/**
* Load the policies from the specified file. Also checks that the policies are correctly signed.
*/
private static void loadPolicies(
File jarPathName, CryptoPermissions defaultPolicy, CryptoPermissions exemptPolicy)
throws Exception {
JarFile jf = new JarFile(jarPathName);
Enumeration<JarEntry> entries = jf.entries();
while (entries.hasMoreElements()) {
JarEntry je = entries.nextElement();
InputStream is = null;
try {
if (je.getName().startsWith("default_")) {
is = jf.getInputStream(je);
defaultPolicy.load(is);
} else if (je.getName().startsWith("exempt_")) {
is = jf.getInputStream(je);
exemptPolicy.load(is);
} else {
continue;
}
} finally {
if (is != null) {
is.close();
}
}
// Enforce the signer restraint, i.e. signer of JCE framework
// jar should also be the signer of the two jurisdiction policy
// jar files.
JarVerifier.verifyPolicySigned(je.getCertificates());
}
// Close and nullify the JarFile reference to help GC.
jf.close();
jf = null;
}
/**
* Returns a Set of Strings containing the names of all available algorithms or types for the
* specified Java cryptographic service (e.g., Signature, MessageDigest, Cipher, Mac, KeyStore).
* Returns an empty Set if there is no provider that supports the specified service or if
* serviceName is null. For a complete list of Java cryptographic services, please see the <a
* href="../../../guide/security/CryptoSpec.html">Java Cryptography Architecture API Specification
* & Reference</a>. Note: the returned set is immutable.
*
* @param serviceName the name of the Java cryptographic service (e.g., Signature, MessageDigest,
* Cipher, Mac, KeyStore). Note: this parameter is case-insensitive.
* @return a Set of Strings containing the names of all available algorithms or types for the
* specified Java cryptographic service or an empty set if no provider supports the specified
* service.
* @since 1.4
*/
public static Set<String> getAlgorithms(String serviceName) {
if ((serviceName == null) || (serviceName.length() == 0) || (serviceName.endsWith("."))) {
return Collections.EMPTY_SET;
}
HashSet result = new HashSet();
Provider[] providers = Security.getProviders();
for (int i = 0; i < providers.length; i++) {
// Check the keys for each provider.
for (Enumeration e = providers[i].keys(); e.hasMoreElements(); ) {
String currentKey = ((String) e.nextElement()).toUpperCase();
if (currentKey.startsWith(serviceName.toUpperCase())) {
// We should skip the currentKey if it contains a
// whitespace. The reason is: such an entry in the
// provider property contains attributes for the
// implementation of an algorithm. We are only interested
// in entries which lead to the implementation
// classes.
if (currentKey.indexOf(" ") < 0) {
result.add(currentKey.substring(serviceName.length() + 1));
}
}
}
}
return Collections.unmodifiableSet(result);
}
/**
* Looks up providers, and returns the property (and its associated provider) mapping the key, if
* any. The order in which the providers are looked up is the provider-preference order, as
* specificed in the security properties file.
*/
private static ProviderProperty getProviderProperty(String key) {
ProviderProperty entry = null;
List providers = Providers.getProviderList().providers();
for (int i = 0; i < providers.size(); i++) {
String matchKey = null;
Provider prov = (Provider) providers.get(i);
String prop = prov.getProperty(key);
if (prop == null) {
// Is there a match if we do a case-insensitive property name
// comparison? Let's try ...
for (Enumeration e = prov.keys(); e.hasMoreElements() && prop == null; ) {
matchKey = (String) e.nextElement();
if (key.equalsIgnoreCase(matchKey)) {
prop = prov.getProperty(matchKey);
break;
}
}
}
if (prop != null) {
ProviderProperty newEntry = new ProviderProperty();
newEntry.className = prop;
newEntry.provider = prov;
return newEntry;
}
}
return entry;
}
/** Returns the property (if any) mapping the key for the given provider. */
private static String getProviderProperty(String key, Provider provider) {
String prop = provider.getProperty(key);
if (prop == null) {
// Is there a match if we do a case-insensitive property name
// comparison? Let's try ...
for (Enumeration e = provider.keys(); e.hasMoreElements() && prop == null; ) {
String matchKey = (String) e.nextElement();
if (key.equalsIgnoreCase(matchKey)) {
prop = provider.getProperty(matchKey);
break;
}
}
}
return prop;
}