| /* |
| * Copyright (C) 2018 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 com.android.server.backup.testing; |
| |
| import java.security.NoSuchAlgorithmException; |
| import java.util.Random; |
| |
| import javax.crypto.KeyGenerator; |
| import javax.crypto.SecretKey; |
| |
| /** Helpers for crypto code tests. */ |
| public class CryptoTestUtils { |
| private static final String KEY_ALGORITHM = "AES"; |
| private static final int KEY_SIZE_BITS = 256; |
| |
| private CryptoTestUtils() {} |
| |
| public static SecretKey generateAesKey() throws NoSuchAlgorithmException { |
| KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_ALGORITHM); |
| keyGenerator.init(KEY_SIZE_BITS); |
| return keyGenerator.generateKey(); |
| } |
| |
| /** Generates a byte array of size {@code n} containing random bytes. */ |
| public static byte[] generateRandomBytes(int n) { |
| byte[] bytes = new byte[n]; |
| Random random = new Random(); |
| random.nextBytes(bytes); |
| return bytes; |
| } |
| } |