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   /*
    * Copyright 2021 The Netty Project
    *
    * The Netty Project licenses this file to you 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:
    *
    *   https://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.netty.handler.ssl;
  
  import javax.net.ssl.SSLEngine;
  
  /**
   * Contains methods that can be used to detect if BouncyCastle is usable.
   */
  final class BouncyCastle {
  
      private static final boolean BOUNCY_CASTLE_ON_CLASSPATH;
  
      static {
          boolean bcOnClasspath = false;
          try {
              Class.forName("org.bouncycastle.jsse.provider.BouncyCastleJsseProvider");
              bcOnClasspath = true;
          } catch (Throwable ignore) {
              // ignore
          }
          BOUNCY_CASTLE_ON_CLASSPATH = bcOnClasspath;
      }
  
      /**
       * Indicates whether or not BouncyCastle is available on the current system.
       */
      static boolean isAvailable() {
          return BOUNCY_CASTLE_ON_CLASSPATH;
      }
  
      /**
       * Indicates whether or not BouncyCastle is the underlying SSLEngine.
       */
      static boolean isInUse(SSLEngine engine) {
          return engine.getClass().getPackage().getName().startsWith("org.bouncycastle.jsse.provider");
      }
  
      private BouncyCastle() {
      }
  }