctx;
    059        try {
    060            ctx = SSLContext.getInstance(protocol);
    061            ctx.init(keyManagers, trustManagers, /* SecureRandom */ null);
    062        } catch (final GeneralSecurityException e) {
    063            throw new IOException("Could not initialize SSL context", e);
    064        }
    065        return ctx;
    066    }
    067
    068    private SSLContextUtils() {
    069        // Not instantiable
    070    }
    071}