| /* |
| * Copyright (c) 2002, 2007, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.ssl; |
| |
| import java.security.*; |
| |
| /** |
| * The "KeyManager" for ephemeral RSA keys. Ephemeral DH and ECDH keys |
| * are handled by the DHCrypt and ECDHCrypt classes, respectively. |
| * |
| * @author Andreas Sterbenz |
| */ |
| final class EphemeralKeyManager { |
| |
| // indices for the keys array below |
| private static final int INDEX_RSA512 = 0; |
| private static final int INDEX_RSA1024 = 1; |
| |
| /* |
| * Current cached RSA KeyPairs. Elements are never null. |
| * Indexed via the constants above. |
| */ |
| private final EphemeralKeyPair[] keys = new EphemeralKeyPair[] { |
| new EphemeralKeyPair(null), |
| new EphemeralKeyPair(null), |
| }; |
| |
| EphemeralKeyManager() { |
| // empty |
| } |
| |
| /* |
| * Get a temporary RSA KeyPair. |
| */ |
| KeyPair getRSAKeyPair(boolean export, SecureRandom random) { |
| int length, index; |
| if (export) { |
| length = 512; |
| index = INDEX_RSA512; |
| } else { |
| length = 1024; |
| index = INDEX_RSA1024; |
| } |
| |
| synchronized (keys) { |
| KeyPair kp = keys[index].getKeyPair(); |
| if (kp == null) { |
| try { |
| KeyPairGenerator kgen = JsseJce.getKeyPairGenerator("RSA"); |
| kgen.initialize(length, random); |
| keys[index] = new EphemeralKeyPair(kgen.genKeyPair()); |
| kp = keys[index].getKeyPair(); |
| } catch (Exception e) { |
| // ignore |
| } |
| } |
| return kp; |
| } |
| } |
| |
| /** |
| * Inner class to handle storage of ephemeral KeyPairs. |
| */ |
| private static class EphemeralKeyPair { |
| |
| // maximum number of times a KeyPair is used |
| private static final int MAX_USE = 200; |
| |
| // maximum time interval in which the keypair is used (1 hour in ms) |
| private static final long USE_INTERVAL = 3600*1000; |
| |
| private KeyPair keyPair; |
| private int uses; |
| private long expirationTime; |
| |
| private EphemeralKeyPair(KeyPair keyPair) { |
| this.keyPair = keyPair; |
| expirationTime = System.currentTimeMillis() + USE_INTERVAL; |
| } |
| |
| /* |
| * Check if the KeyPair can still be used. |
| */ |
| private boolean isValid() { |
| return (keyPair != null) && (uses < MAX_USE) |
| && (System.currentTimeMillis() < expirationTime); |
| } |
| |
| /* |
| * Return the KeyPair or null if it is invalid. |
| */ |
| private KeyPair getKeyPair() { |
| if (isValid() == false) { |
| keyPair = null; |
| return null; |
| } |
| uses++; |
| return keyPair; |
| } |
| } |
| } |