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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 java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Convert java naming to OpenSSL naming if possible and if not return the original name.
   */
  final class GroupsConverter {
  
      private static final Map<String, String> mappings;
  
      static {
          // See https://tools.ietf.org/search/rfc4492#appendix-A and https://www.java.com/en/configure_crypto.html
          Map<String, String> map = new HashMap<String, String>();
          map.put("secp224r1", "P-224");
          map.put("prime256v1", "P-256");
          map.put("secp256r1", "P-256");
          map.put("secp384r1", "P-384");
          map.put("secp521r1", "P-521");
          map.put("x25519", "X25519");
          mappings = Collections.unmodifiableMap(map);
      }
  
      static String toOpenSsl(String key) {
          String mapping = mappings.get(key);
          if (mapping == null) {
              return key;
          }
          return mapping;
      }
  
      private GroupsConverter() { }
  }