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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 | +} | |