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| 1 | /* | ||
| 2 | * Copyright (c) 2002, 2007, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.security.ssl; | ||
| 27 | |||
| 28 | import java.security.*; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * The "KeyManager" for ephemeral RSA keys. Ephemeral DH and ECDH keys | ||
| 32 | * are handled by the DHCrypt and ECDHCrypt classes, respectively. | ||
| 33 | * | ||
| 34 | * @author Andreas Sterbenz | ||
| 35 | */ | ||
| 36 | final class EphemeralKeyManager { | ||
| 37 | |||
| 38 | // indices for the keys array below | ||
| 39 | private final static int INDEX_RSA512 = 0; | ||
| 40 | private final static int INDEX_RSA1024 = 1; | ||
| 41 | |||
| 42 | /* | ||
| 43 | * Current cached RSA KeyPairs. Elements are never null. | ||
| 44 | * Indexed via the the constants above. | ||
| 45 | */ | ||
| 46 | private final EphemeralKeyPair[] keys = new EphemeralKeyPair[] { | ||
| 47 | new EphemeralKeyPair(null), | ||
| 48 | new EphemeralKeyPair(null), | ||
| 49 | }; | ||
| 50 | |||
| 51 | EphemeralKeyManager() { | ||
| 52 | // empty | ||
| 53 | } | ||
| 54 | |||
| 55 | /* | ||
| 56 | * Get a temporary RSA KeyPair. | ||
| 57 | */ | ||
| 58 | KeyPair getRSAKeyPair(boolean export, SecureRandom random) { | ||
| 59 | int length, index; | ||
| 60 | if (export) { | ||
| 61 | length = 512; | ||
| 62 | index = INDEX_RSA512; | ||
| 63 | } else { | ||
| 64 | length = 1024; | ||
| 65 | index = INDEX_RSA1024; | ||
| 66 | } | ||
| 67 | |||
| 68 | synchronized (keys) { | ||
| 69 | KeyPair kp = keys[index].getKeyPair(); | ||
| 70 | if (kp == null) { | ||
| 71 | try { | ||
| 72 | KeyPairGenerator kgen = JsseJce.getKeyPairGenerator("RSA"); | ||
| 73 | kgen.initialize(length, random); | ||
| 74 | keys[index] = new EphemeralKeyPair(kgen.genKeyPair()); | ||
| 75 | kp = keys[index].getKeyPair(); | ||
| 76 | } catch (Exception e) { | ||
| 77 | // ignore | ||
| 78 | } | ||
| 79 | } | ||
| 80 | return kp; | ||
| 81 | } | ||
| 82 | } | ||
| 83 | |||
| 84 | /** | ||
| 85 | * Inner class to handle storage of ephemeral KeyPairs. | ||
| 86 | */ | ||
| 87 | private static class EphemeralKeyPair { | ||
| 88 | |||
| 89 | // maximum number of times a KeyPair is used | ||
| 90 | private final static int MAX_USE = 200; | ||
| 91 | |||
| 92 | // maximum time interval in which the keypair is used (1 hour in ms) | ||
| 93 | private final static long USE_INTERVAL = 3600*1000; | ||
| 94 | |||
| 95 | private KeyPair keyPair; | ||
| 96 | private int uses; | ||
| 97 | private long expirationTime; | ||
| 98 | |||
| 99 | private EphemeralKeyPair(KeyPair keyPair) { | ||
| 100 | this.keyPair = keyPair; | ||
| 101 | expirationTime = System.currentTimeMillis() + USE_INTERVAL; | ||
| 102 | } | ||
| 103 | |||
| 104 | /* | ||
| 105 | * Check if the KeyPair can still be used. | ||
| 106 | */ | ||
| 107 | private boolean isValid() { | ||
| 108 | return (keyPair != null) && (uses < MAX_USE) | ||
| 109 | && (System.currentTimeMillis() < expirationTime); | ||
| 110 | } | ||
| 111 | |||
| 112 | /* | ||
| 113 | * Return the KeyPair or null if it is invalid. | ||
| 114 | */ | ||
| 115 | private KeyPair getKeyPair() { | ||
| 116 | if (isValid() == false) { | ||
| 117 | keyPair = null; | ||
| 118 | return null; | ||
| 119 | } | ||
| 120 | uses++; | ||
| 121 | return keyPair; | ||
| 122 | } | ||
| 123 | } | ||
| 124 | } | ||