1 /*
2  * Copyright 2014-2016 the libsecp256k1 contributors
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *    http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package org.bitcoin;
18 
19 /**
20  * This class holds the context reference used in native methods
21  * to handle ECDSA operations.
22  */
23 public class Secp256k1Context {
24   private static final boolean enabled; //true if the library is loaded
25   private static final long context; //ref to pointer to context obj
26 
27   static { //static initializer
28       boolean isEnabled = true;
29       long contextRef = -1;
30       try {
31           System.loadLibrary("secp256k1");
32           contextRef = secp256k1_init_context();
33       } catch (UnsatisfiedLinkError e) {
34           System.out.println("UnsatisfiedLinkError: " + e.toString());
35           isEnabled = false;
36       }
37       enabled = isEnabled;
38       context = contextRef;
39   }
40 
isEnabled()41   public static boolean isEnabled() {
42      return enabled;
43   }
44 
getContext()45   public static long getContext() {
46      if(!enabled) return -1; //sanity check
47      return context;
48   }
49 
secp256k1_init_context()50   private static native long secp256k1_init_context();
51 }
52