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/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.acegisecurity.providers.encoding;

/**
 * SHA implementation of PasswordEncoder.
 * If a null password is presented, it will be treated as an empty String ("")
 * password.
 * As SHA is a one-way hash, the salt can contain any characters.
 *
 * The default strength for the SHA encoding is SHA-1. If you wish to use higher strengths use the argumented constructor.
 * {@link #ShaPasswordEncoder(int strength)}
 * 

 * The applicationContext example... 

 * <bean id="passwordEncoder" class="org.acegisecurity.providers.encoding.ShaPasswordEncoder">

 *   <constructor-arg value="256"/>

 * </bean>
 *
 *
 * @author Ray Krueger
 * @author colin sampaleanu
 * @author Ben Alex
 * @version $Id: ShaPasswordEncoder.java 1527 2006-05-31 03:03:18Z raykrueger $
 */
public class ShaPasswordEncoder extends MessageDigestPasswordEncoder {

    /**
     * Initializes the ShaPasswordEncoder for SHA-1 strength
     */
    public ShaPasswordEncoder() {
        this(1);
    }

    /**
     * Initialize the ShaPasswordEncoder with a given SHA stength as supported by the JVM
     * EX: ShaPasswordEncoder encoder = new ShaPasswordEncoder(256); initializes with SHA-256
     *
     * @param strength EX: 1, 256, 384, 512
     */
    public ShaPasswordEncoder(int strength) {
        super("SHA-" + strength);
    }
}