/* 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.springframework.security.authentication.dao;

import org.springframework.security.core.userdetails.UserDetails;

/**
 * Provides alternative sources of the salt to use for encoding passwords.
 *
 * @author Ben Alex
 */
public interface SaltSource {
	// ~ Methods
	// ========================================================================================================

	/**
	 * Returns the salt to use for the indicated user.
	 *
	 * @param user from the <code>AuthenticationDao</code>
	 *
	 * @return the salt to use for this <code>UserDetails</code>
	 */
	Object getSalt(UserDetails user);
}
