2
|
1 |
/*
|
|
2 |
* Copyright 1996-2006 Sun Microsystems, Inc. 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. Sun designates this
|
|
8 |
* particular file as subject to the "Classpath" exception as provided
|
|
9 |
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
22 |
* CA 95054 USA or visit www.sun.com if you need additional information or
|
|
23 |
* have any 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 Appendix A in the <a href=
|
|
281 |
* "../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
|
|
282 |
* Java Cryptography Architecture API Specification & Reference </a>
|
|
283 |
* for information about standard algorithm names.
|
|
284 |
* One possible use is by specialized algorithm parsers, which may map
|
|
285 |
* classes to algorithms which they understand (much like Key parsers
|
|
286 |
* do).
|
|
287 |
*
|
|
288 |
* @param algName the algorithm name.
|
|
289 |
*
|
|
290 |
* @param propName the name of the property to get.
|
|
291 |
*
|
|
292 |
* @return the value of the specified property.
|
|
293 |
*
|
|
294 |
* @deprecated This method used to return the value of a proprietary
|
|
295 |
* property in the master file of the "SUN" Cryptographic Service
|
|
296 |
* Provider in order to determine how to parse algorithm-specific
|
|
297 |
* parameters. Use the new provider-based and algorithm-independent
|
|
298 |
* <code>AlgorithmParameters</code> and <code>KeyFactory</code> engine
|
|
299 |
* classes (introduced in the J2SE version 1.2 platform) instead.
|
|
300 |
*/
|
|
301 |
@Deprecated
|
|
302 |
public static String getAlgorithmProperty(String algName,
|
|
303 |
String propName) {
|
|
304 |
ProviderProperty entry = getProviderProperty("Alg." + propName
|
|
305 |
+ "." + algName);
|
|
306 |
if (entry != null) {
|
|
307 |
return entry.className;
|
|
308 |
} else {
|
|
309 |
return null;
|
|
310 |
}
|
|
311 |
}
|
|
312 |
|
|
313 |
/**
|
|
314 |
* Adds a new provider, at a specified position. The position is
|
|
315 |
* the preference order in which providers are searched for
|
|
316 |
* requested algorithms. The position is 1-based, that is,
|
|
317 |
* 1 is most preferred, followed by 2, and so on.
|
|
318 |
*
|
|
319 |
* <p>If the given provider is installed at the requested position,
|
|
320 |
* the provider that used to be at that position, and all providers
|
|
321 |
* with a position greater than <code>position</code>, are shifted up
|
|
322 |
* one position (towards the end of the list of installed providers).
|
|
323 |
*
|
|
324 |
* <p>A provider cannot be added if it is already installed.
|
|
325 |
*
|
|
326 |
* <p>First, if there is a security manager, its
|
|
327 |
* <code>checkSecurityAccess</code>
|
|
328 |
* method is called with the string
|
|
329 |
* <code>"insertProvider."+provider.getName()</code>
|
|
330 |
* to see if it's ok to add a new provider.
|
|
331 |
* If the default implementation of <code>checkSecurityAccess</code>
|
|
332 |
* is used (i.e., that method is not overriden), then this will result in
|
|
333 |
* a call to the security manager's <code>checkPermission</code> method
|
|
334 |
* with a
|
|
335 |
* <code>SecurityPermission("insertProvider."+provider.getName())</code>
|
|
336 |
* permission.
|
|
337 |
*
|
|
338 |
* @param provider the provider to be added.
|
|
339 |
*
|
|
340 |
* @param position the preference position that the caller would
|
|
341 |
* like for this provider.
|
|
342 |
*
|
|
343 |
* @return the actual preference position in which the provider was
|
|
344 |
* added, or -1 if the provider was not added because it is
|
|
345 |
* already installed.
|
|
346 |
*
|
|
347 |
* @throws NullPointerException if provider is null
|
|
348 |
* @throws SecurityException
|
|
349 |
* if a security manager exists and its <code>{@link
|
|
350 |
* java.lang.SecurityManager#checkSecurityAccess}</code> method
|
|
351 |
* denies access to add a new provider
|
|
352 |
*
|
|
353 |
* @see #getProvider
|
|
354 |
* @see #removeProvider
|
|
355 |
* @see java.security.SecurityPermission
|
|
356 |
*/
|
|
357 |
public static synchronized int insertProviderAt(Provider provider,
|
|
358 |
int position) {
|
|
359 |
String providerName = provider.getName();
|
|
360 |
check("insertProvider." + providerName);
|
|
361 |
ProviderList list = Providers.getFullProviderList();
|
|
362 |
ProviderList newList = ProviderList.insertAt(list, provider, position - 1);
|
|
363 |
if (list == newList) {
|
|
364 |
return -1;
|
|
365 |
}
|
|
366 |
Providers.setProviderList(newList);
|
|
367 |
return newList.getIndex(providerName) + 1;
|
|
368 |
}
|
|
369 |
|
|
370 |
/**
|
|
371 |
* Adds a provider to the next position available.
|
|
372 |
*
|
|
373 |
* <p>First, if there is a security manager, its
|
|
374 |
* <code>checkSecurityAccess</code>
|
|
375 |
* method is called with the string
|
|
376 |
* <code>"insertProvider."+provider.getName()</code>
|
|
377 |
* to see if it's ok to add a new provider.
|
|
378 |
* If the default implementation of <code>checkSecurityAccess</code>
|
|
379 |
* is used (i.e., that method is not overriden), then this will result in
|
|
380 |
* a call to the security manager's <code>checkPermission</code> method
|
|
381 |
* with a
|
|
382 |
* <code>SecurityPermission("insertProvider."+provider.getName())</code>
|
|
383 |
* permission.
|
|
384 |
*
|
|
385 |
* @param provider the provider to be added.
|
|
386 |
*
|
|
387 |
* @return the preference position in which the provider was
|
|
388 |
* added, or -1 if the provider was not added because it is
|
|
389 |
* already installed.
|
|
390 |
*
|
|
391 |
* @throws NullPointerException if provider is null
|
|
392 |
* @throws SecurityException
|
|
393 |
* if a security manager exists and its <code>{@link
|
|
394 |
* java.lang.SecurityManager#checkSecurityAccess}</code> method
|
|
395 |
* denies access to add a new provider
|
|
396 |
*
|
|
397 |
* @see #getProvider
|
|
398 |
* @see #removeProvider
|
|
399 |
* @see java.security.SecurityPermission
|
|
400 |
*/
|
|
401 |
public static int addProvider(Provider provider) {
|
|
402 |
/*
|
|
403 |
* We can't assign a position here because the statically
|
|
404 |
* registered providers may not have been installed yet.
|
|
405 |
* insertProviderAt() will fix that value after it has
|
|
406 |
* loaded the static providers.
|
|
407 |
*/
|
|
408 |
return insertProviderAt(provider, 0);
|
|
409 |
}
|
|
410 |
|
|
411 |
/**
|
|
412 |
* Removes the provider with the specified name.
|
|
413 |
*
|
|
414 |
* <p>When the specified provider is removed, all providers located
|
|
415 |
* at a position greater than where the specified provider was are shifted
|
|
416 |
* down one position (towards the head of the list of installed
|
|
417 |
* providers).
|
|
418 |
*
|
|
419 |
* <p>This method returns silently if the provider is not installed or
|
|
420 |
* if name is null.
|
|
421 |
*
|
|
422 |
* <p>First, if there is a security manager, its
|
|
423 |
* <code>checkSecurityAccess</code>
|
|
424 |
* method is called with the string <code>"removeProvider."+name</code>
|
|
425 |
* to see if it's ok to remove the provider.
|
|
426 |
* If the default implementation of <code>checkSecurityAccess</code>
|
|
427 |
* is used (i.e., that method is not overriden), then this will result in
|
|
428 |
* a call to the security manager's <code>checkPermission</code> method
|
|
429 |
* with a <code>SecurityPermission("removeProvider."+name)</code>
|
|
430 |
* permission.
|
|
431 |
*
|
|
432 |
* @param name the name of the provider to remove.
|
|
433 |
*
|
|
434 |
* @throws SecurityException
|
|
435 |
* if a security manager exists and its <code>{@link
|
|
436 |
* java.lang.SecurityManager#checkSecurityAccess}</code> method
|
|
437 |
* denies
|
|
438 |
* access to remove the provider
|
|
439 |
*
|
|
440 |
* @see #getProvider
|
|
441 |
* @see #addProvider
|
|
442 |
*/
|
|
443 |
public static synchronized void removeProvider(String name) {
|
|
444 |
check("removeProvider." + name);
|
|
445 |
ProviderList list = Providers.getFullProviderList();
|
|
446 |
ProviderList newList = ProviderList.remove(list, name);
|
|
447 |
Providers.setProviderList(newList);
|
|
448 |
}
|
|
449 |
|
|
450 |
/**
|
|
451 |
* Returns an array containing all the installed providers. The order of
|
|
452 |
* the providers in the array is their preference order.
|
|
453 |
*
|
|
454 |
* @return an array of all the installed providers.
|
|
455 |
*/
|
|
456 |
public static Provider[] getProviders() {
|
|
457 |
return Providers.getFullProviderList().toArray();
|
|
458 |
}
|
|
459 |
|
|
460 |
/**
|
|
461 |
* Returns the provider installed with the specified name, if
|
|
462 |
* any. Returns null if no provider with the specified name is
|
|
463 |
* installed or if name is null.
|
|
464 |
*
|
|
465 |
* @param name the name of the provider to get.
|
|
466 |
*
|
|
467 |
* @return the provider of the specified name.
|
|
468 |
*
|
|
469 |
* @see #removeProvider
|
|
470 |
* @see #addProvider
|
|
471 |
*/
|
|
472 |
public static Provider getProvider(String name) {
|
|
473 |
return Providers.getProviderList().getProvider(name);
|
|
474 |
}
|
|
475 |
|
|
476 |
/**
|
|
477 |
* Returns an array containing all installed providers that satisfy the
|
|
478 |
* specified selection criterion, or null if no such providers have been
|
|
479 |
* installed. The returned providers are ordered
|
|
480 |
* according to their <a href=
|
|
481 |
* "#insertProviderAt(java.security.Provider, int)">preference order</a>.
|
|
482 |
*
|
|
483 |
* <p> A cryptographic service is always associated with a particular
|
|
484 |
* algorithm or type. For example, a digital signature service is
|
|
485 |
* always associated with a particular algorithm (e.g., DSA),
|
|
486 |
* and a CertificateFactory service is always associated with
|
|
487 |
* a particular certificate type (e.g., X.509).
|
|
488 |
*
|
|
489 |
* <p>The selection criterion must be specified in one of the following two
|
|
490 |
* formats:
|
|
491 |
* <ul>
|
|
492 |
* <li> <i><crypto_service>.<algorithm_or_type></i> <p> The
|
|
493 |
* cryptographic service name must not contain any dots.
|
|
494 |
* <p> A
|
|
495 |
* provider satisfies the specified selection criterion iff the provider
|
|
496 |
* implements the
|
|
497 |
* specified algorithm or type for the specified cryptographic service.
|
|
498 |
* <p> For example, "CertificateFactory.X.509"
|
|
499 |
* would be satisfied by any provider that supplied
|
|
500 |
* a CertificateFactory implementation for X.509 certificates.
|
|
501 |
* <li> <i><crypto_service>.<algorithm_or_type>
|
|
502 |
* <attribute_name>:< attribute_value></i>
|
|
503 |
* <p> The cryptographic service name must not contain any dots. There
|
2589
|
504 |
* must be one or more space charaters between the
|
2
|
505 |
* <i><algorithm_or_type></i> and the <i><attribute_name></i>.
|
|
506 |
* <p> A provider satisfies this selection criterion iff the
|
|
507 |
* provider implements the specified algorithm or type for the specified
|
|
508 |
* cryptographic service and its implementation meets the
|
|
509 |
* constraint expressed by the specified attribute name/value pair.
|
|
510 |
* <p> For example, "Signature.SHA1withDSA KeySize:1024" would be
|
|
511 |
* satisfied by any provider that implemented
|
|
512 |
* the SHA1withDSA signature algorithm with a keysize of 1024 (or larger).
|
|
513 |
*
|
|
514 |
* </ul>
|
|
515 |
*
|
|
516 |
* <p> See Appendix A in the <a href=
|
|
517 |
* "../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
|
|
518 |
* Java Cryptography Architecture API Specification & Reference </a>
|
|
519 |
* for information about standard cryptographic service names, standard
|
|
520 |
* algorithm names and standard attribute names.
|
|
521 |
*
|
|
522 |
* @param filter the criterion for selecting
|
|
523 |
* providers. The filter is case-insensitive.
|
|
524 |
*
|
|
525 |
* @return all the installed providers that satisfy the selection
|
|
526 |
* criterion, or null if no such providers have been installed.
|
|
527 |
*
|
|
528 |
* @throws InvalidParameterException
|
|
529 |
* if the filter is not in the required format
|
|
530 |
* @throws NullPointerException if filter is null
|
|
531 |
*
|
|
532 |
* @see #getProviders(java.util.Map)
|
|
533 |
* @since 1.3
|
|
534 |
*/
|
|
535 |
public static Provider[] getProviders(String filter) {
|
|
536 |
String key = null;
|
|
537 |
String value = null;
|
|
538 |
int index = filter.indexOf(':');
|
|
539 |
|
|
540 |
if (index == -1) {
|
|
541 |
key = filter;
|
|
542 |
value = "";
|
|
543 |
} else {
|
|
544 |
key = filter.substring(0, index);
|
|
545 |
value = filter.substring(index + 1);
|
|
546 |
}
|
|
547 |
|
|
548 |
Hashtable<String, String> hashtableFilter =
|
|
549 |
new Hashtable<String, String>(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 Appendix A in the <a href=
|
|
586 |
* "../../../technotes/guides/security/crypto/CryptoSpec.html#AppA">
|
|
587 |
* Java Cryptography Architecture API Specification & Reference </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<Provider>(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 =
|
|
664 |
new ConcurrentHashMap<String,Class>();
|
|
665 |
|
|
666 |
/**
|
|
667 |
* Return the Class object for the given engine type
|
|
668 |
* (e.g. "MessageDigest"). Works for Spis in the java.security package
|
|
669 |
* only.
|
|
670 |
*/
|
|
671 |
private static Class getSpiClass(String type) {
|
|
672 |
Class clazz = spiMap.get(type);
|
|
673 |
if (clazz != null) {
|
|
674 |
return clazz;
|
|
675 |
}
|
|
676 |
try {
|
|
677 |
clazz = Class.forName("java.security." + type + "Spi");
|
|
678 |
spiMap.put(type, clazz);
|
|
679 |
return clazz;
|
|
680 |
} catch (ClassNotFoundException e) {
|
|
681 |
throw (Error)new AssertionError("Spi class not found").initCause(e);
|
|
682 |
}
|
|
683 |
}
|
|
684 |
|
|
685 |
/*
|
|
686 |
* Returns an array of objects: the first object in the array is
|
|
687 |
* an instance of an implementation of the requested algorithm
|
|
688 |
* and type, and the second object in the array identifies the provider
|
|
689 |
* of that implementation.
|
|
690 |
* The <code>provider</code> argument can be null, in which case all
|
|
691 |
* configured providers will be searched in order of preference.
|
|
692 |
*/
|
|
693 |
static Object[] getImpl(String algorithm, String type, String provider)
|
|
694 |
throws NoSuchAlgorithmException, NoSuchProviderException {
|
|
695 |
if (provider == null) {
|
|
696 |
return GetInstance.getInstance
|
|
697 |
(type, getSpiClass(type), algorithm).toArray();
|
|
698 |
} else {
|
|
699 |
return GetInstance.getInstance
|
|
700 |
(type, getSpiClass(type), algorithm, provider).toArray();
|
|
701 |
}
|
|
702 |
}
|
|
703 |
|
|
704 |
static Object[] getImpl(String algorithm, String type, String provider,
|
|
705 |
Object params) throws NoSuchAlgorithmException,
|
|
706 |
NoSuchProviderException, InvalidAlgorithmParameterException {
|
|
707 |
if (provider == null) {
|
|
708 |
return GetInstance.getInstance
|
|
709 |
(type, getSpiClass(type), algorithm, params).toArray();
|
|
710 |
} else {
|
|
711 |
return GetInstance.getInstance
|
|
712 |
(type, getSpiClass(type), algorithm, params, provider).toArray();
|
|
713 |
}
|
|
714 |
}
|
|
715 |
|
|
716 |
/*
|
|
717 |
* Returns an array of objects: the first object in the array is
|
|
718 |
* an instance of an implementation of the requested algorithm
|
|
719 |
* and type, and the second object in the array identifies the provider
|
|
720 |
* of that implementation.
|
|
721 |
* The <code>provider</code> argument cannot be null.
|
|
722 |
*/
|
|
723 |
static Object[] getImpl(String algorithm, String type, Provider provider)
|
|
724 |
throws NoSuchAlgorithmException {
|
|
725 |
return GetInstance.getInstance
|
|
726 |
(type, getSpiClass(type), algorithm, provider).toArray();
|
|
727 |
}
|
|
728 |
|
|
729 |
static Object[] getImpl(String algorithm, String type, Provider provider,
|
|
730 |
Object params) throws NoSuchAlgorithmException,
|
|
731 |
InvalidAlgorithmParameterException {
|
|
732 |
return GetInstance.getInstance
|
|
733 |
(type, getSpiClass(type), algorithm, params, provider).toArray();
|
|
734 |
}
|
|
735 |
|
|
736 |
/**
|
|
737 |
* Gets a security property value.
|
|
738 |
*
|
|
739 |
* <p>First, if there is a security manager, its
|
|
740 |
* <code>checkPermission</code> method is called with a
|
|
741 |
* <code>java.security.SecurityPermission("getProperty."+key)</code>
|
|
742 |
* permission to see if it's ok to retrieve the specified
|
|
743 |
* security property value..
|
|
744 |
*
|
|
745 |
* @param key the key of the property being retrieved.
|
|
746 |
*
|
|
747 |
* @return the value of the security property corresponding to key.
|
|
748 |
*
|
|
749 |
* @throws SecurityException
|
|
750 |
* if a security manager exists and its <code>{@link
|
|
751 |
* java.lang.SecurityManager#checkPermission}</code> method
|
|
752 |
* denies
|
|
753 |
* access to retrieve the specified security property value
|
|
754 |
* @throws NullPointerException is key is null
|
|
755 |
*
|
|
756 |
* @see #setProperty
|
|
757 |
* @see java.security.SecurityPermission
|
|
758 |
*/
|
|
759 |
public static String getProperty(String key) {
|
|
760 |
SecurityManager sm = System.getSecurityManager();
|
|
761 |
if (sm != null) {
|
|
762 |
sm.checkPermission(new SecurityPermission("getProperty."+
|
|
763 |
key));
|
|
764 |
}
|
|
765 |
String name = props.getProperty(key);
|
|
766 |
if (name != null)
|
|
767 |
name = name.trim(); // could be a class name with trailing ws
|
|
768 |
return name;
|
|
769 |
}
|
|
770 |
|
|
771 |
/**
|
|
772 |
* Sets a security property value.
|
|
773 |
*
|
|
774 |
* <p>First, if there is a security manager, its
|
|
775 |
* <code>checkPermission</code> method is called with a
|
|
776 |
* <code>java.security.SecurityPermission("setProperty."+key)</code>
|
|
777 |
* permission to see if it's ok to set the specified
|
|
778 |
* security property value.
|
|
779 |
*
|
|
780 |
* @param key the name of the property to be set.
|
|
781 |
*
|
|
782 |
* @param datum the value of the property to be set.
|
|
783 |
*
|
|
784 |
* @throws SecurityException
|
|
785 |
* if a security manager exists and its <code>{@link
|
|
786 |
* java.lang.SecurityManager#checkPermission}</code> method
|
|
787 |
* denies access to set the specified security property value
|
|
788 |
* @throws NullPointerException if key or datum is null
|
|
789 |
*
|
|
790 |
* @see #getProperty
|
|
791 |
* @see java.security.SecurityPermission
|
|
792 |
*/
|
|
793 |
public static void setProperty(String key, String datum) {
|
|
794 |
check("setProperty."+key);
|
|
795 |
props.put(key, datum);
|
|
796 |
invalidateSMCache(key); /* See below. */
|
|
797 |
}
|
|
798 |
|
|
799 |
/*
|
|
800 |
* Implementation detail: If the property we just set in
|
|
801 |
* setProperty() was either "package.access" or
|
|
802 |
* "package.definition", we need to signal to the SecurityManager
|
|
803 |
* class that the value has just changed, and that it should
|
|
804 |
* invalidate it's local cache values.
|
|
805 |
*
|
|
806 |
* Rather than create a new API entry for this function,
|
|
807 |
* we use reflection to set a private variable.
|
|
808 |
*/
|
|
809 |
private static void invalidateSMCache(String key) {
|
|
810 |
|
|
811 |
final boolean pa = key.equals("package.access");
|
|
812 |
final boolean pd = key.equals("package.definition");
|
|
813 |
|
|
814 |
if (pa || pd) {
|
|
815 |
AccessController.doPrivileged(new PrivilegedAction<Void>() {
|
|
816 |
public Void run() {
|
|
817 |
try {
|
|
818 |
/* Get the class via the bootstrap class loader. */
|
|
819 |
Class cl = Class.forName(
|
|
820 |
"java.lang.SecurityManager", false, null);
|
|
821 |
Field f = null;
|
|
822 |
boolean accessible = false;
|
|
823 |
|
|
824 |
if (pa) {
|
|
825 |
f = cl.getDeclaredField("packageAccessValid");
|
|
826 |
accessible = f.isAccessible();
|
|
827 |
f.setAccessible(true);
|
|
828 |
} else {
|
|
829 |
f = cl.getDeclaredField("packageDefinitionValid");
|
|
830 |
accessible = f.isAccessible();
|
|
831 |
f.setAccessible(true);
|
|
832 |
}
|
|
833 |
f.setBoolean(f, false);
|
|
834 |
f.setAccessible(accessible);
|
|
835 |
}
|
|
836 |
catch (Exception e1) {
|
|
837 |
/* If we couldn't get the class, it hasn't
|
|
838 |
* been loaded yet. If there is no such
|
|
839 |
* field, we shouldn't try to set it. There
|
|
840 |
* shouldn't be a security execption, as we
|
|
841 |
* are loaded by boot class loader, and we
|
|
842 |
* are inside a doPrivileged() here.
|
|
843 |
*
|
|
844 |
* NOOP: don't do anything...
|
|
845 |
*/
|
|
846 |
}
|
|
847 |
return null;
|
|
848 |
} /* run */
|
|
849 |
}); /* PrivilegedAction */
|
|
850 |
} /* if */
|
|
851 |
}
|
|
852 |
|
|
853 |
private static void check(String directive) {
|
|
854 |
SecurityManager security = System.getSecurityManager();
|
|
855 |
if (security != null) {
|
|
856 |
security.checkSecurityAccess(directive);
|
|
857 |
}
|
|
858 |
}
|
|
859 |
|
|
860 |
/*
|
|
861 |
* Returns all providers who satisfy the specified
|
|
862 |
* criterion.
|
|
863 |
*/
|
|
864 |
private static LinkedHashSet<Provider> getAllQualifyingCandidates(
|
|
865 |
String filterKey,
|
|
866 |
String filterValue,
|
|
867 |
Provider[] allProviders) {
|
|
868 |
String[] filterComponents = getFilterComponents(filterKey,
|
|
869 |
filterValue);
|
|
870 |
|
|
871 |
// The first component is the service name.
|
|
872 |
// The second is the algorithm name.
|
|
873 |
// If the third isn't null, that is the attrinute name.
|
|
874 |
String serviceName = filterComponents[0];
|
|
875 |
String algName = filterComponents[1];
|
|
876 |
String attrName = filterComponents[2];
|
|
877 |
|
|
878 |
return getProvidersNotUsingCache(serviceName, algName, attrName,
|
|
879 |
filterValue, allProviders);
|
|
880 |
}
|
|
881 |
|
|
882 |
private static LinkedHashSet<Provider> getProvidersNotUsingCache(
|
|
883 |
String serviceName,
|
|
884 |
String algName,
|
|
885 |
String attrName,
|
|
886 |
String filterValue,
|
|
887 |
Provider[] allProviders) {
|
|
888 |
LinkedHashSet<Provider> candidates = new LinkedHashSet<Provider>(5);
|
|
889 |
for (int i = 0; i < allProviders.length; i++) {
|
|
890 |
if (isCriterionSatisfied(allProviders[i], serviceName,
|
|
891 |
algName,
|
|
892 |
attrName, filterValue)) {
|
|
893 |
candidates.add(allProviders[i]);
|
|
894 |
}
|
|
895 |
}
|
|
896 |
return candidates;
|
|
897 |
}
|
|
898 |
|
|
899 |
/*
|
|
900 |
* Returns true if the given provider satisfies
|
|
901 |
* the selection criterion key:value.
|
|
902 |
*/
|
|
903 |
private static boolean isCriterionSatisfied(Provider prov,
|
|
904 |
String serviceName,
|
|
905 |
String algName,
|
|
906 |
String attrName,
|
|
907 |
String filterValue) {
|
|
908 |
String key = serviceName + '.' + algName;
|
|
909 |
|
|
910 |
if (attrName != null) {
|
|
911 |
key += ' ' + attrName;
|
|
912 |
}
|
|
913 |
// Check whether the provider has a property
|
|
914 |
// whose key is the same as the given key.
|
|
915 |
String propValue = getProviderProperty(key, prov);
|
|
916 |
|
|
917 |
if (propValue == null) {
|
|
918 |
// Check whether we have an alias instead
|
|
919 |
// of a standard name in the key.
|
|
920 |
String standardName = getProviderProperty("Alg.Alias." +
|
|
921 |
serviceName + "." +
|
|
922 |
algName,
|
|
923 |
prov);
|
|
924 |
if (standardName != null) {
|
|
925 |
key = serviceName + "." + standardName;
|
|
926 |
|
|
927 |
if (attrName != null) {
|
|
928 |
key += ' ' + attrName;
|
|
929 |
}
|
|
930 |
|
|
931 |
propValue = getProviderProperty(key, prov);
|
|
932 |
}
|
|
933 |
|
|
934 |
if (propValue == null) {
|
|
935 |
// The provider doesn't have the given
|
|
936 |
// key in its property list.
|
|
937 |
return false;
|
|
938 |
}
|
|
939 |
}
|
|
940 |
|
|
941 |
// If the key is in the format of:
|
|
942 |
// <crypto_service>.<algorithm_or_type>,
|
|
943 |
// there is no need to check the value.
|
|
944 |
|
|
945 |
if (attrName == null) {
|
|
946 |
return true;
|
|
947 |
}
|
|
948 |
|
|
949 |
// If we get here, the key must be in the
|
|
950 |
// format of <crypto_service>.<algorithm_or_provider> <attribute_name>.
|
|
951 |
if (isStandardAttr(attrName)) {
|
|
952 |
return isConstraintSatisfied(attrName, filterValue, propValue);
|
|
953 |
} else {
|
|
954 |
return filterValue.equalsIgnoreCase(propValue);
|
|
955 |
}
|
|
956 |
}
|
|
957 |
|
|
958 |
/*
|
|
959 |
* Returns true if the attribute is a standard attribute;
|
|
960 |
* otherwise, returns false.
|
|
961 |
*/
|
|
962 |
private static boolean isStandardAttr(String attribute) {
|
|
963 |
// For now, we just have two standard attributes:
|
|
964 |
// KeySize and ImplementedIn.
|
|
965 |
if (attribute.equalsIgnoreCase("KeySize"))
|
|
966 |
return true;
|
|
967 |
|
|
968 |
if (attribute.equalsIgnoreCase("ImplementedIn"))
|
|
969 |
return true;
|
|
970 |
|
|
971 |
return false;
|
|
972 |
}
|
|
973 |
|
|
974 |
/*
|
|
975 |
* Returns true if the requested attribute value is supported;
|
|
976 |
* otherwise, returns false.
|
|
977 |
*/
|
|
978 |
private static boolean isConstraintSatisfied(String attribute,
|
|
979 |
String value,
|
|
980 |
String prop) {
|
|
981 |
// For KeySize, prop is the max key size the
|
|
982 |
// provider supports for a specific <crypto_service>.<algorithm>.
|
|
983 |
if (attribute.equalsIgnoreCase("KeySize")) {
|
|
984 |
int requestedSize = Integer.parseInt(value);
|
|
985 |
int maxSize = Integer.parseInt(prop);
|
|
986 |
if (requestedSize <= maxSize) {
|
|
987 |
return true;
|
|
988 |
} else {
|
|
989 |
return false;
|
|
990 |
}
|
|
991 |
}
|
|
992 |
|
|
993 |
// For Type, prop is the type of the implementation
|
|
994 |
// for a specific <crypto service>.<algorithm>.
|
|
995 |
if (attribute.equalsIgnoreCase("ImplementedIn")) {
|
|
996 |
return value.equalsIgnoreCase(prop);
|
|
997 |
}
|
|
998 |
|
|
999 |
return false;
|
|
1000 |
}
|
|
1001 |
|
|
1002 |
static String[] getFilterComponents(String filterKey, String filterValue) {
|
|
1003 |
int algIndex = filterKey.indexOf('.');
|
|
1004 |
|
|
1005 |
if (algIndex < 0) {
|
|
1006 |
// There must be a dot in the filter, and the dot
|
|
1007 |
// shouldn't be at the beginning of this string.
|
|
1008 |
throw new InvalidParameterException("Invalid filter");
|
|
1009 |
}
|
|
1010 |
|
|
1011 |
String serviceName = filterKey.substring(0, algIndex);
|
|
1012 |
String algName = null;
|
|
1013 |
String attrName = null;
|
|
1014 |
|
|
1015 |
if (filterValue.length() == 0) {
|
|
1016 |
// The filterValue is an empty string. So the filterKey
|
|
1017 |
// should be in the format of <crypto_service>.<algorithm_or_type>.
|
|
1018 |
algName = filterKey.substring(algIndex + 1).trim();
|
|
1019 |
if (algName.length() == 0) {
|
|
1020 |
// There must be a algorithm or type name.
|
|
1021 |
throw new InvalidParameterException("Invalid filter");
|
|
1022 |
}
|
|
1023 |
} else {
|
|
1024 |
// The filterValue is a non-empty string. So the filterKey must be
|
|
1025 |
// in the format of
|
|
1026 |
// <crypto_service>.<algorithm_or_type> <attribute_name>
|
|
1027 |
int attrIndex = filterKey.indexOf(' ');
|
|
1028 |
|
|
1029 |
if (attrIndex == -1) {
|
|
1030 |
// There is no attribute name in the filter.
|
|
1031 |
throw new InvalidParameterException("Invalid filter");
|
|
1032 |
} else {
|
|
1033 |
attrName = filterKey.substring(attrIndex + 1).trim();
|
|
1034 |
if (attrName.length() == 0) {
|
|
1035 |
// There is no attribute name in the filter.
|
|
1036 |
throw new InvalidParameterException("Invalid filter");
|
|
1037 |
}
|
|
1038 |
}
|
|
1039 |
|
|
1040 |
// There must be an algorithm name in the filter.
|
|
1041 |
if ((attrIndex < algIndex) ||
|
|
1042 |
(algIndex == attrIndex - 1)) {
|
|
1043 |
throw new InvalidParameterException("Invalid filter");
|
|
1044 |
} else {
|
|
1045 |
algName = filterKey.substring(algIndex + 1, attrIndex);
|
|
1046 |
}
|
|
1047 |
}
|
|
1048 |
|
|
1049 |
String[] result = new String[3];
|
|
1050 |
result[0] = serviceName;
|
|
1051 |
result[1] = algName;
|
|
1052 |
result[2] = attrName;
|
|
1053 |
|
|
1054 |
return result;
|
|
1055 |
}
|
|
1056 |
|
|
1057 |
/**
|
|
1058 |
* Returns a Set of Strings containing the names of all available
|
|
1059 |
* algorithms or types for the specified Java cryptographic service
|
|
1060 |
* (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore). Returns
|
|
1061 |
* an empty Set if there is no provider that supports the
|
|
1062 |
* specified service or if serviceName is null. For a complete list
|
|
1063 |
* of Java cryptographic services, please see the
|
|
1064 |
* <a href="../../../technotes/guides/security/crypto/CryptoSpec.html">Java
|
|
1065 |
* Cryptography Architecture API Specification & Reference</a>.
|
|
1066 |
* Note: the returned set is immutable.
|
|
1067 |
*
|
|
1068 |
* @param serviceName the name of the Java cryptographic
|
|
1069 |
* service (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore).
|
|
1070 |
* Note: this parameter is case-insensitive.
|
|
1071 |
*
|
|
1072 |
* @return a Set of Strings containing the names of all available
|
|
1073 |
* algorithms or types for the specified Java cryptographic service
|
|
1074 |
* or an empty set if no provider supports the specified service.
|
|
1075 |
*
|
|
1076 |
* @since 1.4
|
|
1077 |
**/
|
|
1078 |
public static Set<String> getAlgorithms(String serviceName) {
|
|
1079 |
|
|
1080 |
if ((serviceName == null) || (serviceName.length() == 0) ||
|
|
1081 |
(serviceName.endsWith("."))) {
|
|
1082 |
return Collections.EMPTY_SET;
|
|
1083 |
}
|
|
1084 |
|
|
1085 |
HashSet<String> result = new HashSet<String>();
|
|
1086 |
Provider[] providers = Security.getProviders();
|
|
1087 |
|
|
1088 |
for (int i = 0; i < providers.length; i++) {
|
|
1089 |
// Check the keys for each provider.
|
|
1090 |
for (Enumeration<Object> e = providers[i].keys();
|
|
1091 |
e.hasMoreElements(); ) {
|
|
1092 |
String currentKey = ((String)e.nextElement()).toUpperCase();
|
|
1093 |
if (currentKey.startsWith(serviceName.toUpperCase())) {
|
|
1094 |
// We should skip the currentKey if it contains a
|
|
1095 |
// whitespace. The reason is: such an entry in the
|
|
1096 |
// provider property contains attributes for the
|
|
1097 |
// implementation of an algorithm. We are only interested
|
|
1098 |
// in entries which lead to the implementation
|
|
1099 |
// classes.
|
|
1100 |
if (currentKey.indexOf(" ") < 0) {
|
|
1101 |
result.add(currentKey.substring(serviceName.length() + 1));
|
|
1102 |
}
|
|
1103 |
}
|
|
1104 |
}
|
|
1105 |
}
|
|
1106 |
return Collections.unmodifiableSet(result);
|
|
1107 |
}
|
|
1108 |
}
|