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| 1 | +/* | |
| 2 | + * Copyright (c) 2002, 2011, 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 | + | |
| 27 | +package sun.security.ssl; | |
| 28 | + | |
| 29 | +import java.io.*; | |
| 30 | +import java.util.*; | |
| 31 | + | |
| 32 | +import javax.net.ssl.SSLException; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * A list of CipherSuites. Also maintains the lists of supported and | |
| 36 | + * default ciphersuites and supports I/O from handshake streams. | |
| 37 | + * | |
| 38 | + * Instances of this class are immutable. | |
| 39 | + * | |
| 40 | + */ | |
| 41 | +final class CipherSuiteList { | |
| 42 | + | |
| 43 | + private final Collection<CipherSuite> cipherSuites; | |
| 44 | + private String[] suiteNames; | |
| 45 | + | |
| 46 | + // flag indicating whether this list contains any ECC ciphersuites. | |
| 47 | + // null if not yet checked. | |
| 48 | + private volatile Boolean containsEC; | |
| 49 | + | |
| 50 | + // for use by buildAvailableCache() and | |
| 51 | + // Handshaker.getKickstartMessage() only | |
| 52 | + CipherSuiteList(Collection<CipherSuite> cipherSuites) { | |
| 53 | + this.cipherSuites = cipherSuites; | |
| 54 | + } | |
| 55 | + | |
| 56 | + /** | |
| 57 | + * Create a CipherSuiteList with a single element. | |
| 58 | + */ | |
| 59 | + CipherSuiteList(CipherSuite suite) { | |
| 60 | + cipherSuites = new ArrayList<CipherSuite>(1); | |
| 61 | + cipherSuites.add(suite); | |
| 62 | + } | |
| 63 | + | |
| 64 | + /** | |
| 65 | + * Construct a CipherSuiteList from a array of names. We don't bother | |
| 66 | + * to eliminate duplicates. | |
| 67 | + * | |
| 68 | + * @exception IllegalArgumentException if the array or any of its elements | |
| 69 | + * is null or if the ciphersuite name is unrecognized or unsupported | |
| 70 | + * using currently installed providers. | |
| 71 | + */ | |
| 72 | + CipherSuiteList(String[] names) { | |
| 73 | + if (names == null) { | |
| 74 | + throw new IllegalArgumentException("CipherSuites may not be null"); | |
| 75 | + } | |
| 76 | + cipherSuites = new ArrayList<CipherSuite>(names.length); | |
| 77 | + // refresh available cache once if a CipherSuite is not available | |
| 78 | + // (maybe new JCE providers have been installed) | |
| 79 | + boolean refreshed = false; | |
| 80 | + for (int i = 0; i < names.length; i++) { | |
| 81 | + String suiteName = names[i]; | |
| 82 | + CipherSuite suite = CipherSuite.valueOf(suiteName); | |
| 83 | + if (suite.isAvailable() == false) { | |
| 84 | + if (refreshed == false) { | |
| 85 | + // clear the cache so that the isAvailable() call below | |
| 86 | + // does a full check | |
| 87 | + clearAvailableCache(); | |
| 88 | + refreshed = true; | |
| 89 | + } | |
| 90 | + // still missing? | |
| 91 | + if (suite.isAvailable() == false) { | |
| 92 | + throw new IllegalArgumentException("Cannot support " | |
| 93 | + + suiteName + " with currently installed providers"); | |
| 94 | + } | |
| 95 | + } | |
| 96 | + cipherSuites.add(suite); | |
| 97 | + } | |
| 98 | + } | |
| 99 | + | |
| 100 | + /** | |
| 101 | + * Read a CipherSuiteList from a HandshakeInStream in V3 ClientHello | |
| 102 | + * format. Does not check if the listed ciphersuites are known or | |
| 103 | + * supported. | |
| 104 | + */ | |
| 105 | + CipherSuiteList(HandshakeInStream in) throws IOException { | |
| 106 | + byte[] bytes = in.getBytes16(); | |
| 107 | + if ((bytes.length & 1) != 0) { | |
| 108 | + throw new SSLException("Invalid ClientHello message"); | |
| 109 | + } | |
| 110 | + cipherSuites = new ArrayList<CipherSuite>(bytes.length >> 1); | |
| 111 | + for (int i = 0; i < bytes.length; i += 2) { | |
| 112 | + cipherSuites.add(CipherSuite.valueOf(bytes[i], bytes[i+1])); | |
| 113 | + } | |
| 114 | + } | |
| 115 | + | |
| 116 | + /** | |
| 117 | + * Return whether this list contains the given CipherSuite. | |
| 118 | + */ | |
| 119 | + boolean contains(CipherSuite suite) { | |
| 120 | + return cipherSuites.contains(suite); | |
| 121 | + } | |
| 122 | + | |
| 123 | + // Return whether this list contains any ECC ciphersuites | |
| 124 | + boolean containsEC() { | |
| 125 | + if (containsEC == null) { | |
| 126 | + for (CipherSuite c : cipherSuites) { | |
| 127 | + switch (c.keyExchange) { | |
| 128 | + case K_ECDH_ECDSA: | |
| 129 | + case K_ECDH_RSA: | |
| 130 | + case K_ECDHE_ECDSA: | |
| 131 | + case K_ECDHE_RSA: | |
| 132 | + case K_ECDH_ANON: | |
| 133 | + containsEC = true; | |
| 134 | + return true; | |
| 135 | + default: | |
| 136 | + break; | |
| 137 | + } | |
| 138 | + } | |
| 139 | + containsEC = false; | |
| 140 | + } | |
| 141 | + return containsEC; | |
| 142 | + } | |
| 143 | + | |
| 144 | + /** | |
| 145 | + * Return an Iterator for the CipherSuites in this list. | |
| 146 | + */ | |
| 147 | + Iterator<CipherSuite> iterator() { | |
| 148 | + return cipherSuites.iterator(); | |
| 149 | + } | |
| 150 | + | |
| 151 | + /** | |
| 152 | + * Return a reference to the internal Collection of CipherSuites. | |
| 153 | + * The Collection MUST NOT be modified. | |
| 154 | + */ | |
| 155 | + Collection<CipherSuite> collection() { | |
| 156 | + return cipherSuites; | |
| 157 | + } | |
| 158 | + | |
| 159 | + /** | |
| 160 | + * Return the number of CipherSuites in this list. | |
| 161 | + */ | |
| 162 | + int size() { | |
| 163 | + return cipherSuites.size(); | |
| 164 | + } | |
| 165 | + | |
| 166 | + /** | |
| 167 | + * Return an array with the names of the CipherSuites in this list. | |
| 168 | + */ | |
| 169 | + synchronized String[] toStringArray() { | |
| 170 | + if (suiteNames == null) { | |
| 171 | + suiteNames = new String[cipherSuites.size()]; | |
| 172 | + int i = 0; | |
| 173 | + for (CipherSuite c : cipherSuites) { | |
| 174 | + suiteNames[i++] = c.name; | |
| 175 | + } | |
| 176 | + } | |
| 177 | + return suiteNames.clone(); | |
| 178 | + } | |
| 179 | + | |
| 180 | + public String toString() { | |
| 181 | + return cipherSuites.toString(); | |
| 182 | + } | |
| 183 | + | |
| 184 | + /** | |
| 185 | + * Write this list to an HandshakeOutStream in V3 ClientHello format. | |
| 186 | + */ | |
| 187 | + void send(HandshakeOutStream s) throws IOException { | |
| 188 | + byte[] suiteBytes = new byte[cipherSuites.size() * 2]; | |
| 189 | + int i = 0; | |
| 190 | + for (CipherSuite c : cipherSuites) { | |
| 191 | + suiteBytes[i] = (byte)(c.id >> 8); | |
| 192 | + suiteBytes[i+1] = (byte)c.id; | |
| 193 | + i += 2; | |
| 194 | + } | |
| 195 | + s.putBytes16(suiteBytes); | |
| 196 | + } | |
| 197 | + | |
| 198 | + /** | |
| 199 | + * Clear cache of available ciphersuites. If we support all ciphers | |
| 200 | + * internally, there is no need to clear the cache and calling this | |
| 201 | + * method has no effect. | |
| 202 | + */ | |
| 203 | + static synchronized void clearAvailableCache() { | |
| 204 | + if (CipherSuite.DYNAMIC_AVAILABILITY) { | |
| 205 | + CipherSuite.BulkCipher.clearAvailableCache(); | |
| 206 | + JsseJce.clearEcAvailable(); | |
| 207 | + } | |
| 208 | + } | |
| 209 | +} | |