Kenny Root | 7e8a826 | 2016-03-18 15:01:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016 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.io.BufferedReader; |
| 20 | import java.io.FileReader; |
| 21 | import java.io.IOException; |
Kenny Root | 562ab6c | 2016-04-21 15:06:17 -0700 | [diff] [blame] | 22 | import java.lang.reflect.InvocationTargetException; |
| 23 | import java.lang.reflect.Method; |
Kenny Root | 7e8a826 | 2016-03-18 15:01:39 -0700 | [diff] [blame] | 24 | import java.util.Arrays; |
| 25 | import java.util.List; |
| 26 | import java.util.regex.Matcher; |
| 27 | import java.util.regex.Pattern; |
| 28 | |
Pete Bentley | 57580fe | 2018-10-04 14:47:44 +0100 | [diff] [blame] | 29 | import dalvik.system.VMRuntime; |
| 30 | |
Paul Duffin | 6e8778e | 2018-12-17 15:30:41 +0000 | [diff] [blame] | 31 | class CpuFeatures { |
Kenny Root | 7e8a826 | 2016-03-18 15:01:39 -0700 | [diff] [blame] | 32 | private CpuFeatures() { |
| 33 | } |
| 34 | |
Pete Bentley | 57580fe | 2018-10-04 14:47:44 +0100 | [diff] [blame] | 35 | static boolean isAESHardwareAccelerated() { |
| 36 | // Expectations based on CPU type: If these aren't met then Conscrypt |
| 37 | // integration tests will fail and the cause should be investigated. |
| 38 | String instructionSet = VMRuntime.getCurrentInstructionSet(); |
| 39 | if (instructionSet.startsWith("arm")) { |
| 40 | // All ARM CPUs with the "aes" feature should have hardware AES. |
| 41 | List<String> features = getListFromCpuinfo("Features"); |
| 42 | if (features != null && features.contains("aes")) { |
| 43 | return true; |
| 44 | } |
| 45 | } else if (instructionSet.startsWith("x86")) { |
| 46 | // x86 CPUs with the "aes" flag and running in 64bit mode should have hardware AES. |
| 47 | if (VMRuntime.is64BitInstructionSet(instructionSet)) { |
| 48 | List<String> flags = getListFromCpuinfo("flags"); |
| 49 | if (flags != null && flags.contains("aes")) { |
| 50 | return true; |
| 51 | } |
| 52 | } else { |
| 53 | // Hardware AES not supported in 32bit mode. |
| 54 | return false; |
| 55 | } |
Kenny Root | 7e8a826 | 2016-03-18 15:01:39 -0700 | [diff] [blame] | 56 | } |
| 57 | |
Pete Bentley | 57580fe | 2018-10-04 14:47:44 +0100 | [diff] [blame] | 58 | // Otherwise trust Conscrypt NativeCrypto's own checks, for example if we're in an |
| 59 | // emulated ABI, it might bridge to a library that has accelerated AES instructions. |
Kenny Root | 562ab6c | 2016-04-21 15:06:17 -0700 | [diff] [blame] | 60 | try { |
| 61 | Class<?> nativeCrypto = Class.forName("com.android.org.conscrypt.NativeCrypto"); |
| 62 | Method EVP_has_aes_hardware = nativeCrypto.getDeclaredMethod("EVP_has_aes_hardware"); |
Adam Vartanian | 8a2d334 | 2017-08-11 10:06:52 +0100 | [diff] [blame] | 63 | EVP_has_aes_hardware.setAccessible(true); |
Kenny Root | 562ab6c | 2016-04-21 15:06:17 -0700 | [diff] [blame] | 64 | return ((Integer) EVP_has_aes_hardware.invoke(null)) == 1; |
| 65 | } catch (ClassNotFoundException | NoSuchMethodException | SecurityException |
| 66 | | IllegalAccessException | IllegalArgumentException ignored) { |
| 67 | } catch (InvocationTargetException e) { |
| 68 | throw new IllegalArgumentException(e); |
| 69 | } |
| 70 | |
Kenny Root | 7e8a826 | 2016-03-18 15:01:39 -0700 | [diff] [blame] | 71 | return false; |
| 72 | } |
| 73 | |
| 74 | private static String getFieldFromCpuinfo(String field) { |
| 75 | try { |
| 76 | BufferedReader br = new BufferedReader(new FileReader("/proc/cpuinfo")); |
| 77 | Pattern p = Pattern.compile(field + "\\s*:\\s*(.*)"); |
| 78 | |
| 79 | try { |
| 80 | String line; |
| 81 | while ((line = br.readLine()) != null) { |
| 82 | Matcher m = p.matcher(line); |
| 83 | if (m.matches()) { |
| 84 | return m.group(1); |
| 85 | } |
| 86 | } |
| 87 | } finally { |
| 88 | br.close(); |
| 89 | } |
| 90 | } catch (IOException ignored) { |
| 91 | } |
| 92 | |
| 93 | return null; |
| 94 | } |
| 95 | |
| 96 | private static List<String> getListFromCpuinfo(String fieldName) { |
| 97 | String features = getFieldFromCpuinfo(fieldName); |
| 98 | if (features == null) |
| 99 | return null; |
| 100 | |
| 101 | return Arrays.asList(features.split("\\s")); |
| 102 | } |
| 103 | } |