| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.harmony.security.fortress; |
| |
| import java.security.Provider; |
| import java.security.Security; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Map; |
| |
| |
| /** |
| * This class contains information about all registered providers and preferred |
| * implementations for all "serviceName.algName". |
| */ |
| public class Services { |
| |
| /** |
| * The HashMap that contains information about preferred implementations for |
| * all serviceName.algName in the registered providers. |
| * Set the initial size to 600 so we don't grow to 1024 by default because |
| * initialization adds a few entries more than the growth threshold. |
| */ |
| private static final Map<String, Provider.Service> services |
| = new HashMap<String, Provider.Service>(600); |
| |
| /** |
| * Save default SecureRandom service as well. |
| * Avoids similar provider/services iteration in SecureRandom constructor. |
| */ |
| private static Provider.Service cachedSecureRandomService; |
| |
| /** |
| * Need refresh flag. |
| */ |
| private static boolean needRefresh; |
| |
| /** |
| * The cacheVersion is changed on every update of service |
| * information. It is used by external callers to validate their |
| * own caches of Service information. |
| */ |
| private static int cacheVersion = 1; |
| |
| /** |
| * Registered providers. |
| */ |
| private static final List<Provider> providers = new ArrayList<Provider>(20); |
| |
| /** |
| * Hash for quick provider access by name. |
| */ |
| private static final Map<String, Provider> providersNames = new HashMap<String, Provider>(20); |
| static { |
| String providerClassName = null; |
| int i = 1; |
| ClassLoader cl = ClassLoader.getSystemClassLoader(); |
| |
| while ((providerClassName = Security.getProperty("security.provider." + i++)) != null) { |
| try { |
| Class providerClass = Class.forName(providerClassName.trim(), true, cl); |
| Provider p = (Provider) providerClass.newInstance(); |
| providers.add(p); |
| providersNames.put(p.getName(), p); |
| initServiceInfo(p); |
| } catch (ClassNotFoundException ignored) { |
| } catch (IllegalAccessException ignored) { |
| } catch (InstantiationException ignored) { |
| } |
| } |
| Engine.door.renumProviders(); |
| } |
| |
| /** |
| * Returns a copy of the registered providers as an array. |
| */ |
| public static synchronized Provider[] getProviders() { |
| return providers.toArray(new Provider[providers.size()]); |
| } |
| |
| /** |
| * Returns a copy of the registered providers as a list. |
| */ |
| public static synchronized List<Provider> getProvidersList() { |
| return new ArrayList<Provider>(providers); |
| } |
| |
| /** |
| * Returns the provider with the specified name. |
| */ |
| public static synchronized Provider getProvider(String name) { |
| if (name == null) { |
| return null; |
| } |
| return providersNames.get(name); |
| } |
| |
| /** |
| * Inserts a provider at a specified 1-based position. |
| */ |
| public static synchronized int insertProviderAt(Provider provider, int position) { |
| int size = providers.size(); |
| if ((position < 1) || (position > size)) { |
| position = size + 1; |
| } |
| providers.add(position - 1, provider); |
| providersNames.put(provider.getName(), provider); |
| setNeedRefresh(); |
| return position; |
| } |
| |
| /** |
| * Removes the provider at the specified 1-based position. |
| */ |
| public static synchronized void removeProvider(int providerNumber) { |
| Provider p = providers.remove(providerNumber - 1); |
| providersNames.remove(p.getName()); |
| setNeedRefresh(); |
| } |
| |
| /** |
| * Adds information about provider services into HashMap. |
| */ |
| public static synchronized void initServiceInfo(Provider p) { |
| for (Provider.Service service : p.getServices()) { |
| String type = service.getType(); |
| if (cachedSecureRandomService == null && type.equals("SecureRandom")) { |
| cachedSecureRandomService = service; |
| } |
| String key = type + "." + service.getAlgorithm().toUpperCase(Locale.US); |
| if (!services.containsKey(key)) { |
| services.put(key, service); |
| } |
| for (String alias : Engine.door.getAliases(service)) { |
| key = type + "." + alias.toUpperCase(Locale.US); |
| if (!services.containsKey(key)) { |
| services.put(key, service); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Returns true if services does not contain any provider information. |
| */ |
| public static synchronized boolean isEmpty() { |
| return services.isEmpty(); |
| } |
| |
| /** |
| * Looks up the requested service by type and algorithm. The |
| * service key should be provided in the same format used when |
| * registering a service with a provider, for example, |
| * "KeyFactory.RSA". |
| * |
| * Callers can cache the returned service information but such |
| * caches should be validated against the result of |
| * Service.getCacheVersion() before use. |
| */ |
| public static synchronized Provider.Service getService(String key) { |
| return services.get(key); |
| } |
| |
| /** |
| * Returns the default SecureRandom service description. |
| */ |
| public static synchronized Provider.Service getSecureRandomService() { |
| getCacheVersion(); // used for side effect of updating cache if needed |
| return cachedSecureRandomService; |
| } |
| |
| /** |
| * In addition to being used here when the list of providers |
| * changes, this method is also used by the Provider |
| * implementation to indicate that a provides list of services has |
| * changed. |
| */ |
| public static synchronized void setNeedRefresh() { |
| needRefresh = true; |
| } |
| |
| /** |
| * Returns the current cache version. This has the possible side |
| * effect of updating the cache if needed. |
| */ |
| public static synchronized int getCacheVersion() { |
| if (needRefresh) { |
| cacheVersion++; |
| synchronized (services) { |
| services.clear(); |
| } |
| cachedSecureRandomService = null; |
| for (Provider p : providers) { |
| initServiceInfo(p); |
| } |
| needRefresh = false; |
| } |
| return cacheVersion; |
| } |
| } |