| /* |
| * Copyright 2016 The Android Open Source Project |
| * |
| * Licensed 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 |
| * |
| * http://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 libcore.java.security; |
| |
| import java.io.BufferedReader; |
| import java.io.FileReader; |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| public class CpuFeatures { |
| private CpuFeatures() { |
| } |
| |
| public static boolean isAESHardwareAccelerated() { |
| List<String> features = getListFromCpuinfo("Features"); |
| if (features != null && features.contains("aes")) { |
| return true; |
| } |
| |
| List<String> flags = getListFromCpuinfo("flags"); |
| if (flags != null && flags.contains("aes")) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| private static String getFieldFromCpuinfo(String field) { |
| try { |
| BufferedReader br = new BufferedReader(new FileReader("/proc/cpuinfo")); |
| Pattern p = Pattern.compile(field + "\\s*:\\s*(.*)"); |
| |
| try { |
| String line; |
| while ((line = br.readLine()) != null) { |
| Matcher m = p.matcher(line); |
| if (m.matches()) { |
| return m.group(1); |
| } |
| } |
| } finally { |
| br.close(); |
| } |
| } catch (IOException ignored) { |
| } |
| |
| return null; |
| } |
| |
| private static List<String> getListFromCpuinfo(String fieldName) { |
| String features = getFieldFromCpuinfo(fieldName); |
| if (features == null) |
| return null; |
| |
| return Arrays.asList(features.split("\\s")); |
| } |
| } |