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     *      http://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    package org.apache.camel.component.gae.auth;
018    
019    import java.security.PrivateKey;
020    
021    /**
022     * Interface used by {@link GAuthComponent} for loading private keys. The private
023     * key is needed for RSA-SHA1 signatures.
024     */
025    public interface GAuthKeyLoader {
026    
027        /**
028         * Loads a private key.
029         * 
030         * @return the loaded private key.
031         * @throws Exception
032         *             if key loading failed.
033         */
034        PrivateKey loadPrivateKey() throws Exception;
035    
036    }