| /* |
| * Copyright 1999-2004 The Apache Software Foundation. |
| * |
| * 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.apache.xml.security.algorithms; |
| |
| |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| |
| import org.apache.xml.security.Init; |
| import org.apache.xml.security.utils.XMLUtils; |
| import org.w3c.dom.Element; |
| |
| |
| |
| /** |
| * This class maps algorithm identifier URIs to JAVA JCE class names. |
| * |
| * @author $Author$ |
| */ |
| public class JCEMapper { |
| |
| /** {@link org.apache.commons.logging} logging facility */ |
| static org.apache.commons.logging.Log log = |
| org.apache.commons.logging.LogFactory.getLog(JCEMapper.class.getName()); |
| |
| |
| |
| private static Map uriToJCEName = new HashMap(); |
| |
| private static Map algorithmsMap = new HashMap(); |
| |
| private static String providerName = null; |
| /** |
| * Method init |
| * |
| * @param mappingElement |
| * @throws Exception |
| */ |
| public static void init(Element mappingElement) throws Exception { |
| |
| loadAlgorithms((Element)mappingElement.getElementsByTagName("Algorithms").item(0)); |
| } |
| |
| static void loadAlgorithms( Element algorithmsEl) { |
| Element[] algorithms = XMLUtils.selectNodes(algorithmsEl.getFirstChild(),Init.CONF_NS,"Algorithm"); |
| for (int i = 0 ;i < algorithms.length ;i ++) { |
| Element el = algorithms[i]; |
| String id = el.getAttribute("URI"); |
| String jceName = el.getAttribute("JCEName"); |
| uriToJCEName.put(id, jceName); |
| algorithmsMap.put(id, new Algorithm(el)); |
| } |
| } |
| |
| static Algorithm getAlgorithmMapping(String algoURI) { |
| return ((Algorithm)algorithmsMap.get(algoURI)); |
| } |
| |
| /** |
| * Method translateURItoJCEID |
| * |
| * @param AlgorithmURI |
| * @return the JCE standard name corresponding to the given URI |
| * |
| */ |
| public static String translateURItoJCEID(String AlgorithmURI) { |
| if (log.isDebugEnabled()) |
| log.debug("Request for URI " + AlgorithmURI); |
| |
| String jceName = (String) uriToJCEName.get(AlgorithmURI); |
| return jceName; |
| } |
| |
| /** |
| * Method getAlgorithmClassFromURI |
| * NOTE(Raul Benito) It seems a buggy function the loop doesn't do |
| * anything?? |
| * @param AlgorithmURI |
| * @return the class name that implements this algorithm |
| * |
| */ |
| public static String getAlgorithmClassFromURI(String AlgorithmURI) { |
| if (log.isDebugEnabled()) |
| log.debug("Request for URI " + AlgorithmURI); |
| |
| return ((Algorithm) algorithmsMap.get(AlgorithmURI)).algorithmClass; |
| } |
| |
| /** |
| * Returns the keylength in bit for a particular algorithm. |
| * |
| * @param AlgorithmURI |
| * @return The length of the key used in the alogrithm |
| */ |
| public static int getKeyLengthFromURI(String AlgorithmURI) { |
| return Integer.parseInt(((Algorithm) algorithmsMap.get(AlgorithmURI)).keyLength); |
| } |
| |
| /** |
| * Method getJCEKeyAlgorithmFromURI |
| * |
| * @param AlgorithmURI |
| * @return The KeyAlgorithm for the given URI. |
| * |
| */ |
| public static String getJCEKeyAlgorithmFromURI(String AlgorithmURI) { |
| |
| return ((Algorithm) algorithmsMap.get(AlgorithmURI)).requiredKey; |
| |
| } |
| |
| /** |
| * Gets the default Provider for obtaining the security algorithms |
| * @return the default providerId. |
| */ |
| public static String getProviderId() { |
| return providerName; |
| } |
| |
| /** |
| * Sets the default Provider for obtaining the security algorithms |
| * @param provider the default providerId. |
| */ |
| public static void setProviderId(String provider) { |
| providerName=provider; |
| } |
| |
| /** |
| * Represents the Algorithm xml element |
| */ |
| public static class Algorithm { |
| String algorithmClass; |
| String keyLength; |
| String requiredKey; |
| /** |
| * Gets data from element |
| * @param el |
| */ |
| public Algorithm(Element el) { |
| algorithmClass=el.getAttribute("AlgorithmClass"); |
| keyLength=el.getAttribute("KeyLength"); |
| requiredKey=el.getAttribute("RequiredKey"); |
| } |
| } |
| } |