| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.util; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.regex.Pattern; |
| |
| /** |
| * The class decomposes standard algorithms into sub-elements. |
| */ |
| public class AlgorithmDecomposer { |
| |
| private static final Pattern transPattern = Pattern.compile("/"); |
| private static final Pattern pattern = |
| Pattern.compile("with|and", Pattern.CASE_INSENSITIVE); |
| |
| /** |
| * Decompose the standard algorithm name into sub-elements. |
| * <p> |
| * For example, we need to decompose "SHA1WithRSA" into "SHA1" and "RSA" |
| * so that we can check the "SHA1" and "RSA" algorithm constraints |
| * separately. |
| * <p> |
| * Please override the method if need to support more name pattern. |
| */ |
| public Set<String> decompose(String algorithm) { |
| if (algorithm == null || algorithm.length() == 0) { |
| return new HashSet<>(); |
| } |
| |
| // algorithm/mode/padding |
| String[] transTockens = transPattern.split(algorithm); |
| |
| Set<String> elements = new HashSet<>(); |
| for (String transTocken : transTockens) { |
| if (transTocken == null || transTocken.length() == 0) { |
| continue; |
| } |
| |
| // PBEWith<digest>And<encryption> |
| // PBEWith<prf>And<encryption> |
| // OAEPWith<digest>And<mgf>Padding |
| // <digest>with<encryption> |
| // <digest>with<encryption>and<mgf> |
| String[] tokens = pattern.split(transTocken); |
| |
| for (String token : tokens) { |
| if (token == null || token.length() == 0) { |
| continue; |
| } |
| |
| elements.add(token); |
| } |
| } |
| |
| // In Java standard algorithm name specification, for different |
| // purpose, the SHA-1 and SHA-2 algorithm names are different. For |
| // example, for MessageDigest, the standard name is "SHA-256", while |
| // for Signature, the digest algorithm component is "SHA256" for |
| // signature algorithm "SHA256withRSA". So we need to check both |
| // "SHA-256" and "SHA256" to make the right constraint checking. |
| |
| // handle special name: SHA-1 and SHA1 |
| if (elements.contains("SHA1") && !elements.contains("SHA-1")) { |
| elements.add("SHA-1"); |
| } |
| if (elements.contains("SHA-1") && !elements.contains("SHA1")) { |
| elements.add("SHA1"); |
| } |
| |
| // handle special name: SHA-224 and SHA224 |
| if (elements.contains("SHA224") && !elements.contains("SHA-224")) { |
| elements.add("SHA-224"); |
| } |
| if (elements.contains("SHA-224") && !elements.contains("SHA224")) { |
| elements.add("SHA224"); |
| } |
| |
| // handle special name: SHA-256 and SHA256 |
| if (elements.contains("SHA256") && !elements.contains("SHA-256")) { |
| elements.add("SHA-256"); |
| } |
| if (elements.contains("SHA-256") && !elements.contains("SHA256")) { |
| elements.add("SHA256"); |
| } |
| |
| // handle special name: SHA-384 and SHA384 |
| if (elements.contains("SHA384") && !elements.contains("SHA-384")) { |
| elements.add("SHA-384"); |
| } |
| if (elements.contains("SHA-384") && !elements.contains("SHA384")) { |
| elements.add("SHA384"); |
| } |
| |
| // handle special name: SHA-512 and SHA512 |
| if (elements.contains("SHA512") && !elements.contains("SHA-512")) { |
| elements.add("SHA-512"); |
| } |
| if (elements.contains("SHA-512") && !elements.contains("SHA512")) { |
| elements.add("SHA512"); |
| } |
| |
| return elements; |
| } |
| |
| } |