org.bitcoin.Secp256k1Context Maven / Gradle / Ivy
/*
* Copyright 2014-2016 the libsecp256k1 contributors
*
* 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 org.bitcoin;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.security.AccessControlException;
/**
* This class holds the context reference used in native methods to handle ECDSA operations.
*/
public class Secp256k1Context {
private static final boolean enabled; // true if the library is loaded
private static final long context; // ref to pointer to context obj
private static final Logger log = LoggerFactory.getLogger(Secp256k1Context.class);
static { // static initializer
boolean isEnabled = true;
long contextRef = -1;
try {
System.loadLibrary("secp256k1");
contextRef = secp256k1_init_context();
} catch (UnsatisfiedLinkError e) {
log.info(e.toString());
isEnabled = false;
} catch (AccessControlException e) {
log.debug(e.toString());
isEnabled = false;
}
enabled = isEnabled;
context = contextRef;
}
public static boolean isEnabled() {
return enabled;
}
public static long getContext() {
if (!enabled)
return -1; // sanity check
return context;
}
private static native long secp256k1_init_context();
}