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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 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 | package java.security; | ||
| 27 | |||
| 28 | import java.lang.reflect.*; | ||
| 29 | import java.util.*; | ||
| 30 | import java.util.concurrent.ConcurrentHashMap; | ||
| 31 | import java.io.*; | ||
| 32 | import java.net.URL; | ||
| 33 | import sun.security.util.Debug; | ||
| 34 | import sun.security.util.PropertyExpander; | ||
| 35 | |||
| 36 | import java.security.Provider.Service; | ||
| 37 | |||
| 38 | import sun.security.jca.*; | ||
| 39 | |||
| 40 | /** | ||
| 41 | * <p>This class centralizes all security properties and common security | ||
| 42 | * methods. One of its primary uses is to manage providers. | ||
| 43 | * | ||
| 44 | * @author Benjamin Renaud | ||
| 45 | */ | ||
| 46 | |||
| 47 | public final class Security { | ||
| 48 | |||
| 49 | /* Are we debugging? -- for developers */ | ||
| 50 | private static final Debug sdebug = | ||
| 51 | Debug.getInstance("properties"); | ||
| 52 | |||
| 53 | /* The java.security properties */ | ||
| 54 | private static Properties props; | ||
| 55 | |||
| 56 | // An element in the cache | ||
| 57 | private static class ProviderProperty { | ||
| 58 | String className; | ||
| 59 | Provider provider; | ||
| 60 | } | ||
| 61 | |||
| 62 | static { | ||
| 63 | // doPrivileged here because there are multiple | ||
| 64 | // things in initialize that might require privs. | ||
| 65 | // (the FileInputStream call and the File.exists call, | ||
| 66 | // the securityPropFile call, etc) | ||
| 67 | AccessController.doPrivileged(new PrivilegedAction<Void>() { | ||
| 68 | public Void run() { | ||
| 69 | initialize(); | ||
| 70 | return null; | ||
| 71 | } | ||
| 72 | }); | ||
| 73 | } | ||
| 74 | |||
| 75 | private static void initialize() { | ||
| 76 | props = new Properties(); | ||
| 77 | boolean loadedProps = false; | ||
| 78 | boolean overrideAll = false; | ||
| 79 | |||
| 80 | // first load the system properties file | ||
| 81 | // to determine the value of security.overridePropertiesFile | ||
| 82 | File propFile = securityPropFile("java.security"); | ||
| 83 | if (propFile.exists()) { | ||
| 84 | InputStream is = null; | ||
| 85 | try { | ||
| 86 | FileInputStream fis = new FileInputStream(propFile); | ||
| 87 | is = new BufferedInputStream(fis); | ||
| 88 | props.load(is); | ||
| 89 | loadedProps = true; | ||
| 90 | |||
| 91 | if (sdebug != null) { | ||
| 92 | sdebug.println("reading security properties file: " + | ||
| 93 | propFile); | ||
| 94 | } | ||
| 95 | } catch (IOException e) { | ||
| 96 | if (sdebug != null) { | ||
| 97 | sdebug.println("unable to load security properties from " + | ||
| 98 | propFile); | ||
| 99 | e.printStackTrace(); | ||
| 100 | } | ||
| 101 | } finally { | ||
| 102 | if (is != null) { | ||
| 103 | try { | ||
| 104 | is.close(); | ||
| 105 | } catch (IOException ioe) { | ||
| 106 | if (sdebug != null) { | ||
| 107 | sdebug.println("unable to close input stream"); | ||
| 108 | } | ||
| 109 | } | ||
| 110 | } | ||
| 111 | } | ||
| 112 | } | ||
| 113 | |||
| 114 | if ("true".equalsIgnoreCase(props.getProperty | ||
| 115 | ("security.overridePropertiesFile"))) { | ||
| 116 | |||
| 117 | String extraPropFile = System.getProperty | ||
| 118 | ("java.security.properties"); | ||
| 119 | if (extraPropFile != null && extraPropFile.startsWith("=")) { | ||
| 120 | overrideAll = true; | ||
| 121 | extraPropFile = extraPropFile.substring(1); | ||
| 122 | } | ||
| 123 | |||
| 124 | if (overrideAll) { | ||
| 125 | props = new Properties(); | ||
| 126 | if (sdebug != null) { | ||
| 127 | sdebug.println | ||
| 128 | ("overriding other security properties files!"); | ||
| 129 | } | ||
| 130 | } | ||
| 131 | |||
| 132 | // now load the user-specified file so its values | ||
| 133 | // will win if they conflict with the earlier values | ||
| 134 | if (extraPropFile != null) { | ||
| 135 | BufferedInputStream bis = null; | ||
| 136 | try { | ||
| 137 | URL propURL; | ||
| 138 | |||
| 139 | extraPropFile = PropertyExpander.expand(extraPropFile); | ||
| 140 | propFile = new File(extraPropFile); | ||
| 141 | if (propFile.exists()) { | ||
| 142 | propURL = new URL | ||
| 143 | ("file:" + propFile.getCanonicalPath()); | ||
| 144 | } else { | ||
| 145 | propURL = new URL(extraPropFile); | ||
| 146 | } | ||
| 147 | bis = new BufferedInputStream(propURL.openStream()); | ||
| 148 | props.load(bis); | ||
| 149 | loadedProps = true; | ||
| 150 | |||
| 151 | if (sdebug != null) { | ||
| 152 | sdebug.println("reading security properties file: " + | ||
| 153 | propURL); | ||
| 154 | if (overrideAll) { | ||
| 155 | sdebug.println | ||
| 156 | ("overriding other security properties files!"); | ||
| 157 | } | ||
| 158 | } | ||
| 159 | } catch (Exception e) { | ||
| 160 | if (sdebug != null) { | ||
| 161 | sdebug.println | ||
| 162 | ("unable to load security properties from " + | ||
| 163 | extraPropFile); | ||
| 164 | e.printStackTrace(); | ||
| 165 | } | ||
| 166 | } finally { | ||
| 167 | if (bis != null) { | ||
| 168 | try { | ||
| 169 | bis.close(); | ||
| 170 | } catch (IOException ioe) { | ||
| 171 | if (sdebug != null) { | ||
| 172 | sdebug.println("unable to close input stream"); | ||
| 173 | } | ||
| 174 | } | ||
| 175 | } | ||
| 176 | } | ||
| 177 | } | ||
| 178 | } | ||
| 179 | |||
| 180 | if (!loadedProps) { | ||
| 181 | initializeStatic(); | ||
| 182 | if (sdebug != null) { | ||
| 183 | sdebug.println("unable to load security properties " + | ||
| 184 | "-- using defaults"); | ||
| 185 | } | ||
| 186 | } | ||
| 187 | |||
| 188 | } | ||
| 189 | |||
| 190 | /* | ||
| 191 | * Initialize to default values, if <java.home>/lib/java.security | ||
| 192 | * is not found. | ||
| 193 | */ | ||
| 194 | private static void initializeStatic() { | ||
| 195 | props.put("security.provider.1", "sun.security.provider.Sun"); | ||
| 196 | props.put("security.provider.2", "sun.security.rsa.SunRsaSign"); | ||
| 197 | props.put("security.provider.3", "com.sun.net.ssl.internal.ssl.Provider"); | ||
| 198 | props.put("security.provider.4", "com.sun.crypto.provider.SunJCE"); | ||
| 199 | props.put("security.provider.5", "sun.security.jgss.SunProvider"); | ||
| 200 | props.put("security.provider.6", "com.sun.security.sasl.Provider"); | ||
| 201 | } | ||
| 202 | |||
| 203 | /** | ||
| 204 | * Don't let anyone instantiate this. | ||
| 205 | */ | ||
| 206 | private Security() { | ||
| 207 | } | ||
| 208 | |||
| 209 | private static File securityPropFile(String filename) { | ||
| 210 | // maybe check for a system property which will specify where to | ||
| 211 | // look. Someday. | ||
| 212 | String sep = File.separator; | ||
| 213 | return new File(System.getProperty("java.home") + sep + "lib" + sep + | ||
| 214 | "security" + sep + filename); | ||
| 215 | } | ||
| 216 | |||
| 217 | /** | ||
| 218 | * Looks up providers, and returns the property (and its associated | ||
| 219 | * provider) mapping the key, if any. | ||
| 220 | * The order in which the providers are looked up is the | ||
| 221 | * provider-preference order, as specificed in the security | ||
| 222 | * properties file. | ||
| 223 | */ | ||
| 224 | private static ProviderProperty getProviderProperty(String key) { | ||
| 225 | ProviderProperty entry = null; | ||
| 226 | |||
| 227 | List<Provider> providers = Providers.getProviderList().providers(); | ||
| 228 | for (int i = 0; i < providers.size(); i++) { | ||
| 229 | |||
| 230 | String matchKey = null; | ||
| 231 | Provider prov = providers.get(i); | ||
| 232 | String prop = prov.getProperty(key); | ||
| 233 | |||
| 234 | if (prop == null) { | ||
| 235 | // Is there a match if we do a case-insensitive property name | ||
| 236 | // comparison? Let's try ... | ||
| 237 | for (Enumeration<Object> e = prov.keys(); | ||
| 238 | e.hasMoreElements() && prop == null; ) { | ||
| 239 | matchKey = (String)e.nextElement(); | ||
| 240 | if (key.equalsIgnoreCase(matchKey)) { | ||
| 241 | prop = prov.getProperty(matchKey); | ||
| 242 | break; | ||
| 243 | } | ||
| 244 | } | ||
| 245 | } | ||
| 246 | |||
| 247 | if (prop != null) { | ||
| 248 | ProviderProperty newEntry = new ProviderProperty(); | ||
| 249 | newEntry.className = prop; | ||
| 250 | newEntry.provider = prov; | ||
| 251 | return newEntry; | ||
| 252 | } | ||
| 253 | } | ||
| 254 | |||
| 255 | return entry; | ||
| 256 | } | ||
| 257 | |||
| 258 | /** | ||
| 259 | * Returns the property (if any) mapping the key for the given provider. | ||
| 260 | */ | ||
| 261 | private static String getProviderProperty(String key, Provider provider) { | ||
| 262 | String prop = provider.getProperty(key); | ||
| 263 | if (prop == null) { | ||
| 264 | // Is there a match if we do a case-insensitive property name | ||
| 265 | // comparison? Let's try ... | ||
| 266 | for (Enumeration<Object> e = provider.keys(); | ||
| 267 | e.hasMoreElements() && prop == null; ) { | ||
| 268 | String matchKey = (String)e.nextElement(); | ||
| 269 | if (key.equalsIgnoreCase(matchKey)) { | ||
| 270 | prop = provider.getProperty(matchKey); | ||
| 271 | break; | ||
| 272 | } | ||
| 273 | } | ||
| 274 | } | ||
| 275 | return prop; | ||
| 276 | } | ||
| 277 | |||
| 278 | /** | ||
| 279 | * Gets a specified property for an algorithm. The algorithm name | ||
| 280 | * should be a standard name. See the <a href= | ||
| 281 | * "{@docRoot}/../technotes/guides/security/StandardNames.html"> | ||
| 282 | * Java Cryptography Architecture Standard Algorithm Name Documentation</a> | ||
| 283 | * for information about standard algorithm names. | ||
| 284 | * | ||
| 285 | * One possible use is by specialized algorithm parsers, which may map | ||
| 286 | * classes to algorithms which they understand (much like Key parsers | ||
| 287 | * do). | ||
| 288 | * | ||
| 289 | * @param algName the algorithm name. | ||
| 290 | * | ||
| 291 | * @param propName the name of the property to get. | ||
| 292 | * | ||
| 293 | * @return the value of the specified property. | ||
| 294 | * | ||
| 295 | * @deprecated This method used to return the value of a proprietary | ||
| 296 | * property in the master file of the "SUN" Cryptographic Service | ||
| 297 | * Provider in order to determine how to parse algorithm-specific | ||
| 298 | * parameters. Use the new provider-based and algorithm-independent | ||
| 299 | * <code>AlgorithmParameters</code> and <code>KeyFactory</code> engine | ||
| 300 | * classes (introduced in the J2SE version 1.2 platform) instead. | ||
| 301 | */ | ||
| 302 | @Deprecated | ||
| 303 | public static String getAlgorithmProperty(String algName, | ||
| 304 | String propName) { | ||
| 305 | ProviderProperty entry = getProviderProperty("Alg." + propName | ||
| 306 | + "." + algName); | ||
| 307 | if (entry != null) { | ||
| 308 | return entry.className; | ||
| 309 | } else { | ||
| 310 | return null; | ||
| 311 | } | ||
| 312 | } | ||
| 313 | |||
| 314 | /** | ||
| 315 | * Adds a new provider, at a specified position. The position is | ||
| 316 | * the preference order in which providers are searched for | ||
| 317 | * requested algorithms. The position is 1-based, that is, | ||
| 318 | * 1 is most preferred, followed by 2, and so on. | ||
| 319 | * | ||
| 320 | * <p>If the given provider is installed at the requested position, | ||
| 321 | * the provider that used to be at that position, and all providers | ||
| 322 | * with a position greater than <code>position</code>, are shifted up | ||
| 323 | * one position (towards the end of the list of installed providers). | ||
| 324 | * | ||
| 325 | * <p>A provider cannot be added if it is already installed. | ||
| 326 | * | ||
| 327 | * <p>First, if there is a security manager, its | ||
| 328 | * <code>checkSecurityAccess</code> | ||
| 329 | * method is called with the string | ||
| 330 | * <code>"insertProvider."+provider.getName()</code> | ||
| 331 | * to see if it's ok to add a new provider. | ||
| 332 | * If the default implementation of <code>checkSecurityAccess</code> | ||
| 333 | * is used (i.e., that method is not overriden), then this will result in | ||
| 334 | * a call to the security manager's <code>checkPermission</code> method | ||
| 335 | * with a | ||
| 336 | * <code>SecurityPermission("insertProvider."+provider.getName())</code> | ||
| 337 | * permission. | ||
| 338 | * | ||
| 339 | * @param provider the provider to be added. | ||
| 340 | * | ||
| 341 | * @param position the preference position that the caller would | ||
| 342 | * like for this provider. | ||
| 343 | * | ||
| 344 | * @return the actual preference position in which the provider was | ||
| 345 | * added, or -1 if the provider was not added because it is | ||
| 346 | * already installed. | ||
| 347 | * | ||
| 348 | * @throws NullPointerException if provider is null | ||
| 349 | * @throws SecurityException | ||
| 350 | * if a security manager exists and its <code>{@link | ||
| 351 | * java.lang.SecurityManager#checkSecurityAccess}</code> method | ||
| 352 | * denies access to add a new provider | ||
| 353 | * | ||
| 354 | * @see #getProvider | ||
| 355 | * @see #removeProvider | ||
| 356 | * @see java.security.SecurityPermission | ||
| 357 | */ | ||
| 358 | public static synchronized int insertProviderAt(Provider provider, | ||
| 359 | int position) { | ||
| 360 | String providerName = provider.getName(); | ||
| 361 | check("insertProvider." + providerName); | ||
| 362 | ProviderList list = Providers.getFullProviderList(); | ||
| 363 | ProviderList newList = ProviderList.insertAt(list, provider, position - 1); | ||
| 364 | if (list == newList) { | ||
| 365 | return -1; | ||
| 366 | } | ||
| 367 | Providers.setProviderList(newList); | ||
| 368 | return newList.getIndex(providerName) + 1; | ||
| 369 | } | ||
| 370 | |||
| 371 | /** | ||
| 372 | * Adds a provider to the next position available. | ||
| 373 | * | ||
| 374 | * <p>First, if there is a security manager, its | ||
| 375 | * <code>checkSecurityAccess</code> | ||
| 376 | * method is called with the string | ||
| 377 | * <code>"insertProvider."+provider.getName()</code> | ||
| 378 | * to see if it's ok to add a new provider. | ||
| 379 | * If the default implementation of <code>checkSecurityAccess</code> | ||
| 380 | * is used (i.e., that method is not overriden), then this will result in | ||
| 381 | * a call to the security manager's <code>checkPermission</code> method | ||
| 382 | * with a | ||
| 383 | * <code>SecurityPermission("insertProvider."+provider.getName())</code> | ||
| 384 | * permission. | ||
| 385 | * | ||
| 386 | * @param provider the provider to be added. | ||
| 387 | * | ||
| 388 | * @return the preference position in which the provider was | ||
| 389 | * added, or -1 if the provider was not added because it is | ||
| 390 | * already installed. | ||
| 391 | * | ||
| 392 | * @throws NullPointerException if provider is null | ||
| 393 | * @throws SecurityException | ||
| 394 | * if a security manager exists and its <code>{@link | ||
| 395 | * java.lang.SecurityManager#checkSecurityAccess}</code> method | ||
| 396 | * denies access to add a new provider | ||
| 397 | * | ||
| 398 | * @see #getProvider | ||
| 399 | * @see #removeProvider | ||
| 400 | * @see java.security.SecurityPermission | ||
| 401 | */ | ||
| 402 | public static int addProvider(Provider provider) { | ||
| 403 | /* | ||
| 404 | * We can't assign a position here because the statically | ||
| 405 | * registered providers may not have been installed yet. | ||
| 406 | * insertProviderAt() will fix that value after it has | ||
| 407 | * loaded the static providers. | ||
| 408 | */ | ||
| 409 | return insertProviderAt(provider, 0); | ||
| 410 | } | ||
| 411 | |||
| 412 | /** | ||
| 413 | * Removes the provider with the specified name. | ||
| 414 | * | ||
| 415 | * <p>When the specified provider is removed, all providers located | ||
| 416 | * at a position greater than where the specified provider was are shifted | ||
| 417 | * down one position (towards the head of the list of installed | ||
| 418 | * providers). | ||
| 419 | * | ||
| 420 | * <p>This method returns silently if the provider is not installed or | ||
| 421 | * if name is null. | ||
| 422 | * | ||
| 423 | * <p>First, if there is a security manager, its | ||
| 424 | * <code>checkSecurityAccess</code> | ||
| 425 | * method is called with the string <code>"removeProvider."+name</code> | ||
| 426 | * to see if it's ok to remove the provider. | ||
| 427 | * If the default implementation of <code>checkSecurityAccess</code> | ||
| 428 | * is used (i.e., that method is not overriden), then this will result in | ||
| 429 | * a call to the security manager's <code>checkPermission</code> method | ||
| 430 | * with a <code>SecurityPermission("removeProvider."+name)</code> | ||
| 431 | * permission. | ||
| 432 | * | ||
| 433 | * @param name the name of the provider to remove. | ||
| 434 | * | ||
| 435 | * @throws SecurityException | ||
| 436 | * if a security manager exists and its <code>{@link | ||
| 437 | * java.lang.SecurityManager#checkSecurityAccess}</code> method | ||
| 438 | * denies | ||
| 439 | * access to remove the provider | ||
| 440 | * | ||
| 441 | * @see #getProvider | ||
| 442 | * @see #addProvider | ||
| 443 | */ | ||
| 444 | public static synchronized void removeProvider(String name) { | ||
| 445 | check("removeProvider." + name); | ||
| 446 | ProviderList list = Providers.getFullProviderList(); | ||
| 447 | ProviderList newList = ProviderList.remove(list, name); | ||
| 448 | Providers.setProviderList(newList); | ||
| 449 | } | ||
| 450 | |||
| 451 | /** | ||
| 452 | * Returns an array containing all the installed providers. The order of | ||
| 453 | * the providers in the array is their preference order. | ||
| 454 | * | ||
| 455 | * @return an array of all the installed providers. | ||
| 456 | */ | ||
| 457 | public static Provider[] getProviders() { | ||
| 458 | return Providers.getFullProviderList().toArray(); | ||
| 459 | } | ||
| 460 | |||
| 461 | /** | ||
| 462 | * Returns the provider installed with the specified name, if | ||
| 463 | * any. Returns null if no provider with the specified name is | ||
| 464 | * installed or if name is null. | ||
| 465 | * | ||
| 466 | * @param name the name of the provider to get. | ||
| 467 | * | ||
| 468 | * @return the provider of the specified name. | ||
| 469 | * | ||
| 470 | * @see #removeProvider | ||
| 471 | * @see #addProvider | ||
| 472 | */ | ||
| 473 | public static Provider getProvider(String name) { | ||
| 474 | return Providers.getProviderList().getProvider(name); | ||
| 475 | } | ||
| 476 | |||
| 477 | /** | ||
| 478 | * Returns an array containing all installed providers that satisfy the | ||
| 479 | * specified selection criterion, or null if no such providers have been | ||
| 480 | * installed. The returned providers are ordered | ||
| 481 | * according to their <a href= | ||
| 482 | * "#insertProviderAt(java.security.Provider, int)">preference order</a>. | ||
| 483 | * | ||
| 484 | * <p> A cryptographic service is always associated with a particular | ||
| 485 | * algorithm or type. For example, a digital signature service is | ||
| 486 | * always associated with a particular algorithm (e.g., DSA), | ||
| 487 | * and a CertificateFactory service is always associated with | ||
| 488 | * a particular certificate type (e.g., X.509). | ||
| 489 | * | ||
| 490 | * <p>The selection criterion must be specified in one of the following two | ||
| 491 | * formats: | ||
| 492 | * <ul> | ||
| 493 | * <li> <i><crypto_service>.<algorithm_or_type></i> <p> The | ||
| 494 | * cryptographic service name must not contain any dots. | ||
| 495 | * <p> A | ||
| 496 | * provider satisfies the specified selection criterion iff the provider | ||
| 497 | * implements the | ||
| 498 | * specified algorithm or type for the specified cryptographic service. | ||
| 499 | * <p> For example, "CertificateFactory.X.509" | ||
| 500 | * would be satisfied by any provider that supplied | ||
| 501 | * a CertificateFactory implementation for X.509 certificates. | ||
| 502 | * <li> <i><crypto_service>.<algorithm_or_type> | ||
| 503 | * <attribute_name>:< attribute_value></i> | ||
| 504 | * <p> The cryptographic service name must not contain any dots. There | ||
| 505 | * must be one or more space charaters between the | ||
| 506 | * <i><algorithm_or_type></i> and the <i><attribute_name></i>. | ||
| 507 | * <p> A provider satisfies this selection criterion iff the | ||
| 508 | * provider implements the specified algorithm or type for the specified | ||
| 509 | * cryptographic service and its implementation meets the | ||
| 510 | * constraint expressed by the specified attribute name/value pair. | ||
| 511 | * <p> For example, "Signature.SHA1withDSA KeySize:1024" would be | ||
| 512 | * satisfied by any provider that implemented | ||
| 513 | * the SHA1withDSA signature algorithm with a keysize of 1024 (or larger). | ||
| 514 | * | ||
| 515 | * </ul> | ||
| 516 | * | ||
| 517 | * <p> See the <a href= | ||
| 518 | * "{@docRoot}/../technotes/guides/security/StandardNames.html"> | ||
| 519 | * Java Cryptography Architecture Standard Algorithm Name Documentation</a> | ||
| 520 | * for information about standard cryptographic service names, standard | ||
| 521 | * algorithm names and standard attribute names. | ||
| 522 | * | ||
| 523 | * @param filter the criterion for selecting | ||
| 524 | * providers. The filter is case-insensitive. | ||
| 525 | * | ||
| 526 | * @return all the installed providers that satisfy the selection | ||
| 527 | * criterion, or null if no such providers have been installed. | ||
| 528 | * | ||
| 529 | * @throws InvalidParameterException | ||
| 530 | * if the filter is not in the required format | ||
| 531 | * @throws NullPointerException if filter is null | ||
| 532 | * | ||
| 533 | * @see #getProviders(java.util.Map) | ||
| 534 | * @since 1.3 | ||
| 535 | */ | ||
| 536 | public static Provider[] getProviders(String filter) { | ||
| 537 | String key = null; | ||
| 538 | String value = null; | ||
| 539 | int index = filter.indexOf(':'); | ||
| 540 | |||
| 541 | if (index == -1) { | ||
| 542 | key = filter; | ||
| 543 | value = ""; | ||
| 544 | } else { | ||
| 545 | key = filter.substring(0, index); | ||
| 546 | value = filter.substring(index + 1); | ||
| 547 | } | ||
| 548 | |||
| 549 | Hashtable<String, String> hashtableFilter = new Hashtable<>(1); | ||
| 550 | hashtableFilter.put(key, value); | ||
| 551 | |||
| 552 | return (getProviders(hashtableFilter)); | ||
| 553 | } | ||
| 554 | |||
| 555 | /** | ||
| 556 | * Returns an array containing all installed providers that satisfy the | ||
| 557 | * specified* selection criteria, or null if no such providers have been | ||
| 558 | * installed. The returned providers are ordered | ||
| 559 | * according to their <a href= | ||
| 560 | * "#insertProviderAt(java.security.Provider, int)">preference order</a>. | ||
| 561 | * | ||
| 562 | * <p>The selection criteria are represented by a map. | ||
| 563 | * Each map entry represents a selection criterion. | ||
| 564 | * A provider is selected iff it satisfies all selection | ||
| 565 | * criteria. The key for any entry in such a map must be in one of the | ||
| 566 | * following two formats: | ||
| 567 | * <ul> | ||
| 568 | * <li> <i><crypto_service>.<algorithm_or_type></i> | ||
| 569 | * <p> The cryptographic service name must not contain any dots. | ||
| 570 | * <p> The value associated with the key must be an empty string. | ||
| 571 | * <p> A provider | ||
| 572 | * satisfies this selection criterion iff the provider implements the | ||
| 573 | * specified algorithm or type for the specified cryptographic service. | ||
| 574 | * <li> <i><crypto_service>.<algorithm_or_type> <attribute_name></i> | ||
| 575 | * <p> The cryptographic service name must not contain any dots. There | ||
| 576 | * must be one or more space charaters between the <i><algorithm_or_type></i> | ||
| 577 | * and the <i><attribute_name></i>. | ||
| 578 | * <p> The value associated with the key must be a non-empty string. | ||
| 579 | * A provider satisfies this selection criterion iff the | ||
| 580 | * provider implements the specified algorithm or type for the specified | ||
| 581 | * cryptographic service and its implementation meets the | ||
| 582 | * constraint expressed by the specified attribute name/value pair. | ||
| 583 | * </ul> | ||
| 584 | * | ||
| 585 | * <p> See the <a href= | ||
| 586 | * "../../../technotes/guides/security/StandardNames.html"> | ||
| 587 | * Java Cryptography Architecture Standard Algorithm Name Documentation</a> | ||
| 588 | * for information about standard cryptographic service names, standard | ||
| 589 | * algorithm names and standard attribute names. | ||
| 590 | * | ||
| 591 | * @param filter the criteria for selecting | ||
| 592 | * providers. The filter is case-insensitive. | ||
| 593 | * | ||
| 594 | * @return all the installed providers that satisfy the selection | ||
| 595 | * criteria, or null if no such providers have been installed. | ||
| 596 | * | ||
| 597 | * @throws InvalidParameterException | ||
| 598 | * if the filter is not in the required format | ||
| 599 | * @throws NullPointerException if filter is null | ||
| 600 | * | ||
| 601 | * @see #getProviders(java.lang.String) | ||
| 602 | * @since 1.3 | ||
| 603 | */ | ||
| 604 | public static Provider[] getProviders(Map<String,String> filter) { | ||
| 605 | // Get all installed providers first. | ||
| 606 | // Then only return those providers who satisfy the selection criteria. | ||
| 607 | Provider[] allProviders = Security.getProviders(); | ||
| 608 | Set<String> keySet = filter.keySet(); | ||
| 609 | LinkedHashSet<Provider> candidates = new LinkedHashSet<>(5); | ||
| 610 | |||
| 611 | // Returns all installed providers | ||
| 612 | // if the selection criteria is null. | ||
| 613 | if ((keySet == null) || (allProviders == null)) { | ||
| 614 | return allProviders; | ||
| 615 | } | ||
| 616 | |||
| 617 | boolean firstSearch = true; | ||
| 618 | |||
| 619 | // For each selection criterion, remove providers | ||
| 620 | // which don't satisfy the criterion from the candidate set. | ||
| 621 | for (Iterator<String> ite = keySet.iterator(); ite.hasNext(); ) { | ||
| 622 | String key = ite.next(); | ||
| 623 | String value = filter.get(key); | ||
| 624 | |||
| 625 | LinkedHashSet<Provider> newCandidates = getAllQualifyingCandidates(key, value, | ||
| 626 | allProviders); | ||
| 627 | if (firstSearch) { | ||
| 628 | candidates = newCandidates; | ||
| 629 | firstSearch = false; | ||
| 630 | } | ||
| 631 | |||
| 632 | if ((newCandidates != null) && !newCandidates.isEmpty()) { | ||
| 633 | // For each provider in the candidates set, if it | ||
| 634 | // isn't in the newCandidate set, we should remove | ||
| 635 | // it from the candidate set. | ||
| 636 | for (Iterator<Provider> cansIte = candidates.iterator(); | ||
| 637 | cansIte.hasNext(); ) { | ||
| 638 | Provider prov = cansIte.next(); | ||
| 639 | if (!newCandidates.contains(prov)) { | ||
| 640 | cansIte.remove(); | ||
| 641 | } | ||
| 642 | } | ||
| 643 | } else { | ||
| 644 | candidates = null; | ||
| 645 | break; | ||
| 646 | } | ||
| 647 | } | ||
| 648 | |||
| 649 | if ((candidates == null) || (candidates.isEmpty())) | ||
| 650 | return null; | ||
| 651 | |||
| 652 | Object[] candidatesArray = candidates.toArray(); | ||
| 653 | Provider[] result = new Provider[candidatesArray.length]; | ||
| 654 | |||
| 655 | for (int i = 0; i < result.length; i++) { | ||
| 656 | result[i] = (Provider)candidatesArray[i]; | ||
| 657 | } | ||
| 658 | |||
| 659 | return result; | ||
| 660 | } | ||
| 661 | |||
| 662 | // Map containing cached Spi Class objects of the specified type | ||
| 663 | private static final Map<String, Class> spiMap = new ConcurrentHashMap<>(); | ||
| 664 | |||
| 665 | /** | ||
| 666 | * Return the Class object for the given engine type | ||
| 667 | * (e.g. "MessageDigest"). Works for Spis in the java.security package | ||
| 668 | * only. | ||
| 669 | */ | ||
| 670 | private static Class getSpiClass(String type) { | ||
| 671 | Class clazz = spiMap.get(type); | ||
| 672 | if (clazz != null) { | ||
| 673 | return clazz; | ||
| 674 | } | ||
| 675 | try { | ||
| 676 | clazz = Class.forName("java.security." + type + "Spi"); | ||
| 677 | spiMap.put(type, clazz); | ||
| 678 | return clazz; | ||
| 679 | } catch (ClassNotFoundException e) { | ||
| 680 | throw new AssertionError("Spi class not found", e); | ||
| 681 | } | ||
| 682 | } | ||
| 683 | |||
| 684 | /* | ||
| 685 | * Returns an array of objects: the first object in the array is | ||
| 686 | * an instance of an implementation of the requested algorithm | ||
| 687 | * and type, and the second object in the array identifies the provider | ||
| 688 | * of that implementation. | ||
| 689 | * The <code>provider</code> argument can be null, in which case all | ||
| 690 | * configured providers will be searched in order of preference. | ||
| 691 | */ | ||
| 692 | static Object[] getImpl(String algorithm, String type, String provider) | ||
| 693 | throws NoSuchAlgorithmException, NoSuchProviderException { | ||
| 694 | if (provider == null) { | ||
| 695 | return GetInstance.getInstance | ||
| 696 | (type, getSpiClass(type), algorithm).toArray(); | ||
| 697 | } else { | ||
| 698 | return GetInstance.getInstance | ||
| 699 | (type, getSpiClass(type), algorithm, provider).toArray(); | ||
| 700 | } | ||
| 701 | } | ||
| 702 | |||
| 703 | static Object[] getImpl(String algorithm, String type, String provider, | ||
| 704 | Object params) throws NoSuchAlgorithmException, | ||
| 705 | NoSuchProviderException, InvalidAlgorithmParameterException { | ||
| 706 | if (provider == null) { | ||
| 707 | return GetInstance.getInstance | ||
| 708 | (type, getSpiClass(type), algorithm, params).toArray(); | ||
| 709 | } else { | ||
| 710 | return GetInstance.getInstance | ||
| 711 | (type, getSpiClass(type), algorithm, params, provider).toArray(); | ||
| 712 | } | ||
| 713 | } | ||
| 714 | |||
| 715 | /* | ||
| 716 | * Returns an array of objects: the first object in the array is | ||
| 717 | * an instance of an implementation of the requested algorithm | ||
| 718 | * and type, and the second object in the array identifies the provider | ||
| 719 | * of that implementation. | ||
| 720 | * The <code>provider</code> argument cannot be null. | ||
| 721 | */ | ||
| 722 | static Object[] getImpl(String algorithm, String type, Provider provider) | ||
| 723 | throws NoSuchAlgorithmException { | ||
| 724 | return GetInstance.getInstance | ||
| 725 | (type, getSpiClass(type), algorithm, provider).toArray(); | ||
| 726 | } | ||
| 727 | |||
| 728 | static Object[] getImpl(String algorithm, String type, Provider provider, | ||
| 729 | Object params) throws NoSuchAlgorithmException, | ||
| 730 | InvalidAlgorithmParameterException { | ||
| 731 | return GetInstance.getInstance | ||
| 732 | (type, getSpiClass(type), algorithm, params, provider).toArray(); | ||
| 733 | } | ||
| 734 | |||
| 735 | /** | ||
| 736 | * Gets a security property value. | ||
| 737 | * | ||
| 738 | * <p>First, if there is a security manager, its | ||
| 739 | * <code>checkPermission</code> method is called with a | ||
| 740 | * <code>java.security.SecurityPermission("getProperty."+key)</code> | ||
| 741 | * permission to see if it's ok to retrieve the specified | ||
| 742 | * security property value.. | ||
| 743 | * | ||
| 744 | * @param key the key of the property being retrieved. | ||
| 745 | * | ||
| 746 | * @return the value of the security property corresponding to key. | ||
| 747 | * | ||
| 748 | * @throws SecurityException | ||
| 749 | * if a security manager exists and its <code>{@link | ||
| 750 | * java.lang.SecurityManager#checkPermission}</code> method | ||
| 751 | * denies | ||
| 752 | * access to retrieve the specified security property value | ||
| 753 | * @throws NullPointerException is key is null | ||
| 754 | * | ||
| 755 | * @see #setProperty | ||
| 756 | * @see java.security.SecurityPermission | ||
| 757 | */ | ||
| 758 | public static String getProperty(String key) { | ||
| 759 | SecurityManager sm = System.getSecurityManager(); | ||
| 760 | if (sm != null) { | ||
| 761 | sm.checkPermission(new SecurityPermission("getProperty."+ | ||
| 762 | key)); | ||
| 763 | } | ||
| 764 | String name = props.getProperty(key); | ||
| 765 | if (name != null) | ||
| 766 | name = name.trim(); // could be a class name with trailing ws | ||
| 767 | return name; | ||
| 768 | } | ||
| 769 | |||
| 770 | /** | ||
| 771 | * Sets a security property value. | ||
| 772 | * | ||
| 773 | * <p>First, if there is a security manager, its | ||
| 774 | * <code>checkPermission</code> method is called with a | ||
| 775 | * <code>java.security.SecurityPermission("setProperty."+key)</code> | ||
| 776 | * permission to see if it's ok to set the specified | ||
| 777 | * security property value. | ||
| 778 | * | ||
| 779 | * @param key the name of the property to be set. | ||
| 780 | * | ||
| 781 | * @param datum the value of the property to be set. | ||
| 782 | * | ||
| 783 | * @throws SecurityException | ||
| 784 | * if a security manager exists and its <code>{@link | ||
| 785 | * java.lang.SecurityManager#checkPermission}</code> method | ||
| 786 | * denies access to set the specified security property value | ||
| 787 | * @throws NullPointerException if key or datum is null | ||
| 788 | * | ||
| 789 | * @see #getProperty | ||
| 790 | * @see java.security.SecurityPermission | ||
| 791 | */ | ||
| 792 | public static void setProperty(String key, String datum) { | ||
| 793 | check("setProperty."+key); | ||
| 794 | props.put(key, datum); | ||
| 795 | invalidateSMCache(key); /* See below. */ | ||
| 796 | } | ||
| 797 | |||
| 798 | /* | ||
| 799 | * Implementation detail: If the property we just set in | ||
| 800 | * setProperty() was either "package.access" or | ||
| 801 | * "package.definition", we need to signal to the SecurityManager | ||
| 802 | * class that the value has just changed, and that it should | ||
| 803 | * invalidate it's local cache values. | ||
| 804 | * | ||
| 805 | * Rather than create a new API entry for this function, | ||
| 806 | * we use reflection to set a private variable. | ||
| 807 | */ | ||
| 808 | private static void invalidateSMCache(String key) { | ||
| 809 | |||
| 810 | final boolean pa = key.equals("package.access"); | ||
| 811 | final boolean pd = key.equals("package.definition"); | ||
| 812 | |||
| 813 | if (pa || pd) { | ||
| 814 | AccessController.doPrivileged(new PrivilegedAction<Void>() { | ||
| 815 | public Void run() { | ||
| 816 | try { | ||
| 817 | /* Get the class via the bootstrap class loader. */ | ||
| 818 | Class cl = Class.forName( | ||
| 819 | "java.lang.SecurityManager", false, null); | ||
| 820 | Field f = null; | ||
| 821 | boolean accessible = false; | ||
| 822 | |||
| 823 | if (pa) { | ||
| 824 | f = cl.getDeclaredField("packageAccessValid"); | ||
| 825 | accessible = f.isAccessible(); | ||
| 826 | f.setAccessible(true); | ||
| 827 | } else { | ||
| 828 | f = cl.getDeclaredField("packageDefinitionValid"); | ||
| 829 | accessible = f.isAccessible(); | ||
| 830 | f.setAccessible(true); | ||
| 831 | } | ||
| 832 | f.setBoolean(f, false); | ||
| 833 | f.setAccessible(accessible); | ||
| 834 | } | ||
| 835 | catch (Exception e1) { | ||
| 836 | /* If we couldn't get the class, it hasn't | ||
| 837 | * been loaded yet. If there is no such | ||
| 838 | * field, we shouldn't try to set it. There | ||
| 839 | * shouldn't be a security execption, as we | ||
| 840 | * are loaded by boot class loader, and we | ||
| 841 | * are inside a doPrivileged() here. | ||
| 842 | * | ||
| 843 | * NOOP: don't do anything... | ||
| 844 | */ | ||
| 845 | } | ||
| 846 | return null; | ||
| 847 | } /* run */ | ||
| 848 | }); /* PrivilegedAction */ | ||
| 849 | } /* if */ | ||
| 850 | } | ||
| 851 | |||
| 852 | private static void check(String directive) { | ||
| 853 | SecurityManager security = System.getSecurityManager(); | ||
| 854 | if (security != null) { | ||
| 855 | security.checkSecurityAccess(directive); | ||
| 856 | } | ||
| 857 | } | ||
| 858 | |||
| 859 | /* | ||
| 860 | * Returns all providers who satisfy the specified | ||
| 861 | * criterion. | ||
| 862 | */ | ||
| 863 | private static LinkedHashSet<Provider> getAllQualifyingCandidates( | ||
| 864 | String filterKey, | ||
| 865 | String filterValue, | ||
| 866 | Provider[] allProviders) { | ||
| 867 | String[] filterComponents = getFilterComponents(filterKey, | ||
| 868 | filterValue); | ||
| 869 | |||
| 870 | // The first component is the service name. | ||
| 871 | // The second is the algorithm name. | ||
| 872 | // If the third isn't null, that is the attrinute name. | ||
| 873 | String serviceName = filterComponents[0]; | ||
| 874 | String algName = filterComponents[1]; | ||
| 875 | String attrName = filterComponents[2]; | ||
| 876 | |||
| 877 | return getProvidersNotUsingCache(serviceName, algName, attrName, | ||
| 878 | filterValue, allProviders); | ||
| 879 | } | ||
| 880 | |||
| 881 | private static LinkedHashSet<Provider> getProvidersNotUsingCache( | ||
| 882 | String serviceName, | ||
| 883 | String algName, | ||
| 884 | String attrName, | ||
| 885 | String filterValue, | ||
| 886 | Provider[] allProviders) { | ||
| 887 | LinkedHashSet<Provider> candidates = new LinkedHashSet<>(5); | ||
| 888 | for (int i = 0; i < allProviders.length; i++) { | ||
| 889 | if (isCriterionSatisfied(allProviders[i], serviceName, | ||
| 890 | algName, | ||
| 891 | attrName, filterValue)) { | ||
| 892 | candidates.add(allProviders[i]); | ||
| 893 | } | ||
| 894 | } | ||
| 895 | return candidates; | ||
| 896 | } | ||
| 897 | |||
| 898 | /* | ||
| 899 | * Returns true if the given provider satisfies | ||
| 900 | * the selection criterion key:value. | ||
| 901 | */ | ||
| 902 | private static boolean isCriterionSatisfied(Provider prov, | ||
| 903 | String serviceName, | ||
| 904 | String algName, | ||
| 905 | String attrName, | ||
| 906 | String filterValue) { | ||
| 907 | String key = serviceName + '.' + algName; | ||
| 908 | |||
| 909 | if (attrName != null) { | ||
| 910 | key += ' ' + attrName; | ||
| 911 | } | ||
| 912 | // Check whether the provider has a property | ||
| 913 | // whose key is the same as the given key. | ||
| 914 | String propValue = getProviderProperty(key, prov); | ||
| 915 | |||
| 916 | if (propValue == null) { | ||
| 917 | // Check whether we have an alias instead | ||
| 918 | // of a standard name in the key. | ||
| 919 | String standardName = getProviderProperty("Alg.Alias." + | ||
| 920 | serviceName + "." + | ||
| 921 | algName, | ||
| 922 | prov); | ||
| 923 | if (standardName != null) { | ||
| 924 | key = serviceName + "." + standardName; | ||
| 925 | |||
| 926 | if (attrName != null) { | ||
| 927 | key += ' ' + attrName; | ||
| 928 | } | ||
| 929 | |||
| 930 | propValue = getProviderProperty(key, prov); | ||
| 931 | } | ||
| 932 | |||
| 933 | if (propValue == null) { | ||
| 934 | // The provider doesn't have the given | ||
| 935 | // key in its property list. | ||
| 936 | return false; | ||
| 937 | } | ||
| 938 | } | ||
| 939 | |||
| 940 | // If the key is in the format of: | ||
| 941 | // <crypto_service>.<algorithm_or_type>, | ||
| 942 | // there is no need to check the value. | ||
| 943 | |||
| 944 | if (attrName == null) { | ||
| 945 | return true; | ||
| 946 | } | ||
| 947 | |||
| 948 | // If we get here, the key must be in the | ||
| 949 | // format of <crypto_service>.<algorithm_or_provider> <attribute_name>. | ||
| 950 | if (isStandardAttr(attrName)) { | ||
| 951 | return isConstraintSatisfied(attrName, filterValue, propValue); | ||
| 952 | } else { | ||
| 953 | return filterValue.equalsIgnoreCase(propValue); | ||
| 954 | } | ||
| 955 | } | ||
| 956 | |||
| 957 | /* | ||
| 958 | * Returns true if the attribute is a standard attribute; | ||
| 959 | * otherwise, returns false. | ||
| 960 | */ | ||
| 961 | private static boolean isStandardAttr(String attribute) { | ||
| 962 | // For now, we just have two standard attributes: | ||
| 963 | // KeySize and ImplementedIn. | ||
| 964 | if (attribute.equalsIgnoreCase("KeySize")) | ||
| 965 | return true; | ||
| 966 | |||
| 967 | if (attribute.equalsIgnoreCase("ImplementedIn")) | ||
| 968 | return true; | ||
| 969 | |||
| 970 | return false; | ||
| 971 | } | ||
| 972 | |||
| 973 | /* | ||
| 974 | * Returns true if the requested attribute value is supported; | ||
| 975 | * otherwise, returns false. | ||
| 976 | */ | ||
| 977 | private static boolean isConstraintSatisfied(String attribute, | ||
| 978 | String value, | ||
| 979 | String prop) { | ||
| 980 | // For KeySize, prop is the max key size the | ||
| 981 | // provider supports for a specific <crypto_service>.<algorithm>. | ||
| 982 | if (attribute.equalsIgnoreCase("KeySize")) { | ||
| 983 | int requestedSize = Integer.parseInt(value); | ||
| 984 | int maxSize = Integer.parseInt(prop); | ||
| 985 | if (requestedSize <= maxSize) { | ||
| 986 | return true; | ||
| 987 | } else { | ||
| 988 | return false; | ||
| 989 | } | ||
| 990 | } | ||
| 991 | |||
| 992 | // For Type, prop is the type of the implementation | ||
| 993 | // for a specific <crypto service>.<algorithm>. | ||
| 994 | if (attribute.equalsIgnoreCase("ImplementedIn")) { | ||
| 995 | return value.equalsIgnoreCase(prop); | ||
| 996 | } | ||
| 997 | |||
| 998 | return false; | ||
| 999 | } | ||
| 1000 | |||
| 1001 | static String[] getFilterComponents(String filterKey, String filterValue) { | ||
| 1002 | int algIndex = filterKey.indexOf('.'); | ||
| 1003 | |||
| 1004 | if (algIndex < 0) { | ||
| 1005 | // There must be a dot in the filter, and the dot | ||
| 1006 | // shouldn't be at the beginning of this string. | ||
| 1007 | throw new InvalidParameterException("Invalid filter"); | ||
| 1008 | } | ||
| 1009 | |||
| 1010 | String serviceName = filterKey.substring(0, algIndex); | ||
| 1011 | String algName = null; | ||
| 1012 | String attrName = null; | ||
| 1013 | |||
| 1014 | if (filterValue.length() == 0) { | ||
| 1015 | // The filterValue is an empty string. So the filterKey | ||
| 1016 | // should be in the format of <crypto_service>.<algorithm_or_type>. | ||
| 1017 | algName = filterKey.substring(algIndex + 1).trim(); | ||
| 1018 | if (algName.length() == 0) { | ||
| 1019 | // There must be a algorithm or type name. | ||
| 1020 | throw new InvalidParameterException("Invalid filter"); | ||
| 1021 | } | ||
| 1022 | } else { | ||
| 1023 | // The filterValue is a non-empty string. So the filterKey must be | ||
| 1024 | // in the format of | ||
| 1025 | // <crypto_service>.<algorithm_or_type> <attribute_name> | ||
| 1026 | int attrIndex = filterKey.indexOf(' '); | ||
| 1027 | |||
| 1028 | if (attrIndex == -1) { | ||
| 1029 | // There is no attribute name in the filter. | ||
| 1030 | throw new InvalidParameterException("Invalid filter"); | ||
| 1031 | } else { | ||
| 1032 | attrName = filterKey.substring(attrIndex + 1).trim(); | ||
| 1033 | if (attrName.length() == 0) { | ||
| 1034 | // There is no attribute name in the filter. | ||
| 1035 | throw new InvalidParameterException("Invalid filter"); | ||
| 1036 | } | ||
| 1037 | } | ||
| 1038 | |||
| 1039 | // There must be an algorithm name in the filter. | ||
| 1040 | if ((attrIndex < algIndex) || | ||
| 1041 | (algIndex == attrIndex - 1)) { | ||
| 1042 | throw new InvalidParameterException("Invalid filter"); | ||
| 1043 | } else { | ||
| 1044 | algName = filterKey.substring(algIndex + 1, attrIndex); | ||
| 1045 | } | ||
| 1046 | } | ||
| 1047 | |||
| 1048 | String[] result = new String[3]; | ||
| 1049 | result[0] = serviceName; | ||
| 1050 | result[1] = algName; | ||
| 1051 | result[2] = attrName; | ||
| 1052 | |||
| 1053 | return result; | ||
| 1054 | } | ||
| 1055 | |||
| 1056 | /** | ||
| 1057 | * Returns a Set of Strings containing the names of all available | ||
| 1058 | * algorithms or types for the specified Java cryptographic service | ||
| 1059 | * (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore). Returns | ||
| 1060 | * an empty Set if there is no provider that supports the | ||
| 1061 | * specified service or if serviceName is null. For a complete list | ||
| 1062 | * of Java cryptographic services, please see the | ||
| 1063 | * <a href="../../../technotes/guides/security/crypto/CryptoSpec.html">Java | ||
| 1064 | * Cryptography Architecture API Specification & Reference</a>. | ||
| 1065 | * Note: the returned set is immutable. | ||
| 1066 | * | ||
| 1067 | * @param serviceName the name of the Java cryptographic | ||
| 1068 | * service (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore). | ||
| 1069 | * Note: this parameter is case-insensitive. | ||
| 1070 | * | ||
| 1071 | * @return a Set of Strings containing the names of all available | ||
| 1072 | * algorithms or types for the specified Java cryptographic service | ||
| 1073 | * or an empty set if no provider supports the specified service. | ||
| 1074 | * | ||
| 1075 | * @since 1.4 | ||
| 1076 | **/ | ||
| 1077 | public static Set<String> getAlgorithms(String serviceName) { | ||
| 1078 | |||
| 1079 | if ((serviceName == null) || (serviceName.length() == 0) || | ||
| 1080 | (serviceName.endsWith("."))) { | ||
| 1081 | return Collections.EMPTY_SET; | ||
| 1082 | } | ||
| 1083 | |||
| 1084 | HashSet<String> result = new HashSet<>(); | ||
| 1085 | Provider[] providers = Security.getProviders(); | ||
| 1086 | |||
| 1087 | for (int i = 0; i < providers.length; i++) { | ||
| 1088 | // Check the keys for each provider. | ||
| 1089 | for (Enumeration<Object> e = providers[i].keys(); | ||
| 1090 | e.hasMoreElements(); ) { | ||
| 1091 | String currentKey = ((String)e.nextElement()).toUpperCase(); | ||
| 1092 | if (currentKey.startsWith(serviceName.toUpperCase())) { | ||
| 1093 | // We should skip the currentKey if it contains a | ||
| 1094 | // whitespace. The reason is: such an entry in the | ||
| 1095 | // provider property contains attributes for the | ||
| 1096 | // implementation of an algorithm. We are only interested | ||
| 1097 | // in entries which lead to the implementation | ||
| 1098 | // classes. | ||
| 1099 | if (currentKey.indexOf(" ") < 0) { | ||
| 1100 | result.add(currentKey.substring(serviceName.length() + 1)); | ||
| 1101 | } | ||
| 1102 | } | ||
| 1103 | } | ||
| 1104 | } | ||
| 1105 | return Collections.unmodifiableSet(result); | ||
| 1106 | } | ||
| 1107 | } | ||