1 /* 2 * Copyright (C) 2019 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 android.car.encryptionrunner; 18 19 import android.annotation.IntDef; 20 21 import com.android.internal.annotations.VisibleForTesting; 22 23 /** 24 * Factory that creates encryption runner. 25 */ 26 public class EncryptionRunnerFactory { 27 EncryptionRunnerFactory()28 private EncryptionRunnerFactory() { 29 // prevent instantiation. 30 } 31 32 @IntDef({EncryptionRunnerType.UKEY2, EncryptionRunnerType.OOB_UKEY2}) 33 public @interface EncryptionRunnerType { 34 /** Use Ukey2 as underlying key exchange. */ 35 int UKEY2 = 0; 36 /** Use Ukey2 and an out of band channel as underlying key exchange. */ 37 int OOB_UKEY2 = 1; 38 } 39 40 /** 41 * Creates a new {@link EncryptionRunner} based on {@param type}. 42 */ newRunner(@ncryptionRunnerType int type)43 public static EncryptionRunner newRunner(@EncryptionRunnerType int type) { 44 switch (type) { 45 case EncryptionRunnerType.UKEY2: 46 return new Ukey2EncryptionRunner(); 47 case EncryptionRunnerType.OOB_UKEY2: 48 return new OobUkey2EncryptionRunner(); 49 default: 50 throw new IllegalArgumentException("Unknown EncryptionRunnerType: " + type); 51 } 52 } 53 54 /** 55 * Creates a new {@link EncryptionRunner}. 56 * 57 * @deprecated Use {@link #newRunner(int)} instead. 58 */ 59 @Deprecated newRunner()60 public static EncryptionRunner newRunner() { 61 return newRunner(EncryptionRunnerType.UKEY2); 62 } 63 64 /** 65 * Creates a new {@link EncryptionRunner} one that doesn't actually do encryption but is useful 66 * for testing. 67 */ 68 @VisibleForTesting newDummyRunner()69 public static EncryptionRunner newDummyRunner() { 70 return new DummyEncryptionRunner(); 71 } 72 } 73