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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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package javax.crypto;
import java.util.*;
import java.security.*;
import java.security.Provider.Service;
import sun.security.jca.*;
import sun.security.jca.GetInstance.Instance;
/**
* This class instantiates implementations of JCE engine classes from
* providers registered with the java.security.Security object.
*
* @author Jan Luehe
* @author Sharon Liu
* @since 1.4
*/
final class JceSecurity {
// Used in KeyGenerator, Cipher and KeyAgreement.
static final SecureRandom RANDOM = new SecureRandom();
/*
* Don't let anyone instantiate this.
*/
private JceSecurity() {
}
static Instance getInstance(String type, Class clazz, String algorithm,
String provider) throws NoSuchAlgorithmException,
NoSuchProviderException {
Service s = GetInstance.getService(type, algorithm, provider);
return GetInstance.getInstance(s, clazz);
}
static Instance getInstance(String type, Class clazz, String algorithm,
Provider provider) throws NoSuchAlgorithmException {
Service s = GetInstance.getService(type, algorithm, provider);
return GetInstance.getInstance(s, clazz);
}
static Instance getInstance(String type, Class clazz, String algorithm)
throws NoSuchAlgorithmException {
List services = GetInstance.getServices(type, algorithm);
NoSuchAlgorithmException failure = null;
for (Iterator t = services.iterator(); t.hasNext(); ) {
Service s = (Service)t.next();
try {
Instance instance = GetInstance.getInstance(s, clazz);
return instance;
} catch (NoSuchAlgorithmException e) {
failure = e;
}
}
throw new NoSuchAlgorithmException("Algorithm " + algorithm
+ " not available", failure);
}
// Used to return whether this provider is properly signed and
// can be used by JCE. These days just returns true. Still used
// in SecretKeyFactory, KeyGenerator, Mac and KeyAgreement.
static boolean canUseProvider(Provider p) {
return true;
}
}