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1   /*
2    * Copyright 2021 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://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, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty5.handler.ssl;
17  
18  import java.util.Collections;
19  import java.util.HashMap;
20  import java.util.Map;
21  
22  /**
23   * Convert java naming to OpenSSL naming if possible and if not return the original name.
24   */
25  final class GroupsConverter {
26  
27      private static final Map<String, String> mappings;
28  
29      static {
30          // See https://tools.ietf.org/search/rfc4492#appendix-A and https://www.java.com/en/configure_crypto.html
31          Map<String, String> map = new HashMap<>();
32          map.put("secp224r1", "P-224");
33          map.put("prime256v1", "P-256");
34          map.put("secp256r1", "P-256");
35          map.put("secp384r1", "P-384");
36          map.put("secp521r1", "P-521");
37          map.put("x25519", "X25519");
38          mappings = Collections.unmodifiableMap(map);
39      }
40  
41      static String toOpenSsl(String key) {
42          String mapping = mappings.get(key);
43          if (mapping == null) {
44              return key;
45          }
46          return mapping;
47      }
48  
49      private GroupsConverter() { }
50  }