1 /*
2  * Copyright (C) 2017 The Android Open Source Project
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 libcore.java.security;
18 
19 import java.security.Provider;
20 import java.security.Security;
21 import java.util.HashSet;
22 import java.util.Locale;
23 import java.util.Set;
24 import java.util.SortedSet;
25 import java.util.TreeSet;
26 
27 /**
28  * Prints a list of all algorithms (including aliases) that overlap between Conscrypt and
29  * Bouncy Castle.  Intended to be run via vogar.
30  * <p>
31  * {@code vogar libcore/tools/crypto/src/java/libcore/java/security/ProviderOverlap.java}
32  */
33 public class ProviderOverlap {
34 
main(String[] argv)35     public static void main(String[] argv) throws Exception {
36         Set<String> conscrypt = getAlgorithms(Security.getProvider("AndroidOpenSSL"));
37         Set<String> bc = getAlgorithms(Security.getProvider("BC"));
38         SortedSet<String> overlap = new TreeSet<>(conscrypt);
39         overlap.retainAll(bc);
40         for (String s : overlap) {
41             System.out.println(s);
42         }
43     }
44 
getAlgorithms(Provider p)45     private static Set<String> getAlgorithms(Provider p) {
46         Set<String> result = new HashSet<>();
47         for (Object keyObj : p.keySet()) {
48             String key = (String) keyObj;
49             if (key.contains(" ")) {
50                 // These are implementation properties like "Provider.id name"
51                 continue;
52             }
53             if (key.startsWith("Alg.Alias.")) {
54                 // This is an alias, strip its prefix
55                 key = key.substring("Alg.Alias.".length());
56             }
57             result.add(key.toUpperCase(Locale.US));
58         }
59         return result;
60     }
61 }