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103 lines
3.4 KiB
Java
103 lines
3.4 KiB
Java
/*
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* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.pkcs11;
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import java.util.*;
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import java.lang.ref.*;
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import java.security.Key;
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import sun.security.util.Cache;
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/**
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* Key to P11Key translation cache. The PKCS#11 token can only perform
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* operations on keys stored on the token (permanently or temporarily). That
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* means that in order to allow the PKCS#11 provider to use keys from other
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* providers, we need to transparently convert them to P11Keys. The engines
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* do that using (Secret)KeyFactories, which in turn use this class as a
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* cache.
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*
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* There are two KeyCache instances per provider, one for secret keys and
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* one for public and private keys.
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*
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* @author Andreas Sterbenz
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* @since 1.5
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*/
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final class KeyCache {
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private final Cache<IdentityWrapper, P11Key> strongCache;
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private WeakReference<Map<Key,P11Key>> cacheReference;
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KeyCache() {
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strongCache = Cache.newHardMemoryCache(16);
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}
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private static final class IdentityWrapper {
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final Object obj;
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IdentityWrapper(Object obj) {
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this.obj = obj;
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}
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public boolean equals(Object o) {
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if (this == o) {
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return true;
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}
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if (o instanceof IdentityWrapper == false) {
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return false;
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}
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IdentityWrapper other = (IdentityWrapper)o;
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return this.obj == other.obj;
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}
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public int hashCode() {
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return System.identityHashCode(obj);
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}
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}
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synchronized P11Key get(Key key) {
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P11Key p11Key = strongCache.get(new IdentityWrapper(key));
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if (p11Key != null) {
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return p11Key;
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}
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Map<Key,P11Key> map =
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(cacheReference == null) ? null : cacheReference.get();
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if (map == null) {
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return null;
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}
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return map.get(key);
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}
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synchronized void put(Key key, P11Key p11Key) {
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strongCache.put(new IdentityWrapper(key), p11Key);
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Map<Key,P11Key> map =
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(cacheReference == null) ? null : cacheReference.get();
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if (map == null) {
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map = new IdentityHashMap<>();
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cacheReference = new WeakReference<>(map);
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}
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map.put(key, p11Key);
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}
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}
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