io.jsonwebtoken.lang.RuntimeEnvironment Maven / Gradle / Ivy
/*
* Copyright (C) 2014 jsonwebtoken.io
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.jsonwebtoken.lang;
import java.security.Provider;
import java.security.Security;
import java.util.concurrent.atomic.AtomicBoolean;
public final class RuntimeEnvironment {
private static final RuntimeEnvironment INSTANCE = new RuntimeEnvironment();
private RuntimeEnvironment(){}
private static final String BC_PROVIDER_CLASS_NAME = "org.bouncycastle.jce.provider.BouncyCastleProvider";
private static final AtomicBoolean bcLoaded = new AtomicBoolean(false);
public static final boolean BOUNCY_CASTLE_AVAILABLE = Classes.isAvailable(BC_PROVIDER_CLASS_NAME);
public static void enableBouncyCastleIfPossible() {
if (bcLoaded.get()) {
return;
}
try {
Class clazz = Classes.forName(BC_PROVIDER_CLASS_NAME);
//check to see if the user has already registered the BC provider:
Provider[] providers = Security.getProviders();
for(Provider provider : providers) {
if (clazz.isInstance(provider)) {
bcLoaded.set(true);
return;
}
}
//bc provider not enabled - add it:
Security.addProvider((Provider)Classes.newInstance(clazz));
bcLoaded.set(true);
} catch (UnknownClassException e) {
//not available
}
}
static {
enableBouncyCastleIfPossible();
}
}