Bitcoin Core  0.19.99
P2P Digital Currency
Secp256k1Context.java
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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 
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 
41  public static boolean isEnabled() {
42  return enabled;
43  }
44 
45  public static long getContext() {
46  if(!enabled) return -1; //sanity check
47  return context;
48  }
49 
50  private static native long secp256k1_init_context();
51 }
static final boolean enabled
static native long secp256k1_init_context()
This class holds the context reference used in native methods to handle ECDSA operations.